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Secondary lymphoid-tissue chemokine induced modulation of T cells

P F Vitiello1, M P Rausch, K M Horowitz

  • 1Department of Biology, Lafayette College, Easton, Pennsylvania 18042, USA.

Immunological Investigations
|June 16, 2004
PubMed

Insights

Chemokine receptor stimulation, specifically with secondary lymphoid-tissue chemokine (SLC, CCL21), can reduce T cell function, including IFN-gamma production, by affecting TCR signaling pathways.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • T cell receptor (TCR) signaling is crucial for adaptive immunity.
  • Chemokine receptors are known to influence immune cell migration and function.
  • The interplay between chemokine signaling and TCR activation requires further elucidation.

Purpose of the Study:

  • To investigate how chemokine receptor stimulation affects TCR function in splenic T cells.
  • To determine the impact of secondary lymphoid-tissue chemokine (SLC, CCL21) on T cell activation markers and cytokine production.

Main Methods:

  • Splenic T cells were exposed to varying concentrations and durations of SLC (CCL21), CCL2, and CCL5.
  • T cell function was assessed by measuring IFN-gamma production following CD3 crosslinking.
  • T cell viability, IL-4 production, TCR capping efficiency, and ZAP-70 protein expression were analyzed.

Main Results:

  • 72-hour exposure to SLC (CCL21) significantly decreased IFN-gamma production in T cells post-CD3 crosslinking.
  • Similar inhibitory effects on IFN-gamma production were observed with CCL2 and CCL5.
  • The observed decrease in IFN-gamma was not due to reduced T cell viability or increased IL-4 production.
  • Chemokine receptor agonist treatment mimicked the effect, indicating G protein-coupled receptor involvement.
  • Chemokine exposure led to reduced TCR capping efficiency and decreased ZAP-70 protein expression.

Conclusions:

  • Secondary lymphoid-tissue chemokine (SLC, CCL21) can modulate TCR function, leading to impaired T cell activation.
  • Chemokine signaling may downregulate essential proteins like ZAP-70, impacting T cell responsiveness.
  • These findings highlight a novel mechanism by which chemokines influence adaptive immune responses.

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