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Abstract

Context: Long pepper, Piper longum Linn. (Piperaceae), is widely used in traditional Mongolian medicine for treating hyperlipidemia and coronary heart disease.

Objective: To investigate the hypolipidemic effects of a new piperine derivative GB-N isolated from long pepper in high-fat diet-fed rats.

Methods: The levels of serum total cholesterol, triacylglycerols (TG), low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C) were determined by enzymatic colorimetric method. The levels of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA), CYP7A1, lecithin cholesterol acyltransferase (LCAT) and LDL receptor (LDLR) mRNA and protein expression were detected by real-time polymerase chain reaction and western blot analysis.

Results and discussion: Compared with model rats, oral administration of GB-N at doses of 2.5-10 mg/kg to hyperlipidemic rats could significantly decrease the levels of serum TG from 1.54 mmol/L in hyperlipidemic rats to 0.94-1.02 mmol/L, with an increase in serum HDL-C levels from 0.40 mmol/L in hyperlipidemic rats to 1.21-2.26 mmol/L. Treatment with GB-N (10 mg/kg) could also significantly upregulate levels of hepatic HMG-CoA reductase, CYP7A1, LCAT and LDLR mRNA and protein expression.

Conclusion: GB-N had hypolipidemic activity via regulating lipid metabolism pathways in liver of hyperlipidemic rats and could be explored as a potential agent for the prevention of hyperlipidemia diseases.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Long PepperIncreased HDL CholesterolBeneficial
Large
Long PepperIncreased Hepatic Lipid Metabolism MarkersBeneficial
Moderate
Long PepperReduced Serum Triglyceride LevelsBeneficial
Large

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