Phosphodiesterase 1 upregulation in pulmonary arterial hypertension: target for reverse-remodeling therapy.

Abstract:

BACKGROUND:Pulmonary arterial hypertension (PAH) is a life-threatening disease, characterized by vascular smooth muscle cell hyperproliferation. The calcium/calmodulin-dependent phosphodiesterase 1 (PDE1) may play a major role in vascular smooth muscle cell proliferation. METHODS AND RESULTS:We investigated the expression of PDE1 in explanted lungs from idiopathic PAH patients and animal models of PAH and undertook therapeutic intervention studies in the animal models. Strong upregulation of PDE1C in pulmonary arterial vessels in the idiopathic PAH lungs compared with healthy donor lungs was noted on the mRNA level by laser-assisted vessel microdissection and on the protein level by immunohistochemistry. In chronically hypoxic mouse lungs and lungs from monocrotaline-injected rats, PDE1A upregulation was detected in the structurally remodeled arterial muscular layer. Long-term infusion of the PDE1 inhibitor 8-methoxymethyl 3-isobutyl-1-methylxanthine in hypoxic mice and monocrotaline-injected rats with fully established pulmonary hypertension reversed the pulmonary artery pressure elevation, structural remodeling of the lung vasculature (nonmuscularized versus partially muscularized versus fully muscularized small pulmonary arteries), and right heart hypertrophy. CONCLUSIONS:Strong upregulation of the PDE1 family in pulmonary artery smooth muscle cells is noted in human idiopathic PAH lungs and lungs from animal models of PAH. Inhibition of PDE1 reverses structural lung vascular remodeling and right heart hypertrophy in 2 animal models. The PDE1 family may thus offer a new target for therapeutic intervention in pulmonary hypertension.

journal_name

Circulation

journal_title

Circulation

authors

Schermuly RT,Pullamsetti SS,Kwapiszewska G,Dumitrascu R,Tian X,Weissmann N,Ghofrani HA,Kaulen C,Dunkern T,Schudt C,Voswinckel R,Zhou J,Samidurai A,Klepetko W,Paddenberg R,Kummer W,Seeger W,Grimminger F

doi

10.1161/CIRCULATIONAHA.106.676809

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

2331-9

issue

17

eissn

0009-7322

issn

1524-4539

pii

CIRCULATIONAHA.106.676809

journal_volume

115

pub_type

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