26-Week Repeated Dose Oral Toxicity Study of KCHO-1 in Sprague-Dawley Rats
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Objectives: KCHO-1(Mecasin), also called Gamijakyakgamchobuja-tang originally, is a combination of some traditional herbal medicines in East Asia. This medicine has been used mainly for alleviating neuropathic pains for centuries in Korean traditional medicine. KCHO-1 was developed to treat pain, joint contracture and muscular weakness in patients with amyotrophic lateral sclerosis. This study was carried out to investigate the chronic toxicity of KCHO-1 oral administration in rats for 26 weeks. Methods: Sprague-Dawely rats were divided into four groups and 10 rats were placed in the control group and the high-dose group, respectively. Group 1 was the control group and the remaining groups were the experimental groups. In the oral toxicity study, 500 mg/ kg, 1,000 mg/kg, and 2,000 mg/kg of KCHO-1 were administered to the experimental group, and 10 ml/kg of sterile distilled water was administered to the control group. Survival rate, body weight, feed intake, clinical signs, and visual findings were examined. Urinalysis, ophthalmologic examination, necropsy, organ weight, hematologic examination, blood chemical examination and histopathologic examination were performed. Results: Mortality and toxicological lesions associated with the administration of test substance were not observed in all groups. Conclusion: NOAEL(No observed adverse effect level) of KCHO-1 is higher than 2000 mg/kg/day. And, the above findings suggest that treatment with KCHO-1 is relatively safe.
Abstract
Objectives: KCHO-1(Mecasin), also called Gamijakyakgamchobuja-tang originally, is a combination of some traditional herbal medicines in East Asia. This medicine has been used mainly for alleviating neuropathic pains for centuries in Korean traditional medicine. KCHO-1 was developed to treat pain, joint contracture and muscular weakness in patients with amyotrophic lateral sclerosis. This study was carried out to investigate the chronic toxicity of KCHO-1 oral administration in rats for 26 weeks. Methods: Sprague-Dawely rats were divided into four groups and 10 rats were placed in the control group and the high-dose group, respectively. Group 1 was the control group and the remaining groups were the experimental groups. In the oral toxicity study, 500 mg/ kg, 1,000 mg/kg, and 2,000 mg/kg of KCHO-1 were administered to the experimental group, and 10 ml/kg of sterile distilled water was administered to the control group. Survival rate, body weight, feed intake, clinical signs, and visual findings were examined. Urinalysis, ophthalmologic examination, necropsy, organ weight, hematologic examination, blood chemical examination and histopathologic examination were performed. Results: Mortality and toxicological lesions associated with the administration of test substance were not observed in all groups. Conclusion: NOAEL(No observed adverse effect level) of KCHO-1 is higher than 2000 mg/kg/day. And, the above findings suggest that treatment with KCHO-1 is relatively safe.
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