Advanced glycation end products-induced gene expression of scavenger receptors in cultured human monocyte-derived macrophages.

We investigated the effects of advanced glycation end products (AGEs) on the expression of oxidized low-density lipoprotein (OxLDL) receptors in human monocyte-derived macrophages and THP-1 cells treated with PMA. Both RT-PCR procedure and Northern blot analysis revealed that AGEs induced not only the gene expression of two major OxLDL receptors, macrophage scavenger receptor (MSR) class A and CD36, but also MSR-B I and lectin-like oxidized low-density lipoprotein receptor 1. Also, as a result of gel shift assay, AGEs increased transcriptional activities of AP-1, NF-kappaB, and peroxisome proliferator-activated receptor gamma. These findings indicate that AGEs-induced enhancement of these transcriptional activities might be involved in increased levels of mRNA for some of OxLDL receptors in THP-1-cells treated with PMA. The upregulated surface expression of these receptors on macrophage membranes was closely associated with increased uptake of modified LDL, and culminated in enhanced foam cell transformation. Thus, AGEs may be involved in the cause of variable levels of foam cell formation via the increased numbers of OxLDL receptors in accelerated atherosclerotic lesions of individuals with diabetes.