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Neonatal rat primary myocardial cells were subjected to heat stressin vitro,as a model for investigating the distribution and expression of Hsp27 and αB-crystallin. After exposure to heat stress at 42 ℃ for different durations,the activities of enzymes expressed during cell damage increased in the supernatant of the heat-stressed myocardial cells from 10 min,and the pathological lsions were characterized by karyopyknosis and acute degeneration. Thus,cell damage was induced at the onset of heat stress. Immunofluorescence analysis showed stronger positive signals for both Hsp27 and αB-crystallin from 10 min to 240 min of exposure compared to the control cells. According to the Western blotting results,during the 480 min of heat stress,no significant variation was found in Hsp27 and αB-crystallin expression;however,significant differences were found in the induction of their corresponding mRNAs. The expression of these small heat shock proteins (sHsps) was probably delayed or overtaxed due to the rapid consumption of sHsps in myocardial cells at the onset of heat stress. Our findings indicate that Hsp27 and αB-crystallin do play a role in the response of cardiac cells to heat stress,but the details of their function remain to be investigated.