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Updated: Feb 3, 2026
Isolation of Murine Lymph Node Stromal Cells
Published on: August 19, 2014
A Distinct Subset of Fibroblastic Stromal Cells Constitutes the Cortex-Medulla Boundary Subcompartment of the Lymph
Arata Takeuchi1, Madoka Ozawa1, Yasuhiro Kanda1
1Department of Immunology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
Insights
Researchers discovered a new fibroblastic stromal cell (FSC) subset in lymph nodes (LNs). This unique cell subset in the deep cortex periphery (DCP) influences B cell localization and LN development, revealing a complex stromal framework.
Area of Science:
- Immunology
- Cell Biology
- Anatomy
Background:
- Lymph node (LN) architecture is crucial for immune response regulation.
- Fibroblastic stromal cells (FSCs) form distinct subcompartments within LNs.
- The full diversity and function of FSC subsets remain incompletely understood.
Purpose of the Study:
- To identify novel stromal structures and FSC subsets within the lymph node.
- To characterize the unique properties and functions of newly discovered FSCs.
- To elucidate the role of FSCs in lymph node microenvironment organization.
Main Methods:
- Utilized gene reporter mice to visualize and distinguish FSC subsets.
- Analyzed reporter expression patterns (PDGFRβ, CCL21-ser, CXCL12) to identify FSC populations.
- Investigated B cell localization in relation to specific FSC subsets.
Main Results:
- Identified a novel FSC subset in the deep cortex periphery (DCP) expressing CCL21-ser and CXCL12.
- This DCP FSC subset is characterized by preferential B cell localization.
- Demonstrated that B cell development is essential for the optimal formation of the DCP and medulla.
Conclusions:
- A unique microenvironment exists at the cortex-medulla boundary of the lymph node.
- Distinct FSC subsets contribute to a multi-layered stromal framework within the LN.
- The interplay between FSCs and B cells is critical for lymph node structure and function.
Abstract:
The spatiotemporal regulation of immune responses in the lymph node (LN) depends on its sophisticated tissue architecture, consisting of several subcompartments supported by distinct fibroblastic stromal cells (FSCs). However, the intricate details of stromal structures and associated FSC subsets are not fully understood. Using several gene reporter mice, we sought to discover unrecognized stromal structures and FSCs in the LN. The four previously identified FSC subsets in the cortex are clearly distinguished by the expression pattern of reporters including PDGFRβ, CCL21-ser, and CXCL12. Herein, we identified a unique FSC subset expressing both CCL21-ser and CXCL12 in the deep cortex periphery (DCP) that is characterized by preferential B cell localization. This subset was clearly different from CXCL12highLepRhigh FSCs in the medullary cord, which harbors plasma cells. B cell localization in the DCP was controlled chiefly by CCL21-ser and, to a lesser extent, CXCL12. Moreover, the optimal development of the DCP as well as medulla requires B cells. Together, our findings suggest the presence of a unique microenvironment in the cortex-medulla boundary and offer an advanced view of the multi-layered stromal framework constructed by distinct FSC subsets in the LN.
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