太子参醇提物对大鼠听性脑干反应阈及其相关因素的影响

目的:观察太子参醇提物(EPHPH)对自然衰老模型大鼠听性脑干反应(ABR),耳蜗组织中丙二醛(MDA)、超氧化物歧化酶(SOD)、一氧化氮合酶(NOS)及分型一氧化氮合酶(iNOS)的影响,探讨其对老年性聋的作用及其机制。方法:自然衰老模型大鼠分别灌胃给予太子参2.16、4.32及8.64g·kg-1·d-1的醇提物,每日1次,共6个月,分别测定自然衰老模型大鼠ABR,耳蜗组织中MDA、SOD、NOS及iNOS。结果:自然衰老模型大鼠ABR阈值明显升高,并伴有耳蜗组织中MDA明显升高,SOD、NOS及iNOS活力明显下降。相关性分析表明,ABR阈值升高与耳蜗组织中MDA升高呈正相关;与SOD、NOS及iNOS活力明显下降均呈负相关。自然衰老模型大鼠灌胃太子参2.16、4.32及8.64g·kg-1·d-1的醇提物,能不同程度对抗ABR阈值升高及耳蜗组织中MDA升高,其量效关系均呈负相关;能不同程度抑制SOD、NOS和iNOS活力降低,其量效关系均呈正相关。结论:EPHPH可减轻老年性聋程度,其机制可能与清除耳蜗组织中氧自由基,提高SOD及NOS活力有关。

The effects of EPHPH on acoustic brainstem response threshold and its relative factors of senile model rats

OBJECTIVE: The effect of EPHPH on aged deafness and its mechanism was explored by observing the effects of EPHPH on acoustic brainstem response threshold (ABRT), malondialdehyde (MDA), superoxide dismutase (SOD), total-nitrogen monoxide (NOS) and typing-nitrogen monoxide (iNOS) in cochleae tissues of senile model rats. METHOD: ABRT value was measured by induced potentiometer, MDA was measured by TBA colorimetry, SOD was determined by nitrite method, NOS and iNOS was determined by spectrophotometry in cochleae tissues of senile model rats that separately administered by gavage the alcoholic extract from 2.16, 4.32 or 8.64 g x kg(-1) x d(-1) PHPH once a day for 6 months. RESULT: ABRT value and MDA content notably increased, activities) of SOD, NOS and iNOS notably decreased in cochlear tissues of senile model rats from control. It indicated on relative analysis that relativity between ABRT value ascent and MDA ascent showed positive, relativities between ABRT value ascent and activity descents of SOD, NOS and iNOS showed all negative. It differently resisted ABRT value ascent and MDA ascent in cochlear tissues that senile model rats separately administered the alcoholic extract from 2.16, 4.32 or 8.64 g x kg(-1) x d(-1) PHPH whose relativities between quantity and efficiecy showed all negative. It differently inhibited activity descents of SOD, NOS and iNOS in cochlear tissues that senile model rats separately administered various doses of EPHPH whose relativities between quantity and efficiecy showed all positive. CONCLUSION: EPHPH may relieve the degree of aged deafness and its mechanism may be connected with eliminating oxyen free radicals and increasing the activities of SOD, NOS and iNOS in cochleae of natural senile rats.