CN: 32-1845/R
ISSN: 2095-6975
Cite this paper:
YU Xuan, WANG Xin-Pei, LEI Fan, JIANG Jing-Fei, LI Jun, XING Dong-Ming, DU Li-Jun. Pomegranate leaf attenuates lipid absorption in the small intestine in hyperlipidemic mice by inhibiting lipase activity[J]. Chinese Journal of Natural Medicines, 2017, 15(10): 732-739

Pomegranate leaf attenuates lipid absorption in the small intestine in hyperlipidemic mice by inhibiting lipase activity

YU Xuan1, WANG Xin-Pei1, LEI Fan2, JIANG Jing-Fei1, LI Jun3, XING Dong-Ming1, DU Li-Jun1
1 Laboratory of Molecular Pharmacology and Pharmaceutical Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China;
2 School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China;
3 State Key Laboratory of Innovative Drugs and Efficient Energy-saving Pharmaceutical Equipment, Jiangxi University of Chinese Medicine, Nancang 330006, China
Pomegranate leaf (PGL) has a definite role in regulating lipid metabolism. However, pharmacokinetic results show the main active ingredient, ellagic acid, in PGL has lower oral bioavailability, suggesting that the lipid-lowering effect of PGL may act through inhibiting lipid absorption in the small intestine. Our results demonstrated that pomegranate leaf and its main active ingredients (i.e., ellagic acid, gallic acid, pyrogallic acid and tannic acid) were capable of inhibiting pancreatic lipase activity in vitro. In computational molecular docking, the four ingredients had good affinity for pancreatic lipase. Acute lipid overload experiments showed that a large dosage of PGL significantly reduced serum total cholesterol (TG) and triglycerides (TC) levels in addition to inhibiting intestinal lipase activity, which demonstrated that PGL could inhibit lipase activity and reduce the absorption of lipids. We also found that PGL could reverse the reduced tight-junction protein expression due to intestinal lipid overload, promote Occludin and Claudin4 expression in the small intestine, and enhance the intestinal mucosal barrier. In conclusion, we demonstrated that PGL can inhibit lipid absorption and reduce blood TG and TC by targeting pancreatic lipase, promoting tight-junction protein expression and thereby preventing intestinal mucosa damage from an overload of lipids in the intestine.
Key words:    Pomegranate leaf    Lipase activity    Hyperlipidemia    Ellagic acid    Pyrogallic acid   
Received: 2016-12-29   Revised:
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