Neutrophil trafficking to lymphoid tissues: physiological and pathological implications

Area of Science:

• Immunology
• Cell Biology

Background:

• Neutrophils were traditionally viewed as short-lived innate immune cells primarily involved in acute microbial responses and tissue damage.
• Recent evidence challenges this dogma, highlighting neutrophils' complex roles beyond acute inflammation.

Purpose of the Study:

• To review mechanisms of neutrophil trafficking into lymphoid tissues.
• To provide an overview of neutrophil immunoregulatory functions in adaptive immunity during health and disease.

Main Methods:

• Literature review focusing on neutrophil migration and immunomodulatory functions.
• Analysis of studies investigating neutrophil interactions with lymphocytes.

Main Results:

• Neutrophils migrate to lymphoid compartments, influencing lymphocyte activation and suppression.
• Neutrophils produce cytokines that regulate T and B cell survival, proliferation, and function.
• Distinct neutrophil phenotypes with immunomodulatory roles in chronic inflammatory conditions are emerging.

Conclusions:

• Neutrophils play significant roles in adaptive immunity, challenging their traditional classification.
• Understanding neutrophil functions in lymphoid tissues is crucial for comprehending immune homeostasis and diseases like autoimmunity and cancer.