TRPC1-mediated Inhibition of 1-methyl-4-phenylpyridinium Ion Neurotoxicity in Human SH-SY5Y Neuroblastoma Cells

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2004 Nov 16

PMID 15542611

Citations 51

Authors

Sunitha Bollimuntha

Brij B Singh

Shaik Shavali

Sushil K Sharma

Manuchair Ebadi

Affiliations

Soon will be listed here.

Abstract

Mammalian homologues of the Drosophila canonical transient receptor potential (TRP) proteins have been implicated to function as plasma membrane Ca(2+) channels. This study examined the role of TRPC1 in human neuroblastoma (SH-SY5Y) cells. SH-SY5Y cells treated with an exogenous neurotoxin, 1-methyl-4-phenylpyridinium ion (MPP(+)) significantly decreased TRPC1 protein levels. Confocal microscopy on SH-SY5Y cells treatment with MPP(+) showed decreased plasma membrane staining of TRPC1. Importantly, overexpression of TRPC1 reduced neurotoxicity induced by MPP(+). MPP(+)-induced alpha-synuclein expression was also suppressed by TRPC1 overexpression. Protection of SH-SY5Y cells against MPP(+) was significantly decreased upon the overexpression of antisense TRPC1 cDNA construct or the addition of a nonspecific transient receptor potential channel blocker lanthanum. Activation of TRPC1 by thapsigargin or carbachol decreased MPP(+) neurotoxicity, which was partially dependent on external Ca(2+). Staining of SH-SY5Y cells with an apoptotic marker (YO-PRO-1) showed that TRPC1 protects SH-SY5Y neuronal cells against apoptosis. Further, TRPC1 overexpression inhibited cytochrome c release and decreased Bax and Apaf-1 protein levels. Interpretation of the above data suggests that reduction in the cell surface expression of TRPC1 following MPP(+) treatment may be involved in dopaminergic neurodegeneration. Furthermore, TRPC1 may inhibit degenerative apoptotic signaling to provide neuroprotection against Parkinson's disease-inducing agents.

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