Endocannabinoid Anandamide Mediates Hypoxic Pulmonary Vasoconstriction

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2013 Oct 30

PMID 24167249

Citations 27

Authors

Daniela Wenzel

Michaela Matthey

Laura Bindila

Raissa Lerner

Beat Lutz

Andreas Zimmer

Bernd K Fleischmann

Affiliations

Soon will be listed here.

Abstract

Endocannabinoids are important regulators of organ homeostasis. Although their role in systemic vasculature has been extensively studied, their impact on pulmonary vessels remains less clear. Herein, we show that the endocannabinoid anandamide (AEA) is a key mediator of hypoxic pulmonary vasoconstriction (HPV) via fatty acid amide hydrolase (FAAH)-dependent metabolites. This is underscored by the prominent vasoconstrictive effect of AEA on pulmonary arteries and strongly reduced HPV in FAAH(-/-) mice and wild-type mice upon pharmacological treatment with FAAH inhibitor URB597. In addition, mass spectrometry measurements revealed a clear increase of AEA and the FAAH-dependent metabolite arachidonic acid in hypoxic lungs of wild-type mice. We have identified pulmonary vascular smooth muscle cells as the source responsible for hypoxia-induced AEA generation. Moreover, either FAAH(-/-) mice or wild-type mice treated with FAAH inhibitor URB597 are protected against hypoxia-induced pulmonary hypertension and the concomitant vascular remodeling in the lung. Thus, the AEA/FAAH pathway is an important mediator of HPV and is involved in the generation of pulmonary hypertension.

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