Nitric Oxide Protects Cardiac Sarcolemmal Membrane Enzyme Function and Ion Active Transport against Ischemia-induced Inactivation

Kai Y. Xu, Shanmuga P. Kuppusamy, Jing Q. Wang, Haiquan Li, Hongmei Cui, Ted M. Dawson, Paul L. Huang, Arthur L. Burnett, Periannan Kuppusamy, Lewis C. Becker

Research output: Contribution to journalArticlepeer-review

Abstract

Nitric oxide (NO.) generated from nitric oxide synthase (NOS) isoforms bound to cellular membranes may serve to modulate oxidative stresses in cardiac muscle and thereby regulate the function of key membrane-associated enzymes. Ischemia is known to inhibit the function of sarcolemmal enzymes, including the (Na+ + K+)-ATPase, but it is unknown whether concomitant injury to sarcolemma (SL)-associated NOS isoforms may contribute to this process by reducing the availability of locally generated NO.. Here we report that nNOS, as well as eNOS (SL NOSs), are tightly associated with cardiac SL membranes in several different species. In isolated perfused rat hearts, global ischemia caused a time-dependent irreversible injury to cardiac SL NOSs and a disruption of SL NO. generation. Pretreatment with low concentrations of the NO. donor 1-hydroxy-2-oxo-3-(N-3-methyl-aminopropyl)-3-methyl-1-triazene (NOC-7) markedly protected both SL NOS and (Na+ + K+)-ATPase functions against ischemia-induced inactivation. Moreover, ischemia impaired SL Na +/K+ binding, and NOC-7 significantly prevented ischemic injury to the ion binding sites on (Na+ + K+)-ATPase. These novel findings indicate that NO. can protect cardiac SL NOSs and (Na+ + K+)-ATPase against ischemia-induced inactivation and suggest that locally generated NO. may serve to regulate SL Na+/K+ ion active transport in the heart.

Original languageEnglish (US)
Pages (from-to)41798-41803
Number of pages6
JournalJournal of Biological Chemistry
Volume278
Issue number43
DOIs
StatePublished - Oct 24 2003

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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