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Related Experiment Videos

Bradykinin B1 receptor expression and function on T lymphocytes in active multiple sclerosis.

A Prat1, L Weinrib, B Becher

  • 1Neuroimmunology Unit, Montreal Neurological Institute, McGill University, the Multiple Sclerosis Clinic, Montreal, Canada. aprat@po-box.mcgill.ca

Neurology
|December 22, 1999
PubMed
Summary

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Bradykinin B1 receptors are upregulated on T lymphocytes in multiple sclerosis (MS) patients. Targeting these receptors with an agonist can reduce T-cell migration, offering a potential therapeutic strategy for MS.

Area of Science:

  • Neuroimmunology
  • Cellular immunology
  • Pharmacology

Background:

  • Multiple sclerosis (MS) lesion development involves inflammatory cell migration into the central nervous system, mediated by endothelial cell-lymphocyte interactions.
  • The bradykinin B1 receptor (B1R), a G protein-coupled receptor, is upregulated on various cell types during inflammation.

Purpose of the Study:

  • To investigate the expression and functional role of the bradykinin B1 receptor on T lymphocytes in patients with multiple sclerosis.
  • To determine if B1R signaling influences T-cell migration in the context of MS.

Main Methods:

  • Multiplex polymerase chain reaction amplification and Western blot were used to confirm B1 receptor expression on T cells.
  • A modified Boyden chamber assay assessed the impact of B1 receptor agonists and antagonists on T-cell migration in vitro.

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Main Results:

  • T lymphocytes from MS patients showed upregulated B1 receptor expression, particularly in active relapse stages (secondary progressive and relapsing-remitting MS).
  • Expression was lower in remission and in control subjects with other inflammatory conditions.
  • In vitro, B1 receptor agonists significantly inhibited the migration of T lymphocytes from MS patients.

Conclusions:

  • Bradykinin B1 receptors are demonstrably upregulated on T lymphocytes during multiple sclerosis.
  • Signaling via the B1 receptor using an agonist can inhibit T-cell migration in vitro, suggesting a potential therapeutic target for MS.