Effect of plasma isolated Orexin-A on the regulation of metabolites in male rats

Abstract

This research includes the isolation and purification of Orexin-A from the plasma of healthy human via various biochemical techniques, it was proposed the therapeutic role of orexin on hyperlipidemia and lipid peroxidation and it has been suggested to study the effect of isolated orexin A on the metabolism of lipids and glucose in normal and hyperlipidemic rats, a high level of orexin-A had been found only in second peak (B) isolated by gel filtration chromatography (using Sephadex G-50) and showed (34.5) fold of purification, also, the effect of isolated orexin-A on some clinical parameters had been studied in normal and hyperlipidemic male rats. The rats were injected intraperitoneally with orexin-A at a dose of 1μmol/kg of body weight/day for one month. The results, obtained before treatment and after two and four weeks of treatment, had been showing a significant decrease in the concentration of total cholesterol, triglycerides, low and very low-density lipoprotein cholesterol, glucose, malondialdehyde and hyperinsulinemia, while there was a significant increase in the concentration of high-density lipoprotein cholesterol in normal and hyperlipidemic rats. It was concluded that orexin-A had an important role in regulating the metabolism of glucose and lipids, treatment of hyperinsulinemia and insulin resistance, and decreasing lipid peroxidation in normal and hyperlipidemic rats.

Keywords

• cholesterol
• hyperlipidemic rats
• hypocretin
• orexin-a
• oxa purification