PMID: 9005654Mar 1, 1996Paper

Ca2+ ion transport in the sarcoplasmic reticulum of the gastrocnemius muscles of white rats under treatment of the sciatic nerve with a colchicine solution

Ukrainskiĭ biokhimicheskiĭ zhurnal
A Z BrazalukV P Tkachenko

Abstract

In different time after application of 12.5 microM colchicine-inhibitor of exoplasmic current to the ischiadicus the quantity of amino acid residues of methionine and cysteine in the sarcoplasmic reticulum decreases, its protein content changes. The Ca(2+)-ATPase activity increases on the 3d day after colchicine application and decreases on the 14th day. Analogical changes are observed in the capacity of the sarcoplasmic reticulum to transport calcium ions, the Michaelis constant in this case being stable. Passive outflow of Ca2+ from the sarcoplasmic reticulum vesicules changes in such a way: the Michaelis constant decreases with a simultaneous increase in the maximal velocity after 14 and 28 days of colchicine application.

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