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Early activation of heat shock genes in H2O2-treated Drosophila cells.

Drosophila cells of a diploid clone derived from line Kc were treated with 1 mM H2O2 for 1 to 20 minutes. Dot blot and Northern blot analysis of RNAs extracted from control and treated cells showed that the transcriptional activation of the 6 heat-shock genes tested was early, and maximal within 5 minutes of H2O2 treatment. Analysis of the kinetics of induction of the heat-shock proteins (hsps) after an exposure to H2O2 of 2 or 5 minutes, followed by removal, suggests that this brief treatment was sufficient to trigger the synthesis of all the hsps, which was maximal 1.5 to 3h after this short H2O2 treatment.