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Planta Med 2014; 80(12): 993-1000
DOI: 10.1055/s-0034-1382864
Biological and Pharmacological Activity
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Quercetin, Luteolin, and Epigallocatechin Gallate Promote Glucose Disposal in Adipocytes with Regulation of AMP-Activated Kinase and/or Sirtuin 1 Activity

Na Xiao
1   State Key Laboratory of Natural Medicines, Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing, China
2   Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicines, Nanjing, China
,
Fan Mei
1   State Key Laboratory of Natural Medicines, Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing, China
2   Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicines, Nanjing, China
,
Yan Sun
1   State Key Laboratory of Natural Medicines, Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing, China
2   Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicines, Nanjing, China
,
Guojun Pan
3   Key Laboratory of Industrial Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin, China
,
Baolin Liu
1   State Key Laboratory of Natural Medicines, Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing, China
2   Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicines, Nanjing, China
,
Kang Liu
1   State Key Laboratory of Natural Medicines, Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing, China
2   Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicines, Nanjing, China
› Author Affiliations
Further Information

Publication History

received 17 February 2014
revised 13 June 2014

accepted 16 June 2014

Publication Date:
24 July 2014 (online)

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Abstract

Quercetin, luteolin, and epigallocatechin gallate are flavonoids abundant in edible and medicinal plants with beneficial effects on glucose homeostasis. This study explored the action of these flavonoids on glucose disposal in adipocytes. Quercetin, luteolin, and epigallocatechin gallate enhanced glucose consumption with the positive regulation of AMP-activated kinase phosphorylation, and the AMP-activated kinase inhibitor compound C abolished their effects on glucose consumption. Luteolin and epigallocatechin gallate, but not quercetin, increased sirtuin 1 abundance, and their regulation of glucose consumption was also attenuated by co-treatment with sirtuin 1 inhibitor nicotinamide. Quercetin, luteolin, and epigallocatechin gallate suppressed nuclear factor-κB activation by inhibition of p65 phosphorylation with beneficial regulation of adipokine expression, whereas these actions were diminished by coincubation with compound C. The sirtuin 1 inhibitor nicotinamide attenuated the effects of luteolin and EGCG on p65 phosphorylation and adipokine expression without any influence on the activity of quercetin. Results of Western blot and fluorescence microscopy also showed that quercetin, luteolin, and epigallocatechin gallate increased Akt substrate of 160 kDa phosphorylation and promoted 2-deoxy-D-glucose uptake by adipocytes under basal and inflammatory conditions. These findings suggested that quercetin, luteolin, and epigallocatechin gallate inhibited inflammation and promoted glucose disposal in adipocytes with the regulation of AMP-activated kinase and/or sirtuin 1.

Key words

flavonoids - AMPK - SIRT1 - glucose disposal - adipocytes

Supporting Information

 

  • References

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