PMID: 9003800Jan 13, 1997Paper

Induction of nuclear factor kappaB and activation protein 1 in postischemic myocardium

FEBS Letters
B Chandrasekar, G L Freeman

Abstract

Ischemia/reperfusion induces nuclear factor kappaB (NF-kappaB) and AP-1 in rat hearts after 15 min of ischemia followed by reperfusion (R) for various periods of time (15 and 30 min, 1, 2, 3, 6, 12, and 24 h). Low levels of NF-kappaB and no signal for AP-1 were detected in shams and in non-ischemic tissue distant from the ischemic zone. In postischemic tissue, NF-kappaB levels increased biphasically with peak levels at 15 min and again at 3 h R. Immunoblotting showed minimal NF-kappaB p50 subunit at all times, with changes in p65 similar to EMSA results. Northern blots showed low p50 and increased p65 expression levels at both 2 and 3 h R. By contrast, AP-1 increased monophasically, with peak levels at 15 min R, which dropped steadily thereafter. These results indicate that NF-kappaB and AP-1 are differentially regulated during reperfusion, which may be a control mechanism for gene expression in reperfused myocardium.

Citations

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