Role of apoptosis in pulmonary hypertension: from experimental models to clinical trials

Pharmacology & Therapeutics
Paul JuraszD J Stewart

Abstract

Pulmonary arterial hypertension (PAH) is a progressive and lethal disease that has a strong female predominance, often affecting the young. Current therapies are mostly vasodilator agents, and while mainly addressing the endothelial dysfunction that has been widely reported in this disease, they may be less effective in treating arterial remodeling. The lung pathology of PAH is characterized by medial hypertrophy and intimal hyperplasia of muscular arteries as well as plexiform lesions, that lead to a widespread narrowing or obliteration of the pulmonary arteriolar bed. However, the pathogenesis of the functional and structural abnormalities of the lung microcirculation in PAH is poorly understood. Perhaps the greatest advancement in the last decade has been the discovery of the "PAH gene," bone morphogenetic receptor 2 (Bmpr2), however how the loss-of-function mutations in Bmpr2 lead to PAH is unclear. The BMPR2 pathway has recently been shown to mediate survival signaling in endothelial cells (EC), and thus the reduced activity will favor endothelial apoptosis, likely increasing the susceptibility to endothelial injury in response to various environmental triggers. EC apoptosis has been implicated as an initiating event in ex...Continue Reading

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Citations

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