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Effect of denervation on the phospholipid content in subcellular fractions of tonic and tetanic muscles.

Four weeks after denervation, various changes were observed in the phospholipid composition of the sarcolemmal and sarcoplasmic fractions of skeletal muscles with different functions. Neurotomy also affected the innervated contralateral muscles and produced opposite changes in the phospholipid content of subcellular fractions. The increase in the amount of phospholipids in the sarcolemmal fractions of the denervated muscles was only apparent. The difference between the denervated and contralateral muscles was also due to the decrease of phospholipids in the contralateral muscles. These changes were more pronounced in the tetanic (fast-twitch) than in the tonic (slow-twitch) muscles. In the sarcoplasmic fraction of the denervated tetanic muscle an increase, while in that of the tonic one a slight decrease of phospholipids appeared. In contrast, the phospholipid content in the sarcoplasmic fractions of contralateral muscles did not decrease, while it increased slightly in the tonic muscle. The amount of plasmalogens (fatty aldehyde: lipid phosphorus ratio) decreased only in the subcellular fractions of the denervated muscles while there was no change in those of the contralateral muscles.