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绞股蓝皂甙对复发性口腔溃疡大鼠T淋巴细胞亚群和抗氧化酶的影响
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摘要
目的:
     建立大鼠复发性口腔溃疡(ROU)动物模型,探讨T淋巴细胞亚群,氧自由基与复发性口腔溃疡发病机制的关系及观察绞股蓝皂甙对大鼠复发性口腔溃疡动物模型的免疫调节和抗氧化作用。为绞股蓝皂甙治疗复发性口腔溃疡的实验研究和临床应用提供一定的理论依据。
     方法:
     用免疫方法(异体大鼠口腔黏膜匀浆组织加完全弗氏佐剂脊柱两侧皮下注射)建立大鼠复发性口腔溃疡动物模型并观察大鼠的口腔表现。切取正常及溃疡大鼠的口腔黏膜组织,HE染色病理检查。将实验大鼠随机分为4组:正常对照组、模型组、左旋咪唑组和绞股蓝皂甙组。分别于造模后、给药后大鼠眼眶采血,用流式细胞仪检测大鼠外周血T淋巴细胞亚群CD4~+、CD8~+细胞比例及CD4~+/CD8~+比值;分别用黄嘌呤氧化酶法、DINB显色法和硫代巴比妥酸法检测大鼠血清中的超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSHPx)的活性和脂质氧化终产物丙二醛(MDA)的含量。
     结果:
     1.实验大鼠于第三次注射一周后开始出现口腔溃疡;病理组织检查见黏膜上皮内淋巴细胞浸润,溶解破溃,固有层内中性粒细胞、淋巴细胞及单核细胞等炎症细胞大量浸润,溃疡底部及上皮下毛细血管扩张充血,腺体增生形成溃疡。
     2.模型组与正常对照组相比,大鼠外周血中CD4~+细胞比例及CD4~+/CD8~+明显降低,有显著性差异(P<0.05),CD8~+也有降低但无显著性差异;实验大鼠给药后,绞股蓝皂甙组和左旋咪唑组与模型组相比,大鼠外周血中CD4~+细胞比例及CD4~+/CD8~+明显升高(P<0.05),CD8~+也有升高但无显著性差异;两组之间比较没有显著性差异。
     3.模型组与正常对照组相比,大鼠血清中SOD和GSHPx的活性明显降低,MDA含量明显升高,有显著性差异(P<0.05);实验大鼠给药后,左旋咪唑组与模型组相比,大鼠血清中SOD的活性升高,GSHPx活性和MDA含量降低,但无显著性差异;绞股蓝皂甙组与模型组相比,大鼠血清中SOD和GSHPx的活性明显升高,MDA含量明显降低,有显著性差异(P<0.05),两组之间比较有显著性差异(P<0.05)。
     结论:
     1.复发性口腔溃疡模型组大鼠外周血中CD4~+细胞比例及CD4~+/CD8~+较正常对照组降低,进一步证实了复发性口腔溃疡的发病与T淋巴细胞亚群失衡有关。
     2.复发性口腔溃疡模型组大鼠血清中SOD和GSHPx的活性较正常对照组降低、MDA含量较正常对照组升高,提示复发性口腔溃疡的发病与氧自由基损伤有关。
     3.绞股蓝皂甙治疗后,CD4~+细胞比例及CD4~+/CD8~+较正常对照组升高,SOD和GSHPx的活性较正常对照组升高,MDA含量较正常对照组降低,绞股蓝皂甙对大鼠复发性口腔溃疡动物模型有一定的免疫调节和抗氧化作用,免疫调节作用与左旋咪唑无显著差异,但抗氧化作用明显优于左旋咪唑。
     4.绞股蓝皂甙用于复发性口腔溃疡的治疗具有一定的开发前景。
Objective:
     Established the rat’s recurrent oral ulceration(ROU)models and discussed the relationsip between T- lymphocyte substock,oxygen radical and the pathogenesis of recurrent oral ulceration and evaluated the immune regulation and antioxidative effects of Gypenoside(GPs) on ROU.In order to provide certain theory basis of Gypenoside(GPs)’s experiment and clinical research.
     Methods:
     Rats models of recurrent oral ulceration with immunology were established(Add Freund’s complete adjuvant(FCA) to galacta of health variant rat’s oral mucosa as the antigen, and injected it to two sides of spinal column);Cut the oral mucosa of normal and ulcer rats,and make Hematoxylin-eosin(HE) staining pathology examination;The rats were randomly divided into 4 groups,including control group,modelgroup,Levamisole group and Gypenoside group. Drawing blood from the eyes of rats while around the model was established and after administration.The changes of CD4~+,CD8~+ in blood were observed using flow - cytometre before and after the model as well as after the therapy.The activity of superoxide dismutase(SOD) was measured in all specimens of rats by xanthine oxidase method.The activity of glutathione peroxidase(GSHPx)was measured in all specimens of rats by DTNBdevelopment process.The activity of catalase(CAT) was measured in all specimens of rats by visible spectrometry.The contents of malondialdehyde(MDA) was measured in all specimens of rats by thiobarbituric acid method.
     Results:
     1.Histologically,infiltration of intraepithelial lymphocytes,dissolved ulceration,a large number of inflammatory cell infiltration in lamina propria,capillary congestion expansion,gland hyperplasia,the ulcers were formed.
     2.Compared with control group, the values of CD4~+and CD4~+/CD8~+ showed significantly lower level in ROU rats (P<0.05),while CD8~+ not.After Levamisole and Gypenoside treatment,the values of CD4~+ and CD4~+/CD8~+ increased significantly (P<0.05),It did not show any significant difference among the two groups.
     3.The activity of SOD and GSHPx of ROU rats was significantly lower than the control group (P<0.05).The contents of MDA was significantly higher than the control group(P<0.05).After treatment,The activity of SOD and GSHPx of Gypenoside group was significantly higher than the control group(P<0.05).The contents of MDA was significantly lower than the control group (P<0.05).The activity of SOD of Levamisole group was higher than the control group,but no significant difference.The activity of GSHPx and the contents of MDA was lower than the control group,but no significant difference.
     Conclusion:
     1.Compared with control group,the values of CD4~+ and CD4~+/CD8~+ showed significantly lower level in ROU rats,suggesting that The unbalance of T-lymphocyte substock may contribute to ROU incidence.
     2.The activity of SOD and GSHPx of ROU rats was significantly lower than the control group. The contents of MDA was significantly higher than the control group,suggesting that oxygen radical may contribute to ROU incidence.
     3.GPs had the immune regulation and antioxidative effects on experimental ROU rats,and the immune efficacy is as same as Levamisole,but the antioxidative effects excelled Levamisole.
     4.GPs had definite developing prospect for curing ROU.
引文
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