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Liu H, Niu T, Qiu G, Cui S, Zhang D. Taurine promotes insulin synthesis by enhancing Isl-1 expression through miR-7a/RAF1/ERK1/2 pathway. In Vitro Cell Dev Biol Anim 2024; 60:23-35. [PMID: 38117455 DOI: 10.1007/s11626-023-00835-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 11/04/2023] [Indexed: 12/21/2023]
Abstract
It has been well established that the circulating taurine affects the insulin synthesis in pancreatic islet β-cells, whereas miR-7a and LIM-homeodomain transcription factor Isl-1 are important intracellular factors regulating insulin transcription and synthesis. However, it still remains unknown whether taurine regulates insulin synthesis by affecting miR-7a and/or Isl-1 expressions in mouse pancreatic islet β-cells. The present study was thus proposed to identify the effects of taurine on the expressions of miR-7a and/or Isl-1 and their relations to insulin synthesis in mouse pancreatic islet β-cells by using miR-7a2 knockout (KO) and taurine transporter (TauT) KO mouse models and the related in vitro experiments. The results demonstrated that taurine supplement significantly decreased the pancreas miR-7a expression, but sharply upregulated the pancreas Isl-1 and insulin expressions, and serum insulin levels. However, the enhanced effects of taurine on Isl-1 expression and insulin synthesis were mitigated in the TauT KO and miR-7a2 KO mice. In addition, our results confirmed that taurine markedly increased pancreas RAF1 and ERK1/2 expressions. Collectively, the present study firstly demonstrates that taurine regulates insulin synthesis through TauT/miR-7a/RAF1/ERK1/2/Isl-1 signaling pathway, which are crucial for our understanding the mechanisms of taurine affecting insulin synthesis, and also potential for establishing the therapeutic strategies for diabetes and the diseases related to metabolism.
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Affiliation(s)
- Hui Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
| | - Tongjuan Niu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
| | - Guobin Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
| | - Sheng Cui
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, People's Republic of China
| | - Di Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China.
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou, 225009, Jiangsu, People's Republic of China.
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, Jiangsu, People's Republic of China.
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Li L, Zhang J, Lu C, Wang B, Guo J, Zhang H, Cui S. MicroRNA-7a2 Contributes to Estrogen Synthesis and Is Modulated by FSH via the JNK Signaling Pathway in Ovarian Granulosa Cells. Int J Mol Sci 2022; 23:ijms23158565. [PMID: 35955699 PMCID: PMC9369042 DOI: 10.3390/ijms23158565] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/28/2022] [Accepted: 07/30/2022] [Indexed: 11/22/2022] Open
Abstract
MicroRNA-7a2 (miR-7a2) plays fundamental roles in the female reproductive axis, and estrogen is indispensable for maintaining ovary function. However, the interaction between miR-7a2 and ovarian function is unclear. The present study aimed to determine whether and how miR-7a2 functions in estrogen synthesis. Firstly, the results verified that miR-7a was highly expressed in ovarian granulosa cells. The knockout (KO) of miR-7a2 caused infertility and abnormal ovarian function in mice. Concomitantly, the Cyp19a1 expression and estrogen synthesis were significantly inhibited, which was validated in primary granulosa cells. The mice transplanted with miR-7a2 KO ovaries showed similar results; however, estrogen supplementation reversed infertility. In the in vitro experiment, follicle-stimulating hormone (FSH) significantly improved the expression of miR-7a and Cyp19a1 and the synthesis of estrogen. However, the miR-7a2 KO markedly reversed the function of FSH. Also, FSH upregulated miR-7a by activating the (c-Jun N-terminal kinase) JNK signaling pathway. In addition, Golgi apparatus protein 1 (Glg1) was shown to be the target gene of miR-7a2. These findings indicated that miR-7a2 is essential for ovarian functions with respect to estrogen synthesis through the targeted inhibition of the expression of Glg1 and then promoting Cyp19a1 expression; the physiological process was positively regulated by FSH via the JNK signaling pathway in granulosa cells.
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Affiliation(s)
- Liuhui Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
| | - Jinglin Zhang
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou 225009, China;
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Chenyang Lu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
| | - Bingjie Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
| | - Jiajia Guo
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
| | - Haitong Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
| | - Sheng Cui
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (L.L.); (C.L.); (B.W.); (J.G.); (H.Z.)
- Institute of Reproduction and Metabolism, Yangzhou University, Yangzhou 225009, China;
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Correspondence:
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Li L, Lu C, Zhang D, Liu H, Cui S. Taurine promotes estrogen synthesis by regulating microRNA-7a2 in mice ovarian granulosa cells. Biochem Biophys Res Commun 2022; 626:129-134. [DOI: 10.1016/j.bbrc.2022.07.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 07/13/2022] [Accepted: 07/21/2022] [Indexed: 11/02/2022]
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