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J Am Coll Cardiol, 2004; 43:13-24
© 2004 by the American College of Cardiology Foundation
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Cellular and molecular pathobiology of pulmonary arterial hypertension

Marc Humbert, MD, PhD*,*, Nicholas W. Morrell, MD{dagger}, Stephen L. Archer, MD{ddagger}, Kurt R. Stenmark, MD§, Margaret R. MacLean, Bsc, PhD||, Irene M. Lang, MD, Brian W. Christman, MD, E. Kenneth Weir, MD**, Oliver Eickelberg, MD{dagger}{dagger}, Norbert F. Voelkel, MD{ddagger}{ddagger} and Marlene Rabinovitch, MD§§

* Service de Pneumologie et Réanimation Respiratoire, Centre des Maladies Vasculaires Pulmonaires, UPRES EA2705, Hôpital Antoine-Béclère, Université Paris-Sud, Clamart, France
{dagger} Respiratory Medicine Unit, Department of Medicine, University of Cambridge School of Clinical Medicine, Addenbrooke's Hospital, Cambridge, United Kingdom
{ddagger} Vascular Biology Group and Pulmonary Hypertension Program, Department of Medicine (Cardiology), University of Alberta, Edmonton, Alberta, Canada
§ Development Lung Biology Research, University of Colorado Health Sciences Center, Denver, Colorado, USA
|| Division of Biomedical and Life Sciences, Institute of Biomedical and Life Sciences, Glasgow University, Glasgow, United Kingdom
Department of Cardiology, University of Vienna, Vienna, Austria
Center for Lung Research, Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
** Department of Medicine, Veterans Affairs Medical Center, Minneapolis, Minnesota, USA
{dagger}{dagger} Department of Internal Medicine, Justus-Liebig University, Giessen, Germany
{ddagger}{ddagger} Pulmonary Hypertension Center, University of Colorado Health Sciences Center, Denver, Colorado, USA
§§ Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA

Manuscript received January 7, 2004; accepted February 3, 2004.

* Reprint requests and correspondence: Dr. Marc Humbert, Service de Pneumologie, Hôpital Antoine-Béclère, 157, Rue de la Porte de Trivaux, 92140 Clamart, France.
humbert{at}ipsc.u-psud.fr

Pulmonary arterial hypertension (PAH) has a multifactorial pathobiology. Vasoconstriction, remodeling of the pulmonary vessel wall, and thrombosis contribute to increased pulmonary vascular resistance in PAH. The process of pulmonary vascular remodeling involves all layers of the vessel wall and is complicated by cellular heterogeneity within each compartment of the pulmonary arterial wall. Indeed, each cell type (endothelial, smooth muscle, and fibroblast), as well as inflammatory cells and platelets, may play a significant role in PAH. Pulmonary vasoconstriction is believed to be an early component of the pulmonary hypertensive process. Excessive vasoconstriction has been related to abnormal function or expression of potassium channels and to endothelial dysfunction. Endothelial dysfunction leads to chronically impaired production of vasodilators such as nitric oxide and prostacyclin along with overexpression of vasoconstrictors such as endothelin (ET)-1. Many of these abnormalities not only elevate vascular tone and promote vascular remodeling but also represent logical pharmacological targets. Recent genetic and pathophysiologic studies have emphasized the relevance of several mediators in this condition, including prostacyclin, nitric oxide, ET-1, angiopoietin-1, serotonin, cytokines, chemokines, and members of the transforming-growth-factor-beta superfamily. Disordered proteolysis of the extracellular matrix is also evident in PAH. Future studies are required to find which if any of these abnormalities initiates PAH and which ones are best targeted to cure the disease.

Abbreviations and Acronyms
  BMP = bone morphogenetic proteins
  ET = endothelin
  5-HT = 5-hydroxytryptamine
  NO = nitric oxide
  PAH = pulmonary arterial hypertension
  TGF-ß = transforming growth factor-beta
  TGF-ßR2 = transforming growth factor-beta type-2 receptor
  VEGF = vascular endothelial growth factor
  VIP = vasoactive intestinal peptide




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