Publications by authors named "Satoshi Ueha"

79 Publications

Interleukin-11-expressing fibroblasts have a unique gene signature correlated with poor prognosis of colorectal cancer.

Nat Commun 2021 04 16;12(1):2281. Epub 2021 Apr 16.

Department of Biochemistry, Toho University School of Medicine, Tokyo, Japan.

Interleukin (IL)-11 is a member of the IL-6 family of cytokines and is involved in multiple cellular responses, including tumor development. However, the origin and functions of IL-11-producing (IL-11) cells are not fully understood. To characterize IL-11 cells in vivo, we generate Il11 reporter mice. IL-11 cells appear in the colon in murine tumor and acute colitis models. Il11ra1 or Il11 deletion attenuates the development of colitis-associated colorectal cancer. IL-11 cells express fibroblast markers and genes associated with cell proliferation and tissue repair. IL-11 induces the activation of colonic fibroblasts and epithelial cells through phosphorylation of STAT3. Human cancer database analysis reveals that the expression of genes enriched in IL-11 fibroblasts is elevated in human colorectal cancer and correlated with reduced recurrence-free survival. IL-11 fibroblasts activate both tumor cells and fibroblasts via secretion of IL-11, thereby constituting a feed-forward loop between tumor cells and fibroblasts in the tumor microenvironment.
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http://dx.doi.org/10.1038/s41467-021-22450-3DOI Listing
April 2021

Transient Depletion of CD4 Cells Induces Remodeling of the TCR Repertoire in Gastrointestinal Cancer.

Cancer Immunol Res 2021 Mar 5. Epub 2021 Mar 5.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Antibody-mediated transient depletion of CD4 cells enhances the expansion of tumor-reactive CD8 T cells and exhibits robust antitumor effects in preclinical and clinical studies. To investigate the clonal T-cell responses following transient CD4 cell depletion in patients with cancer, we conducted a temporal analysis of the T-cell receptor (TCR) repertoire in the first-in-human clinical trial of IT1208, a defucosylated humanized monoclonal anti-CD4. Transient depletion of CD4 cells promoted replacement of T-cell clones among CD4 and CD8 T cells in the blood. This replacement of the TCR repertoire was associated with the extent of CD4 T-cell depletion and an increase in CD8 T-cell count in the blood. Next, we focused on T-cell clones overlapping between the blood and tumor in order to track tumor-associated T-cell clones in the blood. The total frequency of blood-tumor overlapping clones tended to increase in patients receiving a depleting dose of anti-CD4, which was accompanied by the replacement of overlapping clones. The greater expansion of CD8 overlapping clones was commonly observed in the patients who achieved tumor shrinkage. These results suggested that the clonal replacement of the TCR repertoire induced by transient CD4 cell depletion was accompanied by the expansion of tumor-reactive T-cell clones that mediated antitumor responses. Our findings propose beneficial remodeling of the TCR repertoire following transient CD4 cell depletion and provide novel insight into the antitumor effects of monoclonal anti-CD4 treatment in patients with cancer.
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http://dx.doi.org/10.1158/2326-6066.CIR-20-0989DOI Listing
March 2021

Suppression of liver transplant rejection by anti-donor MHC antibodies via depletion of donor immunogenic dendritic cells.

Int Immunol 2021 Apr;33(5):261-272

Department of Anatomy (Macro), Dokkyo Medical University, Tochigi, Japan.

Background: We previously found two distinct passenger dendritic cell (DC) subsets in the rat liver that played a central role in the liver transplant rejection. In addition, a tolerance-inducing protocol, donor-specific transfusion (DST), triggered systemic polytopical production of depleting alloantibodies to donor class I MHC (MHCI) antigen (DST-antibodies).

Methods: We examined the role of DST-antibodies in the trafficking of graft DC subsets and the alloresponses in a rat model. We also examined an anti-donor class II MHC (MHCII) antibody that recognizes donor DCs more selectively.

Results: Preoperative transfer of DST-antibodies or DST pretreatment eliminated all passenger leukocytes, including both DC subsets and depleted the sessile DCs in the graft to ~20% of control. The CD172a+CD11b/c+ immunogenic subset was almost abolished. The intrahost direct or semi-direct allorecognition pathway was successfully blocked, leading to a significant suppression of the CD8+ T-cell response in the recipient lymphoid organs and the graft with delayed graft rejection. Anti-donor MHCII antibody had similar effects without temporary graft damage. Although DST pretreatment had a priming effect on the proliferative response of recipient regulatory T cells, DST-primed sera and the anti-donor MHCII antibody did not.

Conclusion: DST-antibodies and anti-donor MHCII antibodies could suppress the CD8+ T-cell-mediated liver transplant rejection by depleting donor immunogenic DCs, blocking the direct or semi-direct pathways of allorecognition. Donor MHCII-specific antibodies may be applicable as a selective suppressant of anti-donor immunity for clinical liver transplantation without the cellular damage of donor MHCII- graft cells and recipient cells.
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http://dx.doi.org/10.1093/intimm/dxaa076DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8060989PMC
April 2021

Generation of a p16 Reporter Mouse and Its Use to Characterize and Target p16 Cells In Vivo.

Cell Metab 2020 11 18;32(5):814-828.e6. Epub 2020 Sep 18.

Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan.

Cell senescence plays a key role in age-associated organ dysfunction, but the in vivo pathogenesis is largely unclear. Here, we generated a p16-Cre-tdTomato mouse model to analyze the in vivo characteristics of p16 cells at a single-cell level. We found tdTomato-positive p16 cells detectable in all organs, which were enriched with age. We also found that these cells failed to proliferate and had half-lives ranging from 2.6 to 4.2 months, depending on the tissue examined. Single-cell transcriptomics in the liver and kidneys revealed that p16 cells were present in various cell types, though most dominant in hepatic endothelium and in renal proximal and distal tubule epithelia, and that these cells exhibited heterogeneous senescence-associated phenotypes. Further, elimination of p16 cells ameliorated nonalcoholic steatohepatitis-related hepatic lipidosis and immune cell infiltration. Our new mouse model and single-cell analysis provide a powerful resource to enable the discovery of previously unidentified senescence functions in vivo.
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http://dx.doi.org/10.1016/j.cmet.2020.09.006DOI Listing
November 2020

Effects of Cigarette Smoke on the Nasal Respiratory and Olfactory Mucosa in Allergic Rhinitis Mice.

Front Neurosci 2020 18;14:126. Epub 2020 Feb 18.

Department of Otolaryngology, The University of Tokyo, Tokyo, Japan.

Objective: Cigarette smoke (CS) exposure reportedly enhances allergic airway inflammation. However, some studies have shown an association between current cigarette smoke exposure and a low risk for allergic rhinitis. Thus, the impact of CS exposure on allergic rhinitis remains poorly understood. The purpose of this study was to investigate the effects of CS on the respiratory mucosa (RM) and the olfactory epithelium (OE) of mice with allergic rhinitis, as the effects may differ depending on the nasal histological compartments.

Methods: Eight-week-old male BALB/c mice were used for this study. We developed a mouse model of smoking by intranasally administering 10 doses of a CS solution (CSS), and a mouse model of allergic rhinitis by sensitization with intraperitoneal ovalbumin (OVA) injection and intranasal challenge with OVA. We examined the effects of CS on the nasal RM and OE in mice with or without allergic rhinitis using histological, serum, and genetic analyses. First, we examine whether CSS exposure induces allergic responses and then, examined allergic responses in the OVA-sensitized allergic rhinitis mice with or without CSS exposure.

Results: Short-term CSS administration intensified allergic responses including increased infiltration of eosinophils and inflammatory cells and upregulation of interleukin-5 expression in the nasal RM of OVA-immunized mice, although only CSS induced neither allergic responses nor impairment of the RM and OE. Notably, repetitive OVA-immunization partially impaired the OE in the upper-lateral area, but CSS administration did not reinforce this impairment in OVA-induced allergic mice.

Conclusion: Short-term CSS exposure strengthened allergic responses in the nasal RM and did not change the structure of the OE. These results suggest that patients with allergic rhinitis could experience exacerbation of allergic symptoms after CS exposure.
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http://dx.doi.org/10.3389/fnins.2020.00126DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040099PMC
February 2020

The increased frequency of methicillin-resistant Staphylococcus aureus with low MIC of beta-lactam antibiotics isolated from hospitalized patients.

J Infect Chemother 2020 Jun 22;26(6):604-610. Epub 2020 Feb 22.

Department of Nephrology and Laboratory Medicine, Division of Blood Purification, Kanazawa University, Kanazawa, Japan.

Methicillin-resistant Staphylococcus aureus (MRSA) causes severe infectious diseases and can be life-threatening in healthcare-settings. MRSA is classified into health-care associated (HA)-MRSA strains and community acquired (CA)-MRSA strains based on genotype and phenotype. CA-MRSA has been reported to show the lower minimal inhibitory concentration (MIC) of some antibiotics as compared to HA-MRSA. Recently, the prevalence of CA-MRSA has been increased in worldwide. CA-MRSA is isolated not only from the healthy individuals in a community but also from the patients in healthcare settings. However, the changing trend in frequency of HA-MRSA and CA-MRSA in the hospital setting is not clear. Therefore, we analyzed the trend of MIC to speculate the frequency of HA-MRSA and CA-MRSA in the facility. Moreover, gene mutations were evaluated on resistant gene loci with next generation sequencer. The frequency of strains with low MIC of beta-lactam antibiotics was gradually increased in isolated MRSA strains from the hospitalized patients. Whole genome analysis revealed the frequency of gene mutation was also decreased in some resistant loci, such as blaZ and blaR1. These findings highlight the changing trend of MRSA strains isolated from hospitalized patients.
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http://dx.doi.org/10.1016/j.jiac.2020.01.016DOI Listing
June 2020

Collagen adhesion gene is associated with bloodstream infections caused by methicillin-resistant Staphylococcus aureus.

Int J Infect Dis 2020 Feb 15;91:22-31. Epub 2019 Nov 15.

Department of Molecular Preventive Medicine, University of Tokyo, Tokyo, Japan; Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, Noda, Japan.

Objectives: Methicillin-resistant Staphylococcus aureus (MRSA) causes hospital- and community-acquired infections. It is not clear whether genetic characteristics of the bacteria contribute to disease pathogenesis in MRSA infection. We hypothesized that whole genome analysis of MRSA strains could reveal the key gene loci and/or the gene mutations that affect clinical manifestations of MRSA infection.

Methods: Whole genome sequences (WGS) of MRSA of 154 strains were analyzed with respect to clinical manifestations and data. Further, we evaluated the association between clinical manifestations in MRSA infection and genomic information.

Results: WGS revealed gene mutations that correlated with clinical manifestations of MRSA infection. Moreover, 12 mutations were selected as important mutations by Random Forest analysis. Cluster analysis revealed strains associated with a high frequency of bloodstream infection (BSI). Twenty seven out of 34 strains in this cluster caused BSI. These strains were all positive for collagen adhesion gene (cna) and have mutations in the locus, those were selected by Random Forest analysis. Univariate and multivariate analysis revealed that these gene mutations were the predictor for the incidence of BSI. Interestingly, mutant CNA protein showed lower attachment ability to collagen, suggesting that the mutant protein might contribute to the dissemination of bacteria.

Conclusions: These findings suggest that the bacterial genotype affects the clinical characteristics of MRSA infection.
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http://dx.doi.org/10.1016/j.ijid.2019.11.003DOI Listing
February 2020

Pulmonary monocytes interact with effector T cells in the lung tissue to drive T differentiation following viral infection.

Mucosal Immunol 2020 01 13;13(1):161-171. Epub 2019 Nov 13.

Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA, 30322, USA.

Lung resident memory CD8 T cells (T) are critical for protection against respiratory viruses, but the cellular interactions required for their development are poorly understood. Herein we describe the necessity of classical monocytes for the establishment of lung T following influenza infection. We find that, during the initial appearance of lung T, monocytes and dendritic cells are the most numerous influenza antigen-bearing APCs in the lung. Surprisingly, depletion of DCs after initial T cell priming did not impact lung T development or maintenance. In contrast, a monocyte deficient pulmonary environment in CCR2 mice results in significantly less lung T following influenza infection, despite no defect in the antiviral effector response or in the peripheral memory pool. Imaging shows direct interaction of antigen-specific T cells with antigen-bearing monocytes in the lung, and pulmonary classical monocytes from the lungs of influenza infected mice are sufficient to drive differentiation of T cells in vitro. These data describe a novel role for pulmonary monocytes in mediating lung T development through direct interaction with T cells in the lung.
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http://dx.doi.org/10.1038/s41385-019-0224-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6917844PMC
January 2020

CXCR6 regulates localization of tissue-resident memory CD8 T cells to the airways.

J Exp Med 2019 12 26;216(12):2748-2762. Epub 2019 Sep 26.

Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA

Resident memory T cells (T cells) are an important first-line defense against respiratory pathogens, but the unique contributions of lung T cell populations to protective immunity and the factors that govern their localization to different compartments of the lung are not well understood. Here, we show that airway and interstitial T cells have distinct effector functions and that CXCR6 controls the partitioning of T cells within the lung by recruiting CD8 T cells to the airways. The absence of CXCR6 significantly decreases airway CD8 T cells due to altered trafficking of CXCR6 cells within the lung, and not decreased survival in the airways. CXCL16, the ligand for CXCR6, is localized primarily at the respiratory epithelium, and mice lacking CXCL16 also had decreased CD8 T cells in the airways. Finally, blocking CXCL16 inhibited the steady-state maintenance of airway T cells. Thus, the CXCR6/CXCL16 signaling axis controls the localization of T cells to different compartments of the lung and maintains airway T cells.
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http://dx.doi.org/10.1084/jem.20181308DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6888981PMC
December 2019

Interstitial-resident memory CD8 T cells sustain frontline epithelial memory in the lung.

J Exp Med 2019 12 26;216(12):2736-2747. Epub 2019 Sep 26.

Department of Immunology, Kindai University Faculty of Medicine, Osaka, Japan.

Populations of CD8 lung-resident memory T (T) cells persist in the interstitium and epithelium (airways) following recovery from respiratory virus infections. While it is clear that CD8 T cells in the airways are dynamically maintained via the continuous recruitment of new cells, there is a vigorous debate about whether tissue-circulating effector memory T (T) cells are the source of these newly recruited cells. Here we definitively demonstrate that CD8 T cells in the lung airways are not derived from T cells in the circulation, but are seeded continuously by T cells from the lung interstitium. This process is driven by CXCR6 that is expressed uniquely on T cells but not T cells. We further demonstrate that the lung interstitium CD8 T cell population is also maintained independently of T cells via a homeostatic proliferation mechanism. Taken together, these data show that lung memory CD8 T cells in the lung interstitium and airways are compartmentally separated from T cells and clarify the mechanisms underlying their maintenance.
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http://dx.doi.org/10.1084/jem.20190557DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6888985PMC
December 2019

First-in-human phase 1 study of IT1208, a defucosylated humanized anti-CD4 depleting antibody, in patients with advanced solid tumors.

J Immunother Cancer 2019 07 24;7(1):195. Epub 2019 Jul 24.

Department of Experimental Therapeutics, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan.

Background: Transient CD4 T cell depletion led to the proliferation of tumor-specific CD8 T cells in the draining lymph node and increased infiltration of PD-1CD8 T cells into the tumor, which resulted in strong anti-tumor effects in tumor-bearing mice. This is a first-in-human study of IT1208, a defucosylated humanized anti-CD4 monoclonal antibody, engineered to exert potent antibody-dependent cellular cytotoxicity.

Methods: Patients with advanced solid tumors were treated with intravenous IT1208 at doses of 0.1 or 1.0 mg/kg. The first patient in each cohort received a single administration, and the other patients received two administrations of IT1208 on days 1 and 8.

Results: Eleven patients were enrolled in the 0.1 mg/kg (n = 4) and 1.0 mg/kg cohorts (n = 7). Grade 1 or 2 infusion-related reactions was observed in all patients. Decreased CD4 T cells in peripheral blood due to IT1208 were observed in all patients and especially in those receiving two administrations of 1.0 mg/kg. CD8 T cells increased on day 29 compared with baseline in most patients, resulting in remarkably decreased CD4/8 ratios. One microsatellite-stable colon cancer patient achieved durable partial response showing increased infiltration of both CD4 and CD8 T cells into tumors after IT1208 administration. Moreover, transcriptomic profiling of the liver metastasis of the patient revealed upregulation of the expression of interferon-stimulated genes, T cell activation-related genes, and antigen presentation-related genes after IT1208 administration. Two additional patients with gastric or esophageal cancer achieved stable disease lasting at least 3 months.

Conclusions: IT1208 monotherapy successfully depleted CD4 T cells with a manageable safety profile and encouraging preliminary efficacy signals, which warrants further investigations, especially in combination with immune checkpoint inhibitors.
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http://dx.doi.org/10.1186/s40425-019-0677-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6657210PMC
July 2019

Novel Targeting to XCR1 Dendritic Cells Using Allogeneic T Cells for Polytopical Antibody Responses in the Lymph Nodes.

Front Immunol 2019 29;10:1195. Epub 2019 May 29.

Department of Anatomy (Macro), School of Medicine, Dokkyo Medical University, Tochigi, Japan.

Vaccination strategy that induce efficient antibody responses polytopically in most lymph nodes (LNs) against infections has not been established yet. Because donor-specific blood transfusion induces anti-donor class I MHC antibody production in splenectomized rats, we examined the mechanism and significance of this response. Among the donor blood components, T cells were the most efficient immunogens, inducing recipient T cell and B cell proliferative responses not only in the spleen, but also in the peripheral and gut LNs. Donor T cells soon migrated to the splenic T cell area and the LNs, with a temporary significant increase in recipient NK cells. XCR1 resident dendritic cells (DCs), but not XCR1 DCs, selectively phagocytosed donor class I MHC fragments after 1 day. After 1.5 days, both DC subsets formed clusters with recipient CD4 T cells, which proliferated within these clusters. Inhibition of donor T cell migration or depletion of NK cells by pretreatment with pertussis toxin or anti-asialoGM antibody, respectively, significantly suppressed DC phagocytosis and subsequent immune responses. Three allogeneic strains with different NK activities had the same response but with different intensity. Donor T cell proliferation was not required, indicating that the graft vs. host reaction is dispensable. Intravenous transfer of antigen-labeled and mitotic inhibitor-treated allogeneic, but not syngeneic, T cells induced a polytopical antibody response to labeled antigens in the LNs of splenectomized rats. These results demonstrate a novel mechanism of alloresponses polytopically in the secondary lymphoid organs (SLOs) induced by allogeneic T cells. Donor T cells behave as self-migratory antigen ferries to be delivered to resident XCR1 DCs with negligible commitment of migratory DCs. Allogeneic T cells may be clinically applicable as vaccine vectors for polytopical prophylactic antibody production even in asplenic or hyposplenic individuals.
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http://dx.doi.org/10.3389/fimmu.2019.01195DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6548820PMC
July 2020

In vitro expansion of endogenous human alveolar epithelial type II cells in fibroblast-free spheroid culture.

Biochem Biophys Res Commun 2019 08 6;515(4):579-585. Epub 2019 Jun 6.

Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, Noda, 278-0022, Japan. Electronic address:

Alveolar epithelial type II cells (AEC2) are stem cells of the alveoli and play crucial roles in maintaining lung homeostasis and the pathogenesis of lung diseases. We recently reported on an organoid culture system for endogenous murine AEC2. Despite advances in generation of human induced pluripotent stem cell-derived AEC2, in vitro expansion of endogenous human AEC2 has not been reported and genetic manipulation of human AEC2 has been difficult. Here, we show that endogenous human AEC2 could be cultured and passaged using a three-dimensional culture system with a specific combination of signal ligands and inhibitors. The culture system was suitable for retroviral gene transduction into AEC2. Transduction of pulmonary fibrosis-associated mutant surfactant protein C (SFPTC) into AEC2 revealed characteristic transcriptional traits similar to those of patients with idiopathic pulmonary fibrosis. Our culture system will be a useful tool for investigating human AEC2 functions in vitro.
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http://dx.doi.org/10.1016/j.bbrc.2019.05.187DOI Listing
August 2019

Gli signaling pathway modulates fibroblast activation and facilitates scar formation in pulmonary fibrosis.

Biochem Biophys Res Commun 2019 06 8;514(3):684-690. Epub 2019 May 8.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, Noda, Japan; Japan Agency for Medical Research and Development-CREST Program, Tokyo, Japan. Electronic address:

Pulmonary fibrosis is characterized by progressive and irreversible scarring of alveoli, which causes reduction of surface epithelial area and eventually respiratory failure. The precise mechanism of alveolar scarring is poorly understood. In this study, we explored transcriptional signatures of activated fibroblasts in alveolar airspaces by using intratracheal transfer in bleomycin-induced lung fibrosis. Lung fibroblasts transferred into injured alveoli upregulated genes related to translation and metabolism in the first two days, and upregulated genes related to extracellular matrix (ECM) production between day 2 and 7. Upstream analysis of these upregulated genes suggested possible contribution of hypoxia-inducible factors 1a (Hif1a) to fibroblast activation in the first two days, and possible contribution of kruppel-like factor 4 (Klf4) and glioma-associated oncogene (Gli) transcription factors to fibroblast activation in the following profibrotic phase. Fibroblasts purified based on high Acta2 expression after intratracheal transfer were also characterized by ECM production and upstream regulation by Klf4 and Gli proteins. Pharmacological inhibition of Gli proteins by GANT61 in bleomycin-induced lung fibrosis altered the pattern of scarring characterized by dilated airspaces and smaller fibroblast clusters. Activated fibroblasts isolated from GANT61-treated mice showed decreased migration capacity, suggesting that Gli signaling inhibition attenuated fibroblast activation. In conclusion, we revealed transcriptional signatures and possible upstream regulators of activated fibroblasts in injured alveolar airspaces. The altered scar formation by Gli signaling inhibition supports that activated fibroblasts in alveolar airspaces may play a critical role in scar formation.
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http://dx.doi.org/10.1016/j.bbrc.2019.05.011DOI Listing
June 2019

Engraftment and proliferation potential of embryonic lung tissue cells in irradiated mice with emphysema.

Sci Rep 2019 03 6;9(1):3657. Epub 2019 Mar 6.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-0033, Japan.

Recently, there has been increasing interest in stem cell transplantation therapy, to treat chronic respiratory diseases, using lung epithelial cells or alveolospheres derived from endogenous lung progenitor cells. However, optimal transplantation strategy of these cells has not been addressed. To gain insight into the optimization of stem cell transplantation therapy, we investigated whether lung cell engraftment potential differ among different developmental stages. After preconditioning with irradiation and elastase to induce lung damage, we infused embryonic day 15.5 (E15.5) CAG-EGFP whole lung cells, and confirmed the engraftment of epithelial cells, endothelial cells, and mesenchymal cells. The number of EGFP-positive epithelial cells increased from day 7 to 28 after infusion. Among epithelial cells derived from E13.5, E15.5, E18.5, P7, P14, and P56 mice, E15.5 cells demonstrated the most efficient engraftment. In vitro, E15.5 epithelial cells showed high proliferation potential. Transcriptome analyses of sorted epithelial cells from E13.5, E15.5, E18.5, P14, and P56 mice revealed that cell cycle and cell-cell adhesion genes were highly enriched in E15.5 epithelial cells. Our findings suggest that cell therapy for lung diseases might be most effective when epithelial cells with transcriptional traits similar to those of E15.5 epithelial cells are used.
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http://dx.doi.org/10.1038/s41598-019-40237-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403395PMC
March 2019

TCR Repertoire Analysis Reveals Mobilization of Novel CD8 T Cell Clones Into the Cancer-Immunity Cycle Following Anti-CD4 Antibody Administration.

Front Immunol 2018 24;9:3185. Epub 2019 Jan 24.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Depletion of CD4 cells using an anti-CD4 monoclonal antibody (anti-CD4 mAb) induces the expansion of tumor-reactive CD8 T cells and strong antitumor effects in several murine tumor models. However, it is not known whether the anti-CD4 mAb treatment activates a particular or a broad spectrum of tumor-reactive CD8 T cell clones. To investigate the changes in the TCR repertoire induced by the anti-CD4 mAb treatment, we performed unbiased high-throughput TCR sequencing in a B16F10 mouse subcutaneous melanoma model. By Inter-Organ Clone Tracking analysis, we demonstrated that anti-CD4 mAb treatment increased the diversity and combined frequency of CD8 T cell clones that overlapped among the tumor, draining lymph node (dLN), and peripheral blood repertoires. Interestingly, the anti-CD4 mAb treatment-induced expansion of overlapping clones occurred mainly in the dLN rather than in the tumor. Overall, the Inter-Organ Clone Tracking analysis revealed that anti-CD4 mAb treatment enhances the mobilization of a wide variety of tumor-reactive CD8 T cell clones into the Cancer-Immunity Cycle and thus induces a robust antitumor immune response in mice.
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http://dx.doi.org/10.3389/fimmu.2018.03185DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353793PMC
October 2019

Combined treatment with HMGN1 and anti-CD4 depleting antibody reverses T cell exhaustion and exerts robust anti-tumor effects in mice.

J Immunother Cancer 2019 01 29;7(1):21. Epub 2019 Jan 29.

Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba, Japan.

Background: Transient depletion of CD4 T cells results in tumor suppression and survival benefit in murine models; however, the tumor progression and recurrence still occur over more long-term monitoring of mice. Thus, we explored an additional strategy to enhance endogenous immune responses by an alarmin, high mobility group nucleosome binding protein 1 (HMGN1).

Methods: The anti-tumor effects of HMGN1, anti-CD4 depleting antibody, and their combined treatment were monitored in the Colon26 or the B16F10 subcutaneous murine models. The tumor-infiltrating CD8 T cell proliferation, differentiation, exhaustion, and its gene expression were determined by flow cytometry, transcriptome analysis, and quantitative real-time PCR.

Results: Our results show that a systemic administration of low doses of HMGN1 with an anti-CD4 depleting antibody (HMGN1/αCD4) promoted expansion of CD8 T cell populations (e.g. CD137 PD-1 and CD44 PD-1), recruited CCR7 migratory dendritic cells to the tumor, and reduced co-inhibitory molecules (e.g. PD-1, LAG-3, and TIM-3) to counteract CD8 T cell exhaustion.

Conclusion: The HMGN1/αCD4 treatment expanded effector CD8 T cells and prolonged their anti-tumor activities by rescuing them from exhaustion, thus resulting in tumor regression and even rejection in long-term monitored mice.
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http://dx.doi.org/10.1186/s40425-019-0503-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6352494PMC
January 2019

Mesenchymal-Epithelial Interactome Analysis Reveals Essential Factors Required for Fibroblast-Free Alveolosphere Formation.

iScience 2019 Jan 26;11:318-333. Epub 2018 Dec 26.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan; Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, Noda 278-0022, Japan. Electronic address:

Lung epithelial cells and fibroblasts are key cell populations in lung development. Fibroblasts support type 2 alveolar epithelial cells (AEC2) in the developing and mature lung. However, fibroblast-AEC2 interactions have not been clearly described. We addressed this in the present study by time course serial analysis of gene expression sequencing (SAGE-seq) of epithelial cells and fibroblasts of developing and mature murine lungs. We identified lung fibroblast-epithelial interactions that potentially regulate alveologenesis and are mediated by fibroblast-expressed ligands and epithelial cell surface receptors. In the epithelial-fibroblast co-culture alveolosphere formation assay, single intervention against fibroblast-expressed ligand or associated signaling cascades promoted or inhibited alveolosphere growth. Adding the ligand-associated molecules fibroblast growth factor 7 and Notch ligand and inhibitors of bone morphogenetic protein 4, transforming growth factor β, and glycogen synthase kinase-3β to the culture medium enabled fibroblast-free alveolosphere formation. The results revealed the essential factors regulating fibroblast-AEC2 interactions.
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http://dx.doi.org/10.1016/j.isci.2018.12.022DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6329323PMC
January 2019

Transcriptome network analysis identifies protective role of the LXR/SREBP-1c axis in murine pulmonary fibrosis.

JCI Insight 2019 Jan 10;4(1). Epub 2019 Jan 10.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Pulmonary fibrosis (PF) is an intractable disorder with a poor prognosis. Although lung fibroblasts play a central role in PF, the key regulatory molecules involved in this process remain unknown. To address this issue, we performed a time-course transcriptome analysis on lung fibroblasts of bleomycin- and silica-treated murine lungs. We found gene modules whose expression kinetics were associated with the progression of PF and human idiopathic PF (IPF). Upstream analysis of a transcriptome network helped in identifying 55 hub transcription factors that were highly connected with PF-associated gene modules. Of these hubs, the expression of Srebf1 decreased in line with progression of PF and human IPF, suggesting its suppressive role in fibroblast activation. Consistently, adoptive transfer and genetic modification studies revealed that the hub transcription factor SREBP-1c suppressed PF-associated gene expression changes in lung fibroblasts and PF pathology in vivo. Moreover, therapeutic pharmacological activation of LXR, an SREBP-1c activator, suppressed the Srebf1-dependent activation of fibroblasts and progression of PF. Thus, SREBP-1c acts as a protective hub of lung fibroblast activation in PF. Collectively, the findings of the current study may prove to be valuable in the development of effective therapeutic strategies for PF.
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http://dx.doi.org/10.1172/jci.insight.122163DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6485671PMC
January 2019

Dose-Dependent Effects of Insulin-Like Growth Factor 1 in the Aged Olfactory Epithelium.

Front Aging Neurosci 2018 20;10:385. Epub 2018 Nov 20.

Department of Otolaryngology, The University of Tokyo, Tokyo, Japan.

Olfaction is known to be impaired by aging. We hypothesized that insulin-like growth factor-1 (IGF-1) administered at an appropriate dose could prevent age-induced negative effects on olfactory receptor neurons (ORNs). We explored the effects of low- and high-dose administration of IGF-1 on the ORN cell system in aged mice and investigated the involvement of the cellular mechanisms of IGF-1 in the regeneration of ORNs in aged mice. We subcutaneously administered recombinant human IGF-1 (rhIGF-1) to 16-month-old male mice over 56 days, and then examined the histological effects of rhGF-1 on cellular composition, cell proliferation, and cell death in the aged olfactory epithelium (OE), by comparing among saline-treated and low- and high-dose rhIGF-1-treated mice. Low-dose rhIGF-1 administration increased the numbers of olfactory progenitors, immature ORNs, and mature ORNs in the OE, despite an increase in Cas3+ apoptotic cells. Notably, high-dose rhIGF-1 administration increased the numbers of only immature ORNs, not olfactory progenitors and mature ORNs, with a concurrent increase in apoptotic cells. Our data suggest that in aged mice, IGF-1 administered at an appropriate dose could increase the number of mature ORNs and further human studies may contribute to the development of treatments for aging-related olfactory impairment.
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http://dx.doi.org/10.3389/fnagi.2018.00385DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6256067PMC
November 2018

Lung fibroblasts express a miR-19a-19b-20a sub-cluster to suppress TGF-β-associated fibroblast activation in murine pulmonary fibrosis.

Sci Rep 2018 11 9;8(1):16642. Epub 2018 Nov 9.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Lung fibroblasts play a pivotal role in pulmonary fibrosis, a devastating lung disease, by producing extracellular matrix. MicroRNAs (miRNAs) suppress numerous genes post-transcriptionally; however, the roles of miRNAs in activated fibroblasts in fibrotic lungs remain poorly understood. To elucidate these roles, we performed global miRNA-expression profiling of fibroblasts from bleomycin- and silica-induced fibrotic lungs and investigated the functions of miRNAs in activated lung fibroblasts. Clustering analysis of global miRNA-expression data identified miRNA signatures exhibiting increased expression during fibrosis progression. Among these signatures, we found that a miR-19a-19b-20a sub-cluster suppressed TGF-β-induced activation of fibroblasts in vitro. Moreover, to elucidate whether fibroblast-specific intervention against the sub-cluster modulates pathogenic activation of fibroblasts in fibrotic lungs, we intratracheally transferred the sub-cluster-overexpressing fibroblasts into bleomycin-treated lungs. Global transcriptome analysis of the intratracheally transferred fibroblasts revealed that the sub-cluster not only downregulated expression of TGF-β-associated pro-fibrotic genes, including Acta2, Col1a1, Ctgf, and Serpine1, but also upregulated expression of the anti-fibrotic genes Dcn, Igfbp5, and Mmp3 in activated lung fibroblasts. Collectively, these findings indicated that upregulation of the miR-19a-19b-20a sub-cluster expression in lung fibroblasts counteracted TGF-β-associated pathogenic activation of fibroblasts in murine pulmonary fibrosis.
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http://dx.doi.org/10.1038/s41598-018-34839-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6226532PMC
November 2018

Cigarette Smoke-Induced Cell Death Causes Persistent Olfactory Dysfunction in Aged Mice.

Front Aging Neurosci 2018 13;10:183. Epub 2018 Jun 13.

Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

: Exposure to cigarette smoke is a cause of olfactory dysfunction. We previously reported that in young mice, cigarette smoke damaged olfactory progenitors and decreased mature olfactory receptor neurons (ORNs), then, mature ORNs gradually recovered after smoking cessation. However, in aged populations, the target cells in ORNs by cigarette smoke, the underlying molecular mechanisms by which cigarette smoke impairs the regenerative ORNs, and the degree of ORN regeneration after smoking cessation remain unclear. : To explore the effects of cigarette smoke on the ORN cell system using an aged mouse model of smoking, and to investigate the extent to which smoke-induced damage to ORNs recovers following cessation of exposure to cigarette smoke in aged mice. : We intranasally administered a cigarette smoke solution (CSS) to 16-month-old male mice over 24 days, then examined ORN existence, cell survival, changes of inflammatory cytokines in the olfactory epithelium (OE), and olfaction using histological analyses, gene analyses and olfactory habituation/dishabituation tests. : CSS administration reduced the number of mature ORNs in the OE and induced olfactory dysfunction. These changes coincided with an increase in the number of apoptotic cells and expression and a decrease in expression. Notably, the reduction in mature ORNs did not recover even on day 28 after cessation of treatment with CSS, resulting in persistent olfactory dysfunction. : In aged mice, by increasing ORN death, CSS exposure could eventually overwhelm the regenerative capacity of the OE, resulting in continued reduction in the number of mature ORNs and olfactory dysfunction.
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http://dx.doi.org/10.3389/fnagi.2018.00183DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6008309PMC
June 2018

Reduction of Proliferating Olfactory Cells and Low Expression of Extracellular Matrix Genes Are Hallmarks of the Aged Olfactory Mucosa.

Front Aging Neurosci 2018 27;10:86. Epub 2018 Mar 27.

Department of Otolaryngology, The University of Tokyo, Tokyo, Japan.

The incidence of olfactory impairment increases with age; however, the detailed molecular and cellular mechanisms underlying this increase are yet to be determined. We examined the influence of aging on olfactory receptor neurons (ORNs), which are maintained by a unique stem cell system, from olfactory progenitor cells to mature ORNs, by histological comparisons of the physiological status of the olfactory epithelium between young adult and aged mice. Furthermore, we clarified the expression of genes encoding inflammatory cytokines, neurotrophins, growth factors, and extracellular matrix proteins to reveal the molecular mechanisms underlying olfactory impairment caused by aging. The numbers of mature and immature ORNs, but not olfactory progenitors, decreased in the aged olfactory epithelium, with a concurrent reduction in Ki-67-positive proliferating cells. Transcriptome analyses revealed an increase in , encoding a component of senescence-associated secretary phenotypes (SASP), and a decrease in , encoding a growth factor for ORNs, in the aged nasal mucosa. Interestingly, expression levels of several extracellular matrix genes, including , decreased in the aged nasal mucosa. Consistent with the transcriptional changes, the number of -GFP-positive cells decreased in the aged lamina propria. Our data suggest that reduction in ORN number and cell proliferation, reduced extracellular matrix gene expression, and increased SASP contribute to olfactory impairment during aging.
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http://dx.doi.org/10.3389/fnagi.2018.00086DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5880952PMC
March 2018

Single blood transfusion induces the production of donor-specific alloantibodies and regulatory T cells mainly in the spleen.

Int Immunol 2018 03;30(2):53-67

Department of Anatomy (Macro), Dokkyo Medical University School of Medicine, Tochigi, Japan.

Donor-specific blood transfusion is known to induce alloresponses and lead to immunosuppression. We examined their underlying mechanisms by employing fully allogeneic rat combinations. Transfused recipients efficiently produced alloantibodies of the IgM and IgG subclasses directed against donor class I MHC. The recipients exhibited active expansion of CD4+ T cells and CD4+FOXP3+ regulatory T cells (Treg cells), followed by CD45R+ B cells and IgM+ or IgG subclass+ antibody-forming cells mainly in the spleen. From 1.5 days, the resident MHCII+CD103+ dendritic cells (DCs) in the splenic T-cell area, periarterial lymphocyte sheath, formed clusters with recipient BrdU+ or 5-ethynyl-2'-deoxyuridine+ cells, from which the proliferative response of CD4+ T cells originated peaking at 3-4 days. Transfusion-induced antibodies had donor passenger cell-depleting activity in vitro and in vivo and could suppress acute GvH disease caused by donor T cells. Furthermore, Treg cells significantly suppressed mixed leukocyte reactions in a donor-specific manner. In conclusion, single blood transfusion efficiently induced a helper T-cell-dependent anti-donor class I MHC antibody-forming cell response with immunoglobulin class switching, and a donor-specific Treg cell response mainly in the spleen, probably by way of the indirect allorecognition via resident DCs. These antibodies and Treg cells may be involved, at least partly, in the donor-specific transfusion-induced suppression of allograft rejection.
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http://dx.doi.org/10.1093/intimm/dxx078DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5892146PMC
March 2018

Increased diversity with reduced "diversity evenness" of tumor infiltrating T-cells for the successful cancer immunotherapy.

Sci Rep 2018 01 18;8(1):1058. Epub 2018 Jan 18.

Department of Immunotherapeutics, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, 113-8655, Japan.

To facilitate the optimization of cancer immunotherapy lacking immune-related adverse events, we performed TCR repertoire analysis of tumor-infiltrating CD8 T-cells in B16 melanoma-bearing mice receiving anti-PD-1, anti-CTLA-4, anti-4-1BB, anti-CD4 or a combination of anti-PD-1 and 4-1BB antibodies. Although CD8 T-cells in the tumor were activated and expanded to a greater or lesser extent by these therapies, tumor growth suppression was achieved only by anti-PD-1, anti-PD-1/4-1BB combined, or by anti-CD4 treatment, but not by anti-CTLA-4 or anti-4-1BB monotherapy. Increased CD8 T cell effector function and TCR diversity with enrichment of certain TCR clonotypes in the tumor was associated with anti-tumor effects. In contrast, polyclonal activation of T-cells in the periphery was associated with tissue damage. Thus, optimal combination therapy increases TCR diversity with extended activation of selective CD8 T-cells specifically in the tumor but not in the periphery. Incorporation of the concept of evenness for the TCR diversity is proposed.
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http://dx.doi.org/10.1038/s41598-018-19548-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5773695PMC
January 2018

Long-Lasting Graft-Derived Donor T Cells Contribute to the Pathogenesis of Chronic Graft-versus-Host Disease in Mice.

Front Immunol 2017 18;8:1842. Epub 2017 Dec 18.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Chronic graft-versus-host disease (cGVHD) is a major complication in long-term survivors of allogeneic hematopoietic stem cell transplantation (allo-HSCT). Graft-derived T cells (T) have been implicated in the induction of cGVHD; however, the extent of their contribution to the pathogenesis of cGVHD remains unclear. Using a mouse model of cGVHD, we demonstrate that T predominate over hematopoietic stem cell-derived T cells generated (T) in cGVHD-affected organs such as the liver and lung even at day 63 after allo-HSCT. Persisting T, in particular CD8 T, not only displayed an exhausted or senescent phenotype but also contained a substantial proportion of cells that had the potential to proliferate and produce inflammatory cytokines. Host antigens indirectly presented by donor HSC-derived hematopoietic cells were involved in the maintenance of T in the reconstituted host. Selective depletion of T in the chronic phase of disease resulted in the expansion of T and thus neither the survival nor histopathology of cGVHD was ameliorated. On the other hand, T depletion caused activation of T and resulted in a lethal T-mediated exacerbation of GVHD. The findings presented here clarify the pathological role of long-lasting T in cGVHD.
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http://dx.doi.org/10.3389/fimmu.2017.01842DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5741650PMC
December 2017

The HIV co-receptor CCR5 regulates osteoclast function.

Nat Commun 2017 12 20;8(1):2226. Epub 2017 Dec 20.

Division of Bio-Imaging, Proteo-Science Center (PROS), Ehime University, Ehime, 791-0295, Japan.

C-C chemokine receptor 5 (CCR5) is a co-receptor of HIV. Epidemiological findings suggest that the functional loss of CCR5 is correlated with a lower incidence of bone-destructive diseases as well as of HIV transmission. However, it is not clear whether CCR5 is involved in regulation of the function of bone cells, in addition to that of immune cells. Here we show that blockade of CCR5 using specific antibodies impairs human osteoclast function in vitro. Ccr5-deficient (Ccr5 ) mice presented with dysfunctional osteoclasts and were resistant to osteoporosis induced by receptor activator of nuclear factor kappa-B ligand (RANKL), which triggers osteoporosis independently of inflammatory and immunomodulatory pathways. Furthermore, Ccr5 deficiency impairs the cellular locomotion and bone-resorption activity of osteoclasts, which is associated with the disarrangement of podosomes and adhesion complex molecules including Pyk2. Overall, the data provides evidence that CCR5 has an essential role in bone-destructive conditions through the functional regulation of osteoclasts.
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http://dx.doi.org/10.1038/s41467-017-02368-5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5738403PMC
December 2017

Optimized retroviral transduction of mouse T cells for in vivo assessment of gene function.

Nat Protoc 2017 Sep 31;12(9):1980-1998. Epub 2017 Aug 31.

Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Retroviral (RV) expression of genes of interest (GOIs) is an invaluable tool and has formed the foundation of cellular engineering for adoptive cell therapy in cancer and other diseases. However, monitoring of transduced T cells long term (weeks to months) in vivo remains challenging because of the low frequency and often poor durability of transduced T cells over time when transferred without enrichment. Traditional methods often require additional overnight in vitro culture after transduction. Moreover, in vitro-generated effector CD8 T cells enriched by sorting often have reduced viability, making it difficult to monitor the fate of transferred cells in vivo. Here, we describe an optimized mouse CD8 T-cell RV transduction protocol that uses simple and rapid Percoll density centrifugation to enrich RV-susceptible activated CD8 T cells. Percoll density centrifugation is simple, can be done on the day of transduction, requires minimal time, has low reagent costs and improves cell recovery (up to 60%), as well as the frequency of RV-transduced cells (∼sixfold over several weeks in vivo as compared with traditional methods). We have used this protocol to assess the long-term stability of CD8 T cells after RV transduction by comparing the durability of T cells transduced with retroviruses expressing each of six commonly used RV reporter genes. Thus, we provide an optimized enrichment and transduction approach that allows long-term in vivo assessment of RV-transduced T cells. The overall procedure from T-cell isolation to RV transduction takes 2 d, and enrichment of activated T cells can be done in 1 h.
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http://dx.doi.org/10.1038/nprot.2017.083DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6020692PMC
September 2017

Combination of anti-CD4 antibody treatment and donor lymphocyte infusion ameliorates graft-versus-host disease while preserving graft-versus-tumor effects in murine allogeneic hematopoietic stem cell transplantation.

Cancer Sci 2017 Oct 29;108(10):1967-1973. Epub 2017 Aug 29.

Department of Molecular Preventive Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is not only a well-established immunotherapy for hematologic malignancies, but is potentially useful for treating solid tumors refractory to available therapies. However, application of allo-HSCT to solid tumors is limited, despite the beneficial antitumor effects, by the risk of graft-versus-host disease (GVHD). CD4 T cells have been implicated in several aspects of GVHD, and suppress antitumor CD8 T-cell responses. In the present study, we investigated clinically applicable allo-HSCT protocols designed to maximize antitumor effects while reducing the risk of GVHD. We used a mouse model of allo-HSCT with s.c. tumors. We found that myeloablative conditioning was associated with better inhibition of tumor growth but with severe acute GVHD. Early treatment with anti-CD4 mAb substantially ameliorated GVHD while preserving antitumor effects, leading to improved survival in myeloablative allo-HSCT. Late treatment with anti-CD4 mAb also ameliorated GVHD to some extent. Donor lymphocyte infusion in GVHD mice treated with anti-CD4 mAb further suppressed tumor growth without exacerbating GVHD. Collectively, our results suggest that myeloablative allo-HSCT followed by anti-CD4 mAb treatment and donor lymphocyte infusion could be a potent and safe immunotherapy for patients with cancers refractory to available therapies.
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http://dx.doi.org/10.1111/cas.13346DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5623734PMC
October 2017

Laryngeal mucus hypersecretion is exacerbated after smoking cessation and ameliorated by glucocorticoid administration.

Toxicol Lett 2017 Jan 2;265:140-146. Epub 2016 Dec 2.

Department of Otolaryngology, The University of Tokyo, Japan.

Introduction: The mechanisms underlying the effects of cigarette smoke and smoking cessation on respiratory secretion, especially in the larynx, remain unclear.

Objectives: The aims of this study were to determine the effects of cigarette smoke and smoking cessation on laryngeal mucus secretion and inflammation, and to investigate the effects of glucocorticoid administration.

Methods: We administered cigarette smoke solution (CSS) to eight-week-old male Sprague Dawley rats for four weeks, then examined laryngeal mucus secretion and inflammatory cytokine expression on days 1, 28 and 90 after smoking cessation. We also investigated the effects of the glucocorticoid triamcinolone acetonide when administered on day 1 after smoking cessation.

Results: Exposure to CSS resulted in an increase in laryngeal mucus secretion that was further excacerbated following smoking cessation. This change coincided with an increase in the expression of mRNA for the inflammatory cytokines tumor necrosis factor and interleukin-6, as well as mRNA for MUC5AC, which is involved in mucin production. Triamcinolone suppressed CSS-induced laryngeal mucus hypersecretion and pro-inflammatory cytokine production.

Conclusion: Cigarette smoke-associated inflammation may contribute to the exacerbated laryngeal mucus hypersecretion that occurs following smoking cessation. The inflammatory response represents a promising target for the treatment of cigarette smoke-associated mucus hypersecretion.
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http://dx.doi.org/10.1016/j.toxlet.2016.11.023DOI Listing
January 2017