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Published on: September 9, 2011
Both human alpha/beta and gamma interferons upregulate the expression of CD48 cell surface molecules
C Tissot1, C Rebouissou, B Klein
1Institute de Genetique Moleculaire de Montpellier-UMR 9942, France.
Summary
Interferons (IFN) upregulate CD48 expression on human cells, potentially enhancing immune cell interactions. This study identifies CD48 as a novel IFN-regulated gene involved in immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Interferons (IFN) are crucial signaling molecules in the immune system.
- CD48 is a glycosyl-phosphatidylinositol-linked (GPI) membrane glycoprotein with known roles in murine T cell activation.
- The function of human CD48 and its regulation by IFNs were previously unknown.
Purpose of the Study:
- To identify novel interferon-regulated genes in human cells.
- To investigate the effect of interferons on the expression of CD48.
- To explore the potential role of CD48 in interferon-mediated immune modulation.
Main Methods:
- Differential screening of a cDNA library from IFN-treated human lymphoblastoid Daudi cells.
- Isolation and characterization of the human CD48 cDNA.
- Analysis of CD48 mRNA and protein expression in various human cell lines and peripheral blood mononuclear cells following IFN treatment.
- Comparison of IFN effects on CD48 and LFA-3 expression.
Main Results:
- A human cDNA encoding the GPI-linked membrane glycoprotein CD48 was isolated.
- Both human IFN-alpha/beta and IFN-gamma increased CD48 mRNA levels and surface protein expression in cultured human cell lines.
- IFNs did not affect LFA-3 expression.
- IFNs upregulated CD48 expression on CD3+, CD14+, and CD19+ peripheral blood mononuclear cell subpopulations.
Conclusions:
- Human CD48 is a novel interferon-regulated gene.
- Interferons enhance CD48 expression, suggesting a role in modulating immune cell interactions.
- IFN-induced CD48 expression may promote MHC-unrestricted interactions between target cells and immune cells.
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