Related Experiment Videos
Structure and function of the immune semaphorin CD100/SEMA4D.
Abdellah Elhabazi1, Anne Marie-Cardine, Isabelle Chabbert-de Ponnat
1Department of Biology, Faculty of Sciences, El Jadida Morocco.
Critical Reviews in Immunology
|August 9, 2003
Summary
CD100 (also known as SEMA4D) is a semaphorin that modulates immune cell responses. Both its membrane-bound and soluble forms have distinct functions in T-cell activation, B-cell survival, and monocyte migration.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Semaphorins are key regulators of cellular functions, including immune responses.
- CD100 (SEMA4D) is a semaphorin with documented roles in human and murine immune cell regulation.
- Both membrane-bound and soluble forms of CD100 possess distinct functional properties.
Purpose of the Study:
- To review recent advances in understanding human and murine CD100.
- To elucidate the relationship between CD100 structure, expression, and function.
- To discuss the signaling pathways underlying CD100-mediated effects.
Main Methods:
- Literature review of studies on CD100 in humans and mice.
- Analysis of CD100 structure-function relationships.
- Discussion of signaling mechanisms.
Main Results:
- Membrane-bound CD100 provides co-stimulatory signals to T cells via CD45.
- Soluble CD100 promotes T-cell priming and B-cell survival through PlexinB1 and CD72.
- Soluble CD100 induces monocyte paralysis and migration arrest via an unknown receptor.
Conclusions:
- CD100 is a versatile molecule with dual functions mediated by its membrane and soluble forms.
- CD100 signaling pathways are complex and involve interactions with multiple receptors.
- Further research into CD100's structure, expression, and signaling is crucial for understanding its role in immunity and disease.