Phenotypic characterization of mouse embryonic fibroblasts lacking heat shock factor 2.
In murine cells, the heat shock response is regulated by a transcription factor, HSF1, which triggers the transcription of heat shock genes. HSF2 has been shown to be involved in meiosis and mouse brain development. We characterized the effects of the absence of HSF2 in mouse embryonic fibroblasts (MEFs). The temperature threshold of the heat shock response appeared lowered in Hsf2(-/-) MEFS as monitored by the synthesis of heat shock protein HSP70. In contrast to unstressed wild type MEFS, HSP70 and HSF1 are localized in the nucleus of unstressed Hsf2(-/-) MEFS, a characteristic of stressed cells. HSF1 is not activated for DNA-binding at unstressed temperature in Hsf2(-/-) MEFS. Therefore, the absence of HSF2 induces some but not all of the characteristics of the stress response. In addition, Hsf2(-/-) MEFS exhibited proliferation defects, altered morphology, remodeling of the fibronectin network.
Paslaru
Liliana
L
Department of Biochemistry, "Carol Davila" University of Medicine and Pharmacy, Fundeni Hospital, Bucharest, Romania.
Morange
M
M
Mezger
Valérie
V
D000199:Actins / Q000378:metabolism; D000818:Animals; D002455:Cell Division; D002478:Cells, Cultured; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D005353:Fibronectins / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000172:deficiency* / Q000235:genetics; D006358:Hot Temperature; D051379:Mice; D018345:Mice, Knockout; D018832:Molecular Chaperones; D009363:Neoplasm Proteins / Q000378:metabolism; D010641:Phenotype; D014157:Transcription Factors / Q000172:deficiency / Q000235:genetics
D000199:Actins; D005353:Fibronectins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C486113:Hsbp1 protein, mouse; D018832:Molecular Chaperones; D009363:Neoplasm Proteins; D014157:Transcription Factors