Kazinol B from Broussonetia kazinoki improves insulin sensitivity via Akt and AMPK activation in 3T3-L1 adipocytes
- Authors
- Lee, Hyejin; Li, Hua; Jeong, Ji Hye; Noh, Minsoo; Ryu, Jae-Ha
- Issue Date
- Jul-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Broussonetia kazinoki; Diabetes mellitus; Glucose uptake; 3T3-L1; AMPK
- Citation
- FITOTERAPIA, v.112, pp 90 - 96
- Pages
- 7
- Journal Title
- FITOTERAPIA
- Volume
- 112
- Start Page
- 90
- End Page
- 96
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/9719
- DOI
- 10.1016/j.fitote.2016.05.006
- ISSN
- 0367-326X
1873-6971
- Abstract
- In this study, we evaluated the insulin-sensitizing effect of flavans purified from Broussonetia kazinoki Siebold (BK) on 3T3-L1 adipocytes. Among the tested compounds, kazinol B enhanced intracellular lipid accumulation, gene expression of proliferator-activated receptor gamma (PPAR gamma) and CCAAT/enhancer binding protein-alpha (C/EBP alpha), and consistently induced PPAR gamma transcriptional activation. To further investigate the insulin-sensitizing effect of kazinol B, we measured glucose analogue uptake by fully differentiated adipocytes and myotubes. Kazinol B increased 2-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-D-glucose (2-NBDG) uptake by cells by upregulating the gene expression and translocation of glucose transporter 4 (GLUT-4) into the plasma membrane in adipocytes. Kazinol B stimulated the gene expression and secretion of adiponectin, which is associated with a low risk of types 1 and 2 diabetes mellitus. We also suggested the mechanism of the antidiabetic effect of kazinol B by assaying Akt and AMP-activated protein kinase (AMPK) phosphorylation. In conclusion, kazinol B isolated from BK improved insulin sensitivity by enhancing glucose uptake via the insulin-Akt signaling pathway and AMPK activation. These results suggest that kazinol B might be a therapeutic candidate for diabetes mellitus. (C) 2016 Elsevier B.V. All rights reserved.
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