Celastrol Attenuates Cadmium-Induced Neuronal Apoptosis via Inhibiting Ca(2+) -CaMKII-Dependent Akt/mTOR Pathway.
Celastrol Attenuates Cadmium-Induced Neuronal Apoptosis via Inhibiting Ca(2+) -CaMKII-Dependent Akt/mTOR Pathway.
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DOI:
10.1002/jcp.25703
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发表时间:
2017-08
影响因子:
5.6
通讯作者:
中科院分区:
文献类型:
--
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Cadmium (Cd), an environmental and industrial pollutant, affects the nervous system and consequential neurodegenerative disorders. Recently, we have shown that celastrol prevents Cd-induced neuronal cell death partially by suppressing Akt/mTOR pathway. However, the underlying mechanism remains to be elucidated. Here, we show that celastrol attenuated Cd-elevated intracellular-free calcium ([Ca2+]i) level and apoptosis in neuronal cells. Celastrol prevented Cd-induced neuronal apoptosis by inhibiting Akt-mediated mTOR pathway, as inhibition of Akt with Akt inhibitor X or ectopic expression of dominant negative Akt reinforced celastrol’s prevention of Cd-induced phosphorylation of S6K1/4E-BP1 and cell apoptosis. Furthermore, chelating intracellular Ca2+ with BAPTA/AM or preventing [Ca2+]i elevation using EGTA potentiated celastrol’s repression of Cd-induced [Ca2+]i elevation and consequential activation of Akt/mTOR pathway and cell apoptosis. Moreover, celastrol blocked Cd-elicited phosphorylation of CaMKII, and pretreatment with BAPTA/AM or EGTA enhanced celastrol’s suppression of Cd-increased phosphorylation of CaMKII in neuronal cells, implying that celastrol hinders [Ca2+]i-mediated CaMKII phosphorylation. Inhibiting CaMKII with KN93 or silencing CaMKII attenuated Cd activation of Akt/mTOR pathway and cell apoptosis, and this was strengthened by celastrol. Taken together, these data demonstrate that celastrol attenuates Cd-induced neuronal apoptosis via inhibiting Ca2+-CaMKII-dependent Akt/mTOR pathway. Our findings underscore that celastrol may act as a neuroprotective agent for the prevention of Cd-induced neurodegenerative disorders.
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影响因子:
7.4
作者:
Circu, Magdalena L.;Aw, Tak Yee
通讯作者:
Aw, Tak Yee
DOI:
10.1111/j.1749-6632.1993.tb18286.x
发表时间:
1993-05-28
影响因子:
5.2
作者:
GIBBONS, SJ;BRORSON, JR;MILLER, RJ
通讯作者:
MILLER, RJ
影响因子:
4.7
作者:
Chen S;Gu C;Xu C;Zhang J;Xu Y;Ren Q;Guo M;Huang S;Chen L
通讯作者:
Chen L
影响因子:
3.8
作者:
Kim, J;Sharma, RP
通讯作者:
Sharma, RP
影响因子:
4.3
作者:
Gunter, Thomas E.;Sheu, Shey-Shing
通讯作者:
Sheu, Shey-Shing