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Related Experiment Video

Updated: Jun 5, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation

Studying Organelle Dynamics in B Cells During Immune Synapse Formation

Published on: June 1, 2019

Marginal zone B cells regulate antigen capture by marginal zone macrophages.

Yuying You¹, Riley C Myers, Larry Freeberg

¹Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

Journal of Immunology (Baltimore, Md. : 1950)

|January 25, 2011

Summary

Marginal zone B cells regulate macrophage receptors crucial for pathogen trapping. Their absence impairs SIGN-R1 expression on macrophages, affecting antigen capture by both cell types.

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Area of Science:

Immunology
Cell Biology

Background:

The spleen's marginal zone (MZ) harbors macrophages expressing pathogen-trapping receptors like scavenger receptor macrophage receptor with a collagenous structure (MARCO) and SIGN-R1.
Previous work indicated reduced SIGN-R1 expression in CD19-deficient mice.

Purpose of the Study:

To investigate the relationship between MZ B cells and SIGN-R1 expression on macrophages.
To understand the functional consequences of altered SIGN-R1 expression on antigen capture.

Main Methods:

Flow cytometry to analyze macrophage populations and receptor expression.
Studies in mice with genetic defects or transient B cell depletion from the MZ.
Assessment of Ficoll capture by macrophages and B cells.

Main Results:

SIGN-R1 is expressed on a subset of MARCO(+) macrophages in the MZ.
Absence of MZ B cells leads to diminished SIGN-R1 expression on these macrophages.
Impaired Ficoll capture by both macrophages and B cells occurs when MZ B cells are absent or recovering.

Conclusions:

MZ B cells play a regulatory role in macrophage SIGN-R1 expression.
This regulation is critical for efficient antigen capture by both macrophages and B cells in the MZ.
B cell presence influences macrophage function in innate immune responses.