Pro-proliferative and inflammatory signaling converge on FoxO1 transcription factor in pulmonary hypertension.

Abstract:

:Pulmonary hypertension (PH) is characterized by increased proliferation and apoptosis resistance of pulmonary artery smooth muscle cells (PASMCs). Forkhead box O (FoxO) transcription factors are key regulators of cellular proliferation. Here we show that in pulmonary vessels and PASMCs of human and experimental PH lungs, FoxO1 expression is downregulated and FoxO1 is inactivated via phosphorylation and nuclear exclusion. These findings could be reproduced using ex vivo exposure of PASMCs to growth factors and inflammatory cytokines. Pharmacological inhibition and genetic ablation of FoxO1 in smooth muscle cells reproduced PH features in vitro and in vivo. Either pharmacological reconstitution of FoxO1 activity using intravenous or inhaled paclitaxel, or reconstitution of the transcriptional activity of FoxO1 by gene therapy, restored the physiologically quiescent PASMC phenotype in vitro, linked to changes in cell cycle control and bone morphogenic protein receptor type 2 (BMPR2) signaling, and reversed vascular remodeling and right-heart hypertrophy in vivo. Thus, PASMC FoxO1 is a critical integrator of multiple signaling pathways driving PH, and reconstitution of FoxO1 activity offers a potential therapeutic option for PH.

journal_name

Nat Med

journal_title

Nature medicine

authors

Savai R,Al-Tamari HM,Sedding D,Kojonazarov B,Muecke C,Teske R,Capecchi MR,Weissmann N,Grimminger F,Seeger W,Schermuly RT,Pullamsetti SS

doi

10.1038/nm.3695

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

1289-300

issue

11

eissn

1078-8956

issn

1546-170X

pii

nm.3695

journal_volume

20

pub_type

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