The metabolic benefits of Polygonum hypoleucum Ohwi in HepG2 cells and Wistar rats under lipogenic stress.
Inhibition of acetyl-CoA carboxylase (ACC) is one approach used for treating metabolic syndrome. Using partially purified ACC to screen herbs commonly used in Taiwanese folk medicine, we previously showed that an ethanol extract of Polygonum hypoleucum Ohwi (EP) had potent ACC inhibitory activity and partially alleviated metabolic disorders induced by a high fat diet. Since ACC plays a crucial role in de novo lipogenesis, the favorable effects of EP on metabolism were tested under lipogenic conditions in the present study. On incubating high glucose (30 mM)-stimulated HepG2 cells with EP (72.5 or 145 microg/mL), ACC and fatty acid synthase activity, triacylglycerol content, and microsomal triacylglycerol transfer protein mRNA levels were all significantly reduced (P < 0.05, vs vehicle). When EP was given at low, medium, and high dosages (94, 188, and 470 mg/kg) to sucrose water-treated Wistar rats for four weeks, alleviation of symptoms associated with metabolic syndrome, including obesity, insulin resistance, hypertriglyceridemia, and hypertension, accompanied by hepatic ACC inactivation, was seen in the low dosage group. Four compounds (emodin, emodin-8-O-beta-D-glucopyranoside, (+)-catechin, and (-)-epicatechin) isolated from EP were identified as ACC inhibitors. These results confirm that P. hypoleucum Ohwi, acting partly through ACC inhibition, has favorable effects in alleviating metabolic disturbances occurring under lipogenic conditions.
Chao
Pei-Min
PM
Institute of Nutrition, China Medical University, Taichung, Taiwan. pmchao@mail.cmu.edu.tw
Kuo
Yueh-Hsiung
YH
Lin
Yu-Shun
YS
Chen
Chi-Hua
CH
Chen
Shiow-Wen
SW
Kuo
Yao-Haur
YH
D000103:Acetyl-CoA Carboxylase / Q000378:metabolism; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics; D002460:Cell Line; D064429:Fatty Acid Synthases / Q000378:metabolism; D006801:Humans; D050356:Lipid Metabolism; D010936:Plant Extracts / Q000494:pharmacology*; D028502:Polygonum / Q000737:chemistry*; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar; D014280:Triglycerides / Q000378:metabolism
D002352:Carrier Proteins; D010936:Plant Extracts; D012333:RNA, Messenger; D014280:Triglycerides; C106092:microsomal triglyceride transfer protein; D064429:Fatty Acid Synthases; D000103:Acetyl-CoA Carboxylase