鬼针草总黄酮对免疫性肝纤维化大鼠治疗作用及部分机制研究
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摘要
肝纤维化是以星状细胞(HSC)激活,细胞外基质(ECM)的合成大于降解导致肝内ECM过度沉积为特征的病理过程,是肝硬化的早期和必经阶段。导致肝纤维化的因素有很多,如病毒、药物、乙醇、缺氧、免疫因素等,都可损伤肝脏,造成炎症、细胞坏死、凋亡,进而发展成肝纤维化。现在研究认为,肝纤维病理过程是可逆的,因此寻找合适药物抑制和治疗肝纤维化具有重要意义。
     鬼针草,菊科,鬼针草属,一年生草本植物。其药材资源非常丰富,广泛分布在我国大多数地区。鬼针草药用历史悠久,味苦、性平而无毒,具有清热解毒,散瘀消肿等功效,民间用于治疗痢疾、腹泻、肝炎、胃痛等疾病,文献显示鬼针草的醇提物有抗炎、清除自由基和免疫调节等作用。鬼针草活性成分很多,包括黄酮苷、皂苷、生物碱、挥发油等,经我院天然药物化学教研室研究确定,从鬼针草叶中提取的鬼针草总黄酮(total flavones of Bidens bipinnataL,TFB)为其有效部位。我们前期实验发现,TFB对CCl_4诱导的小鼠肝损伤和大鼠化学性肝纤维化均有显著的治疗作用,但对大鼠免疫性肝纤维化是否有作用尚不清楚。为进一步探讨TFB的药理作用,本文在查阅大量文献和前期研究基础上,采用猪血清诱导的大鼠免疫性肝纤维化模型方法,研究TFB对免疫性肝纤维化的治疗作用和部分机制。
     1.TFB对免疫性肝纤维化大鼠的治疗作用
     48只大鼠,随机分为正常组、模型组、TFB 160 mg/kg、TFB 80 mg/kg、TFB 40mg/kg等6组,每组8只。除正常组外,其余各组采用腹腔注射猪血清(0.5 ml/只,每周2次)诱导免疫性肝纤维化模型,共12周,病理组织学检查造模情况。检验造模成功后,给药组分别灌服相应的受试药物,正常组和模型组灌服等容量的生理盐水,疗程10周。处死大鼠,常规方法取血、肝脏、脾脏等组织备检。研究发现,与模型组相比,TFB能增加大鼠体重,抑制肝纤维化大鼠肝、脾指数上升;能降低血清中升高的ALT、AST、HA、LN、PCⅢ、CⅣ和肝组织中Hyp含量;病理组织学结果显示TFB组肝脏组织结构明显改善,肝纤维化增生程度减轻。提示TFB对猪血清所致大鼠免疫性肝纤维化有明显的治疗。
     2.TFB对免疫性肝纤维化治疗作用的部分机制研究
     与模型组比较,TFB能显著降低肝组织中MDA含量,升高肝组织中SOD和GSH-Px活性;免疫组织化学法显示,TFB组显著抑制肝组织中α-SMA、TGF-β1蛋白表达;RT-PCR显示TFB组抑制TGF-β1/Smads通路中TGF-β1,smads2 mRNA表达,升高smads7 mRNA表达;TUNEL和α-SMA双染检验细胞凋亡,显示TFB显著减少活化的HSC数目,可检测到其凋亡。提示TFB治疗实验性肝纤维化的作用可能与其抗脂质过氧化损伤和抑制TGF-β1/Smads通路减少体内HSC活化及诱导体内活化的HSC凋亡有关。
     结论:以上实验结果表明,TFB对猪血清诱导的大鼠肝纤维化具有明显的治疗作用,其作用机制可能与抗氧化、抑制TGF-β1/Smads信号通路及诱导体内活化的HSC凋亡有关。
Liver fibrosis is result from the majority of chronic liver,which is characterized by acute liver injury,activating of HSC,increasing and deposition of extracellular matrix in the liver.It is mostly induced by viral hepatitis,alcoholism,iron overload,or drug toxicity. So it is very important clinical significant to control the development and process of liver injury in time.In summary,accumulating evidence suggests that liver fibrosis is reversible and that recovery from cirrhosis may be possible.However,it is still difficult to achieve satisfied therapeutic effect.
     Bidens bipinnata L.,a species of the genus Bidens(Compositae),is widely distributed in majority province in China.Bidens bipinnata L.had been traditionally used for many years.It is bitter in taste,neutral in nature and innocuity,and has the effect of heat-clearing, detoxicating and eliminating stasis to subdue swelling.It was largely used to treat hepatitis, inflammation,malaria,hypertension,diabetes,pepticulcer,snake bite,smallpox.Previous report show it has anti-inflammatory,removal of oxygen free radicals and the regulation of the immune.It contains many chemical compositions,such as flavonoid glycoside,saponin,alkaloid, aetherolea.Our previous study show its mainly active composition is total flavones of Bipinnata L (TFB),which is extracted from the leaves of Bidens pilosa L.TFB has been preliminarily assessed to be of protection against acute liver injury and experimental liver fibrosis by CCl_4.To further explore the effect of total flavones of Bidens Bipinnata L(TFB) on immunological liver fibrosis,the immunological model was induced by pig serum in Sprague-Dawley rats.The mechanisms of action of TFB on liver fibrosis by using the methods in vivo and molecular levels were studied.
     The main contents were divided into some sections as follows:
     1.Therapeutic effects of TFB on pig serum-induced liver fibrosis
     The pig serum was injected into abdominal cavity(0.5 ml,twice a week) for 12 weeks so as to induce hepatic fibrosis,and then the rats were treated with TFB daily for 10 weeks and killed at the 22~(nd) week.Compared with model group,TFB increased weight and inhibited the elevation of index of liver and spleen.Furthermore,TFB treatment significantly reduced ALT,AST,HA,LN,PCⅢ,CⅣcontent in serum and Hyp in liver tissue.Liver histopathological examination showed TFB could also ameliorate fibrogenesis and pseudolobule formation by hematoxylin-eosin(HE) staining and masson staining. These results suggest that TFB has positively preventive effects and treatment effects on immunological liver fibrosis by pig serum.
     2.The mechanisms of Therapeutic effects of TFB on immunological liver fibrosis
     Further study showed that TFB treatment markedly reduced MDA in liver tissue, increased SOD,GSH-Px activity.TFB treatment decreased the expression of protein TGF-β1,α-SMA mRNA in liver by Immunohistochemistry.And then TFB treatment could significantly down-regulated TGF-β1 and Smads2 mRNA expression and up-regulated Smads7 mRNA expression in liver by RT-PCR analysis.In addition TFB treatment decreased the number of activated HSC and increased the quantity of apoptosis HSC by TUNEL andα-SMA staining.
     Conclusion:TFB significantly had therapeutical effect on immunological liver fibrosis in rats probably by its free-radical scavenging ability,inhibition of HSC TGF-β1/Smads pathway,suppressive effects on HSC proliferation and collagen production,stimulation of activated HSC apoptosis.
引文
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