Abstract
Aim:
To investigate whether histidine can enhance the anticonvulsant efficacy of carbamazepine (CBZ) and simultaneously improve the spatial memory impairment induced by transauricular kindled seizures in Sprague-Dawley rats.
Methods:
Chronic transauricular kindling was induced by repeated application of initially subconvulsive electrical stimulation through ear-clip electrodes once every 24 h until the occurrence of 3 consecutive clonic-tonic seizures. An 8-arm radial maze (4 arms baited) was used to measure spatial memory, and histamine and γ-amino-butyric acid levels were measured by high performance liquid chromatography (HPLC).
Results:
Chronic transauricular kindling produced a significant impairment of spatial memory and a marked decrease in histamine content in the hypothalamus, the brainstem, and the hippocampus. Injection of histidine (1000 mg/kg or 1500 mg/kg, ip) significantly inhibited transauricular kindled seizures. Injection of histidine at lower doses (200 mg/kg or 500 mg/kg, ip) had no appreciable anticonvulsant effect when administered alone, whereas it significantly potentiated the protective effects of CBZ against kindled seizures. CBZ had no ameliorative effect on memory deficit, but, in contrast, histidine (200 mg/kg or 500 mg/kg, ip) alone or co-administered with CBZ significantly ameliorated the memory deficits induced by the seizures.
Conclusion:
Chronic transauricular kindling is a very useful animal model for evaluating memory deficits associated with epilepsy, and histidine has both a potentiate effect on the anticonvulsant efficacy of CBZ and an ameliorative effect on the spatial memory deficits induced in this model. Histidine at a specific dosage range might serve as a beneficial adjuvant for the clinical treatment of epilepsy, especially when accompanied by impaired spatial memory.
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Project supported by the National Natural Science Foundation of China (No 30371638, 30472013), Natural Science Foundation of Zhejiang Province (No R303779), Scientific Research Foundations of Zhejiang Province (No 2004C34002) and the Scientific Foundation of the Department of Education of Zhejiang Province (No 20040284).
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Li, Q., Jin, Cl., Xu, Ls. et al. Histidine enhances carbamazepine action against seizures and improves spatial memory deficits induced by chronic transauricular kindling in rats. Acta Pharmacol Sin 26, 1297–1302 (2005). https://doi.org/10.1111/j.1745-7254.2005.00220.x
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DOI: https://doi.org/10.1111/j.1745-7254.2005.00220.x
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