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[Isoform pattern of inducible HSP 70 in the rat myocardium after heat shock].

The hsp 70 content was measured in the myocardium of a control rat group, in the group of rats 24 hours following a heat shock and in the group of rats 48 hours after a heat shock. In 24 hours after the heat shock, a major inducible hsp 70 with molecular weight of 71 kDa and pI about 5.8 occurred which was utterly absent in myocardial cytosol from control animals. In addition, there was an increase in polypeptide fraction with molecular weight of 73 kDa and pI about 5.6 (HSX73). In 48 hours after the heat shock, first the inducible hsp 70 with molecular weight of 71 kDa and pI about 5.8 disappeared which was found in 24 hours; secondly, HSX73 decreased to the control level and, thirdly, several isoforms pronouncedly accumulated with molecular weight of about 71 kDa and pI ranging from 5.9 to 6.3. Thus, the isoform composition of stress proteins induced by heat shock strongly depends on the time after the stress exposure. Furthermore, the accumulation of more acidic isoforms precedes the accumulation of alkaline ones.