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Zhang H, Lu S, Xu R, Tang Y, Liu J, Li C, Wei J, Yao R, Zhao X, Wei Q, Ma B. Mechanisms of Estradiol-induced EGF-like Factor Expression and Oocyte Maturation via G Protein-coupled Estrogen Receptor. Endocrinology 2020; 161:5929646. [PMID: 33068422 DOI: 10.1210/endocr/bqaa190] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Indexed: 12/18/2022]
Abstract
Estrogen is an important modulator of reproductive activity through nuclear receptors and G protein-coupled estrogen receptor (GPER). Here, we observed that both estradiol and the GPER-specific agonist G1 rapidly induced cyclic adenosine monophosphate (cAMP) production in cumulus cells, leading to transient stimulation of phosphorylated cAMP response element binding protein (CREB), which was conducive to the transcription of epidermal growth factor (EGF)-like factors, amphiregulin, epiregulin, and betacellulin. Inhibition of GPER by G15 significantly reduced estradiol-induced CREB phosphorylation and EGF-like factor gene expression. Consistently, the silencing of GPER expression in cultured cumulus cells abrogated the estradiol-induced CREB phosphorylation and EGF-like factor transcription. In addition, the increase in EGF-like factor expression in the cumulus cells is associated with EGF receptor (EFGR) tyrosine kinase phosphorylation and extracellular signal-regulated kinase 1/2 (ERK1/2) activation. Furthermore, we demonstrated that GPER-mediated phosphorylation of EGFR and ERK1/2 was involved in reduced gap junction communication, cumulus expansion, increased oocyte mitochondrial activity and first polar body extrusion. Overall, our study identified a novel function for estrogen in regulating EGFR activation via GPER in cumulus cells during oocyte maturation.
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Affiliation(s)
- Hui Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Sihai Lu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Rui Xu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Yaju Tang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Jie Liu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Chan Li
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Juncai Wei
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Ru Yao
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Xiaoe Zhao
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Qiang Wei
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
| | - Baohua Ma
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China
- Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Yangling, Shaanxi, People's Republic of China
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Altun I, Kurutaş EB. G Protein-Coupled Estrogen Receptor Levels After Peripheral Nerve Injury in an Experimental Rat Model. World Neurosurg 2015; 84:1903-6. [PMID: 26325209 DOI: 10.1016/j.wneu.2015.08.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 08/23/2015] [Accepted: 08/24/2015] [Indexed: 12/28/2022]
Abstract
OBJECTIVE To assess whether G protein-coupled estrogen receptor (GPER) levels were altered during crush-induced peripheral nerve injury in an experimental rat model. METHODS Male Wistar rats (N = 80) were allocated to 1 sham and 6 study groups, and crush-type peripheral nerve injury was performed using a clamp on the sciatic nerves of study groups. In the sham group, the sciatic nerve was exposed only, and the wound was closed primarily without any surgical interventions. Peripheral nerve samples were obtained at 1 hour, 6 hours, 12 hours, 24 hours, 3 days, and 7 days. After analysis of nerve tissues by protein analysis and Western blotting, the groups were compared in terms of expression of GPER levels. RESULTS The average levels of GPER in the sham group and study groups at 1 hour, 6 hours, 12 hours, 24 hours, 3 days, and 7 days were 15.06 ng/mL ± 2.91, 3.31 ng/mL ± 0.91, 4.06 ng/mL ± 0.87, 11.94 ng/mL ± 1.15, 10.76 ng/mL ± 1.76, 9.16 ng/mL ± 2.60, and 8.49 ng/mL ± 3.55. All study groups displayed significantly lower levels of GPER compared with the sham group. CONCLUSIONS Our results demonstrate that a basal level of GPER expression occurs in peripheral nerve tissue. The lowest level was detected 1 hour after crush injury, and the highest levels of GPER were detected 12 hours and 24 hours after trauma. Further trials on larger series are required to elucidate the role of GPER in terms of protection and treatment after nerve injury.
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Affiliation(s)
- Idris Altun
- Department of Neurosurgery, Kahramanmaras Sutcu Imam University Medical Faculty, Kahramanmaras, Turkey.
| | - Ergül Belge Kurutaş
- Department of Biochemistry, Kahramanmaras Sutcu Imam University Medical Faculty, Kahramanmaras, Turkey
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