Effect of starvation and insulin in vivo on the activity of the pyruvate dehydrogenase complex in rat skeletal muscles |
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Authors: | Gareth S. Denyer David Lam Gregory J. Cooney Ian D. Caterson |
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Affiliation: | Department of Endocrinology, Royal Prince Alfred Hospital, Sydney, Australia. |
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Abstract: | The in vivo responses of pyruvate dehydrogenase (PDH) complex to starvation and insulin was assessed in heart, diaphragm and red quadriceps muscle. PDH complex activity was decreased by starvation (3.4–10.2-fold), the magnitude of change depending on muscle type. Insulin increased PDH activity in all muscle types. In fed rats, this effect was relatively small (1.25–1.29-fold). In starved rats there were effects in heart (4.3-fold) and red quadriceps (1.7-fold) but no effect in diaphragm. These results demonstrate that PDH complex in different groups of muscle has different insulin sensitivity (particularly in tissues from starved animals). |
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Keywords: | Pyruvate dehydrogenase complex Skeletal muscle Starvation Insulin |
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