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CD200 and membrane protein interactions in the control of myeloid cells
A Neil Barclay1, Gavin J Wright, Gary Brooke
1Sir William Dunn School of Pathology, University of Oxford, OX1 3RE, Oxford, UK. barclay@molbiol.ox.ac.uk
Abstract:
OX2 (now designated CD200) is a membrane protein expressed by a broad range of cell types. It is the ligand for a receptor restricted to myeloid cells, with the potential to deliver inhibitory signals. This is indicated by the CD200-deficient mouse model, in which myeloid cells are more activated when stimulated immunologically than cells from normal mice. The unusual tissue distribution of CD200 indicates where myeloid cells can be restrictively controlled through cell-cell contact. Recent data on CD200 will be reviewed in the context of other proteins that might have similar roles, in particular, the interaction between CD47 and SIRPalpha (CD172a).
Insights
CD200 (OX2) is a membrane protein that inhibits myeloid cell activation. CD200-deficient mice show increased myeloid cell activity, highlighting CD200's role in controlling these immune cells.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- CD200 (OX2) is a widely expressed membrane protein.
- It acts as a ligand for a receptor found on myeloid cells.
- This interaction can deliver inhibitory signals to myeloid cells.
Purpose of the Study:
- To review recent data on CD200.
- To discuss CD200's role in regulating myeloid cell activity.
- To compare CD200 with other inhibitory proteins like CD47.
Main Methods:
- Review of existing scientific literature on CD200.
- Analysis of data from CD200-deficient mouse models.
- Comparative analysis with CD47/SIRPalpha interaction.
Main Results:
- CD200-deficient mice exhibit heightened myeloid cell activation.
- The tissue distribution of CD200 suggests its role in localized myeloid cell control.
- CD200's inhibitory function on myeloid cells is supported by experimental evidence.
Conclusions:
- CD200 plays a crucial role in regulating myeloid cell function through cell-cell contact.
- The CD200-receptor interaction is a key inhibitory pathway for myeloid cells.
- Understanding CD200 and similar interactions (e.g., CD47/SIRPalpha) is vital for immunology.