Cloning and characterization of a novel murine macrophage inflammatory protein-1 alpha receptor

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• CC chemokine receptors play crucial roles in immune cell trafficking and inflammatory responses.
• Understanding these receptors is vital for developing targeted therapies for immune-mediated diseases.

Purpose of the Study:

• To clone and characterize a novel CC chemokine receptor from mouse thymus.
• To investigate the binding affinities and functional responses of the cloned receptor to various CC chemokines.

Main Methods:

• Cloning of a novel CC chemokine receptor cDNA from mouse thymus.
• Northern blot analysis to determine tissue-specific mRNA expression.
• Radioligand binding assays using 125I-labeled human RANTES to assess chemokine competition.
• Intracellular calcium mobilization assays in HEK 293 cells expressing the receptor.

Main Results:

• The novel receptor shares significant sequence identity with known CC chemokine receptors.
• mRNA expression was detected in multiple mouse tissues, including thymus, heart, spleen, and liver.
• The receptor exhibited high-affinity binding to murine MIP-1alpha and responded to several other CC chemokines.
• Functional assays confirmed the receptor's ability to mediate intracellular calcium mobilization.

Conclusions:

• The cloned receptor is a high-affinity receptor for murine MIP-1alpha.
• This receptor is likely a key mediator of CC chemokine activity in mice.
• Further research into this receptor could reveal new therapeutic targets for inflammatory conditions.