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- W1900538397 abstract "Previous studies performed in cell lines have shown that the heat shock protein, DNAJB6, protects against the proteotoxic effects of mutant huntingtin (mut-Htt) via direct interaction with mut-Htt. However, these studies were performed primarily using in vitro models and cell lines. We report that when expressed in primary neurons, DNAJB6 induces cell death. Neurotoxicity is observed with both the DNAJB6a isoform, which is strictly nuclear, and the DNAJB6b isoform, which is predominantly cytoplasmic, suggesting that neurotoxicity is mediated in the nucleus. However, when co-expressed in primary neurons with mut-Htt, DNAJB6 protects against mut-Htt neurotoxicity. This suggests that the contrasting effect of DNAJB6 on neuronal viability depends on the presence or absence of proteotoxic stress. Neurotoxicity of DNAJB6 cannot be prevented by inhibition of glycogen synthase kinase 3 beta (GSK3β) or c-Jun N-terminal kinase (JNK) but is prevented by pharmacological inhibition of cyclin-dependent kinases (CDKs). Expression of dominant-negative forms of CDK2 or CDK4, or of p21(CIP1), the physiological inhibitor of CDKs, also inhibits DNAJB6 neurotoxicity. DNAJB6 neurotoxicity can also be inhibited by histone deacetylase-4 (HDAC4), which interacts with DNAJB6 and which has previously been described to inhibit cell cycle progression. These results conclude that neurotoxicity resulting from elevated DNAJB6 is cell cycle dependent." @default.
- W1900538397 created "2016-06-24" @default.
- W1900538397 creator A5028628379 @default.
- W1900538397 creator A5034976147 @default.
- W1900538397 date "2015-10-17" @default.
- W1900538397 modified "2023-10-06" @default.
- W1900538397 title "Cell and Context-Dependent Effects of the Heat Shock Protein DNAJB6 on Neuronal Survival" @default.
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- W1900538397 doi "https://doi.org/10.1007/s12035-015-9452-3" @default.
- W1900538397 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5364949" @default.
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