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Mild heat induces a distinct “eustress” response in Chinese Hamster Ovary cells but does not induce heat shock protein synthesis
Author(s) -
Begüm Peksel,
Imre Gombos,
Mária Péter,
László Vı́gh,
Ádám Tiszlavicz,
Mario Brameshuber,
Gábor Balogh,
Gerhard J. Schütz,
Ibolya Horváth,
Zsolt Török
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-017-15821-8
Subject(s) - proteostasis , heat shock protein , microbiology and biotechnology , chinese hamster ovary cell , heat shock , hsp70 , biology , homeostasis , lipidomics , cellular stress response , chaperone (clinical) , cell culture , fight or flight response , biochemistry , medicine , gene , pathology , genetics
The current research on cellular heat stress management focuses on the roles of heat shock proteins (HSPs) and the proteostasis network under severe stress conditions. The mild, fever-type stress and the maintenance of membrane homeostasis are less well understood. Herein, we characterized the acute effect of mild, fever-range heat shock on membrane organization, and HSP synthesis and localization in two mammalian cell lines, to delineate the role of membranes in the sensing and adaptation to heat. A multidisciplinary approach combining ultrasensitive fluorescence microscopy and lipidomics revealed the molecular details of novel cellular “eustress”, when cells adapt to mild heat by maintaining membrane homeostasis, activating lipid remodeling, and redistributing chaperone proteins. Notably, this leads to acquired thermotolerance in the complete absence of the induction of HSPs. At higher temperatures, additional defense mechanisms are activated, including elevated expression of molecular chaperones, contributing to an extended stress memory and acquired thermotolerance.

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