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Our previous study found that large-leaf yellow tea (LYT) had interesting hypoglycemic activity in high-fat diet-induced obese mice and highly safety in healthy mice. To study the anti-diabetic potential of LYT, the present study further investigated the preventive effects and mechanisms of action of LYT administration on diabetes and diabetic nephropathy in high-fat diet plus streptozotocin-induced diabetic mice. Results showed that LYT infusions (1/100 and 1/50, m/V) as drinking fluid for 4 weeks reduced diabetic polydipsia and polyuria, enhanced glucose tolerance and insulin sensitivity, and lowered fasting blood glucose level. The underlying mechanisms involve downregulation of gluconeogenesis (lower protein levels of TXNIP and FBP and enzyme activity of FBP), upregulation of lipid catabolism (higher protein levels of CPT-1α and PPARα), downregulation of lipogenesis (lower protein level of SREBP-1), and modification of the structure and abundance of gut microbiota to modulate metabolic homeostasis. Moreover, LYT administration prevented diabetic nephropathy, possibly due to reduced glucose-caused osmotic diuresis and lowered levels of renal PKC-β2, NLRP3 as well as membrane PKC-α, AQP2 and glycosylated AQP2 proteins. Taken together, LYT exhibits the activities in alleviating diabetic symptoms, ameliorating glucose and lipid dysmetabolism and fatty liver, and preventing diabetic nephropathy in diabetic mice. These activities may be explored for the prevention and treatment of diabetes in humans.


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Alleviating effects and mechanisms of action of large-leaf yellow tea drinking on diabetes and diabetic nephropathy in mice

Show Author's information Guangshan Zhaoa,b,1Jianyuan Tengb,1Ruixia Dongc,d,1Qiuyan BaneLian YangfKang DufYifei WangbHanlin Pub( )Chung S. Yangg,h( )Zhe Renb( )
Innovation Team of Food Nutrition and Safety Control, College of Food Science & Technology, Henan Agricultural University, Zhengzhou 450002, China
Biology Postdoctoral Research Station, Department of Cell Biology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
College of Horticulture, Jinling Institute of Technology, Nanjing 211169, China
Department of Forestry and Technology, Lishui Vocational and Technical College, Lishui 323000, China
Department of Tea Science, College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China
Guangdong Provincial Engineering Center of Topical Precise Drug Delivery System, School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway 08901, USA
International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei 230036, China

1 These authors contributed equally to this work.

Peer review under responsibility of KeAi Communications Co., Ltd.

Abstract

Our previous study found that large-leaf yellow tea (LYT) had interesting hypoglycemic activity in high-fat diet-induced obese mice and highly safety in healthy mice. To study the anti-diabetic potential of LYT, the present study further investigated the preventive effects and mechanisms of action of LYT administration on diabetes and diabetic nephropathy in high-fat diet plus streptozotocin-induced diabetic mice. Results showed that LYT infusions (1/100 and 1/50, m/V) as drinking fluid for 4 weeks reduced diabetic polydipsia and polyuria, enhanced glucose tolerance and insulin sensitivity, and lowered fasting blood glucose level. The underlying mechanisms involve downregulation of gluconeogenesis (lower protein levels of TXNIP and FBP and enzyme activity of FBP), upregulation of lipid catabolism (higher protein levels of CPT-1α and PPARα), downregulation of lipogenesis (lower protein level of SREBP-1), and modification of the structure and abundance of gut microbiota to modulate metabolic homeostasis. Moreover, LYT administration prevented diabetic nephropathy, possibly due to reduced glucose-caused osmotic diuresis and lowered levels of renal PKC-β2, NLRP3 as well as membrane PKC-α, AQP2 and glycosylated AQP2 proteins. Taken together, LYT exhibits the activities in alleviating diabetic symptoms, ameliorating glucose and lipid dysmetabolism and fatty liver, and preventing diabetic nephropathy in diabetic mice. These activities may be explored for the prevention and treatment of diabetes in humans.

Keywords: Gut microbiota, Diabetes, Diabetic nephropathy, Glucose and lipid metabolism, Large-leaf yellow tea

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Received: 21 April 2021
Revised: 27 May 2021
Accepted: 30 May 2021
Published: 21 March 2023
Issue date: September 2023

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© 2023 Beijing Academy of Food Sciences.

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Acknowledgement

This work was supported by the Open Fund of State Key Laboratory of Tea Plant Biology and Utilization (SKLTOF20200127 and SKLT0F20200108), the Open Fund of Key Laboratory of Tea Plant Resources Comprehensive Development in South Henan Province (HNKLTOF2020005) and the Zhejiang Provincial Basic Public Welfare Research Program Project (LGF20H280007).

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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