Tel.: 514-340-8222
Dr. David Langleben

Senior Investigator, Lady Davis Institute
Professor of Medicine, McGill University
Director, Cardiology Division, Jewish General Hospital
Director, Centre for Pulmonary Vascular Disease
Dr. David Langleben is a Professor of Medicine at McGill University. He is the Director of the Cardiology Division of the Jewish General Hospital, and founded and directs the Centre for Pulmonary Vascular Disease, an internationally recognized resource for patient care, teaching, and research. He is a Project Director at the Lady Davis Institute for Medical Research.
Dr. Langleben’s research focuses on the vascular biology of pulmonary hypertension. He has studied endothelial dysfunction in the disorder, at the cellular, organ, and whole-body level. He and his colleagues were the first to identify endothelin-1 as a mediator in pulmonary hypertension. Over the following 20 years, this discovery led to the development of several approved therapies that have benefitted thousands of patients. His group has gone on to study the clearance of endothelin-1 in pulmonary hypertension and to examine mechanisms that control its synthesis. Recent work has focused on the effects of bone morphogenic proteins and other members of the transforming growth factor-β family of molecules on the control of endothelin-1 production.

Another major focus has been to measure the degree of loss of lung microvessels in pulmonary hypertension and to assess its impact on prognosis, response to therapy, and exercise capacity. With his colleagues, he has adapted for human use techniques originally developed for animal experiments. These human studies have provided definitive assessments of the restricted pulmonary bed in pulmonary hypertension and have provided the first mechanistic insights for the physiologic abnormalities in the disease. Current studies are examining changes in vascular surface area in response to vasodilators, and studies in exercising patients will begin shortly.
At the Centre for Pulmonary Vascular Disease, Dr. Langleben is the principal investigator in many clinical trials of novel therapies for pulmonary hypertension. He sits on several scientific advisory boards that design and direct major international clinical trials.

Major Research Activities
- Studying the control of endothelin-1 production by pulmonary microvascular endothelial cells in conditions simulating pulmonary hypertension.

- Measuring pulmonary vascular surface area in pulmonary hypertension and studying the effects of exercise and medications.

- Measuring novel mediators in pulmonary hypertension and studying factors that affect clinical outcomes.

Recent Publications
Langleben D, Orfanos SE, Giovinazzo M, Hirsch A, Baron M, Senecal JL, Armaganidis A, Catravas JD. Pulmonary capillary endothelial dysfunction: Severity in pulmonary arterial hypertension related to connective tissue disease versus idiopathic pulmonary arterial hypertension. Arthr Rheumatism 2008;58:1156-1164.

Star GP, Giovinazzo M, Langleben D. Bone morphogenic protein-9 stimulates endothelin-1 release from human pulmonary microvascular endothelial cells. A potential mechanism for elevated ET-1 levels in pulmonary arterial hypertension. Microvasc Res 2010;80:349-354.

Fox BD, Shimony A, Langleben D. Meta-analysis of monotherapy vs. combination therapy for pulmonary arterial hypertension. Am J Cardiol 2011; in press.

Dr. David Langleben is an internationally recognized clinician scientist in the area of lung circulation and pulmonary hypertension.

He and his co-workers identified endothelin-1 as a novel mediator of pulmonary hypertension, resulting in effective therapy for thousands of patients. His research has led to understanding endothelin-1’s role in the disease, and has provided insights into the control of its production. Dr. Langleben has described the first true measurements of lung vascular surface area in patients with pulmonary hypertension.

His lab focuses on understanding endothelial cell dysfunction in pulmonary hypertension, and on studying functional pulmonary vascular surface area in the disease. 

At the Centre for Pulmonary Vascular Disease, in addition to clinical research on novel therapies, he is measuring novel mediators in pulmonary hypertension, studying the effects of therapy on vascular surface area, and measuring physiologic parameters in his patients.

Important Links

Support research at the Lady Davis Institute - Jewish General Hospital