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. 1993 Mar;67(3):493–499. doi: 10.1038/bjc.1993.92

Different HSP70 expression and cell survival during adaptive responses of 3T3 and transformed 3T3 cells to osmotic stress.

P G Petronini 1, R Alfieri 1, E De Angelis 1, C Campanini 1, A F Borghetti 1, K P Wheeler 1
PMCID: PMC1968253  PMID: 8439499

Abstract

Responses both to hyperosmotic stress and to heat shock were compared in 3T3 cells, spontaneously transformed cells (ST3T3) and simian virus 40-transformed cells (SV3T3). Cell adaptation to these stresses was measured in terms of surviving cell viability and plating efficiency, while their induced synthesis of stress proteins was monitored in terms of the presence of mRNA for HSP70, the pattern of polypeptides synthesised and the accumulation of HSP70 detectable by monoclonal antibodies. All three types of cells responded similarly to heat shock in their expression of HSP70 and showed no clear differences in ability to recover. In contrast, both ST3T3 and SV3T3 cells adapted more poorly and much more slowly to hyperosmotic stress (0.5 osM incubation) than did normal 3T3 cells. This different pattern of adaptation to hyperosmotic stress was parallelled by the cells' different expression of a stress protein that could not be distinguished from the heat-induced HSP70 by any of the methods listed above. In view of these findings it seems possible that hyperosmotic treatment might be useful in selectively affecting the survival of tumour cells.

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