Expression of cell adhesion molecule T-cadherin in the human vasculature

Histochemistry and Cell Biology
D IvanovV Tkachuk

Abstract

Alterations in expression of surface adhesion molecules on resident vascular and blood-derived cells play a fundamental role in the pathogenesis of cardiovascular disease. Smooth muscle cells (SMCs) have been shown to express T-cadherin (T-cad), an unusual GPI-anchored member of the cadherin family of adhesion molecules. Particular relevance for T-cad in cardiovascular tissues is indicated by our present screen (immunoblotting) of human tissues and organs whereby highest expression of T-cad was found in aorta, carotid, iliac and renal arteries and heart. To explore the (patho)physiological role for T-cad in the vasculature we performed an immunohistochemical analysis of T-cad expression in normal human aorta and atherosclerotic lesions of varying severity. T-cad was present both in the intima and media and was expressed in endothelial cells (ECs), SMCs and pericytes, but not in monocytes/macrophages, foam cells and lymphocytes. In the adventitia T-cad was present in the wall of vasa vasorum and was expressed in ECs, SMCs and pericytes. T-cad was differentially expressed in SMCs from distinct vascular layers of normal aorta (for example, high in the subendothelial (proteoglycan) layer of the intima, low in the musculoelastic int...Continue Reading

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