Modulation of thermal induction of hsp70 expression by Ku autoantigen or its individual subunits Journal Article
| Authors: | Yang, S. H.; Nussenzweig, A.; Li, L.; Kim, D.; Ouyang, H.; Burgman, P.; Li, G. C. |
| Article Title: | Modulation of thermal induction of hsp70 expression by Ku autoantigen or its individual subunits |
| Abstract: | Previously, we proposed a dual control mechanism for the regulation of the heat shock response in mammalian cells: a positive control mediated by the heat shock transcription factor HSF1 and a negative control mediated by the constitutive heat shock element-binding factor (CHBF). To study the physiological role of CHBF in the regulation of heat shock response, we purified CHBF to apparent homogeneity and showed it to be identical to the Ku autoantigen, a heterodimer consisting of 70-kDa (Ku-70) and 86-kDa (Ku-80) polypeptides. To study further the functional significance of Ku/CHBF in the cellular response to heat shock, we established rodent cell lines that stably and constitutively overexpressed one or both subunits of the human Ku protein, and examined the thermal induction of hsp70 and other heat shock proteins in these Ku-overexpressing cells. We show that expression of the human Ku-70 and Ku-80 subunits jointly or of the Ku-70 subunit alone specifically inhibits beat-induced hsp70 expression. Conversely, expression of human Ku-80 alone does not have this effect. Thermal induction of other heat shack proteins in all of the Ku-overexpressing cell lines appears not to be significantly affected, nor is the state of phosphorylation or the DNA- binding ability of HSF1 affected. These findings support a model in which hsp70 expression is controlled by a second regulatory factor in addition to the positive activation of HSF1. The Ku protein, specifically the Ku-70 subunit, is involved in the regulation of hsp70 gene expression. |
| Keywords: | controlled study; protein phosphorylation; nonhuman; animal cell; cell survival; protein dna binding; transcription factor; gene transfer; gene expression regulation; rat; protein induction; autoantigen; heat shock protein 70; protein subunit; retrovirus; heat shock; priority journal; article |
| Journal Title: | Molecular and Cellular Biology |
| Volume: | 16 |
| Issue: | 7 |
| ISSN: | 0270-7306 |
| Publisher: | American Society for Microbiology |
| Date Published: | 1996-07-01 |
| Start Page: | 3799 |
| End Page: | 3806 |
| Language: | English |
| PUBMED: | 8668197 |
| PROVIDER: | scopus |
| PMCID: | PMC231376 |
| DOI: | 10.1128/MCB.16.7.3799 |
| DOI/URL: | |
| Notes: | Article -- Export Date: 22 November 2017 -- Source: Scopus |
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