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Tight control - decision-making during T cell-vascular endothelial cell interaction.

Sonja Firner1, Lucas Onder, Veronika Nindl

  • 1Institute of Immunobiology, Kantonsspital St. Gallen, St. Gallen Switzerland.

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Vascular endothelial cells (ECs) interact with T cells during inflammation. This interaction at lymph nodes differs from inflamed tissues like transplants, influencing immune responses and vascular integrity.

Keywords:
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Area of Science:

  • Immunology
  • Vascular Biology
  • Cellular Biology

Background:

  • Vascular endothelial cells (ECs) are critical in immune responses, including inflammation and coagulation.
  • ECs interact with T cells in an antigen-specific manner, influencing immune reactions.
  • This review focuses on T cell-EC interactions at high endothelial venules (HEVs) and in transplant vasculopathy (TV).

Purpose of the Study:

  • To review EC actions and reactions during acute inflammation.
  • To examine T cell-EC interactions at HEVs and in TV.
  • To elucidate the balance between immune activation and tolerance in T cell-EC interactions.

Main Methods:

  • Review of existing literature on T cell-endothelial cell interactions.
  • Analysis of EC functions in immune regulation.
  • Comparison of T cell-EC interactions at different vascular sites.

Main Results:

  • HEVs facilitate lymphocyte entry into lymph nodes but do not typically activate or tolerize T cells.
  • Inflamed endothelium in conditions like TV upregulates MHC and costimulatory molecules, promoting T cell activation.
  • ECs in inflamed tissues maintain vascular integrity and regulate effector T cells.

Conclusions:

  • Antigen-specific T cell-EC interaction involves a complex balance of immune ignorance, activation, and tolerance.
  • The endothelium plays a dual role in immune responses: facilitating immune cell trafficking and modulating immune activation.
  • Understanding these interactions is crucial for managing inflammatory diseases and transplant rejection.