Training the metaorganism: the microbial counterpart

Area of Science:

• Immunology
• Microbiology
• Infectious Disease

Background:

• Innate immune cells can be reprogrammed by infection or immunization, leading to memory responses and broad protection against subsequent infections, a phenomenon known as trained immunity.
• The role of the commensal microbiota in contributing to trained immunity remains largely unexplored.

Purpose of the Study:

• To investigate whether the commensal microbiota can undergo a 'training' process similar to immune cells.
• To determine if this microbiota training enhances resistance to unrelated infections.

Main Methods:

• The study likely involved experimental models of infection in animals.
• Analysis of changes in the composition and function of the commensal microbiota following acute infection.
• Assessment of colonization resistance against a secondary, heterologous pathogen.

Main Results:

• Acute infection was shown to 'train' the commensal microbiota.
• This microbiota training resulted in enhanced colonization resistance against heterologous infections.
• The findings suggest a novel mechanism of host defense mediated by the microbiota.

Conclusions:

• The commensal microbiota can be trained by infection to provide enhanced protection against subsequent, different infections.
• This represents a new facet of trained immunity, extending beyond immune cells to microbial communities.
• Understanding microbiota training could lead to new strategies for preventing or treating infectious diseases.