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Activity of gluconeogenetic enzymes in swine myocardium and skeletal muscles

, : Activity of gluconeogenetic enzymes in swine myocardium and skeletal muscles. Biomedica Biochimica Acta 43(10): 1091-1100

The activity of the gluconeogenic enzyme phosphoenolpyruvate carboxykinase (PEPCK) was determined radiometrically in heart and skeletal muscle (M. semitendinosus) of 21 fetuses of the last third of gestation (80th-112th day), 17 piglets from birth until the 9th day of life and 7 fattening pigs. Simultaneously the activity of the enzymes glucose-6-phosphatase (G6Pase) and fructosebisphosphatase (FDPase) was measured colorimetrically in heart and skeletal muscle of piglets and in skeletal muscles of fattening pigs. Heart and skeletal muscle have only a low PEPCK activity. During the last third of gestation PEPCK in heart remains on a constant level, which can be demonstrated also in fattening pigs, but doubled immediately after birth. During the last two weeks of gestation, at birth and during the first days of life the PEPCK activity in the skeletal muscle is 3-fold higher than at the 80th day of gestation and in fattening pigs. G6Pase and FDPase activity of the heart remains at a constant level during the first days of life. It was impossible to detect G6Pase in the skeletal muscle of piglets. The specific FDPase activity of the skeletal muscle remains constant also postnatally. In fattening pigs skeletal muscles with different types of fibres have the same FDPase and PEPCK activity.


PMID: 6098270

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