Journal of Advanced Research
·
2024
·
IF 11.4
Jun Ma,Peng Yang,Zhibin Zhou,Tengfei Song,Liang Jia,Xiaofei Ye,Wei Yan,Jiuyi Sun,Tianwen Ye,Lei Zhu
Introduction Osteoarthritis (OA) is the most common arthritis that is characterized by the progressive synovial inflammation and loss of articular cartilage. Although GYY4137 is a novel and slow-releasing hydrogen sulfide (H 2 S) donor with potent anti-inflammatory properties that may modulate the progression of OA, its underlying mechanism remains unclear. Objectives In this study, we validated the protective role of GYY4137 against OA pathological courses and elucidated its underlying regulatory mechanisms. Methods Cell transfection, immunofluorescence staining, EdU assay, transmission electron microscopy, mitochondrial membrane potential measurement, electrophoretic mobility shift assay, sulfhydration assay, qPCR and western blot assays were performed in the primary mouse chondrocytes or the mouse macrophage cell line raw 264.7 for in vitro study. DMM-induced OA mice model and Macrophage-specific p65 knockout (p65 f/f LysM-CreER T2 ) mice on the C57BL/6 background were used for in vivo study. Results We found that GYY4137 can alleviate OA progress by suppressing synovium pyroptosis in vivo. Moreover, our in vitro data revealed that GYY4137 attenuates inflammation-induced NLRP3 and caspase-1 activation and results in a decrease of IL-1β production in macrophages. Mechanistically, GYY4137 increased persulfidation of NF-kB p65 in response to inflammatory stimuli that results in a decrease of cellular reactive oxygen species (ROS) accumulation and ameliorates mitochondrial dysfunctions. Using site-directed mutagenesis, we showed that H 2 S persulfidates cysteine38 in p65 protein and hampers p65 transcriptional activity, and p65 mutant impaired macrophage responses to GYY4137. Conclusion These findings suggest a mechanism by which GYY4137 through redox modification of p65 participates in inhibiting NLRP3 activation by OA to regulate inflammatory responses. Thus, we propose that GYY4137 represents a promising novel therapeutic strategy for the treatment of OA.
研究领域:
风湿病学
·
免疫学
·
药理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2018
·
IF 2.559
Qing Shu,Song Lai,Xiao-Mei Wang,Yun-Long Zhang,Xiao-Lei Yang,Hai-Lian Bi,Hui-Hua Li
Pathological cardiac hypertrophy is the main risk factor for heart diseases. The ubiquitin-proteasome system (UPS) is the major intracellular protein degradation system involved in the development of cardiac hypertrophic remodeling. Ubiquitin-activating enzyme E1, a key component of the UPS, catalyzes the first step in ubiquitin conjugation to mark cellular proteins for degradation via proteasome . However, the functional role of E1 (UBA1) in regulation of hypertrophic remodeling in angiotensin II (Ang II)-infused mice remains unknown. In this study, male wild-type mice were treated with UBA1 inhibitor PYR-41 at two doses of 5 and 10 mg and infused with Ang II (1000 ng/kg/min) for 14 days. Systolic blood pressure was detected by using tail-cuff system. Cardiac function was assessed by echocardiography. Hypertrophic remodeling was analyzed examined by histological examinations. The expressions of genes and proteins were detected by quantitative real-time PCR and immunoblotting analysis. After 14 days, Ang II infusion significantly increased UBA1 expression at both mRNA and protein levels in the hearts. Furthermore, Ang II-infused mice showed a significant increase in systolic blood pressure compensatory cardiac function, hypertrophy, interstitial fibrosis, inflammation and oxidative stress compared with saline-treated controls, whereas these effects were dose-dependently attenuated in PYR-41-treated mice. These beneficial actions were associated mainly with inhibition of PTEN degradation and multiple downstream mediators (AKT, ERK1/2, STAT3 , TGF-β/Smad2/3 and NF-kB(p65)). In conclusion, these results indicate that inhibition of UBA1 suppresses Ang II-induced hypertrophic remodeling, and suggest that administration of low dose PYR-41 may be a new potential therapeutic approach for treating hypertensive heart diseases.
研究领域:
心脏病学
·
药理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYTOMEDICINE
·
2022
·
IF 6.656
Shuang Luo,Jinrong He,Shaowei Huang,Xiaojing Wang,Yulin Su,Yanyang Li,Yanping Chen,Guanghua Yang,Bin Huang,Shaoju Guo,Lian Zhou,Xia Luo
Background Emodin is an active ingredient of traditional Chinese medicine Rheum palmatum L. and Polygonum cuspidatum , which possesses anti-inflammatory and intestinal mucosal protection effects. Our previous study found that emodin significantly alleviated ulcerative colitis induced by sodium dextran sulfate (DSS). In this study, we found the underlying mechanism of emodin on ulcerative colitis (UC). Purpose We aimed to further explore the mechanism of emodin in the treatment of ulcerative colitis from the perspective of metabolism and intestinal flora . Methods Ulcerative colitis was induced by 3% sodium dextran sulfate (DSS) on mice, and the mice were respectively treated with mesalazine , rosiglitazone , emodin, and emodin combined with GW9662 (PPARγ inhibitor) simultaneously. Weight changes , the disease activity index (DAI), colonic length, and pathologic changes in colon were used to evaluate the efficacy of emodin. LC-MS/MS was performed for metabolomics analysis of colon. In addition, intestinal flora was assessed using 16S rDNA sequencing. A vector-based short hairpin RNA (shRNA) method was used to silence PPARγ gene expression in Caco-2 cells. Results Emodin binds to the active site of PPARγ protein and forms hydrogen bond interaction with ARG288 and CYS285 amino acids. Furthermore, Emodin significantly promotes the protein expression of PPARγ, while inhibiting iNOS and NF-kB p65 in UC mice, however, this effect is hardly shown when it is combined with GW9662 (the inhibitor of PPARγ). Meanwhile, emodin suppresses the expression of iNOS in Caco-2 cells induced with IFNγ and IL-22, but has no effect on its expression in shPPARγ-Caco-2 cells. In addition, through activating PPARγ signal pathway , emodin is capable of regulating colonic metabolism including oxidative phosphorylation and citrulline metabolism and effecting luminal availability of oxygen and nitrate. This promotes the recovery of anoxic environment of colon epithelial cells, which strains the growth and expansion of Enterobacteriaceae . Conclusion The mechanism of Emodin in the treatment of ulcerative colitis relies on its regulation of PPARγ signal pathway, which could modulate colonic metabolism and restore intestinal homeostasis .
研究领域:
药理学
·
胃肠病学
·
分子生物学
·
免疫学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhehan Yang,Zhenjia Yang,Xiaoshu Lv,Guangming Jiang,Xiaolong Zhang,Xiaodan Li,Xiaoyu Li,Ruo Yuan,Ying Zhuo
Quantifying trace markers in clinical samples with electrochemical impedance spectroscopy (EIS) biosensors is limited mainly by ubiquitous biofouling because traditional antifouling coatings suffer from low stability and unsatisfactory antifouling capability etc. Herein, a simple and effective strategy was constructed to achieve a highly specific EIS biosensing platform for quantifying protein and DNA in serum by using single-stranded oligonucleotides (ssDNA) as antifouling coating. To achieve the optimized antifouling capability of ssDNA coating, the influence factors of ssDNA structure are investigated by combining electrochemical experiments with theoretical calculations. The results demonstrated that the chemical adsorption of adenine on the Au surface is stronger than that of the other three bases, which endows the poly adenine-ssDNA (polyAn) coating with outstanding antifouling capability. Importantly, we found that the capture ligand structure and ssDNA length remarkably affected the antifouling capability of polyAn because of steric hindrance. As a proof of concept, EIS biosensors based on polyAn antifouling coating were developed to detect target DNA and nuclear factor kappa b p65 (NF-kB p65), respectively, exhibiting outstanding capability of detecting DNA and NF-kB p65 in human serum with low interference and good accuracy. Overall, the presented work may contribute to a deeper understanding of the influence factors of ssDNA-based antifouling coating and holds great insight into the construction of highly specific biosensors for quantifying disease markers in clinical samples.
研究领域:
生物传感器
·
分析化学
·
生物化学
·
分子生物学
·
临床诊断
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）