Publications by authors named "Rie Kawano"

18 Publications

  • Page 1 of 1

[Successful treatment with cidofovir for disseminated adenovirus infection accompanied by hemophagocytic syndrome and meningitis in an allogeneic hematopoietic stem cell transplantation recipient].

Rinsho Ketsueki 2021 ;62(4):251-256

Department of Hematology, Oita University Hospital.

A 65-year-old woman received bone marrow transplantation from an HLA-DRB1 one locus mismatched donor for high-risk myelodysplastic syndrome. On day 237 after transplantation, she developed recurrent acute gastrointestinal graft-versus-host disease and adenoviral hemorrhagic cystitis. Hence, the methylprednisolone (mPSL) dose was increased to 2 mg/kg, and mesenchymal stem cells were administered. After the dose was tapered, she developed high fever, gross hematuria, and progressive pancytopenia. Then, the serum LDH, ferritin, and hepatobiliary enzyme levels of the patient increased, and hemophagocytosis was observed based on bone marrow examination. The adenovirus DNA level in the plasma was 6.3×10 copies/ml on day 278, and the volume of cerebrospinal fluid increased. Hence, the patient was diagnosed with meningitis and disseminated adenovirus infection. On day 288, cidofovir was administered at a dose of 1 mg/kg three times a week for 8 doses. The mPSL dose was again increased to 2 mg/kg for the treatment of hemophagocytic syndrome. Then, the patient's symptoms gradually improved, and the adenovirus viral load became negative on day 369. Based on the clinical course of our patient, cidofovir is useful for severe adenovirus infection.
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http://dx.doi.org/10.11406/rinketsu.62.251DOI Listing
May 2021

Kinetics and clinical significance of human herpesvirus 6 DNA shedding in saliva after allogeneic hematopoietic stem cell transplantation.

Transpl Infect Dis 2021 Jun 2;23(3):e13512. Epub 2020 Dec 2.

Department of Hematology, Nagano Red Cross Hospital, Nagano, Japan.

Background: Little is known about the kinetics and clinical significance of saliva human herpesvirus-6 (HHV-6) DNA after hematopoietic stem cell transplantation (HSCT).

Methods: In this observational study, we quantified HHV-6 DNA in serially collected plasma and saliva from allogeneic HSCT recipients. Associations between the status of salivary HHV-6 DNA and the development of HHV-6 encephalitis, depression, and oral mucosal graft-versus-host disease (GVHD) were retrospectively analyzed.

Results: A total of 787 plasma and 434 saliva samples were collected from 56 patients. The cumulative incidence of HHV-6 DNA in plasma and saliva at 60 days after transplantation was 51.8% and 83.9%, respectively. The peak level of salivary HHV-6 DNA was significantly higher in patients who displayed plasma HHV-6 DNA than in those who did not (median, 51,584 copies/mL vs 587 copies/mL; P < .0001). Salivary HHV-6 DNA levels increased after positive plasma HHV-6 DNA was detected and remained high during observation period. Despite the frequent occurrence of positive salivary HHV-6 DNA, no patient developed depression. Positivity of salivary HHV-6 DNA was not significantly associated with the development of HHV-6 encephalitis (P = 1.00, Fisher's exact test) or oral mucosal GVHD (P = .71, Grey's test). No significant relationship between salivary HHV-6 DNA and these diseases was found even when comparing higher HHV-6 DNA loads in saliva.

Conclusion: Salivary HHV-6 DNA levels increased after HHV-6 DNA was detected in the blood. However, no epidemiological evidence was shown to support a role of salivary HHV-6 in the development of HHV-6 encephalitis, depression, and oral mucosal GVHD.
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http://dx.doi.org/10.1111/tid.13512DOI Listing
June 2021

[Successful delivery after chemotherapy for acute myeloid leukemia diagnosed in the second trimester].

Rinsho Ketsueki 2020 ;61(3):228-233

Department of Medical Oncology and Hematology, Oita University Faculty of Medicine.

Development of acute myeloid leukemia (AML) during pregnancy is rare, and the available data are limited to small retrospective reports. Currently, no guidelines exist for the management of AML during pregnancy in Japan. A 26-year-old female was diagnosed with AML at 19 weeks of gestation, received chemotherapy with daunorubicin and cytarabine, and achieved complete remission. Following the first consolidation therapy, she gave birth to a 1964-g female infant by cesarean section at 33 weeks of gestation. One week later, she was initiated on the second consolidation therapy; however, she developed a pelvic abscess during neutropenia. She underwent urgent surgery for open drainage and recovered soon after surgery. She has been in complete remission for eight months, and the daughter is healthy. Chemotherapy delivered after the second trimester rarely causes congenital malformations and may not require the termination of pregnancy. The clinical course of the present case suggests that chemotherapy can be performed safely and effectively in pregnant patients with AML after the trimester and babies.
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http://dx.doi.org/10.11406/rinketsu.61.228DOI Listing
May 2020

[Philadelphia chromosome-positive acute lymphoblastic leukemia relapsing with an anterior chamber lesion of the eye].

Rinsho Ketsueki 2019;60(2):134-136

Department of Medical Oncology and Hematology, Oita University Faculty of Medicine.

A 48-year-old Filipino woman underwent umbilical cord blood stem cell transplantation for Philadelphia chromosome-positive acute lymphoblastic leukemia under non-remission status. Left aqueous humor puncture was performed owing to the development of left eye pain and exacerbation of anterior eye chamber inflammation 72 days after the transplantation; this revealed the relapse of leukemia in the anterior chamber. Subsequently, the patient tested positive for peripheral blood minimal residual disease. Therefore, doctors should take note that anterior chamber disease may appear as a non-typical relapse of leukemia.
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http://dx.doi.org/10.11406/rinketsu.60.134DOI Listing
August 2019

Comparison of HHV-6 DNA detection in plasma and whole blood in allogeneic hematopoietic stem cell transplant recipients: frequent false-positive results for active HHV-6 infection using whole blood samples.

Int J Hematol 2018 Nov 16;108(5):535-542. Epub 2018 Jul 16.

Department of Medical Oncology and Hematology, Oita University Faculty of Medicine, Oita, Japan.

In this prospective observational study, we compared the human herpesvirus-6 (HHV-6) DNA load in serially collected paired plasma and whole blood (WB) samples from allogeneic hematopoietic stem cell transplantation (HSCT) recipients. A total of 721 paired samples were collected from 68 recipients. The positive rate for HHV-6 DNA was 9.7 and 35.0% in plasma and WB samples, respectively (P < 0.001). The correlation of HHV-6 DNA load between plasma and WB was poor (R = 0.250). After reaching peak levels, HHV-6 DNA showed a delayed decrease in WB in comparison with plasma (median, 28 versus 7 days, P < 0.001). We additionally tested HHV-6 mRNA status in 95 samples from eight patients. To identify positive HHV-6 mRNA, plasma HHV-6 DNA showed 55.0% sensitivity and 100% specificity, whereas WB HHV-6 DNA showed 90.0% sensitivity and 68.0% specificity. The false-positive rate for identifying positive HHV-6 mRNA was 0% for plasma HHV-6 DNA and 32.0% for WB HHV-6 DNA. Although WB was more sensitive than plasma for detecting HHV-6 reactivation, the rates of false positivity for active HHV-6 infection were higher for WB than for plasma.
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http://dx.doi.org/10.1007/s12185-018-2498-zDOI Listing
November 2018

[Successful treatment of secondary graft failure in a mixed-phenotype acute leukemia patient with haploidentical hematopoietic stem cell transplantation and post-transplant cyclophosphamide administration].

Rinsho Ketsueki 2018;59(5):485-488

Department of Medical Oncology and Hematology, Oita University Faculty of Medicine.

A 38-year-old woman in the first remission of mixed-phenotype acute leukemia underwent unrelated bone marrow transplantation from an HLA-DR-mismatched donor in the host-versus-graft (HVG) direction with myeloablative conditioning. Neutrophil engraftment was achieved and complete donor chimera was obtained on days 21 and 29 after transplantation, respectively. Subsequently, with delayed blood cell recovery, continuous transfusion was needed to replace platelets. In the CD3 peripheral blood chimerism test, the percentage of recipient cells on days 50, 63, and 80 was 27.3%, 90%, and 95% or higher, respectively. With no relapse of leukemia observed on bone marrow examination, secondary graft failure associated with autologous hematopoietic recovery was diagnosed. Bone marrow transplantation from the patient's HLA-haploidentical sister was performed because of graft failure on day 111 after the initial transplant using post-transplant cyclophosphamide (PTCy). Neutrophil engraftment was achieved and complete donor chimera was obtained on days 14 and 21 after the second transplantation, respectively. With no serious complications or acute graft versus host disease, the patient was discharged with symptomatic improvement. According to our results, retransplant using PTCy obtained from an HLA-haploidentical sibling donor is a potential treatment for graft failure.
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http://dx.doi.org/10.11406/rinketsu.59.485DOI Listing
May 2019

Cadherin-7 enhances Sonic Hedgehog signalling by preventing Gli3 repressor formation during neural tube patterning.

Open Biol 2017 12;7(12)

Department of Chemistry, Sapienza University of Rome, Rome, Italy.

Sonic Hedgehog (Shh) is a ventrally enriched morphogen controlling dorsoventral patterning of the neural tube. In the dorsal spinal cord, Gli3 protein bound to suppressor-of-fused (Sufu) is converted into Gli3 repressor (Gli3R), which inhibits Shh-target genes. Activation of Shh signalling prevents Gli3R formation, promoting neural tube ventralization. We show that cadherin-7 (Cdh7) expression in the intermediate spinal cord region is required to delimit the boundary between the ventral and the dorsal spinal cord. We demonstrate that Cdh7 functions as a receptor for Shh and enhances Shh signalling. Binding of Shh to Cdh7 promotes its aggregation on the cell membrane and association of Cdh7 with Gli3 and Sufu. These interactions prevent Gli3R formation and cause Gli3 protein degradation. We propose that Shh can act through Cdh7 to limit intracellular movement of Gli3 protein and production of Gli3R, thus eliciting more efficient activation of Gli-dependent signalling.
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http://dx.doi.org/10.1098/rsob.170225DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5746549PMC
December 2017

A New Amino Acid Substitution at G150S in Lanosterol 14-α Demethylase (Erg11 protein) in Multi-azole-resistant Trichosporon asahii.

Med Mycol J 2017 ;58(1):E23-E28

Department of Respiratory Medicine, Fukuoka University Hospital.

The mechanisms of azole resistance in Trichosporon asahii have not yet been fully clarified. We previously showed that T. asahii has the ERG11 gene, coding lanosterol 14-α-demethylase (Erg11 protein; Erg11p), which is the primary target of azoles. A single amino acid substitution at G453R in Erg11p was found to induce changes in the affinity of this enzyme for azoles, especially fluconazole, in vitro. In the present study, we investigated the DNA sequences of the ERG11 gene using six different strains of clinically isolated T. asahii that were highly resistant to multi-azoles, including fluconazole, itraconazole, and voriconazole. All of the T. asahii strains had a point mutation (G448A) that caused a single amino acid substitution at G150S in Erg11p. This amino acid is highly conserved among major fungal pathogens. We identified a new point mutation in the ERG11 gene that is common to clinically isolated azole-resistant T. asahii strains, suggesting that this mutation is associated with the multi-azole resistance of T. asahii.
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http://dx.doi.org/10.3314/mmj.16-00027DOI Listing
August 2017

Akhirin regulates the proliferation and differentiation of neural stem cells in intact and injured mouse spinal cord.

Dev Neurobiol 2015 May 30;75(5):494-504. Epub 2014 Oct 30.

Department of Developmental Neurobiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, 860-8556, Japan; Stem Cell-Based Tissue Regeneration Research and Education Unit, Kumamoto University, Kumamoto 1-1-1 Honjo, Kumamoto, 860-8556, Japan; Globle COE "Cell Fate Regulation Research and Education Unit", Kumamoto University, 2-2-1 Honjo, Kumamoto, 860-8556, Japan; Ministry of Higher Education- Saudi Arabia, Al Maather Area 225085, Riyadh 11153, Saudi Arabia.

Although the central nervous system is considered a comparatively static tissue with limited cell turnover, cells with stem cell properties have been isolated from most neural tissues. The spinal cord ependymal cells show neural stem cell potential in vitro and in vivo in injured spinal cord. However, very little is known regarding the ependymal niche in the mouse spinal cord. We previously reported that a secreted factor, chick Akhirin, is expressed in the ciliary marginal zone of the eye, where it works as a heterophilic cell-adhesion molecule. Here, we describe a new crucial function for mouse Akhirin (M-AKH) in regulating the proliferation and differentiation of progenitors in the mouse spinal cord. During embryonic spinal cord development, M-AKH is transiently expressed in the central canal ependymal cells, which possess latent neural stem cell properties. Targeted inactivation of the AKH gene in mice causes a reduction in the size of the spinal cord and decreases BrdU incorporation in the spinal cord. Remarkably, the expression patterns of ependymal niche molecules in AKH knockout (AKH-/-) mice are different from those of AKH+/+, both in vitro and in vivo. Furthermore, we provide evidence that AKH expression in the central canal is rapidly upregulated in the injured spinal cord. Taken together, these results indicate that M-AKH plays a crucial role in mouse spinal cord formation by regulating the ependymal niche in the central canal.
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http://dx.doi.org/10.1002/dneu.22238DOI Listing
May 2015

Tsukushi is involved in the wound healing by regulating the expression of cytokines and growth factors.

J Cell Commun Signal 2014 Sep 27;8(3):173-7. Epub 2014 Aug 27.

Department of Developmental Neurobiology, Graduate School of Life Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto, 860-8556, Japan.

During the wound-healing process, macrophages, fibroblasts, and myofibroblasts play a leading role in shifting from the inflammation phase to the proliferation phase, although little is known about the cell differentiation and molecular control mechanisms underlying these processes. Previously, we reported that Tsukushi (TSK), a member of the small leucine-rich repeat proteoglycan family, functions as a key extracellular coordinator of multiple signalling networks. In this study, we investigated the contribution of TSK to wound healing. Analysis of wound tissue in heterozygous TSK-lacZ knock-in mice revealed a pattern of sequential TSK expression from macrophages to myofibroblasts. Quantitative PCR and in vitro cell induction experiments showed that TSK controls macrophage function and myofibroblast differentiation by inhibiting TGF-β1 secreted from macrophages. Our results suggest TSK facilitates wound healing by maintaining inflammatory cell quiescence.
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http://dx.doi.org/10.1007/s12079-014-0241-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4165825PMC
September 2014

Lactic acid bacteria convert human fibroblasts to multipotent cells.

PLoS One 2012 26;7(12):e51866. Epub 2012 Dec 26.

Department of Developmental Neurobiology, Graduate School of Life Sciences, Kumamoto University, Kumamoto, Japan.

The human gastrointestinal tract is colonized by a vast community of symbionts and commensals. Lactic acid bacteria (LAB) form a group of related, low-GC-content, gram-positive bacteria that are considered to offer a number of probiotic benefits to general health. While the role of LAB in gastrointestinal microecology has been the subject of extensive study, little is known about how commensal prokaryotic organisms directly influence eukaryotic cells. Here, we demonstrate the generation of multipotential cells from adult human dermal fibroblast cells by incorporating LAB. LAB-incorporated cell clusters are similar to embryoid bodies derived from embryonic stem cells and can differentiate into endodermal, mesodermal, and ectodermal cells in vivo and in vitro. LAB-incorporated cell clusters express a set of genes associated with multipotency, and microarray analysis indicates a remarkable increase of NANOG, a multipotency marker, and a notable decrease in HOX gene expression in LAB-incorporated cells. During the cell culture, the LAB-incorporated cell clusters stop cell division and start to express early senescence markers without cell death. Thus, LAB-incorporated cell clusters have potentially wide-ranging implications for cell generation, reprogramming, and cell-based therapy.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0051866PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3530539PMC
July 2013

Tsukushi controls the hair cycle by regulating TGF-β1 signaling.

Dev Biol 2012 Dec 18;372(1):81-7. Epub 2012 Sep 18.

Department of Developmental Neurobiology, Graduate School of Life Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan.

The hair follicle contains stem/progenitor cells that supply progeny for skin development and the hair cycle. Several signaling molecules belonging to the Wnt, BMP, shh, and transforming growth factor β (TGF-β) signaling cascades are involved in the normal hair follicle cycle. However, the systemic mechanism of how these humoral factors are controlled remains largely unknown. Previously, we reported that Tsukushi (TSK), a member of the small leucine-rich repeat proteoglycan family, functions extracellularly as a key coordinator of multiple signaling networks. Here, we show that TSK is expressed at the restricted areas of hair follicle during the morphogenesis and the hair cycle. Targeted disruption of the TSK gene causes the hair cycle to be delayed with low levels of TGF-β1 and phosphorylated Smad2/3 (pSmad2/3) expression. Biochemical analysis indicates that TSK directly binds to TGF-β1. Our data suggest that TSK controls the hair cycle by regulating TGF-β1 signaling.
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http://dx.doi.org/10.1016/j.ydbio.2012.08.030DOI Listing
December 2012

Cloning of the lanosterol 14-α-demethylase ( ERG11 ) gene in Trichosporon asahii: a possible association between G453R amino acid substitution and azole resistance in T. asahii.

FEMS Yeast Res 2012 Sep 18;12(6):662-7. Epub 2012 Jun 18.

Internal Medicine , Oita University, Oita, Japan.

Lanosterol 14-α-demethylase ( Erg11 protein; Erg11p ), encoded by the ERG11 gene, is the primary target of azoles. Recently, a change in affinity of this enzyme for azoles has been reported as a resistance mechanism in several fungal species. Trichosporon asahii ( T. asahii) is susceptible to fluconazole (FLC). This report identified the ERG11 gene of T. asahii (NCBI accession; HQ176415). The Erg11p of T. asahii, presumed from the DNA sequence, was closely related to the Erg11p of Cryptococcus neoformans. Furthermore, a FLC-susceptible strain was cultured in medium containing FLC at concentrations from 4.0 to 16 μg mL(-1) in order to analyze the development of FLC resistance in T. asahii. The degree of resistance was related to the FLC concentration of the growth medium. One highly resistant strain that was cultured in the medium containing 16 μg mL(-1) FLC contained 1 point mutation (G1357C) that caused a single amino acid substitution at G453R. This amino acid is highly conserved among major fungal pathogens, and it is in a region very close to the heme-binding domain, which is characteristic of the cytochrome P450 superfamily, the primary target for the azole class of antifungal agents. This amino acid substitution may have caused the high resistance to azoles in T. asahii.
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http://dx.doi.org/10.1111/j.1567-1364.2012.00816.xDOI Listing
September 2012

High incidence of cytomegalovirus, human herpesvirus-6, and Epstein-Barr virus reactivation in patients receiving cytotoxic chemotherapy for adult T cell leukemia.

J Med Virol 2011 Apr;83(4):702-9

Blood Transfusion Center, Oita University Hospital, Oita, Japan.

The etiology of cytomegalovirus (CMV), human herpesvirus-6 (HHV-6), and Epstein-Barr virus (EBV) reactivation and the potential for complications following cytotoxic chemotherapy in the absence of allogeneic transplantation are not clearly understood. Patients with adult T cell leukemia (ATL) are susceptible to opportunistic infections. In this study, the incidence, kinetics and clinical significance of reactivation of CMV, HHV-6, and EBV in ATL patients were investigated. Viral DNA in a total of 468 plasma samples from 34 patients was quantified using real-time PCR. The probability of CMV, HHV-6, and EBV reactivation by 100 days after the start of chemotherapy was 50.6%, 52.3%, and 21.6%, respectively. Although most CMV reactivations were self-limited, plasma CMV DNA tended to persist or increase if the CMV DNA levels in plasma reached ≥ 10(4) copies/ml. CMV reactivation was negatively associated with survival, but the P-value for this association was near the borderline of statistical significance (P=0.052). One patient developed fatal interstitial pneumonia concomitant with peak CMV DNA accumulation (1.6 × 10(6)  copies/ml plasma). Most HHV-6 and EBV reactivations were self-limited, and no disease resulting from HHV-6 or EBV was confirmed. HHV-6 and EBV reactivation were not associated with reduced survival (P=0.35 and 0.11, respectively). These findings demonstrated that subclinical reactivation of CMV, HHV-6, and EBV were common in ATL patients receiving chemotherapy. There were differences in the viral reactivation patterns among the three viruses. A CMV load ≥ 10(4) copies/ml plasma was indicative of subsequent exacerbation of CMV reactivation and developing serious clinical course.
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http://dx.doi.org/10.1002/jmv.22013DOI Listing
April 2011

Human herpesvirus 6 DNA in plasma after allogeneic stem cell transplantation: incidence and clinical significance.

J Infect Dis 2006 Jan 30;193(1):68-79. Epub 2005 Nov 30.

Division of Pathogenesis and Disease Control, Department of Infectious Diseases, Oita University Faculty of Medicine, Japan.

Background: Human herpesvirus 6 (HHV-6) is increasingly recognized as an opportunistic and potentially life-threatening pathogen in recipients of allogeneic stem cell transplants (SCTs).

Methods: To clarify the incidence and clinical relevance of active HHV-6 infection, serial titers of plasma HHV-6 DNA were determined for 50 allogeneic SCT recipients, using real-time polymerase chain reaction.

Results: HHV-6 DNA was detected in plasma from 24 patients (48%). HHV-6 DNA was most frequently apparent approximately 14-27 days after transplantation. An increased risk of a positive result for HHV-6 DNA was associated with transplantation from an allelic-mismatch donor (P = .02) and administration of steroids (P = .04). Steroid use was associated with high HHV-6 DNA loads (P = .02). High HHV-6 DNA loads were correlated with delayed platelet engraftment (P = .04). Among patients who had positive results for HHV-6 DNA, the HHV-6 DNA load was higher in plasma from those who developed limbic encephalitis (n = 4) (P < .0001).

Conclusions: Active HHV-6 infection is not rare in SCT recipients. SCT from allelic-mismatch donors is associated with increased risk of active HHV-6 infection. Steroid therapy is associated with not only increased incidence of infection but also accelerated viral replication. Development of limbic encephalitis is associated with high HHV-6 DNA load.
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http://dx.doi.org/10.1086/498531DOI Listing
January 2006

Real-time PCR assay compared to nested PCR and antigenemia assays for detecting cytomegalovirus reactivation in adult T-cell leukemia-lymphoma patients.

J Clin Microbiol 2003 Sep;41(9):4382-7

Department of Infectious Diseases, Oita Medical University, Oita, Japan.

We analyzed the efficiency of the quantitative real-time PCR assay for cytomegalovirus (CMV) reactivation in adult T-cell leukemia-lymphoma (ATL) patients and compared the results with those obtained with qualitative nested PCR and antigenemia assays. The viral load obtained by the real-time PCR assay closely paralleled the number of antigen-positive cells obtained with the antigenemia assay. Real-time PCR revealed that a large number of DNA copies could be present even in samples assessed as negative or low in antigen-positive cells (0 to 10 antigen-positive cells/50,000 cells) by antigenemia assay. CMV copy numbers did not differ between the negative and low-antigen-positive groups. When the input concentration for real-time PCR assay was 2,500 to 5,000 copies/ml, the positivity rate for the nested PCR assay was 47.3%, while the positivity rate was more than 90% at an input concentration of >/=50,000 copies/ml. Real-time PCR is more sensitive than the antigenemia and nested PCR assays. Moreover, real-time PCR was able to detect CMV reactivation earlier than the antigenemia and nested PCR assays through the use of longitudinal analysis in four ATL patients with CMV pneumonia. In longitudinal assessments, analysis of the results suggested that a cutoff level of 5,000 copies/ml might be used to initiate treatment. Real-time PCR is more suitable for monitoring CMV reactivation in ATL patients than the antigenemia and nested PCR assays. CMV viral loads of 5,000 copies/ml are proposed as the cutoff for initiating antiviral therapy in ATL patients.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC193823PMC
http://dx.doi.org/10.1128/JCM.41.9.4382-4387.2003DOI Listing
September 2003

Identification and characterization of a soluble cadherin-7 isoform produced by alternative splicing.

J Biol Chem 2002 Dec 2;277(49):47679-85. Epub 2002 Oct 2.

Department of Anatomy, Biology, and Medicine and the Department of Infectious Diseases, Oita Medical University, Hasama-machi, Oita 879-5593, Japan.

We identified an alternative mRNA encoding a novel cadherin-7 isoform by reverse transcriptase-PCR of RNA from day 12 chicken embryos. The alternative mRNA contains 49 bases of insertion in the premembrane region, leading to the substitution of 14 amino acids and the introduction of a premature stop codon. Identification of a 49-bp insertion sequence in the genomic DNA corresponding to the intron of the cadherin-7 gene suggests that alternative splicing is the cause of the alternative mRNA. Transient expression of the variant form in COS-7 or 293 cells produced a soluble protein. Aggregation assays and immunoprecipitation showed that the variant protein interacts with full-length cadherin-7 in vitro and in vivo and inhibits full-length cadherin-7-mediated cell adhesion. Immunohistochemistry revealed that the variant form was strongly expressed in dermomyotomes rather than in migrating neural crest cells, in contrast to the full-length cadherin-7, suggesting differential regulation of splicing and possible roles of variant cadherin-7 in the development of dermomyotomes and other tissues.
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http://dx.doi.org/10.1074/jbc.M205328200DOI Listing
December 2002
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