期刊
MOLECULAR AND CELLULAR BIOCHEMISTRY
卷 318, 期 1-2, 页码 109-115出版社
SPRINGER
DOI: 10.1007/s11010-008-9862-x
关键词
Parkinson's disease; Ubiquitin proteasome system; Endoplasmic reticulum stress; Unfolded protein response; UCH-L1 inhibitor
类别
资金
- National Program of Basic Research [2006CB500706]
- National Natural Science Fund [30471918, 30570637]
- Shanghai Key Project of Basic Science Research [04DZ14005]
- Program for Outstanding Medical Academic Leader [LJ 06003]
At the neuropathological level, Parkinson's disease (PD) is characterized by the accumulation of mis-folded proteins, which can trigger the unfolded protein response (UPR). UCH-L1 is a component of ubiquitin proteasome system (UPS). It is reported that the loss of its function will impair ubiquitin proteasome system and cause toxicity to cells. But its mechanism has not been illustrated. In this study, we detected the protein expression of Bip/Grp78 and the spliced form of XBP-1 to examine the activation of unfolded protein response after SK-N-SH cells being treated with LDN-57444, a UCH-L1 inhibitor which could inhibit UCH-L1 hydrolase activity. Our data showed that UCH-L1 inhibitor was able to cause cell death through the apoptosis pathway by decreasing the activity of ubiquitin proteasome system and increasing the levels of highly ubiquitinated proteins, both of which can activate unfolded protein response. There is a lot of evidence that unfolded protein response is activated as a protective response at the early stage of the stress; this protective response can switch to a pro-apoptotic response when the stress persists. In this study, we demonstrated this switch by detecting the upregulation of CHOP/Gadd153. Taken together, our data indicated that the apoptosis induced by UCH-L1 inhibitor may be triggered by the activation of endoplasmic reticulum stress (ERS). Moreover, we provide a new cell model for studying the roles of UCH-L1 in Parkinson's disease.
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