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Mol Neurobiol. 2017 Aug;54(6):4000-4014. doi: 10.1007/s12035-016-9972-5. Epub 2016 Jun 16.

Resveratrol Inhibits Diabetic-Induced Müller Cells Apoptosis through MicroRNA-29b/Specificity Protein 1 Pathway.

Author information

1
Department of Clinical Nutrition, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, 610072, People's Republic of China. zengkaihong2013@hotmail.com.
2
School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, People's Republic of China. zengkaihong2013@hotmail.com.
3
School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, People's Republic of China.
4
Institute of Laboratory Animals, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, 610072, People's Republic of China.
5
Department of Neurology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, 610072, People's Republic of China.
6
School of Food Science, Southwest University, Chongqing, 400715, People's Republic of China.

Abstract

The aim of this study was to evaluate the anti-apoptosis effects of resveratrol (RSV) on diabetic rats retinal Müller cells in vivo and in vitro and to further investigate the roles of microRNA-29b (miR-29b)/specificity protein 1 (SP1) in the anti-apoptosis mechanism of RSV. Retina was obtained from normal and diabetic rats with or without RSV (5 and 10 mg/kg/day) treatments at 1-7 months. TdT-mediated dUTP-biotin nick end labeling (TUNEL) and Annexin V/PI staining were used to detect apoptosis. Immunofluorescence was used to assess distribution of SP1 in retina. MiR-29b and SP1 messenger RNA (mRNA) expression was evaluated by quantitative real-time polymerase chain reaction (qRT-PCR). SP1, Bax, and bcl-2 protein expression was evaluated by western blotting. Caspase-3 activity was detected by assay kit. Our study showed that the TUNEL-positive cells were mainly localized in the inner nuclear layer (INL) of retina and RSV administration effectively suppressed streptozotocin (STZ)-induced apoptosis of retinal cells in INL in vivo (P < 0.001). Our study also showed that RSV administration effectively suppressed high glucose (HG)-induced retinal Müller cells' apoptosis in vitro (P < 0.001). Furthermore, our study revealed that the diabetes-induced downregulated expression of miR-29b and upregulated expression of SP1 could be rescued by RSV in vivo and in vitro (P < 0.05). The anti-apoptosis effect and downregulated SP1 expression effect of RSV was prevented by miR-29b inhibitor (P < 0.05). MiR-29b mimic increased the above-mentioned effects of RSV (P < 0.001). These findings indicate that RSV is a potential therapeutic option for diabetic retinopathy (DR) and that miR-29b/SP1 pathway play roles in the anti-apoptosis mechanism of RSV.

KEYWORDS:

Apoptosis; Diabetic retinopathy; MicroRNA-29b; Müller cells; Resveratrol; Specificity protein 1

PMID:
27311771
DOI:
10.1007/s12035-016-9972-5
[Indexed for MEDLINE]

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