Abstract
The kinetics of in vivo regulation of mitochondrial respiration by ADP was studied in rat heart, slow-twitch skeletal muscle (soleus) and fast-twitch skeletal muscle (gastrocnemius, plantaris, quadriceps and tibialis anterior) by means of saponin-skinned fibres. Mitochondrial respiratory parameters were determined in the absence and presence of creatine (20 mM), and the effect of proteolytic enzymes (trypsin, chymotrypsin or elastase) on these parameters was investigated in detail. The results of these experiments confirm the observation of Veksler et al. [Veksler, V.I., Kuznetsov, A. V., Anflous, K., Mateo, P., van Deursen, J., Wieringa, B. & Ventura-Clapier, R. (1995) J. Biol. Chem. 270, 19921-19929], who studied muscle fibres from normal and transgenic mice, that the kinetics of respiration regulation in muscle cells is tissue specific. We found that in rat cardiac and soleus muscle fibres the apparent K(m) for respiration regulation was 300-400 microM and decreased to 50-80 microM in the presence of creatine. In contrast, in skinned fibres from gastrocnemius, plantaris, tibialis anterior and quadriceps muscles, this value was initially very low, 10-20 microM, i.e. the same as that is in isolated muscle mitochondria, and the...Continue Reading
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