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Monocyte-platelet complexes on CD14/CD16 monocyte subsets: relationship with ApoA-I levels. A preliminary study
Karim Zouaoui Boudjeltia1, Dany Brohee, Pietrina Piro
1Laboratoire de Médecine Expérimentale (ULB 222 Unit), ISPPC Hopital André Vesale, Montigny-Le-Tilleul, Belgium. karim.zouaoui@chu-charleroi.be
High-density lipoprotein (HDL) and apolipoprotein A-I (ApoA-I) levels are negatively correlated with monocyte-platelet complexes (MPCs), suggesting a role in reducing atherogenesis. The G2 monocyte subset shows higher potential for extravasation, indicating increased involvement in atherosclerotic lesion development.
Area of Science:
- Cardiovascular Biology
- Immunology
- Lipid Metabolism
Background:
- Monocyte adhesion and extravasation are critical in atherogenesis.
- L-selectin (CD62-L) on monocytes and platelet interactions are key.
- High-density lipoprotein (HDL) and apolipoprotein A-I (ApoA-I) exhibit anti-inflammatory effects on monocytes.
Purpose of the Study:
- To investigate the relationship between monocyte-platelet complexes (MPCs), monocyte subsets, and serum ApoA-I/HDL levels in vivo.
- To characterize monocyte subsets involved in MPC formation.
- To explore the potential extravasation capacity of different monocyte subsets.
Main Methods:
- Flow cytometry was used to quantify MPCs (CD42b+ monocytes) in 16 volunteers.
- Monocytes were classified into four subsets (G1-G4) based on CD14 and CD16 expression.
- Serum HDL and ApoA-I levels were measured using standard laboratory methods.
Main Results:
- MPC percentage varied significantly across monocyte subsets (G1=8.1%, G2=21.2%, G3=18%, G4=22.3%; P<.001).
- MPC percentage negatively correlated with ApoA-I levels (R=-0.71, P=.001), particularly in G1 and G2 subsets.
- The G2 subset exhibited the highest MPC percentage and potential for extravasation, linked to CD62-L expression.
Conclusions:
- Serum ApoA-I/HDL levels are inversely associated with MPCs, suggesting a protective role against atherogenesis.
- The G2 monocyte subset, characterized by high CD14/CD16 expression and platelet coating, may be more implicated in atherosclerotic lesion development.
- HDL/ApoA-I does not directly interact with the platelet marker CD42b.
