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[Effect of macrophage colony-stimulating factor on complement receptors and complement regulatory proteins on human
R Nakahara1, S Takemura, H Onodera
1First Department of Internal Medicine, Kyoto Prefectural University of Medicine.
Abstract:
The effect of M-CSF and C5a on the expression of complement-related membrane proteins on the peripheral white blood cells was investigated. M-CSF or C5a was added into the suspension of the peripheral white blood cells. The expression of the complement receptors, CD35 (CR1) and CD11b/18 (CR3), and inhibitory membrane proteins, DAF and MCP, was measured by flow cytometry. M-CSF increased CR3 on polymorphonuclear cells (PMNs) and CR1, CR3, MCP and DAF on monocytes. C5a increased CR1, CR3 and DAF on PMNs, but did not affect the expression of those on monocytes. It is concluded that M-CSF possessed the activity of increase expression of both complement regulatory proteins and complement receptors of monocytes and C5a selectively affected the expression of those on PMNs.
Insights
Macrophage colony-stimulating factor (M-CSF) boosts complement receptors and regulatory proteins on monocytes, while C5a selectively impacts polymorphonuclear cells (PMNs). This research clarifies how these factors influence white blood cell complement-related membrane proteins.
Area of Science:
- Immunology
- Cell Biology
Background:
- Peripheral white blood cells express complement receptors and regulatory proteins.
- Understanding how immune factors modulate these proteins is crucial for immune response research.
Purpose of the Study:
- To investigate the effects of M-CSF and C5a on complement-related membrane proteins on peripheral white blood cells.
- To differentiate the impact of M-CSF and C5a on polymorphonuclear cells (PMNs) and monocytes.
Main Methods:
- Peripheral white blood cells were incubated with M-CSF or C5a.
- Flow cytometry was used to measure the expression of complement receptors CD35 (CR1) and CD11b/18 (CR3), and inhibitory proteins DAF and MCP.
Main Results:
- M-CSF increased CR3 on PMNs and CR1, CR3, MCP, and DAF on monocytes.
- C5a increased CR1, CR3, and DAF on PMNs but did not affect monocyte expression.
- M-CSF demonstrated broader effects on monocytes, while C5a showed selective effects on PMNs.
Conclusions:
- M-CSF enhances both complement regulatory proteins and complement receptors on monocytes.
- C5a selectively modulates complement-related membrane proteins on PMNs.
- These findings highlight differential regulation of complement proteins by M-CSF and C5a on distinct immune cell types.