Huang-Lian-Jie-Du-Tang Supplemented with<i>Schisandra chinensis</i>Baill. and<i>Polygonatum odoratum</i>Druce Improved Glucose Tolerance by Potentiating Insulinotropic Actions in Islets in 90% Pancreatectomized Diabetic Rats

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  • PARK Sunmin
    Deptartment of Food and Nutrition, College of Natural Science, Hoseo University
  • HONG Sang Mee
    Deptartment of Food and Nutrition, College of Natural Science, Hoseo University
  • AHN Il Sung
    Deptartment of Food and Nutrition, College of Natural Science, Hoseo University
  • KIM Yang Jin
    Naturalbiopharms Co., Ltd.
  • LEE Jung Bok
    Naturalbiopharms Co., Ltd.

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  • Huang-Lian-Jie-Du-Tang Supplemented with Schisandra chinensis Baill. and Polygonatum odoratum Druce Improved Glucose Tolerance by Potentiating Insulinotropic Actions in Islets in 90% Pancreatectomized Diabetic Rats

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We investigated to determine what effects, if any, the respective water extracts of Radix scutellariae (RS), Fructus schisandrae chinensis (FSC), Huang-Lian-Jie-Du-Tang (HLJDT), and HLJDT supplemented with FSC, and Rhizoma Polygonati odorati (HLJDT-M) would have on glucose tolerance by modulating glucose-stimulated insulin secretion, β-cell mass, and morphometry in 90% pancreatectomized (Px) diabetic rats fed high-fat diets. Through the elevation of intracellular cAMP levels, FSC RS, HLJDT, and HLJDT-M increased insulin secretion in Min6 cells and GLP-1 secretion in NCI-H716 cells. After an 8-week period of treatment, it was found that HLJDT-M improved glucose tolerance in an oral glucose tolerance test in Px rats. HLJDT-M also potentiated first- and second-phase insulin secretion, but RS and HLJDT elevated only the second phase at hyperglycemic clamp. RS and HLJDT increased β-cell mass by hyperplasia and hypertrophy, while HLJDT-M increased it only by hyperplasia. The rise in hyperplasia was associated with elevated IRS2 and PDX-1 expression in the islets. In conclusion, HLJDT-M worked as an anti-diabetic prescription by enhancing insulinotropic actions in diabetic rats.

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