10.3389/fphar.2018.00478.s001
Yangmei Xie
Yangmei
Xie
Aiqun Chu
Aiqun
Chu
Yonghao Feng
Yonghao
Feng
Long Chen
Long
Chen
Yiye Shao
Yiye
Shao
Qiong Luo
Qiong
Luo
Xiaolin Deng
Xiaolin
Deng
Men Wu
Men
Wu
Xiaohong Shi
Xiaohong
Shi
Yinghui Chen
Yinghui
Chen
Image_1_MicroRNA-146a: A Comprehensive Indicator of Inflammation and Oxidative Stress Status Induced in the Brain of Chronic T2DM Rats.TIF
Frontiers
2018
microRNA-146a
type 2 diabetes mellitus
brain impairment
thymoquinone
inflammation
oxidative stress
biomarker
2018-05-14 07:19:16
Figure
https://frontiersin.figshare.com/articles/figure/Image_1_MicroRNA-146a_A_Comprehensive_Indicator_of_Inflammation_and_Oxidative_Stress_Status_Induced_in_the_Brain_of_Chronic_T2DM_Rats_TIF/6264695
<p>Objective: It was demonstrated that inflammation and oxidative stress induced by hyperglycemia were closely associated with alteration of miR-146a. Here, we investigated the role of miR-146a in mediating inflammation and oxidative stress in the brain of chronic T2DM rats.</p><p>Methods: The chronic T2DM (cT2DM) models were induced by intraperitoneal administration of STZ (35 mg/kg) after being fed a high-fat, high-sugar diet for 6 weeks. H&E staining was conducted to observe the morphological impairment of the rat hippocampus. The expressions of inflammatory mediators (COX-2, TNF-α, IL-1β) and antioxidant proteins (Nrf2, HO-1) were measured by western blot. The levels of MDA and SOD were detected by the respective activity assay kit. The levels of p22phox and miR-146a were examined by quantitative real-time PCR (qRT-PCR). The expressions of IRAK1, TRAF6 and NF-κB p65 were measured by western blot and qRT-PCR. Pearson correlation analysis was performed to investigate the correlations between miR-146a and inflammatory mediators as well as oxidative stress indicators.</p><p>Results: The expression of miR-146a was negatively correlated with inflammation and oxidative stress status. In the brain tissues of cT2DM rats, it was observed that the expressions of inflammatory mediators (COX-2, TNF-α, IL-1β) and oxidative stress indicators including MDA and p22phox were elevated, which were negatively correlated with the expression of miR-146a. While, the antioxidant proteins (Nrf2, HO-1, SOD) levels decreased in the brain of cT2DM rats, which were positively correlated with the miR-146a level. The expressions of NF-κB p65 and its specific modulators (IRAK1&TRAF6) were elevated in the brain of cT2DM rats, which might be inhibited by miR-146a.</p><p>Conclusion: Our results implied that increased inflammation and oxidative stress status were associated with brain impairment in cT2DM rats, which were negatively correlated with miR-146a expression. Thus, miR-146a may serve as a negative comprehensive indicator of inflammation and oxidative stress status in the brain of chronic T2DM rats.</p>