Autopolyreactivity Confers a Holistic Role in the Immune System

Area of Science:

• Immunology
• Microbiology
• Systems Biology

Background:

• The immune system, particularly B-cells, possesses the remarkable ability to recognize a vast array of endogenous and environmental antigens.
• This recognition is primarily mediated by autopolyreactive humoral and cellular immune receptors.
• The concept of natural autoantibodies and their role in immune system function is an evolving area of research.

Purpose of the Study:

• To review key findings on naturally occurring autoantibodies.
• To discuss the role of autopolyreactivity in immune system's recognition capabilities.
• To explore the relationship between natural autoantibodies, commensal microbes, and host-microbe homeostasis.

Main Methods:

• Review of existing literature on naturally occurring autoantibodies.
• Analysis of the mechanisms underlying B-cell recognition and immune receptor function.
• Discussion of the impact of microbiota on immune system development and natural autoantibody activity.

Main Results:

• Autopolyreactive immune receptors enable the recognition of numerous self and non-self constituents, contributing to a vast immune network.
• This immune network facilitates communication between the organism's internal and external environments, allowing continuous adaptation to stimuli.
• Natural autoantibodies are significantly influenced by the presence or absence of commensal microbes, highlighting the importance of host-microbe homeostasis.
• Low-affinity autopolyreactive immune receptors are essential for maintaining homeostasis by recognizing self-antigens and commensal microbes without causing damage.

Conclusions:

• The immune system, through natural autoantibodies and autopolyreactivity, plays a holistic role in maintaining organismal balance, akin to the nervous system.
• Host-microbe homeostasis, regulated by natural autoantibodies, is fundamental for proper immune system development and function.
• The continuous evolution of the immune system is driven by internal and external stimuli, mediated by a complex network of immune receptors.