EGCG Upregulates UCP3 Levels to Protect MIN6 Pancreatic Islet Cells from Interleukin-1β-Induced Apoptosis
Received 1 July 2020
Accepted for publication 6 September 2020
Published 13 October 2020 Volume 2020:14 Pages 4251—4261
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Yan Zhu
Xu Jia,1,* Ziren Luo,2,* Ying Gao,3 Hua Liu,3 Xinghai Liu,3 Wenli Mai,3 Hong Liu,3 Qian Zheng3
1Department of Pharmacy, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, People’s Republic of China; 2School of Pharmacy, North Sichuan Medical College, Nanchong 637000, People’s Republic of China; 3Department of Physiology, North Sichuan Medical College, Nanchong 637007, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Qian Zheng
Department of Physiology, North Sichuan Medical College, Nanchong, 637007, People’s Republic of China
Objective: The protective effects of epigallocatechin gallate (EGCG) on interleukin-1β (IL-1β)-induced apoptosis were investigated in murine MIN6 pancreatic β-cells. The role of uncoupling protein-3 (UCP3) signaling in this process was also explored.
Methods: After treatment with IL-1β and EGCG, cells were collected and analyzed. Cell viability was measured using the CCK8 assay and the function of β-cells was evaluated by analyzing insulin secretion. Detection of mitochondrial function in cells was performed by measuring mitochondrial membrane potential, the concentration of ATP and activity of ROS. Apoptosis was analyzed by Hochest33258 staining and flow cytometry. Expression levels of UCP3 were interrogated using immunohistochemistry, RT-PCR and Western blotting.
Results: Compared with the control group, IL-1β treatment (20nM) for 24 h significantly decreased cell viability and insulin secretion, damaged mitochondrial function and increased ROS activity. Results also showed increased apoptosis and a decrease in UCP3 expression levels (p< 0.01). However, treatment with low (1mM) or high (5mM) concentrations of EGCG significantly decreased IL-1β-induced apoptosis (p< 0.01), restored mitochondrial function and subsequently increased UCP3 levels in IL-1β-induced β-cells (p< 0.01).
Conclusion: These results suggest that EGCG protects against IL-1β-induced mitochondrial injury and apoptosis in β-cells through the up-regulation of UCP3.
Keywords: EGCG, pancreatic β-cells, apoptosis, UCP3
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