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Vascular receptor autoantibodies in pulmonary arterial hypertension associated with systemic sclerosis.

Abstract：

RATIONALE:Systemic sclerosis (SSc)-associated pulmonary arterial hypertension (PAH) portends worse outcome than other forms of PAH. Vasoconstrictive and vascular remodeling actions of endothelin (ET) 1 and angiotensin (Ang) II via endothelin receptor type A (ETAR) and Ang receptor type-1 (AT1R) activation are implicated in PAH pathogenesis. OBJECTIVES:We hypothesized that stimulating autoantibodies (Abs) targeting and activating AT1R and ETAR may contribute to SSc-PAH pathogenesis, and tested their functional and biomarker relevance. METHODS:Anti-AT1R and -ETAR Abs were detected by ELISA in different cohorts of patients and tested in vitro and in an animal model for their pathophysiological effects. MEASUREMENTS AND MAIN RESULTS:The Abs were significantly higher and more prevalent in patients with SSc-PAH (n = 81) and connective tissue disease-associated PAH (n = 110) compared with other forms of PAH/pulmonary hypertension (n = 106). High anti-AT1R and anti-ETAR Abs predicted development of SSc-PAH and SSc-PAH-related mortality in a prospective analysis. Both Abs increased endothelial cytosolic Ca(2+) concentrations in isolated perfused rat lungs, which could be blocked by respective specific receptor antagonists. Ab-mediated stimulation of intralobar pulmonary rat artery ring segments increased vasoconstrictive responses to Ang II and ET-1, and implicated cross-talk between both pathways demonstrated by reciprocal blockade with respective antagonists. Transfer of SSc-IgG containing both autoantibodies into healthy C57BL/6J mice led to more abundant vascular and airway α-smooth muscle actin expression and inflammatory pulmonary vasculopathy. CONCLUSIONS:Anti-AT1R and -ETAR Abs are more frequent in SSc-PAH/connective tissue disease-PAH compared with other forms of pulmonary hypertension, and serve as predictive and prognostic biomarkers in SSc-PAH. Both antibodies may contribute to SSc-PAH via increased vascular endothelial reactivity and induction of pulmonary vasculopathy.

journal_name

Am J Respir Crit Care Med

journal_title

American journal of respiratory and critical care medicine

authors

Becker MO,Kill A,Kutsche M,Guenther J,Rose A,Tabeling C,Witzenrath M,Kühl AA,Heidecke H,Ghofrani HA,Tiede H,Schermuly RT,Nickel N,Hoeper MM,Lukitsch I,Gollasch M,Kuebler WM,Bock S,Burmester GR,Dragun D,Riemekasten

doi

10.1164/rccm.201403-0442OC

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

808-17

issue

eissn

1073-449X

issn

1535-4970

journal_volume

190

pub_type

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Vascular receptor autoantibodies in pulmonary arterial hypertension associated with systemic sclerosis.