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Akt Depletion Is an Important Determinant of L929 Cell Death following Heat Stress
Author(s) -
Galadari Sehamuddin,
Thayyullathil Faisal,
Hago Abdulkader,
Patel Mahendra,
Chathoth Shahanas
Publication year - 2008
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1414.040
Subject(s) - heat stress , protein kinase b , microbiology and biotechnology , stress (linguistics) , chemistry , biology , signal transduction , zoology , linguistics , philosophy
Exposure of mammalian cells to heat stress causes impairment of numerous physiological functions and activates a number of signaling pathways. Some of these pathways, such as induction of heat‐shock proteins and activation of Akt, enhance the ability of cells to survive heat stress. On the other hand, heat stress can trigger cell‐death signaling via activation of the stress‐activated protein kinase/c‐Jun NH2‐terminal kinase (SAPK/Jnk). Recently, it has been shown that kinases activated by heat stress can regulate synthesis and functioning of the molecular chaperones, and these chaperones modulate the activity of the cell death and survival pathways. We have found that Akt plays a central role in determining the fate of L929 fibroblast cells exposed to heat stress. In our experiments heat stress causes Akt depletion and L929 cells to undergo cell death. Heat‐shock protein 70 (Hsp70) is known to prevent stress‐induced cell death by interfering with the SAPK/Jnk signaling pathway. In our study, there is a very high level of induction of Hsp70, yet this is not sufficient to rescue Akt depletion and L929 from cell death. The Akt depletion is specific, since actin protein level does not change during the heat stress. Moreover, our studies show that L929 cells can recover from a short‐term heat shock, whereby, Akt level is returned to normal following recovery from heat shock. Therefore, it appears that the fate of the prolonged heat‐stressed fibroblast cells is determined by Akt level, and that return of Akt protein level to normal prevents cell death.