Abstract: AimTo study the effects of propylene glycol mannate sulfate (PGMS) on monocyte chemoattractant protein-1 (MCP-1) mRNA expression in hyperlipidemic rat aorta and to clarify the molecular mechanism of PGMS for the prevention of atherosclerosis. MethodsPGMS (37.8 and 75.6 mg·kg^-1·d^-1, ig) or PGMS (37.8 and 75.6 mg·kg^-1·d^-1, ig) combined with diethyldithiocarbamate (DDC, an inhibitor of SOD, 200 mg·kg^-1 every three days, ip) were given to hyperlipidemic rats for three weeks. The MDA content and SOD activity were determined after 12 h of starvation, and MCP-1 mRNA expression in aorta was detected by reverse transcription-polymerase chain reaction (RT-PCR). ResultsThere was significant decrease (29.46% or 58.40)% of MCP-1 mRNA expression in aortic after the therapy. The SOD activity increased markedly and the MDA content decreased at the same time. After treatment with DDC, the SOD activity was inhibited and the MDA content increased, but with no significant effect on MCP-1 mRNA expression. ConclusionPGMS inhibited MCP-1 mRNA expression with no relation to its effect on decreasing MDA content.