FREE RADICAL BIOLOGY AND MEDICINE
·
2024
·
IF 7.1
Dongxiao Meng,Minghui Chang,Xianling Dai,Qin Kuang,Guangchuan Wang
Nonalcoholic steatohepatitis (NASH) is emerging as a major cause of liver transplantation and hepatocellular carcinoma (HCC). Regrettably, its pathological mechanisms are still not fully comprehended. GTP-binding protein 8 (GTPBP8), belonging to the GTP-binding protein superfamily, assumes a crucial role in RNA metabolism, cell proliferation, differentiation, and signal transduction. Its aberrant expression is associated with oxidative stress and mitochondrial dysfunctions. Nevertheless, its specific functions and mechanisms of action, particularly in NASH, remain elusive. In our current study, we initially discovered that human hepatocytes L02 displayed evident mitochondrial respiratory anomaly, mitochondrial damage, and dysfunction upon treatment with palmitic acids and oleic acids (PO), accompanied by significantly reduced GTPBP8 expression levels through RNA-Seq, RT-qPCR, western blotting, and immunofluorescence assays. We then demonstrated that GTPBP8 overexpression mediated by adenovirus vector (Ad-GTPBP8) markedly attenuate lipid accumulation, inflammatory response, and mitochondrial impair and dysfunction in hepatocytes stimulated by PO. Conversely, adenovirus vector-mediated GTPBP8 knockdown (Ad-shGTPBP8) significantly accelerated lipid deposition, inflammation and mitochondrial damage in PO-treated hepatocytes in vitro . Furthermore, we constructed an in vivo NASH murine model by giving a 16-week high fat high cholesterol diet (HFHC) diet to hepatocyte specific GTPBP8-knockout (GTPBP8 HKO ) mice. We firstly found that HFHC feeding led to metabolic disorder in mice, including high body weight, blood glucose and insulin levels, and liver dysfunctions, which were accelerated in these NASH mice with GTPBP8 deficiency in hepatocytes. Consistently, GTPBP8 HKO remarkably exacerbated the progression of NASH phenotypes induced by HFHC, as proved by the anabatic lipid accumulation, inflammation, fibrosis and reactive oxygen species (ROS) production in liver tissues, which could be largely attributed to the severe mitochondrial damage and dysfunction. Mechanistically, we further identified that GTPBP8 interacted with peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) in hepatocytes. Importantly, the hepaprotective effects of GTPBP8 against mitochondrial dysfunction, oxidative stress and inflammation was largely dependent on PGC-1α expression. Collectively, GTPBP8 may exert a protective role in the progression of NASH, and targeting the GTPBP8/PGC-1α axis may represent a potential strategy for NASH treatment by improving mitochondrial functions.
研究领域:
分子生物学
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肝病学
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细胞生物学
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代谢学
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PubMed
高影响因子
Scientific Reports
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2025
·Vol. 15
·期 1
·1-12
·
IF 3.9
Wan Meixia,Li Qing,Xiao Yudie,Zhou Dan,Lei Qianya,Wang Shu
Mori Fructus, rich in polysaccharides and polyphenols, has long been used in East Asia as a functional food and medicinal agent. In traditional Chinese medicine, it is used to treat various ailments like wasting-thirst syndrome and constipation. Studies suggest its extract fractions may alleviate metabolic syndrome symptoms by affecting gut microbiota. To explore this, fecal microbiota transplantation (FMT) was used in an experiment. Pseudo-germ-free mice were created with antibiotics and given a high-fat, high-sugar diet (HFD) to induce metabolic syndrome. Then, fecal bacterial infusions were transplanted. Results showed significant improvement in metabolic syndrome parameters in the FMT-MFPS(fecal microbiota transplantation-Mori Fructus polyphenols plus polysaccharides) group. Dyslipidemia, liver, and kidney injuries were modulated in treated mice. The PPARα/PGC-1α signaling pathway was activated. These findings indicate Mori Fructus extract fractions prevent metabolic syndrome via gut microbiota modulation, with effects sustained through FMT, providing a reference for prevention.
研究领域:
药理学
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营养学
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微生物学
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代谢性疾病
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中医学
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分子生物学
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PubMed
高影响因子
TOXICOLOGY
·
2025
·
IF 4.6
Mei-Ling Le,Jia-Yu Xue,Li-Hai Wu,Xin-Yuan Zhao,Jing Ding,Yang-Yang Yuan,Yi-Qi Wan,Da-Lei Zhang
Hexafluoropropylene oxide (HFPO) homologues (HFPOs), specifically HFPO-dimeric acid (DA), HFPO-trimeric acid (TA) and HFPO-tetrameric acid (TeA), have emerged as industrial replacements for phased-out perfluorooctanoic acid (PFOA), garnering considerable attention due to their environmental ubiquity and bioaccumulation potential. Nevertheless, the reproductive toxicity of HFPOs remains incompletely characterized, particularly regarding their endocrine-disrupting effect and the underlying mechanisms involving Leydig cell dysfunction. In this study, we investigated the cytotoxic influences of HFPOs on TM3 Leydig cells, focusing on mitochondrial function and dynamics, oxidative stress, and apoptosis. Our findings demonstrated that exposure to HFPOs significantly compromised mitochondrial function and fusion-fission dynamics by disrupting the SIRT1/PGC1α signaling pathway. The mitochondrial dysfunction further triggered excessive ROS production and apoptosis, ultimately impairing TM3 Leydig cell viability and testosterone secretion. However, supplementation with the SIRT1 agonist SRT1720 relieved the inhibitory effect of HFPOs on SIRT1/PGC1α signaling pathway and reversed the expression of apoptosis-associated proteins (BAX/BCL2), oxidative stress-associated proteins (SOD1/SOD2), as well as proteins associated with mitochondrial fusion (MFN2/OPA1) and fission (DRP1/FIS1). These results elucidated the involvement of the SIRT1/PGC1α pathway in mediating the cytotoxicity of HFPOs. Notably, the activation of SIRT1 mitigated HFPO-induced toxicity in the TM3 cells, uncovering its potential in safeguarding testicular cells from the damage caused by HFPOs exposure.
研究领域:
毒理学
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环境健康
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内分泌学
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生殖生物学
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分子生物学
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PubMed
高影响因子
Bioactive Materials
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2020
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IF 8.724
Yantao Zheng,Gang Wu,Limei Chen,Ying Zhang,Yuwei Luo,Yong Zheng,Fengjun Hu,Tymor Forouzanfar,Haiyan Lin,Bin Liu
Brain tissues that are severely damaged by traumatic brain injury (TBI) is hardly regenerated, which leads to a cavity or a repair with glial scarring. Stem-cell therapy is one viable option to treat TBI-caused brain tissue damage, whose use is, whereas, limited by the low survival rate and differentiation efficiency of stem cells. To approach this problem, we developed an injectable hydrogel using imidazole groups-modified gelatin methacrylate (GelMA-imid). In addition, polydopamine (PDA) nanoparticles were used as carrier for stromal-cell derived factor-1 (SDF-1α). GelMA-imid hydrogel loaded with [email protected] α nanoparticles and human amniotic mesenchymal stromal cells (hAMSCs) were injected into the damaged area in an in-vivo cryogenic injury model in rats. The hydrogel had low module and its average pore size was 204.61 ± 41.41 nm, which were suitable for the migration, proliferation and differentiation of stem cells. In-vitro cell scratch and differentiation assays showed that the imidazole groups and SDF-1α could promote the migration of hAMSCs to injury site and their differentiation into nerve cells. The highest amount of nissl body was detected in the group of GelMA-imid/SDF-1α/hAMSCs hydrogel in the in-vivo model. Additionally, histological analysis showed that GelMA-imid/SDF-1α/hAMSCs hydrogel could facilitate the regeneration of regenerate endogenous nerve cells. In summary, the GelMA-imid/SDF-1α/hAMSCs hydrogel promoted homing and differentiation of hAMSCs into nerve cells, and showed great application potential for the physiological recovery of TBI.
研究领域:
神经科学
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干细胞疗法
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生物材料
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再生医学
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-11
·
IF 5.479
Wang Qian-Long,Huang Wei-Xue,Zhang Pu-Juan,Chen Li,Lio Chon-Kit,Zhou Hua,Qing Lin-Sen,Luo Pei
An ultra-sensitive method is described here for the determination of HIF-1α (an early biomarker for myocardial infarction) in circulating exosomes in serum. Gold nanospheres were functionalized with a HIF-1α-binding aptamer via sulfydryl chemistry. The apt-AuNP-coated gold seeds were grown by seed-mediated growth, and this significantly increased the peroxidase-mimicking property the nanoparticles. A chromogenic system composed of 3,3′5,5′-tetramethylbenzidine and hydrogen peroxide was used. Absorbance at 652 nm increases linearly in the 0.3 to 200 ng L −1 HIF-1α concentration range, and the limit of detection is 0.2 ng L −1 . The method was tested by analyzing rat serum from isoproterenol (ISO)-induced myocardial infarction. It allows HIF-1α to be directly determined in a 25 μL sample without preconcentration. The assay is not interfered by the polydispersity of exosomes released under either health and disease conditions.
Gold nanospheres were functionalized with a HIF-1α-binding aptamer via sulfydryl chemistry. Nanosized gold seed particles were then modified with the functionalized gold nanospheres, and this strongly increases the peroxidase-mimicking activity of the nanomaterial. By using the tetramethylbenzidine/H 2 O 2 chromogenic system, the absorbance at 652 nm increases linearly in the 0.3 to 200 ng L -1 HIF-1α concentration range.
研究领域:
纳米技术
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生物传感器
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分析化学
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心脏病学
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分子生物学
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DOI
PubMed
高影响因子
Frontiers in Pharmacology
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2021
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IF 5.811
Yin Zhihui,Geng Xinyue,Zhang Zhengyi,Wang Ying,Gao Xiaoyan
Neuronal mitochondrial oxidative stress induced by β-amyloid (Aβ) is an early event of Alzheimer’s disease (AD). Emerging evidence has shown that antioxidant therapy represents a promising therapeutic strategy for the treatment of AD. In this study, we investigated the antioxidant activity of rhein against Aβ1-42 oligomer-induced mitochondrial oxidative stress in primary neurons and proposed a potential antioxidant pathway involved. The results suggested that rhein significantly reduced reactive oxygen species (ROS) level, reversed the depletion of mitochondrial membrane potential, and protected neurons from oxidative stress-associated apoptosis. Moreover, further study indicated that rhein activated mitochondrial biogenesis accompanied by increased cytochrome C oxidase (CytOx) and superoxide dismutase (SOD) activities. CytOx on the respiratory chain inhibited the production of ROS from electron leakage and SOD helped to eliminate excess ROS. Finally, western blot analysis confirmed that rhein remarkedly increased the protein expression of peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) together with its upstream deacetylase sirtuin 1 (SIRT1), and activated downstream transcription factor nuclear respiratory factor 1, promoting mitochondrial biogenesis. In conclusion, our results demonstrate that rhein activates mitochondrial biogenesis regulated by the SIRT1/PGC-1α pathway as an antioxidant defense system against Aβ1-42 oligomer-induced oxidative stress. These findings broaden our knowledge of improving mitochondrial biogenesis as an approach for relieving neuronal oxidative stress in AD.
研究领域:
神经科学
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药理学
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分子生物学
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细胞生物学
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阿尔茨海默病研究
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高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
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2022
·Vol. 20
·期 1
·1-16
·
IF 9.429
Liu Jie,Hu Xiaochun,Feng Lei,Lin Yun,Liang Shujing,Zhu Zhounan,Shi Shuo,Dong Chunyan
Background Non-redundant properties such as hypoxia and acidosis promote tumor metabolic adaptation and limit anti-cancer therapies. The key to the adaptation of tumor cells to hypoxia is the transcriptional and stable expression of hypoxia-inducible factor-1 alpha (HIF-1α). The phosphorylation-activated tumorigenic signal PI3K/AKT/mTOR advances the production of downstream HIF-1α to adapt to tumor hypoxia. Studies have elucidated that acid favors inhibition of mTOR signal. Nonetheless, carbonic anhydrase IX (CAIX), overexpressed on membranes of hypoxia tumor cells with pH-regulatory effects, attenuates intracellular acidity, which is unfavorable for mTOR inhibition. Herein, a drug delivery nanoplatform equipped with dual PI3K/mTOR inhibitor Dactolisib (NVP-BEZ235, BEZ235) and CAIX inhibitor 4‐(2‐aminoethyl) benzene sulfonamide (ABS) was designed to mitigate hypoxic adaptation and improve breast cancer treatment. Results ABS and PEG-NH 2 were successfully modified on the surface of hollow polydopamine (HPDA), while BEZ235 and Chlorin e6 (Ce6) were effectively loaded with the interior of HPDA to form HPDA-ABS/PEG-BEZ235/Ce6 (H-APBC) nanoparticles. The release of BEZ235 from H-APBC in acid microenvironment could mitigate PI3K/mTOR signal and resist HIF-1α-dependent tumor hypoxia adaptation. More importantly, ABS modified on the surface of H-APBC could augment intracellular acids and enhances the mTOR inhibition. The nanoplatform combined with phototherapy inhibited orthotopic breast cancer growth while reducing spontaneous lung metastasis, angiogenesis, based on altering the microenvironment adapted to hypoxia and extracellular acidosis. Conclusion Taken together, compared with free BEZ235 and ABS, the nanoplatform exhibited remarkable anti-tumor efficiency, reduced hypoxia adaptation, mitigated off-tumor toxicity of BEZ235 and solved the limited bioavailability of BEZ235 caused by weak solubility. Graphical Abstract
研究领域:
癌症生物学
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药学
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纳米技术
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分子生物学
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PubMed
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
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2024
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IF 4.8
Jun Liu,Jing Ren,Linlan Zhou,Kaiyue Tan,Donglin Du,Lei Xu,Wenfu Cao,Yudi Zhang
Ethnopharmacological relevance The limitations of modern medicine in mitigating the pathological process of diabetic kidney disease (DKD) necessitate novel, precise, and effective prevention and treatment methods. Huangqi, the root of Astragalus membranaceus Fisch. ex Bunge has been used in traditional Chinese medicine for various kidney ailments. Astragaloside IV (AS-IV), the primary pharmacologically active compound in A. membranaceus , is involved in lipid metabolism regulation; however, its potential in ameliorating renal damage in DKD remains unexplored. Aim of the study To elucidate the specific mechanism by which AS-IV moderates DKD progression. Materials and methods A murine model of DKD and high glucose-induced HK-2 cells were treated with AS-IV. Furthermore, multiomics analysis, molecular docking, and molecular dynamics simulations were performed to elucidate the mechanism of action of AS-IV in DKD, which was validated using molecular biological methods. Results AS-IV regulated glucose and lipid metabolism in DKD, thereby mitigating lipid deposition in the kidneys. Proteomic analysis identified 12 proteins associated with lipid metabolism regulated by AS-IV in the DKD renal tissue. Additionally, lipid metabolomic analysis revealed that AS-IV upregulated and downregulated 4 beneficial and 79 harmful lipid metabolites, respectively. Multiomics analysis further indicated a positive correlation between the top-ranked differential protein heme oxygenase (HMOX)1 and the levels of various harmful lipid metabolites and a negative correlation with the levels of beneficial lipid metabolites. Furthermore, enrichment of both ferroptosis and hypoxia-inducible factor (HIF)-1 signaling pathways during the AS-IV treatment of DKD was observed using proteomic analysis. Validation results showed that AS-IV effectively reduced ferroptosis in DKD-affected renal tubular epithelial cells by inhibiting HIF-1α/HMOX1 pathway activity, upregulating glutathione peroxidase-4 and ferritin heavy chain-1 expression, and downregulating acyl-CoA synthetase long-chain family member-4 and transferrin receptor-1 expression. Our findings demonstrate the potential of AS-IV in mitigating DKD pathology by downregulating the HIF-1α/HMOX1 signaling pathway, thereby averting ferroptosis in renal tubular epithelial cells. Conclusions AS-IV is a promising treatment strategy for DKD via the inhibition of ferroptosis in renal tubular epithelial cells. The findings of this study may help facilitate the development of novel therapeutic strategies.
研究领域:
药理学
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分子生物学
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民族药理学
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肾病学
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代谢组学
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DOI
PubMed
高影响因子
Acta Biomaterialia
·
2022
·
IF 10.633
Yifan Li,Qiangwei Liang,Liyue Zhou,Yongjing Cao,Jiayu Yang,Juan Li,Jinxia Liu,Jiawei Bi,Yanhua Liu
The signaling cascade between nuclear factor-kappa B (NF-κB) and hypoxia-inducible factor-1α (HIF-1α) can be activated by proinflammatory M1 macrophages in rheumatoid arthritis (RA), which produces reactive oxygen species (ROS) and enhances M1 macrophage polarization, thus aggravating the development of RA. Therefore, an ROS-responsive artesunate prodrug micellar nanosystem for co-delivery of dexamethasone (DEX/HA-TK-ART micelles , abbreviated as DEX/HTA) was developed for synergistic inhibition of the HIF-1α/NF-κB cascade to regulate ROS scavenging and macrophage repolarization in RA combination therapy. DEX/HTA micelles displayed prolonged circulation in blood and efficiently co-delivered ART&DEX in the inflamed joints of adjuvant-induced arthritis (AIA) rats; moreover, they were specifically recognized and internalized into M1 macrophages through CD44 receptor-mediated endocytosis . ROS-responsive co-released ART&DEX then exerted a synergistic action to efficiently perform ROS scavenging and repolarization of M1 to M2 macrophages by inhibition of the HIF-1α/NF-κB cascade. The intravenous administration of DEX/HTA micelles into AIA rat models significantly alleviated inflammatory cell infiltration and repaired cartilage injury in the joint. Collectively, our study highlights the therapeutic potential of DEX/HTA micelles for treating RA through synergistic inhibition of the HIF-1α/NF-κB signaling cascade to regulate ROS scavenging and macrophage repolarization. Statement of significance An ROS-responsive artesunate (ART) prodrug micellar nanosystem for co-delivering dexamethasone (DEX), abbreviated as DEX/HA-TK-ART micelle, was developed for synergistic cascade regulation of the HIF-1α/NF-κB pathway on ROS scavenging and macrophage repolarization in combination therapy for rheumatoid arthritis. The well-designed nanosystem showed prolonged circulation in blood and superior ART&DEX accumulation in the inflamed joints of AIA rats; moreover, the micelles were specifically internalized into M1 macrophages and co-released ART&DEX, subsequently leading to inhibition of the HIF-1α/NF-κB pathway for ROS scavenging and macrophage repolarization, thus generating synergistic anti-inflammatory effects in RAW 264.7 cells and AIA rats. The HIF-1α/NF-κB cascade regulation on ROS scavenging and macrophage repolarization based on ART&DEX combination with smart nanotechnology could serve as a promising approach for rheumatoid arthritis therapy.
研究领域:
药理学
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纳米技术
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炎症
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风湿病学
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药物递送系统
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DOI
PubMed
高影响因子
Heliyon
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2024
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IF 3.4
Chongchong Liu,Jiangyan Sun,Xiaoming Shen,Shefang Li,Sha Luo,Na Chen,Yunke Zhang
Epilepsy is a chronic neurological disorder. Drug-resistant epilepsy (DRE) accounts for about one-third of epilepsy patients worldwide. Peimine, a main active component of Fritillaria, has been reported to show anti-inflammatory effects. However, its potential therapeutic role in DRE is not yet fully understood. In this work, a DRE rat model was established by injecting 1 μg kainic acid (KA), followed by a 250 mg/kg administration of valproic acid (VPA) from day 4–31. Rats were treated with different doses of peimine (2.5 mg/kg, 5 mg/kg and 10 mg/kg) daily from day 32–62. In vitro, BV-2 microglia were exposed to different doses of peimine (7.5 μg/ml, 15 μg/ml, and 30 μg/ml) in presence of LPS. The aim of this study was to investigate the potential therapeutic effects of peimine on DRE. The results showed that peimine efficiently suppressed the KA-induced epileptic behaviors of rats in a dose-dependent manner, as recorded by electroencephalography. Furthermore, peimine ameliorated hippocampal neuron injury in DRE rats, and promoted an M1-to-M2 microglial phenotype shift in a dose-dependent manner. Mechanistically, peimine inhibited the TLR4/NF-κB/HIF-1α signaling pathway both in vivo and in vitro. Additionally, peimine suppressed the apoptosis of primary neurons induced by LPS-treated microglia. In conclusion, peimine augments the microglial polarization towards an M2 phenotype by inhibiting the TLR4/NF-κB/HIF-1α signaling pathway, thereby attenuating DRE.
研究领域:
神经病学
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药理学
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免疫学
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细胞生物学
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DOI
PubMed
高影响因子
Molecular Medicine Reports
·
2019
·Vol. 20
·期 4
·3910-3916
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IF 1.851
Zhiwen Zhou,Xiang Ren,Wensheng Zhou,Lijun Zheng
Willed movement facilitates neurological rehabilitation in patients with stroke. Focal ischaemia is the hallmark of patients after stroke, though the detailed molecular mechanism by which willed movement affects neurological rehabilitation after stroke is not fully understood. The aim of the present study was to dissect the key factors of the hypoxia signaling pathway responsible for the willed movement‑improved rehabilitation. Sprague‑Dawley rats undergoing right middle cerebral artery occlusion (MCAO) surgery were randomly divided into four groups: MCAO alone, willed movement (WM), environmental modification (EM) and common rehabilitation (CR). The neurological behaviour score was assessed, and infarction areas were detected by TTC staining. In addition, angiogenesis‑associated genes (vascular epithelial growth factor, angiogenin‑1, matrix metalloproteinases‑2 and ‑9) and hypoxia inducible factor (HIF)‑1α expression was investigated in cells derived from MCAO, WM, EM and CR groups. Finally, the role of HIF‑1α using HIF‑1α knockdown in HUVECs under hypoxic conditions was evaluated. WM significantly improved neurological behaviour and rehabilitation by increasing the behaviour score and by decreasing the infarction area. In addition, CR, EM and WM raised the expression of angiogenesis‑associated genes and HIF‑1α, thereby promoting in vitro tube formation of primary endothelial cells. Knockdown of HIF‑1α in HUVECs restored the increased expression of angiogenesis‑associated genes to normal levels and inhibited in vitro tube formation of HUVECs. Willed movement most effectively improved the neurological rehabilitation of rats with focal ischaemia through upregulation of HIF‑1α. The present findings provide insight into willed movement‑facilitated rehabilitation and may help treat stroke‑triggered motor deficit and improve angiogenesis of cerebral endothelial cells.
研究领域:
神经科学
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康复医学
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分子生物学
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DOI
PubMed
高影响因子
Cell Chemical Biology
·
2025
·
IF 7.2
Huiti Li,Ying Xu,Yimin Zheng,Zian Xue,Qingqing Li,Xinglong Jia,Lietao Weng,Lulu Jiang,Xiaoxue Ruan,Rong Zhang,Yue Yin,Liying Zhou,Fuyuan Li,He Huang,Jin Li,Minjia Tan,Jia Fan,Jiabin Cai,Guoqiang Chen,Lu Zhou
HIF-1α transcriptional activity is enhanced through SUMOylation mediated by CBX4. Despite the recognized importance of the CBX4-HIF-1α axis, the molecular mechanisms governing its regulation remain largely unclear. In this study, phenotypic screening of a 101,254-compound library followed by structural optimization led to the identification of XZA-1 , a small molecule capable of disrupting CBX4-mediated HIF-1α transcriptional activation. Mechanistic investigations revealed that XZA-1 activates HADH, a key enzyme in fatty acid β-oxidation, resulting in increased intracellular levels of acetoacetyl-CoA. This metabolite promotes acetoacetylation of CBX4 at lysine 106, thereby reducing its SUMO E3 ligase activity. In a CBX4-overexpressing xenograft model, XZA-1 demonstrated antitumor effects by enhancing CBX4 K106 acetoacetylation. Additionally, elevated levels of CBX4 K106 acetoacetylation were observed in clinical HCC tissues from patients with better overall survival. These findings suggest that acetoacetyl-CoA functions as a potential antitumor metabolite and establish a novel pharmacological approach for modulating HIF-1α transcriptional activity in cancer.
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高影响因子
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