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- W2067272661 abstract "The simultaneous exposure of WI-38 human fibroblasts (HF) to a heat shock (45°C, 30 min) and an alkaline shift (≥ pH 8.0) in the incubation medium increased and extended the expression of heat shock proteins (hsps). Hsp70 was the most prominent inducible hsp synthesized during the recovery phase after the double shock, and the increase in synthesis depended on the degree of alkalinization during the heat shock. The accumulation of inducible hsp70, which was shown by Western blotting to occur in the late part of the recovery period, was more pronounced in the cells exposed to alkaline medium during the heat shock. Northern blotting did not reveal any increase in hsp70 mRNA, although time course studies following the double shock indicated a more prolonged presence of mRNA. Hsp70 gene activation was evaluated by a gel retardation assay using a 32P-labelled DNA oligonucleotide containing the heat shock consensus element (HSE) and a heat shock-induced specific binding protein (heat shock transcription factor, HSTF) from the cell extract. Heat shock activated HSTF-DNA binding and induced hsp70 mRNA expression as well as the synthesis and accumulation of hsp70. Alkaline shift, which by itself did not induce hsps expression, activated HSTF DNA-binding. However, in combination with heat shock, alkaline shift enhanced and prolonged HSTF-HSE complex association and hsp expression at both mRNA and protein levels. Since the alkaline shift-induced activation of hsp gene does not allow full transcription, these results provide further support for the multistep nature of the heat shock transcriptional response. © 1995 Wiley-Liss, Inc." @default.
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- W2067272661 date "1995-03-01" @default.
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- W2067272661 title "Effect of an alkaline shift on induction of the heat shock response in human fibroblasts" @default.
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- W2067272661 doi "https://doi.org/10.1002/jcp.1041620304" @default.
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