Knockdown of uncoupling protein-5 in neuronal SH-SY5Y cells: Effects on MPP+-induced mitochondrial membrane depolarization, ATP deficiency, and oxidative cytotoxicity

Philip Wing Lok Ho, Andrew Chi Yuen Chu, Ken Hon Hung Kwok, Michelle Hiu Wai Kung, David Boyer Ramsden, Shu Leong Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

Uncoupling proteins (UCPs) uncouple oxidative phosphorylation from ATP synthesis by dissipating proton gradient across mitochondrial inner membrane. The physiological role of neuronal specific UCP5 is unknown. We explored the effects of reduced UCP5 expression on mitochondrial membrane potential (MMP), oxidative stress, ATP levels, and cell viability, under normal and MPP +-induced cytotoxic conditions, in human catecholaminergic SH-SY5Y cells. UCP5 expression was reduced by 56% by siRNA, compared to scrambled-siRNA controls. UCP5 knockdown induced apoptosis but did not affect basal levels of ATP, oxidative stress and MMP in the cells under normal conditions. However, UCP5 knockdown increased MPP+-induced cytotoxicity by 15% and oxidative stress levels by 40%, and partially restored MPP+-induced mitochondrial depolarization by 57%. UCP2 and UCP4 expression were unaffected by UCP5 knockdown. Exacerbation of cytotoxicity, oxidative stress and modification of MMP with reduced UCP5 expression in the face of MPP+ toxicity suggest that UCP5 might be physiologically important in the pathology of oxidative stress-induced neurodegeneration.

Original languageEnglish
Pages (from-to)1358-1366
Number of pages9
JournalJournal of Neuroscience Research
Volume84
Issue number6
DOIs
Publication statusPublished - 1 Nov 2006
Externally publishedYes

Keywords

  • ATP
  • Mitochondrial dysfunction
  • MPP
  • Oxidative stress
  • Parkinson's disease
  • Uncoupling protein

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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