Microbial-derived metabolites are important mediators of host-microbial interactions. In recent years, the role of intestinal microbial metabolites in colorectal cancer has attracted considerable attention. These metabolites, which can be derived from bacterial metabolism of dietary substrates, modification of host molecules such as bile acids, or directly from bacteria, strongly influence the progression of colitis-associated cancer (CAC) by regulating inflammation and immune response. Here, we review how microbiome metabolites short-chain fatty acids (SCFAs), secondary bile acids, polyamines, microbial tryptophan metabolites, and polyphenols are involved in the tumorigenesis and development of CAC through inflammation and immunity. Given the heated debate on the metabolites of microbiota in maintaining gut homeostasis, serving as tumor molecular markers, and affecting the efficacy of immune checkpoint inhibitors in recent years, strategies for the prevention and treatment of CAC by targeting intestinal microbial metabolites are also discussed in this review.
Humans ; Gastrointestinal Microbiome/physiology* ; Animals ; Carcinogenesis/metabolism* ; Colitis-Associated Neoplasms/microbiology* ; Fatty Acids, Volatile/metabolism* ; Bile Acids and Salts/metabolism* ; Colitis/microbiology*

Objective To compare different beginning time of acid simulation to reduce the acute damage of salivary glands after high-dose of iodine-131 treatment for the post-surgery patient with differentiated thyroid cancer (DTC) and screen out the optimal beginning time of acid simulation .Methods Total 309 cases of post-surgery DTC patients accept high-does ioding-131 treatment (average dose of ioding-131 :4 .28 ± 0 .43 GBq) ,and all patients was divided into three group randomly ,the beginning time of acid stimulation(vitamin C :10 mg per time ,three time a day ,lemonade:50 mL per 2 h) for each group is 2 ,12 and 24 h .Then observe the incidence and time of acute damage of salivary glands for each group .At same time ,we analyses the relation between acute dam-age of salivary glands with sex and age .Results The incidence of acute damage of salivary glands is 13 .21% (2 h) ,24 .51% (12 h) , 26 .73% (24 h)respectively ,the incidence of 2 h is lower than those of 12 h and 24 h obviously(P<0 .05) ,and there is no difference between 12 h and 24 h(P>0 .05) .The occurrence time of acute damage of salivary glands for 84 .85% patients is between 10-24 h .And there is no difference of incidence of acute damage of salivary glands between different sex and age group .Conclusion 2 h maybe the optimal beginning time of acid simulation to reduce the acute damage salivary glands for the post-surgery DTC patients after high-dose iodine-131 treatment in this study .Sex and age are no influence to the occurrence of acute damage of salivary glands .