Role of lymph node stroma and microenvironment in T cell tolerance

Area of Science:

• Immunology
• Cell Biology
• Tissue Engineering

Background:

• Lymph nodes (LNs) are central to immune responses and tolerance.
• Lymph node stromal cells (LN SCs) compartmentalize LNs and establish chemokine gradients (CCL19, CCL21) guiding immune cell migration.
• LN SCs dynamically modulate the microenvironment to support immune cell priming and activation.

Purpose of the Study:

• To review the current understanding of lymph node stromal cell (LN SC) subsets in regulating T cell tolerance.
• To discuss the roles of fibroblastic reticular cells, lymphatic endothelial cells, and blood endothelial cells in T cell homeostasis and tolerance.
• To highlight advancements in bioengineering and clinical practices for manipulating LN SCs to induce T cell tolerance.

Main Methods:

• Review of existing literature on LN SCs and T cell tolerance.
• Analysis of the mechanisms by which LN SCs present antigens and regulate T cell migration.
• Discussion of emerging bioengineered materials and clinical strategies for LN microenvironment manipulation.

Main Results:

• LN SC subsets act as scaffolds, supporting T cell homeostasis and regulating immune cell fate.
• LN SCs contribute to tolerance by presenting peripheral tissue antigens to CD4+ and CD8+ T cells.
• Understanding LN SCs' integration of immunological cues is key to shaping immune responses.

Conclusions:

• LN SCs play a critical role in maintaining T cell tolerance through structural and functional contributions.
• Targeting LN SCs and their microenvironment offers potential therapeutic strategies for autoimmune diseases and graft rejection.
• Further research into LN architecture and SC function will advance tolerance induction therapies.