Objective To investigate pathological changes in the molecules of human retinal pigment epithelium (hRPE) exposed to an extremely low frequency electromagnetic field (ELF-EMF), and study its possible significance in the occurrence and development of myopia. Methods In this experimental study, the experimental group was composed of hRPE exposed to 50 Hz electromagnetic fields; the untreated group was composed of hRPE without exposure. The changes in hRPE cell morphology were observed and cell proliferation in hRPE was measured by a CCK8 assay. The expressions of matrix metallo-proteinase-2 (MMP-2), tissue inhibitor of metalloproteinase 2 (TIMP-2), transforming growth factor-β2 (TGF-β2) and fibroblast growth factor 2 (FGF-2) mRNA in hRPE were detected by reverse transcription-polymerase chain reaction (RT-PCR). The concentrations of TGF-β2 and FGF-2 in the culture medium of hRPE were assayed by enzyme-linked immunosorbent assay (ELISA). The difference between the two group using independent t test. Results hRPE cell morphology changed, and the proliferation of hRPE was inhibited (t=-7.069,-3.652, -6.974, P<0.05). The mRNA expressions of MMP-2, TIMP-2 and TGF-β2 were up-regulated significantly (t=10.562, 6.277, 4.940, P<0.01). However, the mRNA expression of FGF-2 was down-regulated significantly (t=-6.905, P<0.01). The results of ELISA indicated that after exposure to ELF-EMF, the expression of TGF-β2 in hRPE supernatant medium was up-regulated significantly (t=-4.079, P<0.05). However, the expression of FGF-2 in hRPE supernatant medium was down-regulated (t=4.441, P<0.05). Conclusion ELF-EMF changed the proliferation of hRPE, and also changed the expressions of MMP-2, TIMP-2, TGF-β2 and FGF-2 mRNA in hRPE, which might induce the occurrence of myopia through pathological changes in the molecules of hRPE.
王洁,朱煌,杜尔罡. 极低频电磁场对体外培养人视网膜色素上皮细胞的影响[J]. 中华眼视光学与视觉科学杂志, 2015, 17(7): 424-428.
Wang Jie,Zhu Huang,Du Ergang. Effects of extremely low frequency electromagnetic fields on human retinal pigment epithelium cells. Chinese Journal of Optometry Ophthalmology and Visual science, 2015, 17(7): 424-428. DOI: 10.3760/cma.j.issn.1674-845X.2015.07.010
Wang J, Cui J, Zhu H. Suppression of type I collagen in human scleral fibroblasts treated with extremely low-frequency electromagnetic fields[J]. Mol Vis,2013,19:885-893.
Rohrer B, Stell WK. Basic fibroblast growth factor (bFGF) and transforming growth factor beta (TGF-beta) act as stop and go signals to modulate postnatal ocular growth in the chick[J]. Exp Eye Res,1994,58(5):553-561.
[5]
Barathi VA, Weon SR, Beuerman RW. Expression of muscarinic receptors in human and mouse sclera and their role in the regulation of scleral fibroblasts proliferation[J]. Mol Vis,2009, 15:1277-1293.
[6]
Seko Y, Tanaka Y, Tokoro T. Scleral cell growth is influenced by retinal pigment epithelium in vitro[J]. Graefes Arch Clin Exp Ophthalmol,1994,232(9):545-552.
[7]
Liang YG, Jorgensen AG, Kaestel CG, et al. Bcl-2, Bax, and c-Fos expression correlates to RPE cell apoptosis induced by UV-light and daunorubicin[J]. Curr Eye Res,2000,20(1): 25-34.
Seko Y, Shimokawa H, Tokoro T. Expression of bFGF and TGF-beta 2 in experimental myopia in chicks[J]. Invest Ophthalmol Vis Sci,1995,36(6):1183-1187.
[11]
Lam DS, Lee WS, Leung YF, et al. TGFbeta-induced factor: a candidate gene for high myopia[J]. Invest Ophthalmol Vis Sci,2003,44(3):1012-1015.
[12]
Zhou G, Williams RW. Eye1 and Eye2: gene loci that modulate eye size, lens weight, and retinal area in the mouse[J]. Invest Ophthalmol Vis Sci,1999,40(5):817-825.
[13]
Matrisian LM. Metalloproteinases and their inhibitors in matrix remodeling[J]. Trends Genet,1990,6(4):121-125.
Kijlstra A. Cytokines: their role in uveal disease[J]. Eye (Lond),1997,11(Pt 2):200-205.
[17]
Casson RJ, Wood JP, Melena J, et al. The effect of ischemic preconditioning on light-induced photoreceptor injury[J]. Invest Ophthalmol Vis Sci,2003,44(3):1348-1354.
[18]
Raghavachari N, Fahl WE. Targeted gene delivery to skin cells in vivo: a comparative study of liposomes and polymers as delivery vehicles[J]. J Pharm Sci,2002,91(3):615-622.
[19]
Rohrer B, Stell WK. Basic fibroblast growth factor (bFGF) and transforming growth factor beta (TGF-beta) act as stop and go signals to modulate postnatal ocular growth in the chick[J]. Exp Eye Res,1994,58(5):553-561.