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Zhang YF, Li XX, Cao XL, Ji CC, Gao XY, Gao D, Han H, Yu F, Zheng MH. MicroRNA-582-5p Contributes to the Maintenance of Neural Stem Cells Through Inhibiting Secretory Protein FAM19A1. Front Cell Neurosci 2022; 16:866020. [PMID: 35685988 PMCID: PMC9171424 DOI: 10.3389/fncel.2022.866020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 05/04/2022] [Indexed: 11/15/2022] Open
Abstract
Epigenetic regulations on the maintenance of neural stem cells (NSCs) are complicated and far from been fully understood. Our previous findings have shown that after blocking Notch signaling in NSCs in vivo, the stemness of NSCs decreases, accompanied by the downregulated expression of miR-582-5p. In the current study, we further investigated the function and mechanism of miR-582-5p in the maintenance of NSCs in vitro and in vivo. After transfecting a mimic of miR-582-5p, the formation of neurospheres and proliferation of NSCs and intermediate progenitor cells (NS/PCs) were enhanced, and the expression of stemness markers such as Sox2, Nestin, and Pax6 also increased. The results were reversed after transfection of an inhibitor of miR-582-5p. We further generated miR-582 knock-out (KO) mice to investigate its function in vivo, and we found that the number of NSCs in the subventricular zone (SVZ) region decreased and the number of neuroblasts increased in miR-582 deficient mice, indicating reduced stemness and enhanced neurogenesis of NSCs. Moreover, RNA-sequencing and molecular biological analysis revealed that miR-582-5p regulates the stemness and proliferation of NSCs by inhibiting secretory protein FAM19A1. In summary, our research uncovered a new epigenetic mechanism that regulates the maintenance of NSCs, therefore providing novel targets to amplify NSCs in vitro and to promote neurogenesis in vivo during brain pathology and aging.
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Affiliation(s)
- Yu-Fei Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, China
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
| | - Xin-Xin Li
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- Xi’ an Key Laboratory of Stem Cell and Regenerative Medicine, Institute of Medical Research, Northwestern Polytechnical University, Xi’an, China
| | - Xiu-Li Cao
- Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi’an, China
| | - Chen-Chen Ji
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
| | - Xiang-Yu Gao
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
| | - Dan Gao
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
| | - Hua Han
- Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, China
- *Correspondence: Hua Han,
| | - Fei Yu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, China
- Fei Yu,
| | - Min-Hua Zheng
- Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi’an, China
- Min-Hua Zheng,
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Yang J, Cui ZN, Dong JN, Lin WB, Jin JT, Tang XJ, Guo XB, Cui SB, Sun M, Ji CC. Early acute fat embolism syndrome caused by femoral fracture: A case report. World J Clin Cases 2021; 9:8260-8267. [PMID: 34621889 PMCID: PMC8462216 DOI: 10.12998/wjcc.v9.i27.8260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/23/2021] [Accepted: 08/05/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Fat embolism syndrome (FES) is a rare complication caused by the presence of fat particles in the microcirculation, which usually occurs within 12-72 h after trauma. At present, there have been few cases of fat embolism presenting within 3 h after trauma. Here, we report a case of femoral fracture complicated with an acute fat embolism caused by a car accident.
CASE SUMMARY A 29-year-old woman with pain, swelling and limited movement of her left lower limb after a car accident was taken by ambulance to our hospital. X-ray examination showed fracture of the middle and lower part of the left femur and fracture of the base of the left fifth metatarsal bone. She was hospitalized and admitted to the orthopedic ward. After the attending doctor performed tibial tubercle bone traction, the patient became confused, followed by respiratory distress. Finally, she was transferred to the intensive care unit. After nearly a month of treatment in the intensive care unit, the patient's cognitive function gradually recovered over 6 mo.
CONCLUSION For patients with early traumatic fractures, young emergency physicians and orthopedics should be aware of the possibility of FES.
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Affiliation(s)
- Jia Yang
- Department of Orthopaedic, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Zhong-Ning Cui
- Department of Orthopaedic, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Jia-Nan Dong
- Department of Gynecology, Gaoping People’s Hospital, Jincheng 048400, Shanxi Province, China
| | - Wen-Bo Lin
- Department of Orthopaedic, Shanghai Changzheng Hospital, Shanghai 200001, China
| | - Jiang-Tao Jin
- Department of Orthopaedic, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Xiao-Jie Tang
- Department of Spinal Surgery, The Yantai Affiliated Hospital of Binzhou Medical University, Yantai 264000, Shandong Province, China
| | - Xiao-Bo Guo
- Department of Orthopaedic, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Shao-Bo Cui
- Department of Critical Care Medicine, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Ming Sun
- Department of Emergency, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
| | - Chen-Chen Ji
- Department of Critical Care Medicine, Jincheng General Hospital, Jincheng 048006, Shanxi Province, China
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Li P, Lu MF, Ji CC, Wu JM, Liu Z, Wang C, Zhang F, Tao R. Convolutional neural network for estimating physical parameters from Newton's rings. Appl Opt 2021; 60:3964-3970. [PMID: 33983335 DOI: 10.1364/ao.422012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 04/11/2021] [Indexed: 06/12/2023]
Abstract
By analyzing Newton's rings, often encountered in interferometry, the parameters of spherical surfaces such as the rings' center and the curvature radius can be estimated. First, the classical convolutional neural networks, visual geometry group (VGG) network and U-Net, are applied to parameter estimation of Newton's rings. After these models are trained, the rings' center and curvature radius can be obtained simultaneously. Compared with previous analysis methods of Newton's rings, it is shown that the proposed method has higher precision, better immunity to noise, and lower time consumption. For a Newton's rings pattern of ${{640}} \times {{480}}$ pixels comprising ${-}{{5}}\;{\rm{dB}}$ Gaussian noise or 60% salt-and-pepper noise, the parameters can be estimated by the VGG model in 0.01 s, the error of the rings' center is less than one pixel, and the error of curvature radius is lower than 0.5%.
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Xu H, Liang T, Wei L, Zhu JC, Liu X, Ji CC, Liu B, Luo ZP. Nano-elastic modulus of tendon measured directly in living mice. J Biomech 2021; 116:110248. [PMID: 33485146 DOI: 10.1016/j.jbiomech.2021.110248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 12/23/2020] [Accepted: 01/03/2021] [Indexed: 01/16/2023]
Abstract
The nano-biomechanical environment of the extracellular matrix is critical for cells to sense and respond to mechanical loading. However, to date, this important characteristic remains poorly understood in living tissue structures. This study reports the experimental measurement of the in vivo nano-elastic modulus of the tendon in a mouse tail model. The experiment was performed on the tail tendon of an 8-week-old C57BL/6 live mouse. Mechanical loading on tail tendons was regulated by changing both voltage and frequency of alternating current stimulation on the erector spinae. The nano-elastic modulus of the tail tendon was measured by atomic force microscope. The nano-elastic modulus showed significant variation (2.19-35.70 MPa) between different locations and up to 39% decrease under muscle contraction, suggesting a complicated biomechanical environment in which cells dwell. In addition, the nano-elastic modulus of the tail tendon measured in live mice was significantly lower than that measured in vitro, suggesting a disagreement of tissue mechanical properties in vivo and in vitro. This information is important for the designs of new extracellular biomaterial that can better mimic the biological environment, and improve clinical outcomes of musculoskeletal tissue degenerations and associated disorders.
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Affiliation(s)
- Hao Xu
- Orthopedic Institute, Medical College, Soochow University, Suzhou, PR China; Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Ting Liang
- Orthopedic Institute, Medical College, Soochow University, Suzhou, PR China; Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Liangyi Wei
- Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Jun-Cheng Zhu
- Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Xuhui Liu
- San Francisco Veterans Affairs Health Care System, and Department of Orthopedic Surgery, University of California at San Francisco, 1700 Owens Street, Room 364, San Francisco, CA 94158, USA
| | - Chen-Chen Ji
- Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Bo Liu
- Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Zong-Ping Luo
- Orthopedic Institute, Medical College, Soochow University, Suzhou, PR China; Orthopaedic Institute, Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, PR China.
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Ji CC, Hu YY, Cheng G, Liang L, Gao B, Ren YP, Liu JT, Cao XL, Zheng MH, Li SZ, Wan F, Han H, Fei Z. A ketogenic diet attenuates proliferation and stemness of glioma stem‑like cells by altering metabolism resulting in increased ROS production. Int J Oncol 2019; 56:606-617. [PMID: 31894296 DOI: 10.3892/ijo.2019.4942] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 10/01/2019] [Indexed: 11/05/2022] Open
Abstract
Abnormal metabolism serves a critical role in the development and progression of different types of malignancies including glioblastoma (GBM), and may therefore serve as a promising target for treatment of cancer. Preclinical studies have indicated that a ketogenic diet (KD) may exhibit beneficial effects in patients with GBM; however, the underlying mechanisms remain incompletely understood. The aim of the present study was to evaluate the effects of a KD on glioma stem‑like cells (GSCs), by culturing patient‑derived primary GSCs as well as a GSC cell line in glucose‑restricted, β‑hydroxybutyrate‑containing medium (BHB‑Glow) which was used to mimic clinical KD treatment. GSCs cultured in BHB‑Glow medium exhibited reduced proliferation and increased apoptosis compared with cells grown in the control medium. Furthermore, decreased expression of stem cell markers, diminished self‑renewal in vitro, and reduced tumorigenic capacity in vivo, providing evidence that the stemness of GSCs was compromised. Mechanistically, culturing in BHB‑Glow medium reduced glucose uptake and inhibited glycolysis in GSCs. Furthermore, culturing in the BHB‑Glow medium resulted in morphological and functional disturbances to the mitochondria of GSCs. These metabolic changes may have reduced ATP production, promoted lactic acid accumulation, and thus, increased the production of reactive oxygen species (ROS) in GSCs. The expression levels and activation of mammalian target of rapamycin, hypoxia‑inducible factor 1 and B‑cell lymphoma 2 were decreased, consistent with the reduced proliferation of GSCs in BHB‑Glow medium. ROS scavenging reversed the inhibitory effects of a KD on GSCs. Taken together, the results demonstrate that treatment with KD inhibited proliferation of GSCs, increased apoptosis and attenuated the stemness in GSCs by increasing ROS production.
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Affiliation(s)
- Chen-Chen Ji
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Yi-Yang Hu
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Guang Cheng
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Liang Liang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Bo Gao
- Department of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Ying-Peng Ren
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Jin-Tao Liu
- Department of Orthopedic Surgery, 413 Hospital, Zhoushan, Zhejiang 316000, P.R. China
| | - Xiu-Li Cao
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Min-Hua Zheng
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - San-Zhong Li
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Feng Wan
- Department of Neurosurgery, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Hua Han
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Zhou Fei
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
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Liu P, Zhou YS, Qin YL, Li L, Liu Y, Xu B, Huang K, Ji CC, Lin F, Wang YG, Li K, Chen SH, Shao LF, Mu JS. [Mechanism of action for oligomeric proanthocyaniclins in pava qnat-induced acute lung injury]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2018; 35:818-822. [PMID: 29316751 DOI: 10.3760/cma.j.issn.1001-9391.2017.11.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: The present study was designed to evaluate the protective effects of oligomeric proanthocyanidins (OPC) in mice exposed to paraquat (PQ) , and to explore the molecular mechanism. Methods: Four experimental groups were designed. CONTROL GROUP 10 BALB/c mice were intraperitoneally injected with normal saline) . PQ group: 10 BALB/c mice were intraperitoneally injected with PQ (100 mg/kg) . PQ+OPC group: 10 BALB/c mice were administered with OPC (100 mg/kg) for 1 h before PQ (100 mg/kg) expo-sure. OPC group: 10 BALB/c mice were intraperitoneally injected with OPC (100 mg/kg) . The peripheral blood samples or lung tissue samples were collected at the designed time points for measuring the levels of oxi-dative stress indicators, the related protein levels of nuclear factor-kappa B (NF-κB) pathway and nuclear fac-tor erythroid related factor-2 (Nrf2) pathway. Results: Compared with the control group, the level of reactive oxygen species (ROS) , the content of malondialdehyde (MDA) in the PQ group were significantly induced, and the activity of superoxide dismutase (SOD) in the PQ group was decreased in the peripheral blood. As com-pared with the PQ group, the level of ROS and the content of MDA in the PQ+OPC group were significantly re-duced, the activity SOD in the PQ+OPC group was increased in the peripheral blood; the level of ROS and the content of MDA were also reduced in lung tissues in the PQ+OPC group. Moreover, compared with the con-trol group, the phosphorylation of IκBα and the expression of NF-κB p65 were increased in lung tissues in the PQ group. The phosphorylation of IκBα and the expression of NF-κB p65 were decreased in lung tissues in the PQ+OPC group as compared with the PQ group. In addition, compared with the control group, the expressions of HO-1 and Nrf2 were increased in lung tissues in OPC group, and these were decreased in lung tissues in PQ groups. Furthermore, the expressions of HO-1 and Nrf2 were also increased in lung tissues in PQ+OPC as com-pared with the PQ group. Conclusion: OPC could alleviate PQ-induced systemic toxicity in mice by regulating oxidative stress via NF-κB and Nrf2 pathway.
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Affiliation(s)
- P Liu
- Department of Emergency, Intensive Care Medicine Center, 302 Hospital of PLA, Beijing 100039, China
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Ji CC, Tang HF, Hu YY, Zhang Y, Zheng MH, Qin HY, Li SZ, Wang XY, Fei Z, Cheng G. Saponin 6 derived from Anemone taipaiensis induces U87 human malignant glioblastoma cell apoptosis via regulation of Fas and Bcl‑2 family proteins. Mol Med Rep 2016; 14:380-6. [PMID: 27175997 DOI: 10.3892/mmr.2016.5287] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 01/07/2016] [Indexed: 11/05/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most common and aggressive type of brain tumor, and is associated with a poor prognosis. Saponin 6, derived from Anemone taipaiensis, exerts potent cytotoxic effects against the human hepatocellular carcinoma HepG2 cell line and the human promyelocytic leukemia HL‑60 cell line; however, the effects of saponin 6 on glioblastoma remain unknown. The present study aimed to evaluate the effects of saponin 6 on human U87 malignant glioblastoma (U87 MG) cells. The current study revealed that saponin 6 induced U87 MG cell death in a dose‑ and time‑dependent manner, with a half maximal inhibitory concentration (IC50) value of 2.83 µM after treatment for 48 h. However, saponin 6 was needed to be used at a lesser potency in HT‑22 cells, with an IC50 value of 6.24 µM. Cell apoptosis was assessed by flow cytometry using Annexin V‑fluorescein isothiocyanate/propidium iodide double staining. DNA fragmentation and alterations in nuclear morphology were examined by terminal deoxynucleotidyl transferase‑mediated dUTP nick end labeling and transmission electron microscopy, respectively. The present study demonstrated that treatment with saponin 6 induced cell apoptosis in U87 MG cells, and resulted in DNA fragmentation and nuclear morphological alterations typical of apoptosis. In addition, flow cytometric analysis revealed that saponin 6 was able to induce cell cycle arrest. The present study also demonstrated that saponin 6‑induced apoptosis of U87 MG cells was attributed to increases in the protein expression levels of Fas, Fas ligand, and cleaved caspase‑3, ‑8 and ‑9, and decreases in the levels of B‑cell lymphoma 2. The current study indicated that saponin 6 may exhibit selective cytotoxicity toward U87 MG cells by activating apoptosis via the extrinsic and intrinsic pathways. Therefore, saponin 6 derived from A. taipaiensis may possess therapeutic potential for the treatment of GBM.
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Affiliation(s)
- Chen-Chen Ji
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Hai-Feng Tang
- Institute of Materia Medica, School of Pharmacy, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Yi-Yang Hu
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Yun Zhang
- Department of Immunology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Min-Hua Zheng
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Hong-Yan Qin
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - San-Zhong Li
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Xiao-Yang Wang
- Department of Pharmacy, The 302nd Hospital of Chinese P.L.A., Beijing 100039, P.R. China
| | - Zhou Fei
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Guang Cheng
- Department of Neurosurgery, Xijing Institute of Clinical Neuroscience, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
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Ji CC, Bao SJ, Lu ZJ, Cai CJ, Yang F, Wei H, Chai H. 3D interpenetrating macroporous graphene aerogels with MnO2 coating for supercapacitors. RUSS J ELECTROCHEM+ 2015. [DOI: 10.1134/s1023193514110056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hu YY, Fu LA, Li SZ, Chen Y, Li JC, Han J, Liang L, Li L, Ji CC, Zheng MH, Han H. Hif-1α and Hif-2α differentially regulate Notch signaling through competitive interaction with the intracellular domain of Notch receptors in glioma stem cells. Cancer Lett 2014; 349:67-76. [PMID: 24705306 DOI: 10.1016/j.canlet.2014.03.035] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2013] [Revised: 03/26/2014] [Accepted: 03/28/2014] [Indexed: 01/16/2023]
Abstract
Hypoxia contributes to GSC expansion principally through Hif-1α and Hif-2α, but how these two factors work together has not been completely understood. We show that hypoxia promoted proliferation, self-renewal and inhibited the conversion of GSCs into INP-like cells through activating Notch signaling. Further data suggested that Hif-2α interacted with NICD and repressed the activity of Notch signaling, in contrast to the role of Hif-1α in Notch signaling. Together, our findings suggest that Hif-1α and Hif-2α competitively bind to NICD and dynamically regulate the activation of Notch signaling in GSCs likely depending on different oxygen tensions, providing improved therapeutic opportunities for malignant gliomas.
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Affiliation(s)
- Yi-Yang Hu
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Luo-An Fu
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - San-Zhong Li
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China; Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Yan Chen
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Jun-Chang Li
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Jun Han
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Liang Liang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Liang Li
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China; Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Chen-Chen Ji
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China; Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China
| | - Min-Hua Zheng
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China.
| | - Hua Han
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Chang-Le Xi Street #17, Xi'an 710032, China.
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Ji CC, Xu MW, Bao SJ, Cai CJ, Lu ZJ, Chai H, Yang F, Wei H. Self-assembly of three-dimensional interconnected graphene-based aerogels and its application in supercapacitors. J Colloid Interface Sci 2013; 407:416-24. [DOI: 10.1016/j.jcis.2013.06.054] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 06/07/2013] [Accepted: 06/17/2013] [Indexed: 11/25/2022]
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Cai CJ, Xu MW, Bao SJ, Ji CC, Lu ZJ, Jia DZ. A green and facile route for constructing flower-shaped TiO2 nanocrystals assembled on graphene oxide sheets for enhanced photocatalytic activity. Nanotechnology 2013; 24:275602. [PMID: 23743520 DOI: 10.1088/0957-4484/24/27/275602] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have demonstrated an environmentally friendly in situ assembly method for the preparation of novel three-dimensional TiO2/graphene oxide (TiO2/GO) nanostructures with favorable flower-shaped architectures. Very little information on such a morphology of TiO2/GO nanostructures is available in the literature. The as-synthesized sample was characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 adsorption-desorption measurements and Raman spectroscopy. Also the TiO2/GO composites exhibited enhanced photocatalytic properties.
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Affiliation(s)
- Chang-Jun Cai
- Key Laboratory of Materials and Technology for Clean Energy, Ministry of Education, Xinjiang University, Urumqi 830046, Xinjiang, People's Republic of China
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Ji CC, Xu MW, Bao SJ, Lu ZJ, Cai CJ, Chai H, Wang RY, Yang F, Wei H. Self-assembled three-dimensional interpenetrating porous graphene aerogels with MnO2 coating and their application as high-performance supercapacitors. NEW J CHEM 2013. [DOI: 10.1039/c3nj00599b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lu ZJ, Bao SJ, Gou YT, Cai CJ, Ji CC, Xu MW, Song J, Wang R. Nitrogen-doped reduced-graphene oxide as an efficient metal-free electrocatalyst for oxygen reduction in fuel cells. RSC Adv 2013. [DOI: 10.1039/c3ra22161j] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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