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. 1989 Sep;9(9):3888–3896. doi: 10.1128/mcb.9.9.3888

Unusual levels of heat shock element-binding activity in embryonal carcinoma cells.

V Mezger 1, O Bensaude 1, M Morange 1
PMCID: PMC362450  PMID: 2779570

Abstract

In contrast to differentiated somatic cells, mouse embryonal carcinoma (EC) cell lines spontaneously express high levels of major members of the heat shock protein (HSP) family. In addition, some EC cell lines (noninducible) are not able to induce HSP gene transcription and HSP synthesis after a stress. However, after in vitro differentiation, constitutive HSP expression decreases and the differentiated derivatives become able to induce HSP gene transcription after a stress. These cells were tested by gel shift assays for the presence of an activity able to bind the heat shock element (HSE) before and after a stress. Control fibroblasts grown at 37 degrees C did not contain significant levels of HSE-binding activity, but heat shock dramatically increased the level of HSE-binding activity. In contrast to control fibroblasts, all EC cells contained significant levels of HSE-binding activity at 37 degrees C. In the inducible EC cell line F9, as in fibroblasts, heat shock strongly increased the level of HSE-binding activity. In the noninducible EC cells, however, HSE-binding activity markedly decreased upon heat shock. During in vitro differentiation of the noninducible cell line PCC7-S-1009, the constitutive HSE-binding activity found at 37 degrees C disappeared and heat induction of the HSE-binding activity appeared. Therefore, a good correlation exists between the high spontaneous expression of some members of the HSP family and the constitutive level of HSE-binding activity in EC cells at 37 degrees C. Heat induction of HSP gene transcription correlates with a strong increase in HSE-binding activity, whereas a deficiency in heat induction of HSP gene transcription is associated with a loss of HSE-binding activity upon heat shock.

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Selected References

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