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Zhang X, Zhang Q, Jiang Y, Zhang S, Hong Q, Guo X, Chi X, Tong M. Expression and significance of miR - 20b in retinal photoreceptor cells exposed to PCB 1254. Aging (Albany NY) 2019; 11:8969-8981. [PMID: 31619580 PMCID: PMC6834413 DOI: 10.18632/aging.102360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 10/05/2019] [Indexed: 11/25/2022]
Abstract
Previous studies have shown that PCB1254 has an adverse effect on zebrafish retinal development, but the basic mechanism behind it is not clear. The purpose of this study was to investigate the molecular mechanisms of PCB-induced retinal dysplasia. RT-qPCR, immunoblotting, HE staining and immunofluorescence were adopted to detect the expression at mRNA and protein level. Functional experiments were carried out in 661w cells including CCK-8 assay, caspase-3 assay, and the flow cytometry, while the functional role of miR - 20b was further investigated by using the zebrafish model. The result showed that PCB1254 exposure inhibited cell proliferation and increased the apoptosis of the 661w cells, and the dose–response relationship between the retinal development-related genes (SWS1, CRX, Rho), miR-20b expression and PCB1254 exposure was also discovered. We confirmed that miR-20b targeted FGF2 and GRB2 by constructing a dual luciferase reporter gene and suppressed the cell function as well as PCB1254. In the miR-20b overexpression zebrafish model, we found abnormal retinal morphology characterized by sparse and irregular photoreceptor cells and the thick photoreceptor cell layers. Our results demonstrate for the first time that PCBs target the MAPK/ERK signaling through miR-20b, affecting retinal cell development and leading to visual impairment.
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Affiliation(s)
- Xin Zhang
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Qingyu Zhang
- Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China.,Department of Child Health Care, Northwest Women's and Children's Hospital, Xian 710061, China
| | - Yue Jiang
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Shuchun Zhang
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Qin Hong
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Xirong Guo
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Xia Chi
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Meiling Tong
- Department of Child Health Care, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing 210004, China.,Department of Child Health Care, Nanjing Maternity and Child Health Care Hospital, Nanjing 210004, China.,Department of Pediatrics, Nanjing Medical University, Nanjing 210029, China
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