Immunological Tolerance and Function: Associations Between Intestinal Bacteria, Probiotics, Prebiotics, and Phages

Area of Science:

• Microbiology
• Immunology
• Gastroenterology

Background:

• The intestinal microbiome plays a critical role in host health and disease, with its composition varying significantly.
• Early-life immunological tolerance is essential for lifelong health, influenced by the gut microbiome.
• Probiotic bacteria offer health benefits and may protect against diseases, with applications in high-risk groups.

Purpose of the Study:

• To explore the immunomodulating capabilities of probiotics and prebiotics in the intestinal microbial cohort.
• To investigate the role of bacteriophages in controlling intestinal pathobionts and maintaining homeostasis.
• To identify factors influencing probiotic efficacy, including the microbiome, prebiotics, and the virome.

Main Methods:

• Review of existing literature on probiotics, prebiotics, bacteriophages, and the gut microbiome.
• Analysis of the interplay between intestinal epithelia, mucosal immunity, and bacteriophage activity.
• Consideration of multifactorial dependencies affecting probiotic efficacy.

Main Results:

• Probiotics and prebiotics may dampen pathobiont activity (e.g., *Klebsiella pneumonia*, *Clostridia perfringens*).
• Bacteriophages act as a local defense mechanism, controlling bacterial concentrations and diversity in the gut.
• Probiotic efficacy is likely multifactorial, depending on agents, dose, host factors, and the microbiome/virome.

Conclusions:

• Bacteriophages may contribute to intestinal homeostasis through interactions with mucin glycoproteins.
• The gut virome, alongside the microbiome and prebiotics, could be a key determinant of probiotic efficacy.
• Understanding these complex interactions is vital for optimizing therapeutic strategies targeting the gut microbiome.