Behind the scenes with basophils: an emerging therapeutic target

Area of Science:

• Immunology
• Hematology
• Cell Biology

Background:

• Basophils, once considered mast cell equivalents, are now recognized as distinct leukocytes with significant immunomodulatory roles.
• Characterized by deep-purple granules and surface IL-3Rα (CD123), basophils are crucial in allergic inflammation, autoimmunity, and hematological malignancies.
• Interleukin-3 (IL-3) drives basophil development, degranulation, and inflammatory mediator synthesis, including type 2 cytokines.

Purpose of the Study:

• To provide a comprehensive overview of basophil biology, encompassing their identification, functions, and involvement in disease.
• To explore the critical immunoregulatory functions of basophils in both non-malignant and malignant conditions.
• To highlight the potential of targeting basophils for novel immunotherapies.

Main Methods:

• Review of existing literature on basophil biology and function.
• Analysis of phenotypic characteristics and molecular drivers of basophil activity (e.g., IL-3).
• Examination of basophil involvement in allergic responses, autoimmunity, and hematological neoplasms like chronic myeloid leukemia (CML).

Main Results:

• Basophils are key players in bridging innate and adaptive immunity, secreting IL-4 to influence other immune cells.
• Basophil degranulation is a primary source of histamine, exacerbating allergic reactions.
• Basophilia, an increase in circulating basophils, is a diagnostic hallmark of certain myeloid neoplasms, including CML.

Conclusions:

• Basophils possess unique and critical immunomodulatory functions beyond their role in allergic responses.
• Dysregulation of basophil populations and functions is implicated in various diseases, particularly hematological malignancies.
• Targeting basophil-specific pathways offers promising therapeutic avenues for allergic, autoimmune, and malignant disorders.