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ICOS is critical for CD40-mediated antibody class switching
A J McAdam1, R J Greenwald, M A Levin
1Departments of Pathology, Brigham and Women's Hospital and Harvard Medical School, 221 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|May 9, 2001
Summary
Inducible co-stimulatory molecule (ICOS) is crucial for T-cell activation and B-cell collaboration. ICOS-deficient mice show impaired immunoglobulin class switching, highlighting ICOS's role in immune responses.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Co-stimulatory signals are essential for optimal T-cell activation.
- The inducible co-stimulatory molecule (ICOS) is a CD28 homologue involved in T-cell differentiation.
- Existing co-stimulatory pathways like B7-CD28 do not fully explain T-cell activation.
Purpose of the Study:
- To investigate the essential functions of ICOS in immune responses.
- To determine the role of ICOS in T-cell and B-cell interactions.
Main Methods:
- Generation of ICOS-deficient (ICOS-/-) mice.
- Analysis of immunoglobulin isotype class switching and germinal center formation in ICOS-/- mice.
- Assessment of class switching restoration upon CD40 stimulation.
Main Results:
- ICOS-/- mice exhibited significant deficits in immunoglobulin isotype class switching.
- Germinal center formation was impaired in ICOS-/- mice.
- CD40 stimulation restored class switching in ICOS-/- mice, indicating ICOS's role in T-cell/B-cell collaboration.
Conclusions:
- ICOS plays a critical role in immunoglobulin class switching and germinal center formation.
- ICOS facilitates T-cell/B-cell collaboration, likely through the CD40/CD40L pathway.
- Understanding ICOS function may lead to new therapies for immune-mediated diseases.
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