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Engineering    2017, Vol. 3 Issue (1) : 110 -114
Research |
The Gut Microbiota, Tumorigenesis, and Liver Diseases
Guishuai Lv1,2,Ningtao Cheng1,Hongyang Wang1,2()
1. International Cooperation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai 200438, China
2. National Center for Liver Cancer, Shanghai 201805, China

In recent decades, diseases concerning the gut microbiota have presented some of the most serious public health problems worldwide. The human host’s physiological status is influenced by the intestinal microbiome, thus integrating external factors, such as diet, with genetic and immune signals. The notion that chronic inflammation drives carcinogenesis has been widely established for various tissues. It is surprising that the role of the microbiota in tumorigenesis has only recently been recognized, given that the presence of bacteria at tumor sites was first described more than a century ago. Extensive epidemiological studies have revealed that there is a strong link between the gut microbiota and some common cancers. However, the exact molecular mechanisms linking the gut microbiota and cancer are not yet fully understood. Changes to the gut microbiota are instrumental in determining the occurrence and progression of hepatocarcinoma, chronic liver diseases related to alcohol, nonalcoholic fatty liver disease (NAFLD), and cirrhosis. To be specific, the gut milieu may play an important role in systemic inflammation, endotoxemia, and vasodilation, which leads to complications such as spontaneous bacterial peritonitis and hepatic encephalopathy. Relevant animal studies involving gut microbiota manipulations, combined with observational studies on patients with NAFLD, have provided ample evidence pointing to the contribution of dysbiosis to the pathogenesis of NAFLD. Given the poor prognosis of these clinical events, their prevention and early management are essential. Studies of the composition and function of the gut microbiota could shed some light on understanding the prognosis because the microbiota serves as an essential component of the gut milieu that can impact the aforementioned clinical events. As far as disease management is concerned, probiotics may provide a novel direction for therapeutics for hepatocellular carcinoma (HCC) and NAFLD, given that probiotics function as a type of medicine that can improve human health by regulating the immune system. Here, we provide an overview of the relationships among the gut microbiota, tumors, and liver diseases. In addition, considering the significance of bacterial homeostasis, we discuss probiotics in this article in order to guide treatments for related diseases.

Keywords Gut microbiota      Dysbiosis      Tumorigenesis      Hepatocellular carcinoma      Nonalcoholic fatty liver disease     
Corresponding Authors: Hongyang Wang   
Just Accepted Date: 21 February 2017   Online First Date: 28 February 2017    Issue Date: 02 March 2017
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Guishuai Lv
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Guishuai Lv,Ningtao Cheng,Hongyang Wang. The Gut Microbiota, Tumorigenesis, and Liver Diseases[J]. Engineering, 2017, 3(1): 110 -114 .
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