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The role of gut microbiota in the pathogenesis of colorectal cancer

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  • Published:
Tumor Biology

Abstract

The human gastrointestinal tract harbors a complex and abundant microbial community that can reach levels as high as 1013–1014 microorganisms in the colon. These microorganisms are essential to a host’s well-being in terms of nutrition and mucosa immunity. However, numerous studies have also implicated members of the colonic microbiota in the development of colorectal cancer (CRC). While CRC involves a genetic component where damaged DNA and genetic instability initiates a malignant transformation, environmental factors can also contribute to the onset of CRC. Furthermore, considering the constant exposure of the colonic mucosa to the microbiome and/or its metabolites, the mucosa has long been proposed to contribute to colon tumorigenesis. However, the mechanistic details of these associations remain unknown. Fortunately, due to technical and conceptual advances, progress in characterizing the taxonomic composition, metabolic capacity, and immunomodulatory activity of human gut microbiota have been made, thereby elucidating its role in human health and disease. Furthermore, the use of experimental animal models and clinical/epidemiological studies of environmental etiological factors has identified a correlation between gut microbiota composition and gastrointestinal cancers. Bacteria continuously stimulate activated immunity in the gut mucosa and also contribute to the metabolism of bile and food components. However, the highest levels of carcinogen production are also associated with gut anaerobic bacteria and can be lowered with live lactobacilli supplements. In this review, evidence regarding the relationship between microbiota and the development of CRC will be discussed, as well as the role for microbial manipulation in affecting disease development.

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Abbreviations

CRC:

Colorectal cancer

PCA:

Principle component analysis

IBD:

Inflammatory bowel diseases

TGF-β:

Transforming growth factor-β

ETBF:

Enterotoxigenic Bacteroides fragilis

CECs:

Colonic epithelial cells

BFT:

B. fragilis toxin

PRRs:

Pattern recognition receptors

PAMPs:

Pathogen-associated molecular patterns

TLRs:

Toll-like receptors

NLRs:

Nod-like receptors

NF-κB:

Nuclear factor κB

DMH:

Dimethylhydrazine

SIGIRR:

Single immunoglobulin IL-1 receptor-related molecule

STAT3:

Signal transducer and activator of transcription

MAM:

Metabolite methylazoxymethanol

DCA:

Deoxycholic acid

LCA:

Lithocholic acid

FBA:

Fecal bile acid

PGE2:

Prostaglandin E2

NOC:

Nitroso compounds

IFN-γ:

Interferon-γ

TNF-α:

Tumor necrosis factor-α

CFU:

Colony-forming units

GI:

Gastrointestinal

ROI:

Reactive oxygen intermediate

H2S:

Hydrogen sulfide

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We thank Dr. Huanlong Qin for his critical reading of this manuscript.

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Zhu, Q., Gao, R., Wu, W. et al. The role of gut microbiota in the pathogenesis of colorectal cancer. Tumor Biol. 34, 1285–1300 (2013). https://doi.org/10.1007/s13277-013-0684-4

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  • DOI: https://doi.org/10.1007/s13277-013-0684-4

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