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Nutrients 2017, 9(7), 680; doi:10.3390/nu9070680

Effects of Epigallocatechin-3-Gallate on Autophagic Lipolysis in Adipocytes

1
College of Pharmacy, Yonsei Institute of Pharmaceutical Sciences, Yonsei University, Incheon 21983, Korea
2
Vital Beautie Division, Amorepacific R&D Center, 314-1 Bora-dong, Giheung-gu, Yongin-si, Gyeonggi-do 17074, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 20 May 2017 / Revised: 19 June 2017 / Accepted: 22 June 2017 / Published: 30 June 2017
(This article belongs to the Special Issue Effects of Polyphenol-Rich Foods on Human Health)
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Abstract

Previous studies demonstrated effects of green tea on weight loss; however, green tea-induced modulation of adipocyte function is not fully understood. Here, we investigated effects of the major green tea phytochemical, epigallocatechin-3-gallate (EGCG) on triglyceride contents, lipolysis, mitochondrial function, and autophagy, in adipocytes differentiated from C3H10T1/2 cells and immortalized pre-adipocytes in vitro. EGCG reduced the triglycerol content significantly in adipocytes by 25%, comparable to the nutrient starvation state. EGCG did not affect protein kinase A signaling or brown adipocyte marker expression in adipocytes; however, EGCG increased autophagy, as measured by autophagy flux analysis and immunoblot analysis of LC3B, ATG7, and Beclin1. EGCG treatment reduced mitochondrial membrane potential by 56.8% and intracellular ATP levels by 49.1% compared to controls. Although mammalian target of rapamycin signaling was not upregulated by EGCG treatment, EGCG treatment induced AMP-activated protein kinase phosphorylation, indicating an energy-depleted state. In addition, EGCG increased the association between RAB7 and lipid droplets, suggesting that lipophagy was activated. Finally, knockdown of Rab7 attenuated the EGCG-dependent reduction in lipid contents. Collectively, these results indicated that EGCG upregulated autophagic lipolysis in adipocytes, supporting the therapeutic potential of EGCG as a caloric restriction mimetic to prevent obesity and obesity-related metabolic diseases. View Full-Text
Keywords: green tea; adipocytes; autophagy; epigallocatechin-3-gallate green tea; adipocytes; autophagy; epigallocatechin-3-gallate
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Kim, S.-N.; Kwon, H.-J.; Akindehin, S.; Jeong, H.W.; Lee, Y.-H. Effects of Epigallocatechin-3-Gallate on Autophagic Lipolysis in Adipocytes. Nutrients 2017, 9, 680.

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