Nitroglycerin induces late preconditioning against myocardial stunning via a PKC-dependent pathway

Supratim Banerjee, Xian Liang Tang, Yumin Qiu, Hitoshi Takano, Srinivas Manchikalapudi, Buddhadeb Dawn, Gregg Shirk, Roberto Bolli

Research output: Contribution to journalArticlepeer-review

Abstract

Previous studies have shown that administration of nitric oxide (NO) donors induces a delayed cardioprotective effect indistinguishable from the late phase of ischemic preconditioning (PC). However, the ability of clinically relevant NO donors to elicit this phenomenon has not been evaluated. In this study we tested whether an NO-releasing agent that is nitroglycerin (NTG), which is widely used clinically, can mimic the late phase of ischemic PC. Four groups of conscious rabbits underwent six cycles of 4-min occlusion (O)/4-min reperfusion (R) for 3 consecutive days (days 1, 2, and 3). The severity of myocardial stunning was assessed as the total deficit of systolic wall thickening (WTh) after the last O/R cycle. In the control group (group I, n = 6), the total deficit of WTh was reduced by 50% and 51% on days 2 and 3 vs. day 1, respectively, indicating late PC against stunning. Pretreatment with NTG (2 μg · kg-1 · min-1 iv over 1 h) on day 0 (group H, n = 6) was as effective as ischemic PC in mitigating myocardial stunning 24 h later (day 1); on days 2 and 3, no further reduction of stunning was seen. Coadministration of the PKC inhibitor chelerythrine (5 mg/kg) with NTG (group III, n = 6) completely abrogated the NTG-induced protection. Pretreatment with chelerythrine alone (group IV, n = 5) did not alter stunning. These results demonstrate that a relatively brief infusion of NTG induces a robust protective effect against stunning 24 h later via a protein kinase C (PKC)-dependent signaling mechanism. The magnitude of NTG- induced protection is equivalent to that observed during the late phase of ischemic PC. Late PC induced by brief treatment with NTG could be a useful therapeutic strategy for myocardial protection in patients with ischemic heart disease.

Original languageEnglish (US)
Pages (from-to)H2488-H2494
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume277
Issue number6 46-6
DOIs
StatePublished - Dec 1999

Keywords

  • Myocardial ischemia-reperfusion
  • Nitrates
  • Nitric oxide
  • Protein kinase C

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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