Role of peroxisome proliferator-activated receptors gamma related signaling pathway in the development of rat hyperlipidemia / 中华老年医学杂志

ABSTRACT

ObjectiveTo investigate the role of peroxisome proliferator-activated receptor gamma (PPARγ)/Caspase-8/Caspase-3 signaling pathway in the development of hyperlipidemia in rats.Methods 60 healthy male SD rats 〔4-week old,weight (110 ± 10) g〕 were randomly divided into control group,high-fat diet group,folic acid group,vitamin B12 group,folic acid and vitamin B12 group.After one week's feeding for adaptability,the groups of foloc acid,vitamine B12 and foloc acid + vitamineB12 were dealt with intraperitoneal injection of folic acid (0.5 mg/d),vitamin B12 (0.05mg/d),and folic acid (0.5 mg/d) plus vitamin B12 (0.05 mg/d),respectively,and fed with high fat diet simultaneously.Control group was dealt with intraperitoneal injection of normal saline (0.5 ml/d)and fed with normal diet.High-fat diet group was only fed with high fat diet.Reverse transcription polymerase chain reaction (RT-PCR) was used to measure the mRNA level of PPARy,Caspase-8 and Caspase-3 in aorta abdominalis dissected at 17 weekends.Results Folic acid alone or jointed with vitamin B12 could effectively increase the level of PPARγ,while decrease the mRNA levels of Caspase8 and Caspase-3 as compared with high-fat diet group (P＜0.05),and folic acid plus vitamin B12 was more effective than folic acid alone (P＜0.05).Conclusions Folic acid alone or joined with vitamin B12 can improve the mRNA levels of PPARγ,Caspase-8 and Caspase-3 in vascular wall to protect endothelial injury from hyperlipidemia.