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Isolation of Mouse Lung Dendritic Cells
Published on: November 22, 2011
RANTES-induced chemokine cascade in dendritic cells
1Department of Pathology, Harvard Medical School, Dana Farber Cancer Institute, 200 Longwood Avenue, Boston, MA 02115, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|July 24, 2001
Summary
Chemokines like RANTES activate dendritic cells (DCs), prompting them to release inflammatory mediators and amplify immune responses. This chemokine-induced activation in DCs may prolong inflammation and enhance both innate and acquired immunity.
Area of Science:
- Immunology
- Cell Biology
- Inflammation Research
Background:
- Dendritic cells (DCs) are potent antigen-presenting cells (APCs) crucial for activating naive T cells.
- Chemokines are known for their role in immune cell trafficking but their direct activating role on DCs is less understood.
Purpose of the Study:
- To investigate the role of chemokines as activating agents for immature dendritic cells.
- To determine the specific mediators induced by chemokine stimulation of DCs.
- To explore the implications of chemokine-induced DC activation on immune responses.
Main Methods:
- Murine bone marrow-derived dendritic cells (DCs) were treated with the CC chemokine RANTES.
- Gene expression analysis (transcripts) and protein synthesis of various mediators were measured.
- Responses were tested across different cell types and chemokine receptor knockout models.
Main Results:
- RANTES induced rapid production of pro-inflammatory mediators, including CXC chemokines (KC, MIP-2) and CC chemokines (MIP-1beta, MIP-1alpha), as well as cytokines (TNF-alpha, IL-6) at transcript and protein levels.
- RANTES treatment also upregulated an orphan chemokine receptor (Eo1) and showed autoinduction of RANTES transcripts.
- Responses were chemokine-specific, with DCs showing limited response to eotaxin and no response to several other tested chemokines; TNF-alpha-treated DCs lost responsiveness to RANTES.
Conclusions:
- Chemokines, specifically RANTES, can act as potent activating agents for immature dendritic cells.
- RANTES-mediated chemokine amplification in DCs may prolong inflammatory responses and modulate the immune microenvironment.
- This mechanism potentially enhances both innate and acquired immune responses, highlighting a novel role for chemokines in immune activation.
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