Expression and regulation of adhesion molecules in cardiac cells by cytokines: response to acute hypoxia

Circulation Research
R KacimiC S Long

Abstract

Adhesion molecules mediate inflammatory myocardial injury after ischemia/reperfusion. Cytokine release and hypoxia are features of acute ischemia that may influence expression of these molecules. Accordingly, we studied intercellular adhesion molecule (ICAM) and vascular cell adhesion molecule (VCAM) responses to cytokines and acute hypoxia in cultured myocardial cells. Northern blot analysis and immunoassay showed that the proinflammatory cytokines interleukin-1beta (IL-1beta) and tumor necrosis factor-alpha stimulated concentration-dependent increases in ICAM and VCAM mRNA and protein. In both cardiac myocytes and fibroblasts, pretreatment with a specific inhibitor of nuclear transcription factor-kappaB (NF-kappaB) prevented cytokine induction of both molecules. We also found that inhibition of tyrosine kinase and p38/RK (stress-activated protein kinase) pathways prevented IL-1beta-induced ICAM and VCAM protein synthesis, whereas extracellular signal-regulated protein kinase (ERK1/ERK2) inhibition did not. Neither hypoxia (0% O2 for 6 hours) alone nor hypoxia/reoxygenation had any significant effect on ICAM and VCAM mRNA. However, hypoxia did enhance IL-1beta-induced ICAM mRNA expression in myocytes. As a possible mechanism o...Continue Reading

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