VSL#3 probiotic treatment attenuates fibrosis without changes in steatohepatitis in a diet-induced nonalcoholic steatohepatitis model in mice.

VSL#3 probiotic treatment attenuates fibrosis without changes in steatohepatitis in a diet-induced nonalcoholic steatohepatitis model in mice.
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DOI:
10.1002/hep.22711
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发表时间:
2009-03
期刊:
影响因子:
13.5
通讯作者:
Szabo, Gyongyi
Szabo, Gyongyi
中科院分区:
医学1区
文献类型:
--
作者:
Velayudham, Arumugam;Dolganiuc, Angela;Ellis, Michael;Petrasek, Jan;Kodys, Karen;Mandrekar, Pranoti;Szabo, Gyongyi

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非酒精性脂肪肝病 (NAFLD) 及其晚期非酒精性脂肪性肝炎 (NASH) 是美国慢性肝病的最常见原因。 NASH 的特点是代谢综合征、炎症和纤维化。益生菌具有免疫调节和抗炎活性。我们测试了益生菌 VSL#3 可能改善蛋氨酸胆碱缺乏 (MCD) 饮食诱导的 NASH 小鼠模型的假设。与补充蛋氨酸胆碱 (MCS) 饮食喂养相比,MCD 饮食导致 C57Bl6 小鼠出现 NASH,表现为肝脏脂肪变性、甘油三酯增加、炎症细胞积聚、TNFα 增加和纤维化。 VSL#3 未能预防 MCD 诱导的肝脏脂肪变性或炎症。 MCD 饮食,即使存在 VSL#3,也会诱导血清内毒素上调并表达 TLR4 信号成分,包括 CD14 和 MD2、MyD88 接头和 NF-κB 激活。相比之下,VSL#3 治疗可改善 MCD 饮食诱导的肝纤维化,从而减少胶原蛋白和 α-SMA 的积累。我们发现,与单独使用 MCD 饮食相比,喂食 MCD+VSL#3 的小鼠肝脏 PPAR 表达增加,原胶原和基质金属蛋白酶表达减少。 MCD 饮食引发了 TGFβ(一种已知的促纤维化剂)的上调。在 VSL#3 存在的情况下,MCD 饮食诱导的 TGFβ 表达得以维持,然而,具有负调节功能的 TGFβ 假受体 Bambi 的表达增加。总之,我们的数据表明 VSL#3 调节肝纤维化,但不能预防 NASH 中的炎症和脂肪变性。 VSL#3 介导的针对 MCD 饮食诱导的肝纤维化的保护机制可能包括调节胶原蛋白表达和由于 TGFβ 信号传导调节而受损的 TGFβ 信号传导。
Non-alcoholic fatty liver disease (NAFLD) and its advanced stage, non-alcoholic steatohepatitis (NASH), are the most common causes of chronic liver disease in the United States. NASH features the metabolic syndrome, inflammation, and fibrosis. Probiotics exhibit immunoregulatory and anti-inflammatory activity. We tested the hypothesis that probiotic VSL#3 may ameliorate the methionine-choline-defficient (MCD) diet-induced mouse model of NASH. MCD diet resulted in NASH in C57Bl6 mice compared to methionine-choline supplemented (MCS) diet feeding evidenced by liver steatosis, increased triglycerides, inflammatory cell accumulation, increased TNFα, and fibrosis. VSL#3 failed to prevent MCD-induced liver steatosis or inflammation. MCD diet, even in the presence of VSL#3, induced upregulation of serum endotoxin and expression the TLR4 signaling components, including CD14 and MD2, MyD88 adaptor, and NF-κB activation. In contrast, VSL#3 treatment ameliorated MCD diet-induced liver fibrosis resulting in diminished accumulation of collagen and α-SMA. We identified increased expression of liver PPARs and decreased expression of pro-collagen and matrix metalloproteinases in mice fed MCD+VSL#3 compared to MCD diet alone. MCD diet triggered up-regulation of TGFβ, a known pro-fibrotic agent. In the presence of VSL#3 the MCD diet-induced expression of TGFβ was maintained, however, the expression of Bambi, a TGFβ pseudoreceptor with negative regulatory function, was increased. In summary, our data indicate that VSL#3 modulates liver fibrosis but does not protect from inflammation and steatosis in NASH. The mechanisms of VSL#3-mediated protection from MCD diet-induced liver fibrosis likely include modulation of collagen expression and impaired TGFβ signaling owed to modulation of TGFβ signaling.
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发表时间: 1998-11-30
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发表时间: 2001-12-01
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影响因子: 13.5
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