白芍总苷对急性肝损伤的保护作用及其可能机制
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摘要
目的:探讨白芍总苷(total glucosides of paeony, TGP)对四氯化碳(carbon
     tetrachloride,CCl_4)致小鼠急性化学性肝损伤和卡介苗(Bacillus Calmette Guerin,BCG)加脂多糖(lipopolysaccharide,LPS)诱导的小鼠免疫性肝损伤模型的保护作用及可能机制。方法:分别建立小鼠化学性和免疫性肝损伤模型,分光光度法检测血清中丙氨酸氨基转移酶(alanine aminotransferase,ALT)、天门冬氨酸氨基转移酶(aspartate aminotransferase,AST)、一氧化氮(nitric oxide,NO)水平和肝匀浆中丙二醛(malondiadehyde,MDA)、超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-px)含量,放免法检测血清中肿瘤坏死因子-α(tumor necrosis factor-alpha,TNF-α)含量,MTT法检测脾淋巴细胞增殖反应。HE染色法对肝脏组织作病理检查。
     结果:1.TGP对化学性肝损伤的保护作用:TGP(60、120、240mg·kg~(-1))ig给药明显降低CCl_4诱导的急性化学性肝损伤小鼠血清升高的ALT、AST水平,病理组织检查亦发现TGP给药后可减轻肝组织坏死范围及程度,减少炎细胞浸润。进一步研究发现TGP可降低肝匀浆升高的MDA水平,同时升高肝匀浆中的SOD和GSH-Px酶活性。2.TGP对免疫性肝损伤的保护作用:TGP(60、120、240mg·kg~(-1))ig给药明显降低BCG加LPS诱导的免疫性肝损伤小鼠血清升高的ALT、AST水平,病理组织检查亦发现TGP给药后可减轻肝组织坏死范围及程度,减少炎细胞浸润。同时还发现TGP可显著降低肝匀浆中升高的MDA水平,提高肝匀浆SOD和GSH-Px水平,TGP(120、240 mg·kg~(-1))可明显降低血清中NO水平,而TGP不同剂量组可明显降低血清中TNF-α水平,并且可抑制腹腔巨噬细胞TNF-α的产生,TGP各个剂量组对ConA诱导的脾淋巴细胞增殖反应具有恢复作用,而对LPS诱导的脾淋
    
    安徽医科大学硕士论文
    细胞巴增殖反应无明显影响。结论:『fGI)对化学性川损伤和免疫性小鼠川二损伤均具
    有保护作用,其机制与其抗自由基、提高抗氧化物酶的活性和免疫调节等有关。
Objective To investigate the effects of total glucosides of paeony (TGP) on carbon
    tetrachloride-induced chemical liver injury and Bacillus Calmette Guerin (BCG) plus
    lipopolysaccharide(LPS)-induced immunological liver injury in mice as well as its
    possible mechanisms.
    Methods The model of chemical liver injury and immunological liver injury in mice was prepared. The levels of alanine aminotransferase(ALT), aspartate aminotransferase(AST) , nitric oxide(NO) in serum, malondiadehyde(MDA) content, superoxide dismutase(SOD) and glutathione peroxidase(GSH-px) activities in liver homogenate were assayed by spectrophotometry; Tumour necrosis factor- a (TNF- a ) activity was determined by ridio immunoassay method. ConA- and LPS- induced splenocytes proliferation was assayed by MTT dye reduction. Meanwhile, hepatic pathological examination was observed.
    Results 1 Protective effect of TGP on carbon tetrachloride-induced chemical liver injury: TGP (60, 120, 240mg kg-1) was able to significantly decrease serum transaminase (ALT, AST) levels of chemical liver injury's mice induced by carbon tetrachloride, attenuate the area and extent of necrosis and reduce the infiltration of inflammatory cells. Furthermore, TGP also decreased MDA content and improved the reduced SOD and GSH-px levels in liver homogenate.2 TGP (60, 120, 240mg kg-1) was able to significantly decrease serum transaminase (ALT, AST) levels of immunological liver injury's mice induced by BCG plus LPS, attenuate the area and extent of necrosis and reduce the infiltration of inflammatory cells. Furthermore, TGP also decreased MDA content and improved the
    
    
    reduced SOD and GSIl-px levels in liver homogenate. Meanwhile, TGP(60, 120, 240mg kg-1) significantly lowered increased TNF-a and TGP(I20, 240mg kg-1) lowered increased NO level in serum . TGP(60, 120, 24()mg kg-1) could reverse LPS or ConA-induced splenocyte proliferation response.
    Conclusion TGP possesses protective action on chemical liver injury and immunological liver injury in mice, which was related to direct with free radical scavenging, increasing the content of SOD and GSH-px, imtnunoloregtilation and so on.
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