Relationship between miR-375 regulating Ndrg2/IL-6/STAT3 signaling pathway and diabetic retinopathy in rats.

Abstract:

OBJECTIVE:To explore the relationship between micro ribonucleic acid (miR)-375 in regulating the N-Myc downstream-regulated gene 2 (Ndrg2)/interleukin-6 (IL-6)/signal transducer and activator of transcription 3 (STAT3) signaling pathway and diabetic retinopathy (DR) in rats. MATERIALS AND METHODS:Thirty Sprague- Dawley rats were randomly divided into Control group (n=10), Model group (n=10), and miR-375 inhibitor group [miR-375 small interfering RNA (siRNA) group, n=10]. The rats in Model group were injected with streptozotocin (STZ) via the tail vein to prepare into rat models of diabetes. The body weight, fasting blood glucose, and retinal barrier permeability of rats in each group were detected. The levels of malondialdehyde (MDA) and superoxide dismutase (SOD) in rat serum were measured using kits. Terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick end labeling (TUNEL) assay was performed to determine the apoptosis of optic ganglion cells in rat retinal tissues. Additionally, the messenger RNA (mRNA) and protein levels of Ndrg2, IL-6 and STAT3 in rat retinal tissues were detected via reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting, respectively. RESULTS:Compared with Control group, Model group had reduced body weight of rats, increased blood glucose and retinal permeability of rats, raised serum MDA content, decreased SOD activity, up-regulated apoptotic rate of optic ganglia, and notably elevated mRNA and protein levels of Ndrg2, IL-6 and STAT3 in retinal tissues. Compared with those in Model group, the body weight of rats declined, the blood glucose of rats rose, the retinal permeability of rats was decreased significantly, the serum MDA content was reduced, the SOD activity was raised, the apoptotic rate of optic ganglia was decreased, and the mRNA and protein levels of Ndrg2, IL-6 and STAT3 in retinal tissues were also decreased significantly in miR-375 siRNA group. CONCLUSIONS:MiR-375 inhibitors are able to reduce blood glucose, retinal permeability, and optic ganglion apoptosis in rats with DR, and the mechanism of action may be related to the regulation on the Ndrg2/IL-6/STAT3 signaling pathway.

authors

Pu LJ,Chen W,Liu QH,Huang AP,Zhao Q,Gu HH

doi

10.26355/eurrev_202003_20484

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

2189-2195

issue

5

eissn

1128-3602

issn

2284-0729

journal_volume

24

pub_type

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