Abstract
The expression patterns of two mammalian heat shock factors (HSFs) were analysed in cell systems known to reflect an altered heat shock response. For being able to discriminate between the two closely related factors HSF 1 and HSF 2, specific cDNA sequences were cloned and used to generate antisense RNAs as hybridization probes. In general, in various cell lines expression of the two heat shock factors was clearly different. These expression patterns of the HSF genes were not influenced by retinoic acid-induced differentiation of human NT2 and mouse F9 teratocarcinoma cells. Generally, HSF 2 expression was extremely low, whereas the significantly higher expression of HSF 1 revealed cell specific differences. The highest expression rates of both HSFs were observed in 293 cells. To examine whether these high levels are involved in the constitutive expression of heat shock genes in these cells, we analysed the binding pattern of 293 cell proteins to the heat shock elements (HSEs). As with other cells, HSE-binding activity in 293 cells was only observed after heat shock treatment. This points to an HSE-independent way for high level expression of heat shock genes in these cells.
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Victor, M., Benecke, BJ. Expression levels of heat shock factors are not functionally coupled to the rate of expression of heat shock genes. Mol Biol Rep 25, 135–141 (1998). https://doi.org/10.1023/A:1006801205904
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DOI: https://doi.org/10.1023/A:1006801205904