Wenping Tang1,2, Shiming Li1, Yue Liu3, Jia-Ching Wu4, Min-Hsiung Pan4, Mou-Tuan Huang3, Chi-Tang Ho2. 1. Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization; College of Life Science, Huanggang Normal University, Huanggang, China. 2. Department of Food Science, Rutgers-The State University of New Jersey, New Brunswick, NJ, USA. 3. Department of Chemical Biology, Rutgers-The State University of New Jersey, Piscataway, NJ, USA. 4. Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan.
Abstract
SCOPE: Functional foods can be used alone or in combination with existing therapies in preventing and treating type 2 diabetes (T2D). Trans-2,3,5,4'-tetrahydroxystilbene 2-O-β-glucopyranoside (trans-THSG), a dominant bioactive compound from Polygonum multiflorum (PM)-a popular medicinal food in Asia, has attracted increasing research interests due to its strong antioxidant activity. The content of naturally occurring cis-THSG (cis-2,3,5,4'-tetrahydroxystilbene 2-O-β-glucopyranoside) was very low in PM root, but was prepared in this study by mimicking the traditional process of PM. The anti-diabetic effects of trans- and cis-THSG were evaluated in T2D to search for more efficacious food ingredient(s). METHODS AND RESULTS: Trans-THSG was chromatographically purified from PM roots and cis-THSG was prepared with our innovative process via exposure of trans-THSG to UV-light. The anti-diabetic effects of both THSGs were tested with HFD-induced male CF-1 diabetic mice. Cis-THSG was found more effective than trans-THSG in hypoglycemic effect and in ameliorating glucose intolerance and insulin resistance. In HepG2 cells, cis-THSG also demonstrated more potent activity than trans-THSG in suppressing transcription of phosphoenopyruvate carboxykinase (PEPCK). CONCLUSION: Cis-THSG can be an enriched bioactive ingredient in PM roots from post-processing and is significantly more effective against hyperglycemia than trans-THSG. One of the effective pathways was through inhibition of PEPCK.
SCOPE: Functional foods can be used alone or in combination with existing therapies in preventing and treating type 2 diabetes (T2D). Trans-2,3,5,4'-tetrahydroxystilbene 2-O-β-glucopyranoside (trans-THSG), a dominant bioactive compound from Polygonum multiflorum (PM)-a popular medicinal food in Asia, has attracted increasing research interests due to its strong antioxidant activity. The content of naturally occurring cis-THSG (cis-2,3,5,4'-tetrahydroxystilbene 2-O-β-glucopyranoside) was very low in PM root, but was prepared in this study by mimicking the traditional process of PM. The anti-diabetic effects of trans- and cis-THSG were evaluated in T2D to search for more efficacious food ingredient(s). METHODS AND RESULTS:Trans-THSG was chromatographically purified from PM roots and cis-THSG was prepared with our innovative process via exposure of trans-THSG to UV-light. The anti-diabetic effects of both THSGs were tested with HFD-induced male CF-1 diabeticmice. Cis-THSG was found more effective than trans-THSG in hypoglycemic effect and in ameliorating glucose intolerance and insulin resistance. In HepG2 cells, cis-THSG also demonstrated more potent activity than trans-THSG in suppressing transcription of phosphoenopyruvate carboxykinase (PEPCK). CONCLUSION:Cis-THSG can be an enriched bioactive ingredient in PM roots from post-processing and is significantly more effective against hyperglycemia than trans-THSG. One of the effective pathways was through inhibition of PEPCK.