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Effect of thermal stress on early and late passaged mouse lens epithelial cells
Author(s) -
Bagchi M.,
Besser D.,
Reddy T.R.,
Skoff R.,
Maisel H.
Publication year - 2007
Publication title -
journal of cellular biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 165
eISSN - 1097-4644
pISSN - 0730-2312
DOI - 10.1002/jcb.21339
Subject(s) - heat shock protein , heat shock factor , biology , microbiology and biotechnology , protein biosynthesis , heat shock , downregulation and upregulation , cell culture , hsp70 , biochemistry , gene , genetics
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 αTN‐4 cells. Data collected in this study revealed that the nucleotide sequence of HSF‐1 mRNA obtained from early and late passaged αTN‐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 αβ crystallin showed significantly increased synthesis 18 h post heat stress. The late passaged αTN‐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 αTN‐4 cell. J. Cell. Biochem. 102: 1036–1042, 2007. © 2007 Wiley‐Liss, Inc.