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Endothelial cells can influence significantly the host inflammatory response against blood-borne microbial pathogens. Previously, we found that endothelial cells respond to in vitro infection with Candida albicans by secreting interleukin 8 (IL-8) and expressing E-selectin, intercellular adhesion molecule 1 (ICAM-1), and vascular cell adhesion molecule 1 (VCAM-1). We have now examined the mechanisms mediating this endothelial cell response. We determined that C. albicans stimulated endothelial cells to synthesize tumor necrosis factor alpha (TNF-alpha), which in turn induced these infected cells to secrete IL-8 and express E-selectin by an autocrine mechanism. Expression of VCAM-1 was mediated not only by TNF-alpha but also by IL-1alpha and IL-1beta, all of which were synthesized by endothelial cells in response to C. albicans. These three cytokines remained primarily cell associated rather than being secreted. Candidal induction of ICAM-1 expression was independent of TNF-alpha, IL-1alpha, and IL-1beta. These observations demonstrate that different proinflammatory endothelial cell responses to C. albicans are induced by distinct mechanisms. A clear understanding of these mechanisms is important for therapeutically modulating the endothelial cell response to C. albicans and perhaps other opportunistic pathogens that disseminate hematogenously.

Mechanisms of the Proinflammatory Response of Endothelial Cells toCandida albicansInfection