Control of Immunity by the Microbiota

Area of Science:

• Immunology
• Microbiology
• Microbiome Research

Background:

• The immune system coevolves with microbial communities (microbiota) at barrier sites.
• Microbial antigens and metabolites continuously interact with the immune system.
• This interaction shapes microbiota-specific immune responses that maintain homeostasis without inflammation.

Purpose of the Study:

• To review innate-like T cell and adaptive immunity to the microbiota.
• To focus on commensal immune recognition across barrier sites.
• To explore the developmental establishment of immune-microbiota cross-talk and its dysregulation.

Main Methods:

• Review of existing literature on immune system-microbiota interactions.
• Focus on fundamental aspects of immune recognition at barrier sites.
• Examination of developmental windows and dysregulation consequences.

Main Results:

• Homeostatic immunity involves B cells, innate-like T cells, and conventional T helper/regulatory cells.
• Microbiota-specific immune responses occur without inflammation.
• Dysregulation of this immune dialogue can lead to disease.

Conclusions:

• Immune system-microbiota interactions are crucial for maintaining health.
• Developmental timing is critical for establishing long-term immune function.
• Further research is needed to address outstanding questions in this field.