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Am J Physiol Lung Cell Mol Physiol 278: L1045-L1050, 2000;
1040-0605/00 $5.00
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Vol. 278, Issue 5, L1045-L1050, May 2000

TRAIL expression in vascular smooth muscle

Bernadette R. Gochuico, Jie Zhang, Bei Yang Ma, Ann Marshak-Rothstein, and Alan Fine

Pulmonary Center and Department of Microbiology, Boston University School of Medicine, Boston, Massachusetts 02118

TRAIL is a cell-associated tumor necrosis factor-related apoptosis-inducing ligand originally identified in immune cells. The ligand has the capacity to induce apoptosis after binding to cell surface receptors. To examine TRAIL expression in murine vascular tissue, we employed in situ hybridization and immunohistochemistry. In these studies, we found that TRAIL mRNA and protein were specifically localized throughout the medial smooth muscle cell layer of the pulmonary artery. Notably, a similar pattern of expression was observed in the mouse aorta. Consistent with these findings, we found that cultures of primary human aorta and pulmonary artery smooth muscle cells express abundant TRAIL mRNA and protein. We also found that these cells and endothelial cells undergo cell lysis in response to exogenous addition of TRAIL. Last, we confirmed that TRAIL specifically activated a death program by confirming poly(ADP ribose) polymerase cleavage. Overall, we believe that these findings are relevant to understanding the factors that regulate cell turnover in the vessel wall.

apoptosis; smooth muscle cell; endothelial cell; tumor necrosis factor-related apoptosis-inducing ligand


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