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TNF alpha down-regulates CD105 expression in vascular endothelial cells: a comparative study with TGF beta 1. | LitMetric

AI Article Synopsis

Article Abstract

The vascular endothelium participates in angiogenesis, inflammation and the immune response, which are modulated by vasoactive cytokines such as tumour necrosis factor-alpha (TNF alpha) and transforming growth factor-beta 1 (TGF beta 1). CD105 is a component of the TGF beta receptor complex and is abundantly expressed in activated/injured endothelium where it is implicated in multiple cellular processes. Up-regulation of CD105 in synovial cells of rheumatoid arthritis and psoriatic lesions implies a possible role in the pathogenesis of such inflammatory disorders. The pro-inflammatory cytokine, TNF alpha, and anti-inflammatory cytokine, TGF beta 1, regulate multiple cellular processes such as proliferation, differentiation and apoptosis. Our hypothesis is that CD105 gene expression in endothelial cells is regulated by the multifunctional cytokines TNF alpha and TGF beta 1. By using human dermal microvascular endothelial cells the present study has shown that long-term treatment with TNF alpha (0.1-5 ng/ml) elicited a concentration- and time-dependent significant suppression (over 50% reduction) in CD105 protein levels. The observations that no significant alterations in the CD105 mRNA levels or in the CD105 promoter activity were found and that the potent inhibitor of NF kappa B, PDTC, did not affect the TNF alpha action suggest that CD105 down-regulation by TNF alpha is not at the transcriptional level. In contrast to TNF alpha, TGF beta 1 significantly elevated CD105 protein and mRNA expression (approximately 2-fold increase) through activation of its promoter activity. From these data we conclude that TNF alpha and TGF beta 1 exert opposing effects on CD105 expression in human vascular endothelial cells and that CD105 is enmeshed in the network of signal pathways modulating multiple cellular functions.

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