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IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL · 2025 · IF 1.7

The active ingredient of Ginkgo biloba extract (quercetin) improved H2O2-induced microglia injury by activating NQO1-PI3K/Akt/mTOR signaling

Sun Jingchi,Zheng Zhousong

Activated microglia are considered to be closely related to brain senescence and the pathogenesis of neurodegenerative diseases. Ginkgo biloba extract (GBE) is widely used to treat cognitive impairment and Alzheimer's disease (AD). This study aims to investigate the active ingredients of GBE and the underlying molecular mechanisms. The active ingredients of GBE in AD treatment were first analyzed by network pharmacology, culminating in the identification of the key ingredient, quercetin, and its targeted protein, NQO1. GO function enriched the oxidative stress pathway, while KEGG enriched the PI3K/Akt/mTOR pathway. Quercetin binding to NQO1 was verified by molecular docking and DARTS analysis. Cytotoxicity assay revealed no significant toxicity of GBE (0–1 mg/mL) and quercetin (0–0.4 μM) over 48 h. Subsequently, we constructed the microglial injury model by H 2 O 2 -induced HMC3 and BV2 cell lines. GBE and quercetin suppressed the senescence characteristics in H 2 O 2 -induced microglia. Further investigation revealed that the expression of NQO1 was downregulated in the injury model, and treatment with GBE and quercetin facilitated the protein expression of NQO1. In addition, silencing NQO1 reduced the promoting effect of quercetin on microglia viability and phosphorylation levels of PI3K, Akt, and mTOR. At the same time, it significantly increased the levels of p53, p21, p16 and β-galactosidase (SA-β-gal). Collectively, GBE mitigated H 2 O 2 -induced microglial injury, which activated the PI3K/Akt/mTOR pathway through the quercetin/NQO1 axis. These findings highlight quercetin/NQO1 signaling as a possible therapeutic target for senescence-related neurodegeneration.

CAS / MDL: 117-39-5 90045-36-6
研究领域: 神经生物学 · 药理学 · 分子医学 · 老年医学 · 神经退行性疾病 · 天然药物化学 · 细胞信号转导
✓ 已验证 产品关联 DOI PubMed 高影响因子
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PHARMACEUTICAL BIOLOGY · 2021 · IF 3.503

Epigallocatechin gallate (EGCG) attenuates myocardial hypertrophy and fibrosis induced by transverse aortic constriction via inhibiting the Akt/mTOR pathway

Yue Cui,Yongqiang Wang,Gang Liu

Context Epigallocatechin gallate (EGCG) is the most abundant catechin from tea. Previous studies have indicated EGCG has a cardioprotective effect.Objective This manuscript mainly explores the role of EGCG in pressure-overload cardiac hypertrophy and its mechanism related to the Akt/mTOR pathway.Methods and methods Transverse aortic constriction (TAC) was utilized to establish the cardiac hypertrophy mice model. C57BL/6 mice were assigned into 6 groups. Starting from the first day after surgery, mice received different doses of EGCG (20, 40, 80 mg/kg) or vehicle orally for four weeks. Heart weight to body weight (HW/BW) ratio and heart weight to tibia length (HW/TL) ratio as well as hematoxylin-eosin staining were utilized to evaluate cardiac hypertrophy. Masson’s trichrome and Sirius red staining were used to depict cardiac fibrosis. The expressions of fibrosis and hypertrophy-related markers and Akt/mTOR pathway were quantified by western blot and qRT-PCR.Results EGCG significantly attenuated cardiac function shown by decreased HW/BW (TAC, 6.82 ± 0.44 vs. 20 mg/kg EGCG, 5.53 ± 0.45; 40 mg/kg EGCG, 4.79 ± 0.32; 80 mg/kg EGCG, 4.81 ± 0.38) and HW/TL (TAC, 11.94 ± 0.69 vs. 20 mg/kg EGCG, 11.44 ± 0.49; 40 mg/kg EGCG, 8.83 ± 0.58; 80 mg/kg EGCG, 8.98 ± 0.63) ratios as well as alleviated cardiac histology. After treatment, hemodynamics was improved, cardiac fibrosis was attenuated. The activated Akt/mTOR pathway was inhibited by EGCG.Discussion and conclusions EGCG plays a protective role in the TAC model by regulating the Akt/mTOR pathway, which provides a theoretical basis for its clinical treatment.

研究领域: 心脏病学 · 药理学 · 分子生物学
✓ 已验证 DOI PubMed 高影响因子
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BIOLOGICAL & PHARMACEUTICAL BULLETIN · 2023 ·Vol. 46 ·期 6 ·764-772 · IF 2

Artesunate Inhibits Apoptosis and Promotes Survival in Schwann Cells via the PI3K/AKT/mTOR Axis in Diabetic Peripheral Neuropathy

Xin Zhang,Zhifang Liang,Ying Zhou,Fang Wang,Shan Wei,Bing Tan,Yujie Guo

Diabetic peripheral neuropathy (DPN) is an early developing complication of diabetes mellitus associated with nerve dysfunction. Artesunate (ART), a natural compound extracted from the herb Artemisia annua L., was reported to benefit neural injury. However, whether ART has a role in preventing DPN is still unknown. In this study, a rat model of DPN with a high fat diet feeding and streptozotocin (STZ) injection was established. The findings indicated that ART treatment significantly ameliorated hyperglycemia-induced hot plate reaction latency (HPRL) decline, cold sensitivity and mechanical allodynia, and nerve injury by inhibiting sciatic nerve apoptosis. Further, ART restored high glucose (HG)-induced elevated apoptosis and deficient survival in rat neuronal Schwann cells, RSC96 cells. We demonstrated that ART promoted protein kinase B (AKT) phosphorylation as well as its downstream factor mammalian target of rapamycin (mTOR) in vivo and in vitro. Of note, the protective effects of ART in RSC96 cells under HG condition could be counteracted by LY294002, a phosphatidylinositol 3-kinase (PI3K) inhibitor. Taken together, ART mitigated hyperglycemia-induced nerve injury by suppressing apoptosis and promoting the viability of Schwann cells via the PI3K/AKT/mTOR signaling pathway.

研究领域: 神经学 · 药理学 · 糖尿病 · 细胞生物学 · 信号传导
✓ 已验证 产品关联 DOI PubMed 高影响因子
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Journal of Functional Foods · 2020 · IF 3.701

Polysaccharide from the seeds of Plantago asiatica L. alleviates nonylphenol induced reproductive system injury of male rats via PI3K/Akt/mTOR pathway

Fenfen Li,Danfei Huang,Weiyu Yang,Xiaozhen Liu,Shaoping Nie,Mingyong Xie

The preventive role of polysaccharide from the seeds of Plantago asiatica L. (PLCP) against reproductive system injury induced by nonylphenol (NP) was investigated. Male Sprague-Dawley rats were exposed orally to NP 1 h after PLCP intragastric administration continuously for 45 days. The results showed that NP induced significant decrease in relative weight of testes and epididymis, changed testicular histomorphology, and disrupted hormone secretions. Moreover, oxidative stress occurred after NP exposure by overproduction of Malondialdehyde, lipid peroxidation, inducible nitric oxide synthase, and low activities of superoxide dismutase and catalase. Furthermore, the induction of apoptosis and disturbance of PI3K/Akt/mTOR pathway by NP were also proved. Interestingly, PLCP alleviated NP toxicity by improving antioxidant enzymes, recovering hormone secretions, inhibiting apoptosis and autophagy, which involves PI3K/Akt/mTOR pathway. These findings provide a good direction that PLCP may be a good candidate to help body defend against toxic substance, particularly endocrine disrupting chemicals induced reproductive toxicity.

CAS / MDL: 84852-15-3
研究领域: 药理学 · 毒理学 · 生殖生物学
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EUROPEAN JOURNAL OF PHARMACOLOGY · 2019 · IF 3.17

Negative regulation of PI3K/AKT/mTOR axis regulates fibroblast proliferation, apoptosis and autophagy play a vital role in triptolide-induced epidural fibrosis reduction

Jihang Dai,Yu Sun,Duoyun Chen,Yaxin Zhang,Lianqi Yan,Xiaolei Li,Jingcheng Wang

Fibroblasts excessive proliferation was considered as a decisive reason for epidural fibrosis , which was known as a serious complication of lumbar laminectomy. As a traditional Chinese medicine , triptolide (TP) was used to be proved effective in preventing several fibrosis scar formation diseases. However, little is known about the effect of TP on preventing epidural fibrosis and its possible mechanism. Here, we performed in vitro and in vivo experiments to detect the possible mechanism of TP in preventing epidural fibrosis. In vitro, the effect of TP on impacting fibroblasts proliferation activities was detected by CCK-8, cell cycle assay and EdU incorporation assay. Also, the expressions of cell proliferation protein markers and the expressions of p-PI3K, p-AKT, p-mTOR were detect by Western blot . Besides, the effect of TP on inducing fibroblast apoptosis and autophagy was tested by Western blots, flow cytometry, TUNEL staining , Transmission electron microscope (TEM) analysis and LC3 immunofluorescent staining. The results suggested that TP could suppress the activation of PI3K/AKT/mTOR signaling pathway. Meanwhile, TP could inhibit fibroblast proliferation and induce fibroblast apoptosis as well as autophagy, which was known as two cellular self-destructions. Furthermore, we speculated the possible molecular pathway, through which that TP could inhibit fibroblast proliferation, induce fibroblast apoptosis and autophagy. We used PI3-kinase activator (740Y-P) to activate the PI3K/AKT/mTOR signaling. Activation of PI3K/AKT/mTOR signaling pathway increase the proliferation of fibroblasts and suppressed the autophagy and apoptosis induced by TP. In vivo, we built epidural fibrosis models in rats and locally applied TP of various concentrations. Hematoxylin–eosin (HE) and Masson's trichrome were used to detect the effect of TP on reducing epidural fibrosis. And the results showed that TP could significantly reduce the surgery-induced epidural fibrosis. In conclusion, the results above shown that TP could reduce epidural fibrosis formation, and the potential mechanism might through inhibiting fibroblast proliferation and stimulating apoptosis and autophagy via suppressing PI3K/AKT/mTOR signaling pathway. It might provide a novel thought for reducing surgery-induced epidural fibrosis.

研究领域: 药理学 · 神经外科 · 细胞生物学
✓ 已验证 DOI PubMed 高影响因子
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INTERNATIONAL IMMUNOPHARMACOLOGY · 2024 · IF 4.8

Tangningtongluo Tablet ameliorates pancreatic damage in diabetic mice by inducing autophagy and inhibiting the PI3K/Akt/mTOR signaling pathway

Ying Ren,Xiangka Hu,Mushuang Qi,Wanjun Zhu,Jin Li,Shuyu Yang,Chunmei Dai

Background Diabetes is a metabolic disease characterized by hyperglycaemia. Tangningtongluo Tablet (TNTL) is an inpatient formula extensively utilized to treat diabetes mellitus (DM), but the protective mechanism is not clear. This study aimed to investigate the relevant mechanisms by which TNTL affects pancreatic damage in diabetic mice and autophagy. Methods The impact of TNTL on pancreatic damage in diabetic mice in vitro and in vivo was investigated via glucose and lipid metabolism analyses, HE staining, CCK-8, TUNEL staining, Annexin V/PI, and Western blotting. Molecular docking and Western blotting were used to verify the results of network pharmacological analysis, which was carried out to explore the mechanism by which TNTL affects DM. The autophagosome levels were visualized via RFP-GFP-LC3 and transmission electron microscopy, and lysosomal function was evaluated via Lysotracker red staining. Western blot, immunohistochemistry and immunofluorescence staining were used to detect the expression of the autophagy proteins LC3, p62 and LAMP2. Results Compared with the model group, TNTL protected pancreas from oxidative stress, decreased the level of MDA, increased the levels of SOD and GSH-px, induced the occurrence of autophagy and decreased the levels of apoptotic factors. Moreover, TNTL inhibited the protein expression of p-PI3K, p-Akt and p-mTOR, increased the levels of LC3 and LAMP2 and decreased the level of p62, and the autophagy inhibitor CQ blocked the protective effect of TNTL on pancreatic damage in diabetic mice. Conclusion These results demonstrated that TNTL ameliorated pancreatic damage in diabetic mice by inhibiting the PI3K/Akt/mTOR signaling and regulating autophagy.

CAS / MDL: 18883-66-4
研究领域: 药理学 · 糖尿病 · 分子生物学 · 细胞生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF ETHNOPHARMACOLOGY · 2021 · IF 4.36

Guizhi Fuling Wan reduces autophagy of granulosa cell in rats with polycystic ovary syndrome via restoring the PI3K/AKT/mTOR signaling pathway

Min Liu,Hongqiu Zhu,Ying Zhu,Xiaodan Hu

Ethnopharmacological relevance Guizhi Fuling Wan (GFW) is a traditional Chinese medicine used to remove blood stasis and dissipate phlegm for treating gynecological diseases that was invented by Zhang Zhongjing in the Eastern Han dynasty. In recent years, GFW has been widely used to treat patients with polycystic ovary syndrome (PCOS). Clinical and animal studies have shown that it is effective in the treatment of PCOS, but its mechanism is unknown. Generally, it works by regulating autophagy via the PI3K/AKT/mTOR signaling pathway. Aim of the study This study investigated the effects and mechanism of GFW in PCOS rats with insulin resistance (IR) in order to provide better understanding of its observed clinical effects and a theoretical basis for the study of traditional Chinese medicine. Materials and methods Eighty-four female Sprague–Dawley rats were randomly divided into seven groups (n = 12 per group): 1) control, 2) PCOS model, 3) low-dose GFW, 4) medium-dose GFW, 5) high-dose GFW, 6) metformin , and 7) medium-dose GFW plus LY294002 . In all non-control groups, we induced PCOS through daily letrozole combined with intragastric high-fat emulsion for 21 days. After treatment, rats were sacrificed and serum follicle-stimulating hormone (FSH), testosterone (T), progesterone , luteinizing hormone (LH), 17β-estradiol, fasting insulin (FINS), and fasting plasma glucose levels were measured by enzyme-linked immunosorbent assay (ELISA). The LH/FSH ratios and HOMA-IR values were calculated. Ovarian morphology was observed by hematoxylin and eosin staining, and all follicles were counted under a microscope. MDC-positive vesicles were used as markers to detect autophagy, and the expression levels of p62, Beclin1 , and LC3-II were examined by immunostaining. Western blotting was used to measure PI3K/AKT/mTOR pathway activation, granulosa cell apoptosis , and autophagy. Results Compared with the PCOS model group, GFW-treated rats had less atretic and cystic follicles, and more mature follicles and corpus lutea. The GFW-treated rats had lower serum T, LH, and FINS levels than the PCOS model group, as well as lower LH/FSH ratios and HOMA-IR values. GFW treatment resulted in significantly reduced levels of cleaved-Caspase-3, cleaved-Caspase-9, BAX, Beclin1, Atg5, and LC3-II. Phosphorylation of PI3K, AKT, and mTOR was significantly higher in GFW-treated rats compared with the PCOS model group. The phosphorylation of PI3K, AKT, and mTOR was decreased with the use of a PI3K antagonist. Conclusions Our results indicate that GFW inhibited granulosa cell autophagy and promoted follicular development to attenuate ovulation disorder in PCOS-IR rats. This was associated with activation of the PI3K/AKT/mTOR signaling pathway.

研究领域: 药理学 · 中医药 · 内分泌学 · 生殖生物学
✓ 已验证 DOI PubMed 高影响因子
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Food & Function · 2020 ·Vol. 11 ·期 5 ·4193-4201 · IF 4.171

tert-Butyl-p-benzoquinone induces autophagy by inhibiting the Akt/mTOR signaling pathway in RAW 264.7 cells

Xianghe Meng,Chaosheng Xia,Qin Ye,Xiaohua Nie

tert-Butyl-p-benzoquinone (TBBQ), a metabolite of tert-butylhydroquinone from food, has cytotoxicity, the underlying mechanism of which is not clear. In this study, the viability of RAW 264.7 cells exposed to TBBQ at concentrations of 0.5–10 μg mL−1 was assayed by MTT. Results suggest that TBBQ decreased the viability in a dose-dependent manner. Monodansylcadaverine (MDC) staining results indicate the occurrence of autophagy induced by TBBQ, which was manifested by activation of LC3-II concurrent with the increased levels of Beclin1 and reduced levels of p62. Elevated lipid peroxide and decreased SOD activity by TBBQ exposure suggest the overproduction of ROS, which may account for the increase in the genotoxic stress protein p53. Both upregulation of p53 and reduction of Akt levels inhibited mTOR, which activated autophagy. Addition of 3-MA counteracted the impact of TBBQ on ATG proteins and cell viability. All of these results suggest that TBBQ induces autophagy of RAW 264.7 cells principally by inhibition of the Akt/mTOR signaling pathway, and they implicate ROS in this regulation.

CAS / MDL: 3602-55-9
研究领域: 药理学 · 细胞生物学 · 毒理学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF BIOMEDICAL SCIENCE · 2023 ·Vol. 30 ·期 1 ·1-19 · IF 11

Tumor-secreted IFI35 promotes proliferation and cytotoxic activity of CD8+ T cells through PI3K/AKT/mTOR signaling pathway in colorectal cancer

Li Peisi,Zhou Dawang,Chen Dongwen,Cheng Yikan,Chen Yuan,Lin Zhensen,Zhang Xi,Huang Zhihong,Cai Jiawei,Huang Wenfeng,Lin Yanyun,Ke Haoxian,Long Jiahui,Zou Yifeng,Ye Shubiao,Lan Ping

Background A large proportion of the patients with cancer do not respond to immunotherapies. Recent studies suggested an important role for tumor-infiltrating cytotoxic T lymphocytes (CTL) in enhancing response to immunotherapy. Here, we aim to identify gene that induce proliferative and cytotoxic states of CD8 + T cells, and to investigate its effect on CAR-T cells against colorectal cancer. Methods Correlation between the expression of IFI35 with the activation and cytotoxicity of CD8 + T cells was assessed with TCGA and proteomic databases. Then we constructed murine colon cancer cells over-expressing IFI35 and tested their effect on anti-tumor immunity in both immunodeficient and immunocompetent mouse models. Flow cytometry and immunohistochemistry were performed to assess the immune microenvironment. Western blot analysis was used to identify the potential down-stream signaling pathway regulated by IFI35. We further investigated the efficacy of the rhIFI35 protein in combination with immunotherapeutic treatment. Results The transcriptional and proteomic analysis of the activation and cytotoxicity of CD8 + T cells in human cancer samples demonstrated that IFI35 expression is correlated with increased CD8 + T cell infiltration and predicted a better outcome in colorectal cancer. The number and cytotoxicity of CD8 + T cells were significantly increased in IFI35-overexpressing tumors. Mechanistically, we identified that the IFNγ-STAT1-IRF7 axis stimulated IFI35 expression, and that IFI35-mediated regulation of CD8 + T cell proliferation and cytotoxicity was dependent on PI3K/AKT/mTOR signaling pathway in vitro. Furthermore, IFI35 protein enhanced the efficacy of CAR-T cells against colorectal cancer cells. Conclusion Our findings identify IFI35 as a new biomarker that can enhance the proliferation and function of CD8 + T cells, as well as increase the efficacy of CAR-T cells against colorectal cancer cells. Graphical Abstract

CAS / MDL: 76-03-9
研究领域: 肿瘤学 · 免疫学 · 分子生物学 · 癌症免疫疗法
✓ 已验证 产品关联 DOI PubMed 高影响因子
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Oxidative Medicine and Cellular Longevity · 2021 · IF 6.543

PIN1 Protects Hair Cells and Auditory HEI-OC1 Cells against Senescence by Inhibiting the PI3K/Akt/mTOR Pathway

Yanzhuo Zhang,Zhe Lv,Yudong Liu,Huan Cao,Jianwang Yang,Baoshan Wang

A growing amount of evidence has confirmed the crucial role of the prolyl isomerase PIN1 in aging and age-related diseases. However, the mechanism of PIN1 in age-related hearing loss (ARHL) remains unclear. Pathologically, ARHL is primarily due to the loss and dysfunction of hair cells (HCs) and spiral ganglion cells (SGCs) in the cochlea. Therefore, in this study, we aimed to investigate the role of PIN1 in protecting hair cells and auditory HEI-OC1 cells from senescence. Enzyme-linked immunosorbent assays, immunohistochemistry, and immunofluorescence were used to detect the PIN1 protein level in the serum of ARHL patients and C57BL/6 mice in different groups, and in the SGCs and HCs of young and aged C57BL/6 mice. In addition, a model of HEI-OC1 cell senescence induced by H2O2 was used. Adult C57BL/6 mice were treated with juglone, or juglone and NAC, for 4 weeks. Interestingly, we found that the PIN1 protein expression decreased in the serum of patients with ARHL, in senescent HEI-OC1 cells, and in the cochlea of aged mice. Moreover, under H2O2 and juglone treatment, a large amount of ROS was produced, and phosphorylation of p53 was induced. Importantly, PIN1 expression was significantly increased by treatment with the p53 inhibitor pifithrin-α. Overexpression of PIN1 reversed the increased level of p-p53 and rescued HEI-OC1 cells from senescence. Furthermore, PIN1 mediated cellular senescence by the PI3K/Akt/mTOR signaling pathway. In vivo data from C57BL/6 mice showed that treatment with juglone led to hearing loss. Taken together, these findings demonstrated that PIN1 may act as a vital modulator in hair cell and HEI-OC1 cell senescence.

CAS / MDL: 616-91-1
研究领域: 衰老 · 听力科学 · 细胞生物学 · 分子生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF FOOD AND DRUG ANALYSIS · 2024 ·Vol. 32 ·期 4 ·506 · IF 2.6

Bitter acids from Humulus lupulus L. alleviate D-galactose induced osteoblastic senescence and bone loss via regulating AKT/mTOR-mediated autophagy

Tian-Shuang Xia,Sheng-Yan Xu,Li-Yong Lai,Yi-Ping Jiang,Na-Ni Wang,Hai-Liang Xin

Bitter acids (BA) are main component of Humulus lupulus L. (hops). They are known for beer brewing and have various biological and pharmacological properties, especially the bone-protective effect confirmed by our previous in vivo study. Here we aimed to elucidate the anti-senior osteoporosis (SOP) effect of BA on osteoblasts and explore its underlying mechanism. In vitro SOP model was established by D-galactose (D-gal) injured osteoblasts, and the bone formation markers and apoptosis level were measured. mCherry-EGFP-LC3 adenovirus infection and autophagic markers including beclin1 and LC3 proteins were detected to investigate the autophagy level in osteoblasts. To further verify whether BA play the bone-protective role through regulating autophagy, the autophagy inhibitor 3-MA was used, and the cell proliferation, ALP activity, bone mineralization, apoptosis rate and SA-β-gal staining areas were measured. Finally, the protein expressions of AKT/mTOR signaling pathway were detected by Western blotting, and AKT agonist SC79 and mTOR agonist MHY1485 were used to further study the mechanism of BA on AKT/mTOR-mediated autophagy. The results showed that BA stimulated osteoblastic differentiation and inhibited apoptosis proteins Bcl-2/Bax in D-gal-treated osteoblasts. BA also increased the expression of autophagic markers beclin1 and LC3-II/LC3-I in D-gal-treated osteoblasts. mCherry-EGFP-LC3 autophagic double fluorescent adenovirus showed BA promoted the generation of autolysosomes and autophagosomes in D-gal-injured osteoblasts, indicating that BA might prevent osteoblastic bone loss through activating autophagy. Autophagy inhibitor 3-MA was used to further verify whether BA played the bone-protective role via regulating autophagy. The results revealed the promotion effects of BA on proliferation, ALP activity, and mineralized nodule formation in D-gal-injured osteoblasts were eliminated after autophagy blocking with 3-MA, and the inhibitory effects of BA on apoptosis rate and SA-β-gal staining areas were also eliminated. Moreover, BA reduced the phosphorylation levels of AKT, mTOR, p70S6K, and 4EBP in AKT/mTOR pathway, and the promotion of BA on the autophagic markers was blocked after the activation of AKT and mTOR by SC79 and MHY1485. In conclusion, it was the first time to demonstrate that BA improved cell activities and bone formation in aging osteoblasts, and revealed the mechanism of BA against SOP in osteoblasts was activating AKT/mTOR-mediated autophagy.

研究领域: 药理学 · 细胞生物学 · 分子生物学 · 老年医学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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Cell Death & Disease · 2021 ·Vol. 12 ·期 1 ·1-18 · IF 8.469

Arsenic trioxide induces macrophage autophagy and atheroprotection by regulating ROS-dependent TFEB nuclear translocation and AKT/mTOR pathway

Fang Shaohong,Wan Xin,Zou Xiaoyi,Sun Song,Hao Xinran,Liang Chenchen,Zhang Zhenming,Zhang Fangni,Sun Bo,Li Hulun,Yu Bo

Inducing autophagy and inhibiting apoptosis may provide a therapeutic treatment for atherosclerosis (AS). For the treatment of progressive AS, arsenic trioxide (ATO) has been used to coat vascular stents. However, the effect of ATO on autophagy of macrophages is still unknown. Therefore, the aims of this study were to characterize the effects and the mechanism of actions of ATO on autophagy in macrophages. Our results showed that ATO-induced activation of autophagy was an earlier event than ATO-induced inhibition of the expression of apoptosis markers in macrophages and foam cells. Nuclear transcription factor EB (TFEB) prevents atherosclerosis by activating macrophage autophagy and promoting lysosomal biogenesis. Here, we report that ATO triggered the nuclear translocation of TFEB, which in turn promoted autophagy and autophagosome-lysosome fusion. Both the latter events were prevented by TFEB knockdown. Moreover, ATO decreased the p-AKT and p-mTOR in the PI3K/AKT/mTOR signaling pathway, thus inducing autophagy. Correspondingly, treatment with the autophagy inhibitor 3-methyladenine (3-MA) abolished the autophagy-inducing effects of ATO. Meanwhile, PI3K inhibitor (LY294002) and mTOR inhibitor (rapamycin) cooperated with ATO to induce autophagy. Furthermore, reactive oxygen species (ROS) were generated in macrophages after treatment with ATO. The ROS scavenger N-acetyl-1-cysteine (NAC) abolished ATO-induced nuclear translocation of TFEB, as well as changes in key molecules of the AKT/mTOR signaling pathway and downstream autophagy. More importantly, ATO promoted autophagy in the aorta of ApoE −/− mice and reduced atherosclerotic lesions in early AS, which were reversed by 3-MA treatment. In summary, our data indicated that ATO promoted ROS induction, which resulted in nuclear translocation of TFEB and inhibition of the PI3K/AKT/mTOR pathway. These actions ultimately promoted macrophage autophagy and reduced atherosclerotic lesions at early stages. These findings may provide a new perspective for the clinical treatment of early-stage atherosclerosis and should be further studied.

CAS / MDL: 54-05-7
研究领域: 心血管疾病 · 药理学 · 细胞生物学 · 分子生物学
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