Publications by authors named "Denise van Uden"

5 Publications

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Loss of immune homeostasis in patients with idiopathic pulmonary arterial hypertension.

Thorax 2021 May 7. Epub 2021 May 7.

Department of Pulmonary Medicine, Erasmus Universiteit Rotterdam, Rotterdam, The Netherlands

Introduction: Autoreactivity against pulmonary vascular structures is thought to be involved in idiopathic pulmonary arterial hypertension (IPAH), but the underlying mechanisms remain poorly understood. We hypothesised that aberrant B-cell activation contributes to IPAH aetiology.

Methods: Mice with enhanced B-cell activation due to B-cell-specific overexpression of the B-cell receptor (BCR) signalling molecule Bruton's tyrosine kinase (BTK) were subjected to lung injury and examined for several pulmonary hypertension (PH) indices. Peripheral blood lymphocytes from patients with IPAH (n=13), connective tissue disease-associated PAH (CTD-PAH, n=9), congenital heart disease PAH (n=7), interstitial lung disease associated PH (n=17) and healthy controls (n=19) were characterised by 14-colour flow cytometry.

Results: Following pulmonary injury, BTK-overexpressing mice showed prolonged activation of B cells and CXCR5 follicular T-helper (Tfh) cells, as well as features of PH development. Patients with CTD-PAH and CHD-PAH displayed reduced proportions of circulating non-switched-memory B cells (p=0.03, p=0.02, respectively). Interestingly, we observed increased BTK protein expression in naive (p=0.007) and memory B-cell subsets of patients with IPAH and CTD-PAH. BTK was particularly high in patients with IPAH with circulating autoantibodies (p=0.045). IPAH patients had low frequencies of circulating CXCR5 Tfh cells (p=0.005). Hereby, the increased BTK protein expression in B cells was associated with high proportions of Tfh17 (p=0.018) and Tfh17.1 (p=0.007) cells within the circulating Tfh population.

Conclusions: Our study shows that pulmonary injury in combination with enhanced B-cell activation is sufficient to induce PH symptoms in mice. In parallel, immune homeostasis in patients with IPAH is compromised, as evidenced by increased BCR signalling and cTfh17 polarisation, indicating that adaptive immune activation contributes to IPAH disease induction or progression.
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http://dx.doi.org/10.1136/thoraxjnl-2020-215460DOI Listing
May 2021

Central Role of Dendritic Cells in Pulmonary Arterial Hypertension in Human and Mice.

Int J Mol Sci 2021 Feb 10;22(4). Epub 2021 Feb 10.

Department of Pulmonary Medicine, Erasmus MC, University Medical Center Rotterdam, 3015 GD Rotterdam, The Netherlands.

The pathogenesis of idiopathic pulmonary arterial hypertension (IPAH) is not fully understood, but evidence is accumulating that immune dysfunction plays a significant role. We previously reported that 31-week-old mice develop pulmonary hypertension (PH) symptoms. These mice harbor a targeted deletion of the TNFα-induced protein-3 () gene, encoding the NF-κB regulatory protein A20, specifically in type I conventional dendritic cells (cDC1s). Here, we studied the involvement of dendritic cells (DCs) in PH in more detail. We found various immune cells, including DCs, in the hearts of mice, particularly in the right ventricle (RV). Secondly, in young mice, innate immune activation through airway exposure to toll-like receptor ligands essentially did not result in elevated RV pressures, although we did observe significant RV hypertrophy. Thirdly, PH symptoms in mice were not enhanced by concomitant mutation of bone morphogenetic protein receptor type 2 (), which is the most affected gene in PAH patients. Finally, in human IPAH lung tissue we found co-localization of DCs and CD8+ T cells, representing the main cell type activated by cDC1s. Taken together, these findings support a unique role of cDC1s in PAH pathogenesis, independent of general immune activation or a mutation in the gene.
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http://dx.doi.org/10.3390/ijms22041756DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7916474PMC
February 2021

Tnfaip3 expression in pulmonary conventional type 1 Langerin-expressing dendritic cells regulates T helper 2-mediated airway inflammation in mice.

Allergy 2020 10 14;75(10):2587-2598. Epub 2020 Jun 14.

Department of Pulmonary Medicine, Erasmus MC, Rotterdam, The Netherlands.

Background: Conventional type 1 dendritic cells (cDC1s) control anti-viral and anti-tumor immunity by inducing antigen-specific cytotoxic CD8 T-cell responses. Controversy exists whether cDC1s also control CD4 T helper 2 (Th2) cell responses, since suppressive and activating roles have been reported. DC activation status, controlled by the transcription factor NF-κB, might determine the precise outcome of Th-cell differentiation upon encounter with cDC1s. To investigate the role of activated cDC1s in Th2-driven immune responses, pulmonary cDC1s were activated by targeted deletion of A20/Tnfaip3, a negative regulator of NF-κB signaling.

Methods: To target pulmonary cDC1s, Cd207 (Langerin)-mediated excision of A20/Tnfaip3 was used, generating Tnfaip3 xCd207 (Tnfaip3 ) mice. Mice were exposed to house dust mite (HDM) to provoke Th2-mediated immune responses.

Results: Mice harboring Tnfaip3-deficient cDC1s did not develop Th2-driven eosinophilic airway inflammation upon HDM exposure, but rather showed elevated numbers of IFNγ-expressing CD8 T cells. In addition, Tnfaip3 mice harbored increased numbers of IL-12-expressing cDC1s and elevated PD-L1 expression in all pulmonary DC subsets. Blocking either IL-12 or IFNγ in Tnfaip3 mice restored Th2 responses, whereas administration of recombinant IFNγ during HDM sensitization in C57Bl/6 mice blocked Th2 development.

Conclusions: These findings indicate that the activation status of cDC1s, shown by their specific expression of co-inhibitory molecules and cytokines, critically contributes to the development of Th2 cell-mediated disorders, most likely by influencing IFNγ production in CD8 T cells.
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http://dx.doi.org/10.1111/all.14334DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7687104PMC
October 2020

Dendritic Cell Subsets and Effector Function in Idiopathic and Connective Tissue Disease-Associated Pulmonary Arterial Hypertension.

Front Immunol 2019 22;10:11. Epub 2019 Jan 22.

Department of Pulmonary Medicine, Erasmus MC, Rotterdam, Netherlands.

Pulmonary arterial hypertension (PAH) is a cardiopulmonary disease characterized by an incurable condition of the pulmonary vasculature, leading to increased pulmonary vascular resistance, elevated pulmonary arterial pressure resulting in progressive right ventricular failure and ultimately death. PAH has different underlying causes. In approximately 30-40% of the patients no underlying risk factor or cause can be found, so-called idiopathic PAH (IPAH). Patients with an autoimmune connective tissue disease (CTD) can develop PAH [CTD-associated PAH (CTD-PAH)], suggesting a prominent role of immune cell activation in PAH pathophysiology. This is further supported by the presence of tertiary lymphoid organs (TLOs) near pulmonary blood vessels in IPAH and CTD-PAH. TLOs consist of myeloid cells, like monocytes and dendritic cells (DCs), T-cells, and B-cells. Next to their T-cell activating function, DCs are crucial for the preservation of TLOs. Multiple DC subsets can be found in steady state, such as conventional DCs (cDCs), including type 1 cDCs (cDC1s), and type 2 cDCs (cDC2s), AXLSiglec6 DCs (AS-DCs), and plasmacytoid DCs (pDCs). Under inflammatory conditions monocytes can differentiate into monocyte-derived-DCs (mo-DCs). DC subset distribution and activation status play an important role in the pathobiology of autoimmune diseases and most likely in the development of IPAH and CTD-PAH. DCs can contribute to pathology by activating T-cells (production of pro-inflammatory cytokines) and B-cells (pathogenic antibody secretion). In this review we therefore describe the latest knowledge about DC subset distribution, activation status, and effector functions, and polymorphisms involved in DC function in IPAH and CTD-PAH to gain a better understanding of PAH pathology.
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http://dx.doi.org/10.3389/fimmu.2019.00011DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6349774PMC
December 2019

TNF-α-induced protein 3 levels in lung dendritic cells instruct T2 or T17 cell differentiation in eosinophilic or neutrophilic asthma.

J Allergy Clin Immunol 2018 05 6;141(5):1620-1633.e12. Epub 2017 Sep 6.

Department of Pulmonary Medicine, Erasmus MC, Rotterdam, The Netherlands. Electronic address:

Background: It is currently unknown why allergen exposure or environmental triggers in patients with mild-to-moderate asthma result in T2-mediated eosinophilic inflammation, whereas patients with severe asthma often present with T17-mediated neutrophilic inflammation. The activation state of dendritic cells (DCs) is crucial for both T2 and T17 cell differentiation and is mediated through nuclear factor κB activation. Ablation of TNF-α-induced protein 3 (TNFAIP3), one of the crucial negative regulators of nuclear factor κB activation in myeloid cells and DCs, was shown to control DC activation.

Objective: In this study we investigated the precise role of TNFAIP3 in myeloid cells for the development of T2- and T17-cell mediated asthma.

Methods: We exposed mice with conditional deletion of the Tnfaip3 gene in either myeloid cells (by using the lysozyme M [LysM] promotor) or specifically in DCs (by using the Cd11c promotor) to acute and chronic house dust mite (HDM)-driven asthma models.

Results: We demonstrated that reduced Tnfaip3 gene expression in DCs in either Tnfaip3 or Tnfaip3 mice dose-dependently controlled development of T17-mediated neutrophilic severe asthma in both acute and chronic HDM-driven models, whereas wild-type mice had a purely T2-mediated eosinophilic inflammation. TNFAIP3-deficient DCs induced HDM-specific T17 cell differentiation through increased expression of the T17-instructing cytokines IL-1β, IL-6, and IL-23, whereas HDM-specific T2 cell differentiation was hampered by increased IL-12 and IL-6 production.

Conclusions: These data show that the extent of TNFAIP3 expression in DCs controls T2/T17 cell differentiation. This implies that reducing DC activation could be a new pharmacologic intervention to treat patients with severe asthma who present with T17-mediated neutrophilic inflammation.
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http://dx.doi.org/10.1016/j.jaci.2017.08.012DOI Listing
May 2018