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J Appl Physiol 90: 2411-2419, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 6, 2411-2419, June 2001

Long-term effect of low energy laser irradiation on infarction and reperfusion injury in the rat heart

Tali Yaakobi1, Yariv Shoshany1, Sara Levkovitz1, Ofer Rubin1, Shlomo A. Ben Haim2, and Uri Oron1

1 Department of Zoology, The George S. Wise Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv 69978; and 2 Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 34362, Israel

Low-energy laser irradiation (LELI) has been found to modulate biological processes. The present study investigated the effect of LELI on infarct size after chronic myocardial infarction (MI) and ischemia-reperfusion injury in rats. The left anterior descending (LAD) coronary artery was ligated in 83 rats to create MI or ischemia-reperfusion injury. The hearts of the laser-irradiated (LI) rats received irradiation after LAD coronary artery occlusion and 3 days post-MI. At 14, 21, and 45 days post-LAD coronary artery permanent occlusion, infarct sizes (percentage of left ventricular volume) in the non-laser-irradiated (NLI) rats were 52 ± 12 (SD), 47 ± 11, and 34 ± 7%, respectively, whereas in the LI rats they were significantly lower, being 20 ± 8, 15 ± 6, and 10 ± 4%, respectively. Left ventricular dilatation (LVD) in the chronic infarcted rats was significantly reduced (50-60%) in LI compared with NLI rats. LVD in the ischemia-reperfusion-injured LI rats was significantly reduced to a value that did not differ from intact normal noninfarcted rats. Laser irradiation caused a significant 2.2-fold elevation in the content of inducible heat shock proteins (specifically HSP70i) and 3.1-fold elevation in newly formed blood vessels in the heart compared with NLI rats. It is concluded that LELI caused a profound reduction in infarct size and LVD in the rat heart after chronic MI and caused complete reduction of LVD in ischemic-reperfused heart. This phenomenon may be partially explained by the cardioprotective effect of the HSP70i and enhanced angiogenesis in the myocardium after laser irradiation.

ischemia; myocardial infarction; angiogenesis; heat shock proteins; laser


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