Batf coordinates multiple aspects of B and T cell function required for normal antibody responses

Area of Science:

• Immunology
• Molecular Biology
• Transcription Factors

Background:

• Batf (Basic leucine zipper transcription factor, ATF-associated) is a member of the Activator Protein 1 (AP-1) superfamily.
• Batf is expressed in T and B lymphocytes, but its specific role in these cells is not fully understood.

Purpose of the Study:

• To investigate the function of Batf in lymphocyte development and immune responses.
• To determine the impact of Batf deficiency on T helper cell subsets and B cell maturation.

Main Methods:

• Generation of Batf-deficient mice (Batf(DeltaZ/DeltaZ)).
• Flow cytometry analysis of T and B lymphocyte populations.
• Antigen immunization and assessment of germinal center formation and antibody production.
• In vitro and in vivo B cell stimulation assays.

Main Results:

• Batf(DeltaZ/DeltaZ) mice exhibit normal B cell numbers but reduced peripheral CD4(+) T cells.
• Batf is essential for the development of functional Th17, Th2, and Tfh cells.
• Absence of germinal centers and impaired Ig-secreting B cell maturation in Batf(DeltaZ/DeltaZ) mice.
• Batf-deficient B cells proliferate but fail to undergo class-switch recombination.

Conclusions:

• Batf plays a critical role in multiple facets of the adaptive immune system.
• Loss of Batf disrupts essential lymphocyte communication, leading to a weakened immune response.
• Batf is required for both T cell-dependent and T cell-independent B cell maturation.