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Ze-Hua Zhao,Feng-Zhi Xin,Yaqian Xue,Zhimin Hu,Yamei Han,Fengguang Ma,Da Zhou,Xiao-Lin Liu,Aoyuan Cui,Zhengshuai Liu,Yuxiao Liu,Jing Gao,Qin Pan,Yu Li,Jian-Gao Fan 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
Microbial metabolites have emerged as critical components that mediate the metabolic effects of the gut microbiota. Here, we show that indole-3-propionic acid (IPA), a tryptophan metabolite produced by gut bacteria, is a potent anti-non-alcoholic steatohepatitis (NASH) microbial metabolite. Here, we demonstrate that administration of IPA modulates the microbiota composition in the gut and inhibits microbial dysbiosis in rats fed a high-fat diet. IPA induces the expression of tight junction proteins, such as ZO-1 and Occludin, and maintains intestinal epithelium homeostasis, leading to a reduction in plasma endotoxin levels. Interestingly, IPA inhibits NF-κB signaling and reduces the levels of proinflammatory cytokines, such as TNFα, IL-1β, and IL-6, in response to endotoxin in macrophages to repress hepatic inflammation and liver injury. Moreover, IPA is sufficient to inhibit the expression of fibrogenic and collagen genes and attenuate diet-induced NASH phenotypes. The beneficial effects of IPA on the liver are likely mediated through inhibiting the production of endotoxin in the gut. These findings suggest a protective role of IPA in the control of metabolism and uncover the gut microbiome and liver cross-talk in regulating the intestinal microenvironment and liver pathology via a novel dietary nutrient metabolite. IPA may provide a new therapeutic strategy for treating NASH.
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Yi Luan,Wenbin Zhang,Min Wang,Pei Zhang,Zhimin Xue,Guosheng Fu,Junbo Ge 한국유전학회 2016 Genes & Genomics Vol.38 No.9
The methylenetetrahydrofolate reductase (MTH FR) gene variant 677C?T is considered a risk factor for myocardial infarction (MI) in Caucasians, but it remains unclear whether this applies to Chinese or other Asian populations. A total of 551 controls and 304 age-matched Chinese MI patients were recruited. MTHFR genotypes were determined. A subsequent meta-analysis was performed to determine the association between MTHFR and MI in Asia. Conventional risk factors such as hypertension, diabetes mellitus and low-density lipoprotein exhibited no significant differences between the two groups. Genotype frequencies among cases and controls were compatible with Hardy– Weinberg equilibrium. The frequencies of CC, CT and TT genotypes were 28, 46 and 26 % for patients with MI and 31, 52 and 17 % for the matched control group (p = 0.006). T-allele frequency in MI patients was higher than in controls (49 vs. 43 %, odds ratio = 0.785, 95 % confidence interval = 0.644–0.958, p = 0.017). A total of 16 studies including ours were identified, involving 4053 patients and 6791 controls. A recessive genotype model of MTHFR 677C?T polymorphism, but not a dominant genotypemodel, was significantly associated with greater MIrisk in Asians. MI risk increased 48, 37 and 47 % for the TT homozygote compared with the CC wild type, CT heterozygote and the combination of CT and CC. Thus, we conclude that the MTHFR gene variant 677C?T is a risk factor for MI in the Chinese population and the TT genotype is associated with a significant increase in MI risk in Asia.
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