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Partial ischemia reduces the efficiency of sarcoplasmic reticulum Ca2+ transport in rat EDL

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Abstract

To investigate the hypothesis that prolonged partial ischemia would result in a depression in homogenate sarcoplasmic reticulum (SR) Ca2+-sequestering and mechanical properties in muscle, a cuff was placed around the hindlimb of 8 adult Sprague–Dawley rats (267 ± 5.8 g; × ± S.E.) and partially inflated (315 mm Hg) for 2 h. Following occlusion, the EDL was sampled both from the ischemic (I) and contralateral control (C) leg and SR properties compared with the EDL muscles extracted from rats (n = 8) immediately following anaesthetization (CC). Ischemia was indicated by a lower (p < 0.05) concentration (mmol.kg dry wt–1) of ATP (19.0 ± 0.7 vs. 16.7 ± 0.7) and phosphocreatine (58.1 ± 5.7 vs. 35.0 ± 4.6) in I compared to C. Although Ca2+-ATPase activity (μmol·g protein–1.sec–1 ), both maximal and submaximal, was not different between C and I (19.7 ± 0.4 vs. 18.5 ± 1.3), reductions (p < 0.05) in Ca2+-uptake (mmol·g protein–1.sec–1 ) of between 18.2 and 24.7% across a range of submaximal free Ca2+-levels were observed in I compared to C. Lower submaximal Ca2+-ATPase activity and Ca2+-uptake were also observed in the EDL in C compared to CC animals. Time dependent reductions (p < 0.05) were found in peak twitch and maximal tetanic tension in EDL from I but not C. It is concluded that partial ischemia, resulting in modest reductions in energy state in EDL, induces a reduction in Ca2+-uptake independent of changes in Ca2+-ATPase activity. These changes reduce the coupling ratio and the efficiency of Ca2+-transport by SR.

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Authors and Affiliations

  1. Department of Kinesiology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

    R. Tupling, H. Green & S. Tupling

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  1. R. Tupling
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  2. H. Green
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Correspondence to H. Green.

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Tupling, R., Green, H. & Tupling, S. Partial ischemia reduces the efficiency of sarcoplasmic reticulum Ca2+ transport in rat EDL. Mol Cell Biochem 224, 91–102 (2001). https://doi.org/10.1023/A:1011930502758

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