[Oxidative stress-induced accumulation of heat shock protein 70 within nucleolus].
OBJECTIVE
To investigate the effect of oxidative stress on the accumulation of heat shock protein 70 (HSP70) within C2C12 myogenic cells.


METHODS
Heat shock response (42 degrees C for 1 h and recovery for 12 h at 37 degrees C) was used to induce the expression of heat shock protein 70. We constructed a recombinant plasmid of HSP70 with enhanced green fluorescent protein (EGFP). After being transfected transiently into C2C12 cells, immunoblotting was used to detect the expression of HSP70 induced by heat shock response and transfection. Immunocytochemistry, fluorescent microscopy and immunoblotting were used to detect the translocation of HSP70.


RESULTS
Immunoblotting showed that the overexpression of HSP70 was induced by heat shock response and transient transfenction. HSP70 localized within the cytoplasm of the normal cells, but HSP70 translocated from the cytoplasm to the nucleus and the nucleolus at 1 h after the treatment of oxidative stress (0.5 mmol/L H2O2) by using immunocytochemistry, fluorescent microscopy and immunoblotting for cellular partial proteins.


CONCLUSIONS
Oxidative stress may induce the accumulation of heat shock protein 70 within the nucleolus.
Tu
Zi-zhi
ZZ
Department of Pathophysiology, Xiangya School of Medicine, Central South University, Changsha 410078, China.
Wang
Kang-kai
KK
Zou
Jiang
J
Liu
Ke
K
Deng
Gong-hua
GH
Xiao
Xian-zhong
XZ
D002466:Cell Nucleolus / Q000378:metabolism*; D002478:Cells, Cultured; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D032446:Myoblasts / Q000166:cytology / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000166:cytology / Q000378:metabolism*; D018384:Oxidative Stress / Q000502:physiology*
D018840:HSP70 Heat-Shock Proteins