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Nutr Res Pract. 2017 Jun;11(3):180-189. doi: 10.4162/nrp.2017.11.3.180. Epub 2017 May 22.

Increased glucose metabolism and alpha-glucosidase inhibition in Cordyceps militaris water extract-treated HepG2 cells.

Author information

1
Well-being Bioproducts RIC, Kangwon National University, Gangwon 25209, Korea.
2
National Development Institute of Korean Medicine, Gyeongbuk 38540, Korea.
3
Department of Bio-Health Technology, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon, Gangwon 24341, Korea.
4
Department of Biochemistry, Hallym University College of Medicine, Gangwon 24252, Korea.

Abstract

BACKGROUND/OBJECTIVES:

Recent living condition improvements, changes in dietary habits, and reductions in physical activity are contributing to an increase in metabolic syndrome symptoms including diabetes and obesity. Through such societal developments, humankind is continuously exposed to metabolic diseases such as diabetes, and the number of the victims is increasing. This study investigated Cordyceps militaris water extract (CMW)-induced glucose uptake in HepG2 cells and the effect of CMW treatment on glucose metabolism.

MATERIALS/METHODS:

Colorimetric assay kits were used to determine the glucokinase (GK) and pyruvate dehydrogenase (PDH) activities, glucose uptake, and glycogen content. Either RT-PCR or western blot analysis was performed for quantitation of glucose transporter 2 (GLUT2), hepatocyte nuclear factor 1 alpha (HNF-1α), phosphatidylinositol 3-kinase (PI3k), protein kinase B (Akt), phosphorylated AMP-activated protein kinase (pAMPK), phosphoenolpyruvate carboxykinase, GK, PDH, and glycogen synthase kinase 3 beta (GSK-3β) expression levels. The α-glucosidase inhibitory activities of acarbose and CMW were evaluated by absorbance measurement.

RESULTS:

CMW induced glucose uptake in HepG2 cells by increasing GLUT2 through HNF-1α expression stimulation. Glucose in the cells increased the CMW-induced phosphorylation of AMPK. In turn, glycolysis was stimulated, and glyconeogenesis was inhibited. Furthermore, by studying the mechanism of action of PI3k, Akt, and GSK-3β, and measuring glycogen content, the study confirmed that the glucose was stored in the liver as glycogen. Finally, CMW resulted in a higher level of α-glucosidase inhibitory activity than that from acarbose.

CONCLUSION:

CMW induced the uptake of glucose into HepG2 cells, as well, it induced metabolism of the absorbed glucose. It is concluded that CMW is a candidate or potential use in diabetes prevention and treatment.

KEYWORDS:

Cordyceps militaris; antidiabetics; glucokinase; glucose transporter; glycogen

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