Shuzhi Zhao1, Tao Li1, Jun Li2, Qianyi Lu1, Changjing Han1, Na Wang1, Qinghua Qiu1, Hui Cao1, Xun Xu1, Haibing Chen3, Zhi Zheng4. 1. Department of Ophthalmology, Shanghai First People's Hospital Affiliated to Shanghai Jiao Tong University, Haining Road 100, Shanghai, 200080, People's Republic of China. 2. Department of Ophthalmology, Lishui City Center Hospital, Lishui, People's Republic of China. 3. Department of Endocrinology and Metabolism, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University, Yishan Road 301, Shanghai, 200233, People's Republic of China. chenhb@sjtu.edu.cn. 4. Department of Ophthalmology, Shanghai First People's Hospital Affiliated to Shanghai Jiao Tong University, Haining Road 100, Shanghai, 200080, People's Republic of China. zzheng88@sjtu.edu.cn.
Abstract
AIMS/HYPOTHESIS: The mechanisms underlying the cellular metabolic memory induced by high glucose remain unclear. Here, we sought to determine the effects of microRNAs (miRNAs) on metabolic memory in diabetic retinopathy. METHODS: The miRNA microarray was used to examine human retinal endothelial cells (HRECs) following exposure to normal glucose (N) or high glucose (H) for 1 week or transient H for 2 days followed by N for another 5 days (H→N). Levels of sirtuin 1 (SIRT1) and acetylated-nuclear factor κB (Ac-NF-κB) were examined following transfection with miR-23b-3p inhibitor or with SIRT1 small interfering (si)RNA in the H→N group, and the apoptotic HRECs were determined by flow cytometry. Retinal tissues from diabetic rats were similarly studied following intravitreal injection of miR-23b-3p inhibitor. Chromatin immunoprecipitation (ChIP) analysis was performed to detect binding of NF-κB p65 to the potential binding site of the miR-23b-27b-24-1 gene promoter in HRECs. RESULTS: High glucose increased miR-23b-3p expression, even after the return to normal glucose. Luciferase assays identified SIRT1 as a target mRNA of miR-23b-3p. Reduced miR-23b-3p expression inhibited Ac-NF-κB expression by rescuing SIRT1 expression and also relieved the effect of metabolic memory induced by high glucose in HRECs. The results were confirmed in the retina using a diabetic rat model of metabolic memory. High glucose facilitated the recruitment of NF-κB p65 and promoted transcription of the miR-23b-27b-24-1 gene, which can be suppressed by decreasing miR-23b-3p expression. CONCLUSIONS/ INTERPRETATION: These studies identify a novel mechanism whereby miR-23b-3p regulates high-glucose-induced cellular metabolic memory in diabetic retinopathy through a SIRT1-dependent signalling pathway.
AIMS/HYPOTHESIS: The mechanisms underlying the cellular metabolic memory induced by high glucose remain unclear. Here, we sought to determine the effects of microRNAs (miRNAs) on metabolic memory in diabetic retinopathy. METHODS: The miRNA microarray was used to examine human retinal endothelial cells (HRECs) following exposure to normal glucose (N) or high glucose (H) for 1 week or transient H for 2 days followed by N for another 5 days (H→N). Levels of sirtuin 1 (SIRT1) and acetylated-nuclear factor κB (Ac-NF-κB) were examined following transfection with miR-23b-3p inhibitor or with SIRT1 small interfering (si)RNA in the H→N group, and the apoptotic HRECs were determined by flow cytometry. Retinal tissues from diabeticrats were similarly studied following intravitreal injection of miR-23b-3p inhibitor. Chromatin immunoprecipitation (ChIP) analysis was performed to detect binding of NF-κB p65 to the potential binding site of the miR-23b-27b-24-1 gene promoter in HRECs. RESULTS: High glucose increased miR-23b-3p expression, even after the return to normal glucose. Luciferase assays identified SIRT1 as a target mRNA of miR-23b-3p. Reduced miR-23b-3p expression inhibited Ac-NF-κB expression by rescuing SIRT1 expression and also relieved the effect of metabolic memory induced by high glucose in HRECs. The results were confirmed in the retina using a diabeticrat model of metabolic memory. High glucose facilitated the recruitment of NF-κB p65 and promoted transcription of the miR-23b-27b-24-1 gene, which can be suppressed by decreasing miR-23b-3p expression. CONCLUSIONS/ INTERPRETATION: These studies identify a novel mechanism whereby miR-23b-3p regulates high-glucose-induced cellular metabolic memory in diabetic retinopathy through a SIRT1-dependent signalling pathway.
Authors: Mohammad Shamsul Ola; Mohd Imtiaz Nawaz; M Mairaj Siddiquei; Saleh Al-Amro; Ahmed M Abu El-Asrar Journal: J Diabetes Complications Date: 2012-01-05 Impact factor: 2.852
Authors: Salmaan Ahmed Khan; Aishwarya Sathyanarayan; Mara T Mashek; Kuok Teong Ong; Edith E Wollaston-Hayden; Douglas G Mashek Journal: Diabetes Date: 2015-02 Impact factor: 9.461