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CCL19 and CCL21 induce a potent proinflammatory differentiation program in licensed dendritic cells
Benjamin J Marsland1, Patrick Bättig, Monika Bauer
1Molecular Biomedicine, Department of Environmental Sciences, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland.
Immunity
|April 23, 2005
Summary
Chemokine CCL19 promotes T cell proliferation by maturing dendritic cells (DCs). This chemokine enhances adaptive immunity by regulating DC activation and cytokine production, influencing T helper cell responses.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial for initiating adaptive immune responses.
- Understanding the factors that regulate DC function is vital for controlling immune responses.
Purpose of the Study:
- To identify novel inducers of T cell proliferation.
- To elucidate the role of chemokines in DC maturation and function.
Main Methods:
- Alphaviral expression cloning technology was used to identify CCL19.
- DC-T cell coculture systems were employed to assess T cell proliferation.
- Flow cytometry and cytokine analysis were used to evaluate DC maturation and function.
- Studies in genetically deficient mice (plt/plt) were performed.
Main Results:
- CCL19 was identified as a potent inducer of T cell proliferation.
- CCL19 induced DC maturation, upregulating costimulatory molecules and proinflammatory cytokines.
- CCL19 programmed DCs to promote T helper type 1 (Th1) responses.
- Activated, migrating DCs expressed CCR7 and responded to CCL19, unlike resting DCs.
- Chemokines CCL19 and CCL21 are essential for full DC maturation in vivo.
Conclusions:
- CCL19 and CCL21 act as natural adjuvants for DC activation.
- Chemokines regulate not only DC migration but also their immunogenic potential.
- These findings highlight the critical role of chemokines in shaping T cell-mediated immunity.