Levels of energy-related metabolites in intact and isolated perfused-superfused rat skeletal muscles
Adenosine 5'-triphosphate (ATP), phosphocreatine (PCr), creatine (Cr), inorganic phosphate (Pi), lactate (LAC), pyruvate (PYR) and glycogen as glucose (GLU) were determined and free adenosine 5'-diphosphate (ADP) was calculated from ATP:creatine phosphokinase (CPK) reaction in the gracilis...
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Published in | Physiological research Vol. 43; no. 3; pp. 175 - 180 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Czech Republic
1994
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Subjects | |
Online Access | Get full text |
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Summary: | Adenosine 5'-triphosphate (ATP), phosphocreatine (PCr), creatine (Cr), inorganic phosphate (Pi), lactate (LAC), pyruvate (PYR) and glycogen as glucose (GLU) were determined and free adenosine 5'-diphosphate (ADP) was calculated from ATP:creatine phosphokinase (CPK) reaction in the gracilis muscle of cold-acclimated rats in vivo, and in completely isolated muscles under medium perfusion and superfusion in vitro, using the freeze-clamping method. The mean in vivo levels (mumol/g w.w.) were: ATP 4.8, PCr 12.0, Cr 7.8, Pi 16.1, LAC 1.6, PYR 0.09, GLU 22.9, ADP 0.62 x 10(-3). Isolation of the muscle (about 11 min of anoxia followed by perfusion in the air with a high pO2 medium) decreased macroergic phosphate levels (ATP 3.0, PCr 8.3). In isolated muscles perfused with a high pO2 medium (99 kPa O2, perfusion rate 70 microliters/min) and simultaneously superfused with a low pO2 medium (6.2 kPa O2, 2.3 ml/min) at 28 degrees C in vitro the levels of metabolites were (mumol/g w.w.): ATP 3.1, PCr 8.5, Cr 5.6, Pi 9.2, LAC 2.1, PYR 0.19, GLU 6.6, ADP 0.44 x 10(-3). The mean steady oxygen uptake of the isolated muscle was 97 nmol O2 x min-1 x g-1 w.w. Thus, the levels of macroergic phosphates and their derivatives are lower after isolation and perfusion of the muscle, but the creatine charge [PCr]/([PCr]+[Cr]) remains stable (0.61 in vivo versus 0.60 in the isolated muscle). This indicates that the steady-state and high energy status of the isolated perfused-superfused gracilis muscle is maintained [corrected]. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0862-8408 |