Abstract

FORCATO, Diego Oscar et al. Very low density lipoprotein receptor response to inflammatory stressors. Acta bioquím. clín. latinoam. [online]. 2007, vol.41, n.4, pp.483-490. ISSN 0325-2957.

The regulation of the VLDL receptor (VLDLR) by molecules involved in the inflammation process (lipopolysaccharide, LPS; Concanavalin A, ConA, VLDL or Gemfibrozil) in two cellular types implied in the inflammatory response, hepatocytes (HepG2) and lymphocitary cells from mice spleen (CMB), was studied. Different subpopulations of CMB and HepG2 in different cell cycle phases (G1 and G2/M) were analyzed using flow citometry techniques with propidium iodide, and the VLDLR+ with fluorescent VLDL. In cultures of both cell types, it was observed that 10 to 60% of the cells expressed the VLDLR (VLDLR+ cells) indistinctly of the culture conditions. VLDLR+ cells belonged equally to cells in the quiescent and in the synthesis or mitosis phase of the cell cycle. Challenging them with LPS or ConA an increase in the percentage of VLDLR+ cells was produced. Gemfibrozil treatment decreased the number of resting hepatocytes VLDLR+ but increased significantly (more than twice) the number of hepatocytes VLDLR+ in phase G2/M. In hepatocytes there was almost the same proportion of VLDLR+ cells that were in the G1 or in the G2/M phase of the cell cycle. It is concluded that the study of VLDLR regulation will facilitate the design of new drugs to treat inflammatory diseases.

Keywords : Inflammation; Lipoproteins; Very low density lipoprotein receptor; Gemfibrozil.

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