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- W1994511076 abstract "Previous studies have demonstrated that transforming growth factor-beta (TGF-beta) can accelerate wound healing, inhibit free radical formation and limit myocardial ischemia/reperfusion injury in a variety of experimental models. However, it is unknown whether exogenous TGF-beta 1 can attenuate the prolonged contractile dysfunction that is observed after a brief, reversible ischemic insult (myocardial stunning). Thus, open-chest dogs undergoing a 15-min left anterior descending coronary artery occlusion and 4 h of reperfusion were given TGF-beta 1 as an intravenous bolus (250 micrograms) at 24 h and again at 1 h before coronary occlusion (n = 5). Control dogs (n = 7) received equivalent amounts of vehicle. The two groups were similar with respect to occluded bed size, collateral blood flow and rate-pressure product. Fundamental physiological parameters, such as body temperature, arterial pH, PO2 and hematocrit, were within normal limits throughout the experiment. In control dogs, regional myocardial function (assessed as systolic thickening fraction) remained depressed throughout the 4 h reperfusion period, indicating severe myocardial stunning. TGF-beta 1 did not produce any significant improvement in the recovery of regional function; 4 h after reperfusion, paradoxical systolic thinning was still present in both treated and control groups, with thickening fraction being -22.5 +/- 6.1% and -31.0 +/- 5.3% of baseline, respectively (P = N.S.). These results demonstrate that a large dose of TGF-beta 1 given before ischemia fails to attenuate myocardial stunning in the open-chest dog, suggesting that this growth factor does not exert protective effects in the setting of reversible myocardial ischemia/reperfusion injury." @default.
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- W1994511076 date "1993-04-01" @default.
- W1994511076 modified "2023-09-28" @default.
- W1994511076 title "Effect of Transforming Growth Factor-Beta 1 on Myocardial Stunning in the Intact Dog" @default.
- W1994511076 doi "https://doi.org/10.1006/jmcc.1993.1044" @default.
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