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Published on: September 9, 2011
CD69 is expressed on Daudi cells in response to interferon-alpha
G A Deblandre1, O Leo, G A Huez
1Département de Biologie Moléculaire, Université Libre de Bruxelles, Belgium.
Cytokine
|January 1, 1992
Summary
Researchers developed a method to identify interferon-induced cell surface proteins, discovering that interferon-alpha and interferon-gamma can induce CD69, a marker of leukocyte activation, on specific cell types.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Interferons (IFNs) are crucial cytokines involved in immune responses.
- Cell surface protein expression can be modulated by various stimuli, including IFNs.
- Characterizing these proteins is essential for understanding cellular function and immune signaling.
Purpose of the Study:
- To develop a method for generating monoclonal antibodies against interferon-induced cell surface proteins.
- To identify and characterize specific proteins induced by interferon-alpha.
- To investigate the role of these proteins in cellular responses and immune activation.
Main Methods:
- Generation of hybridomas through fusion of murine myeloma and spleen cells.
- Screening of hybridomas for antibodies recognizing interferon-alpha-treated Daudi cells.
- Characterization of the target protein (p28/32) using the 2D5 monoclonal antibody.
- Analysis of CD69 expression on various cell types in response to interferon-alpha, interferon-gamma, and phorbol myristate acetate (PMA).
Main Results:
- A hybridoma (2D5) produced an antibody recognizing a 28/32 kDa homodimeric protein (p28/32) induced by interferon-alpha on Daudi cells.
- Interferon-alpha treatment increased p28/32 levels on peripheral blood leukocytes (PBL).
- The 2D5 antibody identified CD69, a leukocyte activation marker, and its induction by interferon-alpha was cell-type specific.
- Interferon-gamma also induced CD69 expression, but with a different pattern than interferon-alpha.
- PMA treatment significantly increased CD69 levels on most cell lines, except epithelial and fibroblastic types.
Conclusions:
- The developed approach successfully identified interferon-induced cell surface proteins.
- CD69 is a key protein induced by interferon-alpha and interferon-gamma, indicating its role in leukocyte activation.
- The differential induction patterns of CD69 by various stimuli highlight context-dependent cellular responses.
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