AIM： To investigate the inhibitory effect of natural taurine （NTau） on portal hypertension （PHT） in rats with experimentally-induced liver cirrhosis （LC）. METHODS： Experimentally-induced LC Wistar rats （20 ra...AIM： To investigate the inhibitory effect of natural taurine （NTau） on portal hypertension （PHT） in rats with experimentally-induced liver cirrhosis （LC）. METHODS： Experimentally-induced LC Wistar rats （20 rats/group） were treated with either oral saline or oral NTau for 6 consecutive weeks. Evaluation parameters included portal venous pressure （PVP）, portal venous resistance （PVR）, portal venous flow （PVF）, splanchnic vascular resistance （SVR） and mean arterial pressure （NAP）. Vasoactive substance levels including nitric oxide （NO）, nitric oxide synthase （NOS） and cyclic guanosine monophosphate （cGMP） were also measured. Histological investigation of type Ⅰ and Ⅲ collagen （COL Ⅰ and Ⅲ） and transforming growth factor-β1 （TGF-β1） was also performed. RESULTS： Treatment with NTau （1） significantly decreased PVP, PVR and PVF, and increased MAP and SVP; （2） markedly increased the vascular compliance and reduced the zero-stress of the portal vein; （3） markedly decreased the amount of NO and cGMP and activity of NOS; and （4） improved the pathological status of the liver tissue and reduced the expression of COL Ⅰ, COL Ⅲ and TGF-β1. CONCLUSION： NTau inhibited the LC-induced PHT by improving hyperdynamic circulation, morphology of liver and biomechanical properties of the portal vein in experimentally-induced LC rats.展开更多
基金Supported by The National Natural Science Foundation of China,Grant,No.30660235Guangxi Science Foundation forYouths,Grant,No.0728080National"11th 5-year"Support Plan of China,Grant,No.2006BAI0802-07
文摘AIM： To investigate the inhibitory effect of natural taurine （NTau） on portal hypertension （PHT） in rats with experimentally-induced liver cirrhosis （LC）. METHODS： Experimentally-induced LC Wistar rats （20 rats/group） were treated with either oral saline or oral NTau for 6 consecutive weeks. Evaluation parameters included portal venous pressure （PVP）, portal venous resistance （PVR）, portal venous flow （PVF）, splanchnic vascular resistance （SVR） and mean arterial pressure （NAP）. Vasoactive substance levels including nitric oxide （NO）, nitric oxide synthase （NOS） and cyclic guanosine monophosphate （cGMP） were also measured. Histological investigation of type Ⅰ and Ⅲ collagen （COL Ⅰ and Ⅲ） and transforming growth factor-β1 （TGF-β1） was also performed. RESULTS： Treatment with NTau （1） significantly decreased PVP, PVR and PVF, and increased MAP and SVP; （2） markedly increased the vascular compliance and reduced the zero-stress of the portal vein; （3） markedly decreased the amount of NO and cGMP and activity of NOS; and （4） improved the pathological status of the liver tissue and reduced the expression of COL Ⅰ, COL Ⅲ and TGF-β1. CONCLUSION： NTau inhibited the LC-induced PHT by improving hyperdynamic circulation, morphology of liver and biomechanical properties of the portal vein in experimentally-induced LC rats.
文摘目的通过观察天然牛磺酸(NT)对肝纤维化大鼠肿瘤坏死因子(TNF)-α表达的影响,研究NT抑制肝细胞炎性状态、延缓肝纤维化进展的相关机制。方法将实验大鼠随机分为对照组、模型组、NT低剂量组(0.3 g/kg)、NT中剂量组(0.6 g/kg)、NT高剂量组(0.9 g/kg),每组15只。对照组给予正常喂养;模型组与NT各组大鼠均给予皮下注射40%CCL4橄榄油溶液3 m L/kg造模,首次剂量5 m L/kg,2次/w,共注射6 w,并饲以高脂饲料;NT各组在造模的同时予天然牛磺酸灌胃,连续给药6 w;实验结束时,称量大鼠体质量和肝脏质量,计算肝体系数,检测大鼠肝功能(ALT、AST、TBIL及ALB)、肝纤维化指标(HA、PCIII、IV-C及LN)、血清TNF-α水平及肝脏组织TNF-αmRNA表达量。结果与模型组相比,NT低剂量组肝体系数差异无统计学意义(P>0.05),NT中剂量组、高剂量组肝体系数明显降低;NT各组肝功能、肝纤维化显著改善,血清TNF-α水平及肝脏组织中TNF-αmRNA表达显著降低。结论NT能维持肝功能、延缓肝纤维化进展,其机制可能与抑制TNF-α相关因子表达,降低炎性介质分泌,减轻炎症反应有关。
