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Cell Metab. 2015 Apr 7;21(4):596-608. doi: 10.1016/j.cmet.2015.03.010.

BMPR2 preserves mitochondrial function and DNA during reoxygenation to promote endothelial cell survival and reverse pulmonary hypertension.

Author information

1
Department of Pediatrics and Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA; The Vera Moulton Wall Center for Pulmonary Vascular Disease, Stanford University School of Medicine, Stanford, CA 94305, USA.
2
Department of Pediatrics and Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.
3
Department of Medicine, Weill Cornell Medical College, New York, NY 10065, USA.
4
Department of Pediatrics and Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA; The Vera Moulton Wall Center for Pulmonary Vascular Disease, Stanford University School of Medicine, Stanford, CA 94305, USA. Electronic address: marlener@stanford.edu.

Abstract

Mitochondrial dysfunction, inflammation, and mutant bone morphogenetic protein receptor 2 (BMPR2) are associated with pulmonary arterial hypertension (PAH), an incurable disease characterized by pulmonary arterial (PA) endothelial cell (EC) apoptosis, decreased microvessels, and occlusive vascular remodeling. We hypothesized that reduced BMPR2 induces PAEC mitochondrial dysfunction, promoting a pro-inflammatory or pro-apoptotic state. Mice with EC deletion of BMPR2 develop hypoxia-induced pulmonary hypertension that, in contrast to non-transgenic littermates, does not reverse upon reoxygenation and is associated with reduced PA microvessels and lung EC p53, PGC1α and TFAM, regulators of mitochondrial biogenesis, and mitochondrial DNA. Decreasing PAEC BMPR2 by siRNA during reoxygenation represses p53, PGC1α, NRF2, TFAM, mitochondrial membrane potential, and ATP and induces mitochondrial DNA deletion and apoptosis. Reducing PAEC BMPR2 in normoxia increases p53, PGC1α, TFAM, mitochondrial membrane potential, ATP production, and glycolysis, and induces mitochondrial fission and a pro-inflammatory state. These features are recapitulated in PAECs from PAH patients with mutant BMPR2.

PMID:
25863249
PMCID:
PMC4394191
DOI:
10.1016/j.cmet.2015.03.010
[Indexed for MEDLINE]
Free PMC Article

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