Immunomodulatory mechanisms of lactobacilli

Area of Science:

• Immunology
• Microbiology
• Gastroenterology

Background:

• Probiotic organisms like lactobacilli interact with mucosal immune and epithelial cells.
• These interactions modulate the mucosal immune system through well-understood signaling mechanisms.

Purpose of the Study:

• To explore the mechanisms by which lactobacilli and other probiotics interact with host cells.
• To understand how these interactions influence immune responses and barrier functions.

Main Methods:

• In vitro studies using human peripheral blood mononuclear cells and dendritic cells.
• In vivo mechanistic studies in mice.
• Identification of bacterial factors influencing immune responses.

Main Results:

• Cytokine responses vary significantly based on lactobacilli species and strain.
• Bacterial factors like carbohydrates and metabolites influence immune modulation.
• Lactobacilli can enhance barrier functions and regulate inflammatory signaling.

Conclusions:

• Lactobacilli employ diverse mechanisms to modulate host immunity, including T regulatory cell induction and epithelial signaling.
• Further research is needed to elucidate in vivo interactions and the molecular basis of innate signaling by whole bacteria.