Induction of heat shock protein transcripts and B2 transcripts by various stresses in Chinese hamster cells

• Published in: Experimental cell research Vol. 182; no. 1; pp. 61 - 74
• Main Authors: Fornace, Albert J., Alamo, Isaac, Hollander, M.Christine, Lamoreaux, Etienne
• Format: Journal Article
• Language: English
• Published: Orlando, FL Elsevier Inc 01.05.1989; Elsevier
• Subjects: Animals; Biological and medical sciences; Blotting, Northern; Cell Cycle; Cell Line; Cell Nucleus - physiology; Cloning, Molecular; Cricetinae; DNA - genetics; DNA Damage; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation; Heat-Shock Proteins - genetics; Molecular and cellular biology; Molecular genetics; Repetitive Sequences, Nucleic Acid; Stress, Physiological - physiopathology; Time Factors; Transcription, Genetic; Transcription. Transcription factor. Splicing. Rna processing; Ubiquitins - genetics; Molecular hybridization; RNA; Transcription; Induction; Cell nucleus; Rodentia; Cytotoxicity; CHO cell line; Dose activity relation; Vertebrata; Mammalia; Complementary DNA; Heat shock protein; Hamster
• ISSN: 0014-4827; 1090-2422
• DOI: 10.1016/0014-4827(89)90279-6

We have investigated the induction of known hsp (heat shock protein) RNA and other heat shock (HS) inducible transcripts in Chinese hamster cells by various stresses including DNA damaging agents. cDNA clones coding for at least 14 different HS-inducible transcripts were isolated. By DNA sequence analysis and homology with cDNA clones of other species, some of these cDNA clones were identified as coding for hsp27, hsp89α, hsp89β, two different hsp70s, ubiquitin, and the HS-inducible RNA polymerase III transcript B2. In addition, hsp-related cDNA clones, hsp60 and four with hsp70 homology, were isolated which coded for transcripts which were not induced by HS or other stresses in two different Chinese hamster cell lines. After HS or treatment with the HS-mimetic agent ethanol, there was coordinate induction of all 14 transcripts. With severe HS treatments which produced substantial cytotoxicity, the increase in all transcripts except B2 RNA was delayed and, in some cases, suppressed. The only DNA damaging agent, which induced many HS-inducible transcripts, was high-dose methylmethane sulfonate (MMS). However, induction by MMS was not coordinate for all transcripts as it was for HS, and B2 RNA was not induced. hsp27 RNA induction differed from the others in several respects including induction by irradiation and other agents which produce high levels of DNA damage repaired by nucleotide excision repair. The implications of these findings in cellular events such as cytotoxicity, thermotolerance, and regulation of stress responses will be discussed.