| خلاصه مقاله | Human organs contain a large number of microorganisms, which play critical roles in human health .The
microbiota, as one of the most important microorganisms, describes the living microorganisms found in a
defined environment, such as oral and gut microbiota. The composition of microbiota varies from site to
site. They play a significant role in preventing numerous diseases and can influence human health by
producing essential metabolites, metabolizing nutrients and several toxins that prevent the pathogenic
invaders, retard their growth producing beneficial microbial products and metabolizing nutrients and toxins
of the invader species. The human gut as one of the most complex community of trillions of commensal
microbes. The gut microbiota serve several functions including fermentation of food, protection against
pathogens(Gut barrier),stimulating immune response, vitamin production. The composition of the gut
microbiota is important for supporting all these functions and staying healthy. The gut microbiota includes
archaea, bacteria, protists, fungi, and viruses. Generally, the gut microbiota is composed of phyla including
Firmicutes, Bacteroidetes, Actinobacteria, Proteobacteria, Fusobacteria, and Verrucomicrobia, among
which Firmicutes and Bacteroidetes are the major types. Cancer remains one of the leading causes of
morbidity and mortality worldwide. Given its widespread prevalence, the identification of new anticancer
drugs is crucial. There are several different strategies that are effective at preventing cancer. The gut
microbiota and their metabolites may induce immunological and cellular pathways to eliminate invading
pathogens and trigger an immune response to prevent cancer. The interaction of the healthy gut microbiota
with stromal cells and epithelial cells, plays innumerable key regulatory functions. Bacteria also produce
potent metabolites single chain fatty acids (SCFAs) i.e., butyrate and propionate that help in the eradication
causing cancer genesis via the activation of innate (myeloid cells) and adaptive (CD4+ and CD8+ cells)
immune response and even activation of program cell death. Therefore, gut microbiota play a critical role
in immunoregulation and in maintaining intestinal health. |