Protective effect of L-carnitine against H(2)O(2)-induced neurotoxicity in neuroblastoma (SH-SY5Y) cells.

Abstract:

OBJECTIVES:4-N-trimethylammonium-3-hydroxybutyric acid (L-carnitine) is an endogenous mitochondrial membrane compound and some studies have reported that L-carnitine could effectively protect various cells against oxidative injury both in vitro and in vivo. In the present study, we used the human neuroblastoma SH-SY5Y cell line as an in vitro model and assessed the effect of L-carnitine on hydrogen peroxide (H(2)O(2))-mediated oxidative stress and neurotoxicity. METHODS:Cells in culture were treated with different concentrations of H(2)O(2) alone or pretreated with L-carnitine. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays, transmission electron microscopy, agarose gel electrophoresis, biochemical methods, and Western blotting were employed in the present study. RESULTS:Pretreatment with L-carnitine for 3 hours inhibited H(2)O(2)-induced cell viability loss, morphological changes, intracellular reactive oxygen species generation, and lipid peroxidation in a concentration-dependent manner. Endogenous anti-oxidant defense components including total anti-oxidative capacity, glutathione peroxidase, catalase, and superoxide dismutase were also promoted by L-carnitine. Meanwhile, H(2)O(2)-induced down-regulation of Bcl-2, up-regulation of Bax, and DNA damage and apoptosis were also inhibited in the presence of L-carnitine. DISCUSSION:Taken together, these results suggest that L-carnitine may function as an anti-oxidant to inhibit H(2)O(2)-induced oxidative stress as well as regulation of Bcl-2 family and prevent the apoptotic death of neuronal cells, which might be beneficial for the treatment of oxidative stress in neurodegenerative diseases.

journal_name

Neurol Res

journal_title

Neurological research

authors

Yu J,Ye J,Liu X,Han Y,Wang C

doi

10.1179/1743132810Y.0000000028

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

708-16

issue

7

eissn

0161-6412

issn

1743-1328

journal_volume

33

pub_type

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