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    BMPRII deficiency impairs apoptosis via the BMPRII-ALK1-BclX-mediated pathway in pulmonary arterial hypertension (PAH)

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    Nasim_Human_Molecular_Genetics.pdf (962.2Kb)
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    Publication date
    2019-07
    Author
    Chowdhury, H.M.
    Sharmin, N.
    Yuzbasioglu Baran, M.
    Long, L.
    Morrell, N.W.
    Trembath, R.C.
    Nasim, Md. Talat
    Keyword
    Pulmonary Arterial Hypertension (PAH)
    Bone morphogenetic protein (BMPRII)
    BMPRII deficiency
    Apoptosis
    Rights
    © The Author(s) 2019. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Human Molecular Genetics following peer review. The definitive publisher-authenticated version is available online at: https://doi.org/10.1093/hmg/ddz047.
    Peer-Reviewed
    Yes
    
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    Abstract
    Pulmonary Arterial Hypertension (PAH) is a devastating cardiovascular disorder characterised by the remodelling of pre-capillary pulmonary arteries. The vascular remodelling observed in PAH patients results from excessive proliferation and apoptosis resistance of pulmonary arterial smooth muscle (PASMCs) and endothelial cells (PAECs). We have previously demonstrated that mutations in the type II receptor for bone morphogenetic protein (BMPRII) underlie the majority of the familial and inherited forms of the disease. We have further demonstrated that BMPRII deficiency promotes excessive proliferation and attenuates apoptosis in PASMCs, but the underlying mechanisms remain unclear. The major objective of this study is to investigate how BMPRII deficiency impairs apoptosis in PAH. Using multidisciplinary approaches, we demonstrate that deficiency in the expression of BMPRII impairs apoptosis by modulating the alternative splicing of the apoptotic regulator, Bcl-x (B-cell lymphoma X) transcripts: a finding observed in circulating leukocytes and lungs of PAH subjects, hypoxia-induced PAH rat lungs as well as in PASMCs and PAECs. BMPRII deficiency elicits cell specific effects: promoting the expression of Bcl-xL transcripts in PASMCs whilst inhibiting it in ECs, thus exerting differential apoptotic effects in these cells. The pro-survival effect of BMPRII receptor is mediated through the activin receptor like kinase 1 (ALK1) but not the ALK3 receptor. Finally, we show that BMPRII interacts with the ALK1 receptor and pathogenic mutations in the BMPR2 gene abolish this interaction. Taken together, dysfunctional BMPRII responsiveness impairs apoptosis via the BMPRII-ALK1-Bcl-xL pathway in PAH. We suggest Bcl-xL as a potential biomarker and druggable target.
    URI
    http://hdl.handle.net/10454/16885
    Version
    Accepted manuscript
    Citation
    Chowdhury HM, Sharmin N, Yuzbasioglu Baran M et al (2019) BMPRII deficiency impairs apoptosis via the BMPRII-ALK1-BclX-mediated pathway in pulmonary arterial hypertension (PAH). Human Molecular Genetics. 28(13): 2161-2173.
    Link to publisher’s version
    https://doi.org/10.1093/hmg/ddz047
    Type
    Article
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    Life Sciences Publications

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