학술논문
Sotatercept analog suppresses inflammation to reverse experimental pulmonary arterial hypertension
Document Type
Original Paper
Author
Joshi, Sachindra R.; Liu, Jun; Bloom, Troy; Karaca Atabay, Elif; Kuo, Tzu-Hsing; Lee, Michael; Belcheva, Elitza; Spaits, Matthew; Grenha, Rosa; Maguire, Michelle C.; Frost, Jeffrey L.; Wang, Kathryn; Briscoe, Steven D.; Alexander, Mark J.; Herrin, Brantley R.; Castonguay, Roselyne; Pearsall, R. Scott; Andre, Patrick; Yu, Paul B.; Kumar, Ravindra; Li, Gang
Source
Scientific Reports. 12(1)
Subject
Language
English
ISSN
2045-2322
Abstract
Sotatercept is an activin receptor type IIA-Fc (ActRIIA-Fc) fusion protein that improves cardiopulmonary function in patients with pulmonary arterial hypertension (PAH) by selectively trapping activins and growth differentiation factors. However, the cellular and molecular mechanisms of ActRIIA-Fc action are incompletely understood. Here, we determined through genome-wide expression profiling that inflammatory and immune responses are prominently upregulated in the lungs of a Sugen-hypoxia rat model of severe angio-obliterative PAH, concordant with profiles observed in PAH patients. Therapeutic treatment with ActRIIA-Fc—but not with a vasodilator—strikingly reversed proinflammatory and proliferative gene expression profiles and normalized macrophage infiltration in diseased rodent lungs. Furthermore, ActRIIA-Fc normalized pulmonary macrophage infiltration and corrected cardiopulmonary structure and function in Bmpr2 haploinsufficient mice subjected to hypoxia, a model of heritable PAH. Three high-affinity ligands of ActRIIA-Fc each induced macrophage activation in vitro, and their combined immunoneutralization in PAH rats produced cardiopulmonary benefits comparable to those elicited by ActRIIA-Fc. Our results in complementary experimental and genetic models of PAH reveal therapeutic anti-inflammatory activities of ActRIIA-Fc that, together with its known anti-proliferative effects on vascular cell types, could underlie clinical activity of sotatercept as either monotherapy or add-on to current PAH therapies.