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Published on: December 16, 2013
Follicular stromal cells and lymphocyte homing to follicles
J G Cyster1, K M Ansel, K Reif
1Department of Microbiology and Immunology, University of California San Francisco, 94143-0414, USA. cyster@itsa.ucsf.edu
Insights
Follicular dendritic cells (FDCs) present antigens to B lymphocytes. B-lymphocyte chemoattractant (BLC) guides B cells to FDCs, aiding immune responses within lymphoid follicles.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Follicular dendritic cells (FDCs) are key stromal cells in lymphoid follicles, crucial for antigen presentation to B lymphocytes.
- Understanding the cellular interactions within lymphoid follicles is vital for comprehending adaptive immunity.
Purpose of the Study:
- To review the role of B-lymphocyte chemoattractant (BLC) in guiding B cells to FDCs.
- To discuss the properties of BLC-expressing follicular stromal cells and FDCs.
- To propose a model for FDC development incorporating BLC expression and lymphocyte trafficking.
Main Methods:
- Review of existing research on BLC, follicular stromal cells, and FDCs.
- Analysis of chemokine expression patterns and their impact on lymphocyte migration.
- Development of a conceptual model for FDC development and function.
Main Results:
- Follicular stromal cells expressing BLC attract CXCR5+ cells, facilitating contact between motile B cells and stationary FDCs.
- BLC plays a significant role in the spatial organization of immune cells within lymphoid follicles.
- Antigen recognition alters T and B lymphocyte chemokine responsiveness, influencing their movement into or out of follicles.
Conclusions:
- BLC is a critical chemokine mediating B cell localization to FDCs, essential for effective antigen presentation.
- A proposed model integrates BLC expression into FDC development and function.
- Lymphocyte trafficking within lymphoid follicles is dynamically regulated by chemokine responsiveness changes upon antigen recognition.
Abstract:
Follicular dendritic cells (FDCs), the best defined stromal cell subset within lymphoid follicles, play a critical role in presenting intact antigen to B lymphocytes. The discovery that many follicular stromal cells make B-lymphocyte chemoattractant (BLC), a CXC chemokine that attracts CXCR5+ cells, provides a basis for understanding how motile B cells come into contact with stationary FDCs. Here we review our work on BLC and discuss properties of BLC-expressing follicular stromal cells. We also review the properties of primary follicle and germinal center FDCs and suggest a model of FDC development that incorporates information about BLC expression. Finally, we consider how antigen recognition causes T and B lymphocytes to undergo changes in chemokine responsiveness that may help direct their movements into, or out of, lymphoid follicles.
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