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Chemokine and chemokine receptor mRNA expression in human platelets
C A Power1, J M Clemetson, K J Clemetson
1Glaxo Institute for Molecular Biology, Geneva, Switzerland.
Abstract:
In order to study the role of platelets in inflammation we constructed a cDNA library from human platelet mRNA. By polymerase chain reaction (PCR) analysis of the library we have shown that platelets express mRNAs for the following chemokines: connective tissue activating peptide-III (CTAP-III), epithelial-derived neutrophil activating factor-78 (ENA-78), RANTES and monocyte chemotactic protein-3 (MCP-3). Platelets also express mRNAs for interleukin 8 receptor A (IL-8RA) and a novel chemokine receptor K5.5. These results suggest that chemokines may not only play an important role in platelet activation but can also influence the nature of the leukocyte infiltrate to sites of inflammation and infection, by the production of multiple chemokines with overlapping specificities.
Insights
Platelets express messenger RNAs for multiple chemokines and chemokine receptors, suggesting a significant role in inflammation and immune cell recruitment to infection sites.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Platelets are known to play a role in hemostasis and thrombosis.
- Emerging evidence suggests platelets also participate in inflammatory processes.
Purpose of the Study:
- To investigate the role of platelets in inflammation by analyzing their gene expression profile.
- To identify specific chemokines and chemokine receptors expressed by human platelets.
Main Methods:
- Construction of a cDNA library from human platelet mRNA.
- Polymerase Chain Reaction (PCR) analysis to detect specific gene expression.
Main Results:
- Platelets express mRNAs for connective tissue activating peptide-III (CTAP-III), epithelial-derived neutrophil activating factor-78 (ENA-78), RANTES, and monocyte chemotactic protein-3 (MCP-3).
- Platelets also express mRNAs for interleukin 8 receptor A (IL-8RA) and a novel chemokine receptor, K5.5.
- The identified chemokines have overlapping specificities, indicating a complex role in immune responses.
Conclusions:
- Platelets are a source of multiple chemokines, influencing platelet activation.
- Platelet-derived chemokines can modulate leukocyte infiltration at sites of inflammation and infection.
- These findings highlight the significant immunomodulatory function of platelets in inflammatory conditions.