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CCL17 and CCL22 attenuate CCL5-induced mast cell migration
M Juremalm1, N Olsson, G Nilsson
1Research Group on Mast Cell Biology, Department of Genetics and Pathology, The Rudbeck Laboratory, Uppsala University, Uppsala, Sweden.
Summary
Chemokines CCL17 and CCL22 regulate mast cell migration via CCR4. These natural ligands inhibit CCL5-induced mast cell (MC) migration, offering insights into allergic inflammation.
Area of Science:
- Immunology
- Cell Biology
Background:
- Mast cells (MCs) are key players in allergic mucosal inflammation.
- Chemokines are critical for recruiting MCs to inflammatory sites.
- Human umbilical cord blood MCs (CBMCs) express CC chemokine receptors CCR1 and CCR4.
Purpose of the Study:
- To investigate the function of CCR4 in MCs.
- To understand the interaction between CCR4 ligands and MC migration.
Main Methods:
- Competition binding assays.
- MC migration assays.
- Intracellular calcium mobilization studies.
- Histamine release assays.
Main Results:
- CCL17/TARC and CCL22/MDC bind to CCR4 and compete with CCL5/RANTES.
- CCL17 and CCL22 act as CCR4 antagonists, inhibiting CCL5-induced MC migration.
- CCL17 and CCL22 induce calcium mobilization but not migration or histamine release.
Conclusions:
- CCL5-induced MC migration via CCR4 is modulated by natural ligands CCL17 and CCL22.
- These findings are relevant to understanding allergic inflammation where CCL17 and CCL22 are upregulated.