Ischemic Preconditioning Attenuates Postischemic Leukocyte - Endothelial Cell Interactions Role of Nitric Oxide and Protein Kinase C

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  • Huang Shiang-Suo
    Department of Pharmacology and Institute of Medicine, College of Medicine, Chung Shan Medical University
  • Wei Fu-Chan
    Plastic & Reconstructive Surgery, College of Medicine, Chang Gung University, Chang Gung Memorial Hospital
  • Hung Li-Man
    Plastic & Reconstructive Surgery, College of Medicine, Chang Gung University, Chang Gung Memorial Hospital Department of Life Science, College of Medicine, Chang Gung University, Chang Gung Memorial Hospital

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  • Role of Nitric Oxide and Protein Kinase C

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Background Ischemic preconditioning (IPC) produces immediate tolerance to subsequent prolonged ischemia/reperfusion (I/R), although the underlying mechanism remains unknown. The purpose of this study was to examine the role of nitric oxide (NO) and protein kinase C (PKC) in IPC-attenuated post ischemic leukocyte - endothelium interactions. Methods and Results Male Sprague-Dawley rats were randomized (n=8 per group) into 5 groups: sham-operated control group, IPC group, I/R group (4 h of pubic epigastric artery ischemia followed by 2 h of reperfusion), IPC + I/R group (30 min of ischemia followed by 30 min of reperfusion before I/R), and chelerythrine (PKC inhibitor) + IPC + I/R group. Intravital microscopy was used to observe leukocyte - endothelium interaction and to quantify functional capillaries in rat cremaster muscle flaps. The mRNA expressions of neuronal (n) NO synthase (NOS), inducible (i) NOS, and endothelial (e) NOS were determined by reverse transcription-polymerase chain reaction. The results showed that besides increasing functional capillary density, IPC also prevents I/R-induced increases in leukocyte rolling, adhesion, and migration. In the chelerythrine + IPC + I/R group, the IPC protective action was inhibited by the addition of chelerythrine. It was also observed that IPC upregulated nNOS, iNOS, and eNOS mRNA in I/R injured tissue, but this effect was not blocked by chelerythrine. Furthermore, specifically pretreated nNOS and iNOS inhibitors, along with a nonselective NOS inhibitor, were used in the IPC + I/R group to examine their possible antagonistic effects on leukocyte - endothelium interactions. Inhibition of the nNOS and iNOS activities did not block the beneficial effects of IPC. In contrast, pretreatment with the nonselective NOS inhibitor (NG-nitro-L-arginine methylester) in the IPC + I/R group almost completely blocked the protective effect of IPC. Conclusions Both NOS and PKC play a protective role during IPC, but probably in distinct ways. Furthermore, the results also indicate that eNOS, but not nNOS nor iNOS, is the key mediator of IPC-attenuated I/R-induced microcirculatory disturbance. (Circ J 2006; 70: 1070 - 1075)<br>

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  • Circulation Journal

    Circulation Journal 70 (8), 1070-1075, 2006

    一般社団法人 日本循環器学会

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