Effects of oxidized low-density lipoprotein on expression of type A scavenger receptor in human mesangial cells / 中国医学科学院学报

ABSTRACT

<p><b>OBJECTIVE</b>To explore the regulational effect of oxidized low-density lipoprotein (Ox-LDL) on expression of type A scavenger receptor (SR-A) in human mesangial cells (HMC).</p><p><b>METHODS</b>HMC line (HMCL) with high expression of SR-A (HMCL-SRA) was established after stable transfection of expressive vector with cDNA encoding SR-A. Uptake of Ox-LDL by HMCL was evaluated using Oil Red "O" staining. SR-A mRNA expression was examined using reverse transcription-polymerase chain reaction (RT-PCR).</p><p><b>RESULTS</b>More uptake of Ox-LDL was observed in the HMCL-SRA than that in the untransfected HMCL. Ox-LDL could induce SR-A mRNA expression in HMC in a dose-dependent manner, and reached a peak level after 24 h of stimulation. After 24 h of stimulation with Ox-LDL at the dose of 10, 50 and 100 micrograms/ml, SR-A mRNA expression was up-regulated to 1.35, 1.83 and 2.30-fold of controls, respectively. However, LDL had no effect on the expression of SR-A.</p><p><b>CONCLUSIONS</b>It suggests that SR-A be a major binding receptor to uptake Ox-LDL in HMC. Ox-LDL may promote the progression of chronic renal diseases through up-regulation of SR-A.</p>