A Metabolic Model of Intestinal Secretions: The Link between Human Microbiota and Colorectal Cancer Progression

Area of Science:

• Microbiome research
• Systems biology
• Cancer biology

Background:

• The human gut microbiota is crucial for health and disease, including colorectal cancer (CRC).
• High-throughput data reveal microbial alterations impact CRC initiation and progression.
• Microbiome and human cells interact dynamically, necessitating integrated study.

Purpose of the Study:

• To model community microbiomes across CRC progression stages (carcinoma, adenoma, health).
• To investigate how microbial population shifts influence intestinal secretions.
• To understand the role of microbial metabolites in CRC development.

Main Methods:

• Genome-scale metabolic modeling was employed.
• Community microbiome models were constructed for three distinct conditions.
• Analysis focused on microbial metabolite production and consumption.

Main Results:

• Microbial alterations can transform adenomas into carcinomas via mutagenic metabolites (e.g., H2S, TMA) and reduced butyrate.
• The CRC microbiome influences inflammation, angiogenesis, and apoptosis through specific metabolite changes (e.g., histamine, pyruvate).
• Distinct microbial metabolite profiles were identified for healthy, adenoma, and carcinoma states.

Conclusions:

• Gut microbiome alterations are implicated in CRC pathogenesis.
• Specific microbial metabolites play key roles in cancer initiation, progression, and prevention.
• Targeting the gut microbiome presents a potential therapeutic avenue for CRC.