Abstract
Recent studies revealed that alpha-ketoglutarate (A-KG) alone or with sodium thiosulfate (STS) provide significant protection against acute and sub-acute cyanide poisoning in rodents. This study addresses the protective effect of A-KG and/or STS in sub-chronic (90 days) cyanide poisoning. Wistar rats were divided into seven groups (n = 10): Control animals, potassium cyanide (KCN) A-KG, STS, KCN + A-KG, KCN + STS and KCN + A-KG + STS. Spontaneous motor activity and motor coordination were recorded every 15th day. Lipid peroxidation (LPO), reduced glutathione (GSH), glutathione peroxidase (GPx), superoxide dismutase (SOD) and catalase (CAT) in blood, brain, liver and kidney, and glutamate, aspartate and dopamine in discrete regions of brain were measured following 90 days exposure. Cyanide significantly decreased motor coordination, accompanied by increase in LPO (blood, brain and liver) and dopamine (corpus striatum and cerebral cortex) levels, and depletion in GSH (blood, brain and liver), GPx (brain and liver), SOD (brain and liver), and CAT (blood and brain) levels. Although treatment of A-KG and STS alone significantly blunted the toxicity of KCN, concomitant use of both afforded the maximum protection. This study shows a promising role of A-KG and STS as treatment regime for long term cyanide exposure.
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