LPS-induced release of EGF, GM-CSF, GROα, LIF, MIP-1α and PDGF-AB in PBMC from persons with high or low levels of HDL lipoprotein

We have examined basal and lipopolysaccharide (LPS)-induced release of epidermal growth factor (EGF), granulocyte-macrophage colony-stimulating factor (GM-CSF), growth-regulated peptide alpha (GROα), leukaemia inhibitory factor (LIF), macrophage inflammatory protein-1a (MIP-1α) and platelet-derived growth factor-AB (PDGF-AB) in peripheral blood mononuclear cells (PBMC) from 20 persons with either high (n= 10) or low (n= 10) levels of high-density lipoprotein (HDL). PBMC were incubated with 100 ng LPS/ml for up to 160 h, and showed a significantly higher release of the chemokines GROα (P= 0.04) and MIP-1α (P< 0.01) in persons with high HDL, whereas levels of GM-CSF were similar. Levels of EGF, LIF and PDGF-AB were always low, and remained unaltered during 160 h of incubation. These findings indicate that PBMC from persons with high or low levels of HDL have different functional properties, of importance in cell recruitment and activation.