title: Effect of thermal stress on early and late passaged mouse lens epithelial cells.
abstract: Cataract is an age related disease of protein aggregation. It has been suggested that aging affects the cells ability to protect protein integrity. The protein integrity, which is essential for cellular homeostasis, is maintained by a complex system of refolding or degradation of damaged proteins. The heat shock proteins (hsps) are the major contributors in the maintenance of protein integrity. The heat shock transcription factor (HSF-1) is the master regulator of all hsp synthesis in response to stress. This investigation examined the role of HSF-1 in the regulation of hsp synthesis in early and late passaged alphaTN-4 cells. Data collected in this study revealed that the nucleotide sequence of HSF-1 mRNA obtained from early and late passaged alphaTN-4 cells were identical. When early and late passaged cell were exposed to thermal stress, their hsp expression were also similar. HSP-40 expression was detected after 2 h of heat stress, whereas HSP-70 and low molecular weight heat shock protein alphabeta crystallin showed significantly increased synthesis 18 h post heat stress. The late passaged alphaTN-4 cells ability to upregulate hsps in response to heat stress could be due to its high replicative activities. The data presented here suggests a relationship between the presence of functional HSF-1 and sustained proliferative activities of the late passaged alphaTN-4 cell.
authors.affiliation: Department of Anatomy and Cell Biology, School of Medicine, Wayne State University, Detroit, Michigan 48201, USA. mbagchi@med.wayne.edu
authors.forename: M
authors.initials: M
authors.lastname: Bagchi
authors.forename: D
authors.initials: D
authors.lastname: Besser
authors.forename: T R
authors.initials: TR
authors.lastname: Reddy
authors.forename: R
authors.initials: R
authors.lastname: Skoff
authors.forename: H
authors.initials: H
authors.lastname: Maisel
mesh_terms: D000818:Animals; D001483:Base Sequence; D049109:Cell Proliferation; D002478:Cells, Cultured; D004268:DNA-Binding Proteins / Q000502:physiology*; D004847:Epithelial Cells / Q000166:cytology* / Q000378:metabolism; D050956:HSP40 Heat-Shock Proteins / Q000096:biosynthesis; D018840:HSP70 Heat-Shock Proteins / Q000096:biosynthesis; D000076249:Heat Shock Transcription Factors; D006360:Heat-Shock Proteins / Q000096:biosynthesis*; D006358:Hot Temperature; D007908:Lens, Crystalline / Q000166:cytology* / Q000378:metabolism; D051379:Mice; D012333:RNA, Messenger; D013312:Stress, Physiological; D013997:Time Factors; D014157:Transcription Factors / Q000502:physiology*; D015854:Up-Regulation
chemical_list: D004268:DNA-Binding Proteins; D050956:HSP40 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D000076249:Heat Shock Transcription Factors; D006360:Heat-Shock Proteins; C490017:Hsf1 protein, mouse; D012333:RNA, Messenger; D014157:Transcription Factors