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- W2045639911 abstract "Calcium kinetics and its intracellular mobilization are important in all biological processes. We used verapamil to examine the effect of calcium entry blockade on microvascular transport of macromolecules in ischemia-reperfusion injury. The rat cremaster muscle was splayed, placed in a Lucite intravital chamber, and suffused with bicarbonate buffer. The clearance of fluorescein isothiocyanate-conjugated dextran (FITC-dextran 150) was measured as an index of microvascular transport. After determination of baseline data (clearance of FITC-dextran 150, 3.0 +/- 0.5 microliters/5 min/g), the muscle was made ischemic for 2 hours by clamping its vascular pedicle and subsequently was reperfused for 2 hours. Ischemia-reperfusion produced a marked increase in FITC-dextran clearance. After a peak of 12 +/- 2-fold increase observed in the first 15 minutes into reperfusion, FITC-dextran 150 clearance decreased in magnitude and stabilized at about sixfold above baseline. Verapamil did not change the baseline clearance values. Importantly, verapamil inhibited the ischemia-induced increase in clearance and maintained the values at or near the baseline levels. We simultaneously determined the rate of release of 6-ketoprostaglandin F1 alpha (6-keto-PGF1 alpha) and thromboxane B2 (TXB2) into the suffusate. Verapamil decreased the baseline values of 6-keto-PGF1 alpha and increased those of TXB2. Verapamil inhibited the ischemia-reperfusion-induced increase in 6-keto-PGF1 alpha but did not alter the effect of ischemia-reperfusion on TXB2. Our main results demonstrate the effectiveness of verapamil in preventing microvascular alterations leading to increased leakage of macromolecules." @default.
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- W2045639911 date "1990-06-01" @default.
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- W2045639911 title "Calcium entry blockade prevents leakage of macromolecules induced by ischemia-reperfusion in skeletal muscle." @default.
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- W2045639911 doi "https://doi.org/10.1161/01.res.66.6.1636" @default.
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