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Radioautographic analysis of the renewal of proteins newly formed in striated skeletal muscle


, : Radioautographic analysis of the renewal of proteins newly formed in striated skeletal muscle. Folia Morphologica (Prague) 25(1): 83-87

Light microscopic and EM studied were made using anterior tibial muscles. Radiographic density of specimens was studied to calculate the catabolic rate of the proteins. The incorporation of 3H-leucine occurred in all parts of the muscle cell, but was greater in young animals. Concentration indices of the radioactive marker were calculated for A and I muscle fiber bands, sarcoplasm and mitochondria. After incorporation of 3H-leucine, 2 pools of newly formed proteins were identified in the striated muscle of young and adult animals. One of these was renewed in 1-2 wk, the other in about a month. The rate of newly formed proteins was greater in the red fibers in the beginning. With the passage of time, the proteins renewed themselves, both in the myofilaments and in the sarcoplasm and mitochondria. The rate of renewal was slower in the myofilaments than in other structures in adult animals.

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