• Hale Z Toklu, Tayfun Hakan, Hasan Celik, Necat Biber, Can Erzik, Ayliz V Ogunc, Dilek Akakin, Esra Cikler, Sule Cetinel, Mehmet Ersahin, and Goksel Sener.
• Marmara University School of Pharmacy, Department of Pharmacology, Istanbul, Turkey. haletoklu@yahoo.com
• J Spinal Cord Med. 2010 Jan 1;33(4):401-9.

BackgroundOxidative stress is a mediator of secondary injury to the spinal cord following trauma.ObjectiveTo investigate the putative neuroprotective effect of alpha-lipoic acid (LA), a powerful antioxidant, in a rat model of spinal cord injury (SCI).MethodsWistar albino rats were divided as control, vehicle-treated SCI, and LA-treated SCI groups. To induce SCI, a standard weight-drop method that induced a moderately severe injury (100 g/cm force) at T10 was used. Injured animals were given either 50 mg/kg LA or saline at 30 minutes postinjury by intraperitoneal injection. At 7 days postinjury, neurologic examination was performed, and rats were decapitated. Spinal cord samples were taken for histologic examination or determination of malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, and DNA fragmentation. Formation of reactive oxygen species in spinal cord tissue samples was monitored by using a chemiluminescence (CL) technique.ResultsSCI caused a significant decrease in spinal cord GSH content, which was accompanied with significant increases in luminol CL and MDA levels, MPO activity, and DNA damage. Furthermore, LA treatment reversed all these biochemical parameters as well as SCI-induced histopathologic alterations. Conversely, impairment of the neurologic function caused by SCI remained unchanged.ConclusionThe present study suggests that LA reduces SCI-induced oxidative stress and exerts neuroprotection by inhibiting lipid peroxidation, glutathione depletion, and DNA fragmentation.

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