Objective: To investigate whether high-density lipoproteins (HDLs) suppress chemokine (CCL2, CCL5, and CX3CL1) and chemokine receptor (CCR2 and CX3CR1) expression, a mechanism for the atheroprotective properties of HDLs. Methods and Results: Apolipoprotein (apo) E-/- mice were fed a high-fat diet for 12 weeks. Before being euthanized, the mice received 5 consecutive daily injections of lipid-free apoA-I, 40 mg/kg, or saline (control). The injection of apoA-I reduced CCR2 and CX3CR1 expression in plaques compared with controls (P<0.05). ApoA-I-injected mice had lower plasma CCL2 and CCL5 levels. Hepatic CCL2, CCL5, and CX3CL1 levels were also reduced (P<0.05). In vitro studies found that reconstituted HDL (rHDL) reduced monocyte CCR2 and CX3CR1 expression and inhibited their migration toward CCL2 and CX3CL1 (P<0.05). Preincubation with rHDL reduced CCL2, CCL5, and CX3CL1 expression in monocytes and human coronary artery endothelial cells. The stimulation of CX3CR1 with peroxisome proliferator-activated receptor γ agonist CAY10410 was suppressed by preincubation with rHDL but did not affect the peroxisome proliferator-activated receptor γ antagonist (GW9664)-mediated increase in CCR2. In monocytes and human coronary artery endothelial cells, rHDL reduced the expression of the nuclear p65 subunit, IκB kinase activity, and the phosphorylation of IκBα (P<0.05). Conclusion: Lipid-free apoA-I and rHDL reduce the expression of chemokines and chemokine receptors in vivo and in vitro via modulation of nuclear factor κB and peroxisome proliferator-activated receptor γ.
|Number of pages||6|
|Journal||Arteriosclerosis, Thrombosis, and Vascular Biology|
|Publication status||Published or Issued - Sep 2010|
- chemokine receptors
- high-density lipoproteins
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine