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- W2073588035 abstract "Cadmium-resistant cells were developed in our laboratory with rat lung epithelial cells (LECs) by stepwise exposure of LECs to cadmium chloride from 1 microM to 20 microM after 20 passages. To investigate the Cd-resistant phenotype in a long-term perspective, cadmium-resistant cells adapted to 20 microM cadmium (Cd(R)) were then cultured in the absence of cadmium for various passages [Cd(R)(-n)]. All these adapted cells were significantly protected from cadmium toxicity as compared to parental cadmium-sensitive LECs (Cd(S)). The cadmium-resistant phenotype of adapted cells was relatively stable in the absence of cadmium for as long as 40 passages. Basal mRNA level of metallothionein-1 (MT-1) was dramatically higher in Cd(R) than in Cd(R)(-), which may account for the higher Cd-resistance of Cd(R) than Cd(R)(-). MT-1 mRNA level decreased drastically in Cd(R) after cadmium removal, suggesting that the high basal level of MT-1 in Cd(R) may be only partially responsible for cadmium-resistance. Treatment of cells with high levels of cadmium resulted in decreased phosphorylation of c-Jun N-terminal kinase (JNK1/2) in adapted cells than in sensitive cells and this cadmium-induced JNK activity was blocked by JNK inhibitor II, SP600125. Ro318220, a strong activator of JNK, reverted cadmium-sensitive phenotype in adapted cells. Taken together, our results suggest that during cadmium adaptation, cells develop tolerance to cell death, generally due to perturbation of the JNK signaling pathway and the nonresponsiveness of JNK phosphorylation is critical for the Cd-tolerance in these cells." @default.
- W2073588035 created "2016-06-24" @default.
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- W2073588035 date "2006-08-15" @default.
- W2073588035 modified "2023-10-17" @default.
- W2073588035 title "Acquired tolerance in cadmium-adapted lung epithelial cells: Roles of the c-Jun N-terminal kinase signaling pathway and basal level of metallothionein" @default.
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- W2073588035 doi "https://doi.org/10.1016/j.taap.2006.01.011" @default.
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