Pressure-induced differentiation of rabbit retinal stem cells into retinal ganglion cells

Authors: Dai Min,  Kang Zefeng,  Hu Zhulin,  Li Yan
DOI: 10.3760/cma.j.cn115989-20200519-00361
Published 2022-12-10
Cite as Chin J Exp Ophthalmol, 2022, 40(12): 1134-1140.

Abstract                              [View PDF] [Read Full Text]

Objective

To investigate the effect of pressure on the differentiation of rabbit retinal stem cells (RSCs) co-cultured with retinal ganglion cells (RGCs).

Methods

SPF grade New Zealand rabbits on the day 22 of gestation were selected, and embryos were removed to obtain retinal ciliary margin pigment epithelial tissue and culture primary RSCs.Six SPF grade newborn New Zealand rabbits were selected, and retinal neuroepithelial layer tissues were isolated to culture primary RGCs.Rabbit RSCs cultured in vitro were identified by immunofluorescence staining of nestin antibody, bromodeoxyuridine (BrdU) cell proliferation assay kit, RSCs spontaneously differentiated cells immunofluorescence detection and flow cytometry.RGCs were identified through immunofluorescence staining of Brn3b antibody and Thy1.1 antibody.A co-culture system of RGCs and RSCs cultured in the upper and lower layers of a transwelll plate respectively was constructed.The mRNA and protein expression levels of nestin and Thy1.1 in RSCs and differentiated cells under pressures of 0, 20, 40, 60, 80 mmHg (1 mmHg=0.133 kPa) were detected by real-time fluorescence quantitative PCR and Western blot.The feeding and use of laboratory animals were in accordance with the Regulations on the Administration of Laboratory Animals promulgated by the State Science and Technology Commission.The study protocol was approved by the Ethics Committee of Yunnan University Affiliated Hospital (No.KPRC-IACUC17008).

Results

RSCs cultured in vitro were nestin-positive.The percentage of BrdU-positive isolated RSCs was (92.26±3.28)%.Some cells differentiated from RSCs were Brn3b-positive, accounting for (13.00±3.06)%, and some were GS-positive, accounting for (31.60±3.67)%.RGCs cultured in vitro were Brn3b- and Thy1.1-positive.There were statistically significant differences in the relative mRNA and protein expressions of nestin and Thy1.1 between RSCs and differentiated cells under different pressures (mRNA: F=127.600, 137.400; both at P<0.01; protein: F=82.480, 158.700; both at P<0.001). The relative mRNA and protein expressions of nestin were significantly reduced in RSCs, and relative mRNA and protein expressions of Thy1.1 were significantly increased in differentiated cells at 20, 40, 60 and 80 mmHg in comparison with 0 mmHg (all at P<0.05). When the pressure was 40 mmHg, the relative mRNA and protein expressions of nestin were lowest in RSCs, and the relative mRNA and protein expressions of Thy1.1 in differentiated cells were highest.

Conclusions

Within a certain range, pressure can promote the differentiation of RSCs co-cultured with RGCs into ganglion-like cells, and excessive pressure can inhibit the differentiation of RSCs.

Key words:

Retina; Stem cells; Retinal ganglion cells; Pressure; Cell differentiation; Glaucoma

Contributor Information

Dai Min

Department of Ophthalmology, Yunnan University Affiliated Hospital, Yunnan Eye Hospital, Yunnan Eye Institute, Key Laboratory of Yunnan Province for the Prevention and Treatment of Ophthalmology, Provincial Innovation Team for Cataract and Ocular Fundus Disease, The Second People’s Hospital of Yunnan Province, Expert Workstation of Yao Ke, Eye Disease Clinical Medical Research Center of Yunnan Province, Eye Disease Clinical Medical Center of Yunnan Province, Kunming 650021, China

Kang Zefeng

Eye Hospital of China Academy of Traditional Chinese Medicine, Beijing 100040, China

Hu Zhulin

Department of Ophthalmology, Yunnan University Affiliated Hospital, Yunnan Eye Hospital, Yunnan Eye Institute, Key Laboratory of Yunnan Province for the Prevention and Treatment of Ophthalmology, Provincial Innovation Team for Cataract and Ocular Fundus Disease, The Second People’s Hospital of Yunnan Province, Expert Workstation of Yao Ke, Eye Disease Clinical Medical Research Center of Yunnan Province, Eye Disease Clinical Medical Center of Yunnan Province, Kunming 650021, China

Li Yan

Department of Ophthalmology, Yunnan University Affiliated Hospital, Yunnan Eye Hospital, Yunnan Eye Institute, Key Laboratory of Yunnan Province for the Prevention and Treatment of Ophthalmology, Provincial Innovation Team for Cataract and Ocular Fundus Disease, The Second People’s Hospital of Yunnan Province, Expert Workstation of Yao Ke, Eye Disease Clinical Medical Research Center of Yunnan Province, Eye Disease Clinical Medical Center of Yunnan Province, Kunming 650021, China

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