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- W2056361490 abstract "In order to study the effect of synaptic contact on the amounts of choline acetyltransferase (ChAT) and acetylcholine (ACh) in the nerve terminals and on their ability to release ACh, a freeze—thaw procedure was developed as a means to induce long lasting degeneration of rat soleus muscle. It was found that 4 days after the freeze—thaw procedure the preparation did not contract upon direct electric stimulation and the level of creatine kinase (CK) was below detection. The preparation contained about 15% of the ChAT activity and 15% of the ACh content of the controls. The ACh release evoked by 50 mM KCl was 25% of controls, but it was, when expressed as a fraction of the ACh content, about twice as high as that in control muscles. At day 12, the preparation still did not contract and the level of CK was less than 5% of controls. The ChAT activity and the ACh content were 40%) and 20% of controls, respectively. However, no release of ACh could be evoked by 50 mM KCl. At days 28 and 58 the preparation contracted upon stimulation of the nerve; the CK activity had recovered to about 20% and the ACh content to 40%, while the ChAT activity did not increase above 40%. The KCl–evoked ACh release had recovered to 20—30% of controls. The results indicate that freezing destroyed muscle cells and most intramuscular nerve branches. Subsequent regeneration of muscle fibres was slow, probably because freezing had killed many satellite cells in the muscle. Because the ChAT activity at day 12 had recovered when CK was almost absent and the preparation failed to contract, we conclude that there was expression of ChAT activity in ‘nerve terminals’ which do not make contact with regenerated muscle cells, although little if any ACh was released from these sites. ©1998 Elsevier Science Ltd. All rights reserved." @default.
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- W2056361490 date "1998-05-01" @default.
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- W2056361490 title "Recovery of acetylcholine release and choline acetyltransferase activity after freezing-induced degeneration of rat soleus muscle" @default.
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- W2056361490 doi "https://doi.org/10.1016/s0197-0186(97)00120-4" @default.
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