Effects of moderate (42 degrees C, 1 hour) and strong (44 degrees C, 1 hour) heat shocks on resting (TR) and phytohemagglutinin stimulated human T-cells (TP) were studied. Both treatments were shown to cause in the latter considerable fall of the level of protein synthesis, as compared to resting cells. Mitogen-stimulated cells stopped their proliferation irreversibly and part of them (approx: 40%) died after even mild shock (at 42 degrees C). Following heat treatment in both the cell types the synthesis of heat shock 70 and 90 kDa proteins was induced which was much more pronounced in TR. These and earlier results of the authors allow a conclusion that involvement of cells in active proliferation may decrease their resistance to stress, and that this phenomenon coincides with the diminishing in synthesis and accumulation of stress proteins.
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