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

Authors
  • Kim, Dae Jung1
  • Kang, Yun Hwan2
  • Kim, Kyoung Kon3
  • Kim, Tae Woo1
  • Park, Jae Bong4
  • Choe, Myeon1, 3
  • 1 Well-being Bioproducts RIC, Kangwon National University, Gangwon 25209, Korea. , (North Korea)
  • 2 National Development Institute of Korean Medicine, Gyeongbuk 38540, Korea. , (North Korea)
  • 3 Department of Bio-Health Technology, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon, Gangwon 24341, Korea. , (North Korea)
  • 4 Department of Biochemistry, Hallym University College of Medicine, Gangwon 24252, Korea. , (North Korea)
Type
Published Article
Journal
Nutrition research and practice
Publication Date
Jun 01, 2017
Volume
11
Issue
3
Pages
180–189
Identifiers
DOI: 10.4162/nrp.2017.11.3.180
PMID: 28584574
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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. 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. 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. 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.

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