113 results on '"Sitong Lu"'
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2. An Ultrawide Range, Highly Stretchable Liquid Metal Force and Strain Sensor Based on Spiral Multilayer Microfluidic Fibers.
- Author
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Sitong Lu, Jian Jiao 0003, Xin Li, Haibo Wang, Han Wu, and Qiang Li
- Published
- 2024
- Full Text
- View/download PDF
3. A Majorization Penalty Method for SVM with Sparse Constraint
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Sitong, Lu and Qinana, Li
- Subjects
Mathematics - Optimization and Control - Abstract
Support vector machine is an important and fundamental technique in machine learning. Soft-margin SVM models have stronger generalization performance compared with the hard-margin SVM. Most existing works use the hinge-loss function which can be regarded as an upper bound of the 0-1 loss function. However, it can not explicitly limit the number of misclassified samples. In this paper, we use the idea of soft-margin SVM and propose a new SVM model with a sparse constraint. Our model can strictly limit the number of misclassified samples, expressing the soft-margin constraint as a sparse constraint. By constructing a majorization function, a majorization penalty method can be used to solve the sparse-constrained optimization problem. We apply Conjugate-Gradient (CG) method to solve the resulting subproblem. Extensive numerical results demonstrate the impressive performance of the proposed majorization penalty method., Comment: 25 pages, 1 figures
- Published
- 2021
4. An ultra-flexible curvature sensor without relying on elongation.
- Author
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Sitong Lu, Yun Wang, Jian Jiao 0003, and Haibo Wang
- Published
- 2023
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5. Study on No-load Numerical Simulation of Urban Road Collapse.
- Author
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Sitong Lu, Ruirui Sun, Siping Zeng, Wenyi Gu, and Rui Qiu
- Published
- 2023
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6. Stanniocalcin 1 promotes lung metastasis of breast cancer by enhancing EGFR–ERK–S100A4 signaling
- Author
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Anfei Liu, Yunting Li, Sitong Lu, Chunqing Cai, Fei Zou, and Xiaojing Meng
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Cytology ,QH573-671 - Abstract
Abstract Lung metastasis is the leading cause of breast cancer-related death. The tumor microenvironment contributes to the metastatic colonization of tumor cells in the lungs. Tumor secretory factors are important mediators for the adaptation of cancer cells to foreign microenvironments. Here, we report that tumor-secreted stanniocalcin 1 (STC1) promotes the pulmonary metastasis of breast cancer by enhancing the invasiveness of tumor cells and promoting angiogenesis and lung fibroblast activation in the metastatic microenvironment. The results show that STC1 modifies the metastatic microenvironment through its autocrine action on breast cancer cells. Specifically, STC1 upregulates the expression of S100 calcium-binding protein A4 (S100A4) by facilitating the phosphorylation of EGFR and ERK signaling in breast cancer cells. S100A4 mediates the effect of STC1 on angiogenesis and lung fibroblasts. Importantly, S100A4 knockdown diminishes STC1-induced lung metastasis of breast cancer. Moreover, activated JNK signaling upregulates STC1 expression in breast cancer cells with lung-tropism. Overall, our findings reveal that STC1 plays important role in breast cancer lung metastasis.
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- 2023
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7. Spatial–Temporal Differentiation and Trend Prediction of Coupling Coordination Degree of Port Environmental Efficiency and Urban Economy: A Case Study of the Yangtze River Delta
- Author
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Min Wang, Yu Lan, Huayu Li, Xiaodong Jing, Sitong Lu, and Kexin Deng
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green development ,port environmental efficiency ,urban economy ,coupling coordination degree ,spatial–temporal evolution ,China ,Agriculture - Abstract
Green development is a primary path for ports and cities to achieve a low-carbon transition under the Sustainable Development Goals and a powerful driving force to elevate regional port–city relations to a high level of coordination. In this paper, twenty port cities in the Yangtze River Delta (YRD) were selected and port environmental efficiency (PEE) was calculated through the window SBM model, while the EW-TOPSIS model was used to evaluate high-quality urban economic development (HED). The coupling coordination degree (CCD) model, the kernel density model, GIS spatial analysis, and the grey prediction model were used to further explore the spatial–temporal dynamic evolution and prediction of the CCD between PEE and HED. The results suggested that: (1) PEE fluctuation in the YRD is increasing, with a trend of seaports achieving higher PEE than river ports; (2) HED in the YRD shows upward trends, and the polarization of individual cities is obvious; (3) Temporally, the CCD in the YRD has risen from 0.438 to 0.518. Shanghai consistently maintains intermediate coordination, and Jiangsu has experienced the most significant increase in CCD. Spatially, CCD is led by Lianyungang, Suzhou, Shanghai, and Ningbo-Zhoushan, displaying a decreasing distribution pattern from east to west. The projection for 2026 suggests that all port cities within the YRD will have transitioned to a phase of orderly development. To enhance the coordination level in the YRD, policymakers should consider the YRD as a whole to position the ports functionally and manage them hierarchically, utilize the ports to break down resource boundaries to promote the synergistic division of labor among cities, and then tilt the resources towards Anhui.
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- 2024
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8. Repeated Reserpine Treatment Induces Depressive-like Behaviors Accompanied with Hippocampal Impairment and Synapse Deficit in Mice
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Qian, Xu, Zuodong, Zhong, Sitong, Lu, and Yao, Zhang
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- 2023
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9. Flexible Ankle-Assisted Robot Technology Based on Rope Drive.
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Kefan Xing, Yinghan Wang, Diansheng Chen, Min Wang 0011, and Sitong Lu
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- 2020
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10. Anti-Photoaging Effects of Nanocomposites of Amphiphilic Chitosan/18β-Glycyrrhetinic Acid
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Weiyan Quan, Songzhi Kong, Sidong Li, Qianqian Ouyang, Sitong Lu, Jiaqi Guo, Kefeng Wu, Wei Zhao, and Hui Luo
- Subjects
amphiphilic chitosan ,18β-glycyrrhetinic acid ,nanocrystals ,hydrogel ,skin photoaging ,Organic chemistry ,QD241-441 - Abstract
Improving the transdermal absorption of weakly soluble drugs for topical use can help to prevent and treat skin photoaging. Nanocrystals of 18β-glycyrrhetinic acid (i.e., NGAs) prepared by high-pressure homogenization and amphiphilic chitosan (ACS) were used to form ANGA composites by electrostatic adsorption, and the optimal ratio of NGA to ACS was 10:1. Dynamic light scattering analysis and zeta potential analysis were used to evaluate the nanocomposites’ suspension, and the results showed that mean particle size was 318.8 ± 5.4 nm and the zeta potential was 30.88 ± 1.4 mV after autoclaving (121 °C, 30 min). The results of CCK-8 showed that the half-maximal inhibitory concentration (IC50) of ANGAs (71.9 μg/mL) was higher than that of NGAs (51.6 μg/mL), indicating that the cytotoxicity of ANGAs was weaker than that of NGAs at 24 h. After the composite had been prepared as a hydrogel, the vertical diffusion (Franz) cells were used to investigate skin permeability in vitro, and it was shown that the cumulative permeability of the ANGA hydrogel increased from 56.5 ± 1.4% to 75.3 ± 1.8%. The efficacy of the ANGA hydrogel against skin photoaging was studied by constructing a photoaging animal model under ultraviolet (UV) irradiation and staining. The ANGA hydrogel improved the photoaging characteristics of UV-induced mouse skin significantly, improved structural changes (e.g., breakage and clumping of collagen and elastic fibers in the dermis) significantly, and improved skin elasticity, while it inhibited the abnormal expression of matrix metalloproteinase (MMP)-1 and MMP-3 significantly, thereby reducing the damage caused by UV irradiation to the collagen-fiber structure. These results indicated that the NGAs could enhance the local penetration of GA into the skin and significantly improve the photoaging of mouse skin. The ANGA hydrogel could be used to counteract skin photoaging.
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- 2023
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11. Anion Substitution to Suppress the Voltage Hysteresis of Na3MnTi(PO4)3 as a Cathode Material for Sodium-Ion Batteries.
- Author
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Sitong Lu, Yaxuan Cai, Yanyan Li, Xinyue Du, Juanjuan Wang, Yingying Liu, Kangzhe Cao, and Yang Fan
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- 2024
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12. A Flexible Tactile Sensor Array Based on Conductive Rubber.
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Sitong Lu, Diansheng Chen, Ruidong Hao, and Min Wang 0011
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- 2019
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13. Calcium-sensing stromal interaction molecule 2 upregulates nuclear factor of activated T cells 1 and transforming growth factor-β signaling to promote breast cancer metastasis
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Yutian Miao, Qiang Shen, Siheng Zhang, Hehai Huang, Xiaojing Meng, Xianchong Zheng, Zhuocheng Yao, Zhanxin He, Sitong Lu, Chunqing Cai, and Fei Zou
- Subjects
STIM2 ,Breast cancer ,EMT ,Metastasis ,NFAT1 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background Stromal interaction molecule (STIM) 2 is a key calcium-sensing molecule that regulates the stabilization of calcium ions (Ca2+) and therefore regulates downstream Ca2+-associated signaling and cellular events. We hypothesized that STIM2 regulates epithelial-mesenchymal transition (EMT) to promote breast cancer metastasis. Methods We determined the effects of gain, loss, and rescue of STIM2 on cellular motility, levels of EMT-related proteins, and secretion of transforming growth factor-β (TGF-β). We also conducted bioinformatics analyses and in vivo assessments of breast cancer growth and metastasis using xenograft models. Results We found a significant association between STIM2 overexpression and metastatic breast cancer. STIM2 overexpression activated the nuclear factor of activated T cells 1 (NFAT1) and TGF-β signaling. Knockdown of STIM2 inhibited the motility of breast cancer cells by inhibiting EMT via specific suppression of NFAT1 and inhibited mammary tumor metastasis in mice. In contrast, STIM2 overexpression promoted metastasis. These findings were validated in human tissue arrays of 340 breast cancer samples for STIM2. Conclusion Taken together, our results demonstrated that STIM2 specifically regulates NFAT1, which in turn regulates the expression and secretion of TGF-β1 to promote EMT in vitro and in vivo, leading to metastasis of breast cancer.
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- 2019
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14. A majorization penalty method for SVM with sparse constraint
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Sitong Lu and Qingna Li
- Subjects
Control and Optimization ,Applied Mathematics ,Software - Published
- 2023
15. An Ultrawide Range, Highly Stretchable Liquid Metal Force and Strain Sensor Based on Spiral Multilayer Microfluidic Fibers
- Author
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Sitong Lu, Jian Jiao, Xin Li, Haibo Wang, Han Wu, and Qiang Li
- Subjects
Control and Systems Engineering ,Electrical and Electronic Engineering ,Computer Science Applications ,Information Systems - Published
- 2023
16. Stability analysis of a mobile health care robot.
- Author
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Diansheng Chen, Sitong Lu, Xuanhai Luo, and Min Wang 0011
- Published
- 2016
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17. Chitosan-Based Thermo-Sensitive Hydrogel Loading Oyster Peptides for Hemostasis Application
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Dongying Zhang, Zhang Hu, Lingyu Zhang, Sitong Lu, Fengyan Liang, and Sidong Li
- Subjects
chitosan ,oyster peptides ,hydrogel ,hemostasis ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Uncontrolled massive hemorrhage is one of the principal causes of death in trauma emergencies. By using catechol-modified chitosan (CS-C) as the matrix material and β glycerol phosphate (β-GP) as a thermo-sensitive agent, chitosan-based thermo-sensitive hydrogel loading oyster peptides (CS-C/OP/β-GP) were prepared at physiological temperature. The hemostatic performance of CS-C/OP/β-GP hydrogel was tested in vivo and in vitro, and its biological safety was evaluated. The results showed that the in vitro coagulation time and blood coagulation index of CS-C/OP/β-GP hydrogel were better than those of a commercial gelatin sponge. Notably, compared with the gelatin sponge, CS-C/OP/β-GP hydrogel showed that the platelet adhesion and erythrocyte adsorption rates were 38.98% and 95.87% higher, respectively. Additionally, the hemostasis time in mouse liver injury was shortened by 19.5%, and the mass of blood loss in the mouse tail amputation model was reduced by 18.9%. The safety evaluation results demonstrated that CS-C/OP/β-GP had no cytotoxicity to L929 cells, and the hemolysis rates were less than 5% within 1 mg/mL, suggesting good biocompatibility. In conclusion, our results indicate that CS-C/OP/β-GP is expected to be a promising dressing in the field of medical hemostasis.
- Published
- 2020
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18. Research on the application of ground penetrating radar detection technology in urban road underground space
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Sitong Lu, Min Chen, Jiayu Yuan, and Rui Qiu
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- 2023
19. Research on the Campus Violence in International Schools
- Author
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Sitong Lu
- Published
- 2022
20. Voltage Optimization Method for PV Accessed Distribution Network Based on Local Control
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Qifang Chen, Kaidong Li, Yuan Ma, Mingchao Xia, Minghui Bai, and Sitong Lu
- Published
- 2022
21. Research on Dispersion and Distribution of Trenchless Underground Pipeline Location Based on Classification Statistics and Electromagnetic Method
- Author
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Sitong Lu, Xinrong Mao, Jiayu Yuan, Min Chen, and Tianku Zhao
- Published
- 2022
22. [Establishment of a THP-1 macrophage model infected by recombinant Mycobacterium smegmatis expressing green fluorescent protein]
- Author
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Minying, Li, Chutong, Wang, Meili, Yuan, Sitong, Lu, Zhongqing, Qian, Baiqing, Li, Tao, Xu, and Hongtao, Wang
- Subjects
Macrophages ,Green Fluorescent Proteins ,Mycobacterium smegmatis ,Mycobacterium tuberculosis ,Plasmids - Abstract
Objective To establish a THP-1 macrophage model infected by Mycobacterium smegmatis expressing green fluorescent protein (GFP), to quickly locate and visually detect Mycobacterium smegmatis, and to provide a tracer tool to identify the pathogenesis of tuberculosis and develop new tuberculosis vaccines. Methods The enhanced green fluorescent protein (EGFP) gene sequence was amplified by PCR using pEGFP-N1 plasmid as a template to obtain the coding gene of EGFP, and the amplified product was cloned into the vector pALACE to establish the recombinant plasmid pALACE-EGFP. Electroporation transformed the pALACE-EGFP into Mycobacterium smegmatis, and recombinant Mycobacterium smegmatis clones were screened by hygromycin resistance. After expanded culture, the smears were observed by fluorescence microscopy. The THP-1 macrophages were infected with recombinant Mycobacterium smegmatis, and the expression of EGFP was observed. Results The recombinant plasmid pALACE-EGFP was constructed appropriately. The recombinant Mycobacterium smegmatis was observed under fluorescence microscope. And it was confirmed that EGFP was expressed in recombinant Mycobacterium smegmatis, and THP-1 macrophages emitted green fluorescence after infection. Conclusion The successful establishment of recombinant Mycobacterium smegmatis expressing EGFP protein provides insights for investigating infection and pathogenesis of Mycobacterium tuberculosis.
- Published
- 2022
23. Anti-Photoaging Effects of Nanocomposites of Amphiphilic Chitosan/18β-Glycyrrhetinic Acid
- Author
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Quan weiyan, Songzhi Kong, Sidong Li, Ouyang Qianqian, Sitong Lu, Jiaqi Guo, Kefeng Wu, Wei Zhao, and Hui Luo
- Subjects
amphiphilic chitosan ,18β-glycyrrhetinic acid ,nanocrystals ,hydrogel ,skin photoaging ,Chemistry (miscellaneous) ,Organic Chemistry ,Drug Discovery ,Molecular Medicine ,Pharmaceutical Science ,Physical and Theoretical Chemistry ,Analytical Chemistry - Abstract
Improving the transdermal absorption of weakly soluble drugs for topical use can help to prevent and treat skin photoaging. Nanocrystals of 18β-glycyrrhetinic acid (i.e., NGAs) prepared by high-pressure homogenization and amphiphilic chitosan (ACS) were used to form ANGA composites by electrostatic adsorption, and the optimal ratio of NGA to ACS was 10:1. Dynamic light scattering analysis and zeta potential analysis were used to evaluate the nanocomposites’ suspension, and the results showed that mean particle size was 318.8 ± 5.4 nm and the zeta potential was 30.88 ± 1.4 mV after autoclaving (121 °C, 30 min). The results of CCK-8 showed that the half-maximal inhibitory concentration (IC50) of ANGAs (71.9 μg/mL) was higher than that of NGAs (51.6 μg/mL), indicating that the cytotoxicity of ANGAs was weaker than that of NGAs at 24 h. After the composite had been prepared as a hydrogel, the vertical diffusion (Franz) cells were used to investigate skin permeability in vitro, and it was shown that the cumulative permeability of the ANGA hydrogel increased from 56.5 ± 1.4% to 75.3 ± 1.8%. The efficacy of the ANGA hydrogel against skin photoaging was studied by constructing a photoaging animal model under ultraviolet (UV) irradiation and staining. The ANGA hydrogel improved the photoaging characteristics of UV-induced mouse skin significantly, improved structural changes (e.g., breakage and clumping of collagen and elastic fibers in the dermis) significantly, and improved skin elasticity, while it inhibited the abnormal expression of matrix metalloproteinase (MMP)-1 and MMP-3 significantly, thereby reducing the damage caused by UV irradiation to the collagen-fiber structure. These results indicated that the NGAs could enhance the local penetration of GA into the skin and significantly improve the photoaging of mouse skin. The ANGA hydrogel could be used to counteract skin photoaging.
- Published
- 2023
24. [IL-6 promotes the activation of rat astrocytes and down-regulation of the expression of Kir4.1 channel]
- Author
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Sitong, Lu, Jing, Wang, Tianyi, Sun, Haiqin, Yan, Weiyan, Zou, Huihui, Li, Qi, Qi, and Meiqun, Sun
- Subjects
Rats, Sprague-Dawley ,Interleukin-6 ,Astrocytes ,Animals ,Down-Regulation ,Potassium Channels, Inwardly Rectifying ,Cells, Cultured ,Rats - Abstract
Objective To identify the effects of interleukin-6 (IL-6) on astrocytes activation, and the regulation of the expression of inwardly rectifying potassium 4.1 (Kir4.1) channels in astrocytes. Methods Astrocytes were separated from the cerebral cortex of newborn SD rats, and cultured in the presence of IL-6 or combined with interleukin-6 receptor antagonist (IL-6Ra). CCK-8 assay was performed to measure cell viability. The expression level of Kir4.1 channels in astrocytes was measured using quantitative real-time PCR and Western blot analysis. Results IL-6 promoted the proliferation of astrocytes in a dose- (0-30 ng/mL) and time- (0-24 hours) dependent manner. After astrocytes were treated with IL-6 (30 ng/mL) for 24 hours, the levels of Kir4.1 mRNA and protein decreased significantly, and this down-regulation could be attenuated by IL-6Ra. Conclusion IL-6 promotes the activation of astrocyte and down-regulation of the expression of Kir4.1 channel.
- Published
- 2022
25. Iridoid Glycosides from Phlomis Medicinalis Diels: Optimized Extraction and Hemostasis Evaluation
- Author
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Sitong Lu, Zhaoyu Zhang, Youling Liang, Qingkun Zhong, Guangfa Li, and Zhang Hu
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Hemostasis ,Deep Eutectic Solvents ,Bioengineering ,General Chemistry ,General Medicine ,Biochemistry ,Mice ,Phlomis ,Iridoid Glycosides ,Animals ,Molecular Medicine ,Glycosides ,Molecular Biology ,Chromatography, High Pressure Liquid - Abstract
Phlomis medicinalis Diels, an important perennial herbal plant unique to the Qinghai-Tibet Plateau, is often used as Tibetan Materia Medicine Radix Phlomii for the treatment of cold, cough, and convergence trauma. In order to efficiently extract the iridoid glycosides from P. medicinalis, an ultrasound-assisted deep eutectic solvent extraction technique was employed. The main parameters influencing the extraction process were studied through single-factor tests and the extraction was optimized by using response surface methodology. The hemostasis activity of total iridoid glycosides (TIG) from P. medicinalis was evaluated in vitro and in mice. The optimization results revealed that the optimal process parameters were liquid-solid ratio 20 : 1, choline chloride-lactic acid concentration 79 %, and sonication time 34 min, under which a TIG extraction yield of 20.73 % was obtained. Meanwhile, high-performance liquid chromatography-photodiode array/mass spectrometry (HPLC-PDA/MS) was employed to characterize the optimized extract and indicated that TIG from P. medicinalis mainly consisted of sixteen reported iridoid glycosides with a total content of 91.22 %. The experimental results in vivo and in vitro indicated that TIG from P. medicinalis had strong hemostasis activities, which may be achieved by increasing the fibrinogen levels. Therefore, the ultrasound-assisted deep eutectic solvent extraction is an effective method to extract iridoid glycosides from P. medicinalis and they will be promising candidates to be developed for medical hemostasis agents.
- Published
- 2022
26. Catechol functionalized chitosan/active peptide microsphere hydrogel for skin wound healing
- Author
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Sitong Lu, Zhang Hu, Wei-Yan Quan, Puwang Li, Dong-Ying Zhang, Yu Chen, Sidong Li, and Qianqian Ouyang
- Subjects
Catechols ,02 engineering and technology ,Hemolysis ,Biochemistry ,Cell Line ,Chitosan ,Mice ,03 medical and health sciences ,chemistry.chemical_compound ,Tissue engineering ,Cell Movement ,Structural Biology ,medicine ,Animals ,Molecular Biology ,Skin ,030304 developmental biology ,Wound Healing ,0303 health sciences ,Chemistry ,Granulation tissue ,Hydrogels ,Cell migration ,General Medicine ,021001 nanoscience & nanotechnology ,Ostreidae ,Microspheres ,In vitro ,Anti-Bacterial Agents ,medicine.anatomical_structure ,Glycerophosphates ,Drug delivery ,Self-healing hydrogels ,Peptides ,0210 nano-technology ,Wound healing ,Biomedical engineering - Abstract
Chitosan-based thermosensitive hydrogels have been widely used in drug delivery and tissue engineering, but their poor bioactivity has limited their further applications. Integral active oyster peptide microspheres (OPM) with an average particle diameter of 3.9 μm were prepared with high encapsulation efficiency (72.8%) and loading capacity (11.9%), exhibiting desirable sustained release effects. Using catechol functionalized chitosan (CS-C) as the polymeric matrix, OPM as the filler, and β-sodium glycerophosphate (β-GP) as a thermal sensitizer, the thermosensitive hydrogel CS-C/OPM/β-GP was prepared. Besides, the application of the hydrogel on wound healing was studied, and its biosafety was evaluated. The results of cell migration in vitro showed that the cell migration rate of CS-C/OPM/β-GP reached 97.47 ± 5.41% within 48 h, indicating that the hydrogel accelerated the migration of L929 cells. As demonstrated in the mouse skin wound experiment, CS-C/OPM/β-GP hydrogel not only inhibited the aggregation of diversified inflammatory cells and accelerated the generation of collagen fibers and new blood vessels of the wound, but also enhanced the synthesis of total protein (TP) in granulation tissue, and up-regulated the expression of Ki-67 and VEGF in the injury, thereby achieving fast wound healing. Safety evaluation results showed that CS-C/OPM/β-GP hydrogel was not cytotoxic to L929 cells, and the hemolysis ratio was less than 5% within 1 mg/mL. In conclusion, CS-C/OPM/β-GP hydrogel is expected as a promising medical dressing for wound healing.
- Published
- 2021
27. Sponges of Carboxymethyl Chitosan Grafted with Collagen Peptides for Wound Healing
- Author
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Yu Cheng, Zhang Hu, Yuntao Zhao, Zuhao Zou, Sitong Lu, Bijun Zhang, and Sidong Li
- Subjects
carboxymethyl chitosan ,collagen peptides ,burns ,wound healing ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Burns are physically debilitating and potentially fatal injuries. Two marine biomaterials, carboxymethyl chitosan (CMC) and collagen peptides (COP), have emerged as promising burn dressings. In this paper, sponges of carboxymethyl chitosan grafted with collagen peptide (CMC−COP) were prepared by covalent coupling and freeze drying. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were then used to characterize the prepared sponges. To evaluate the wound healing activity of the CMC−COP sponges, in vitro tests including cell viability scratch wound healing and scald wound healing experiments were performed in rabbits. Appearance studies revealed the porous nature of sponges and FTIR spectroscopy demonstrated the successful incorporation of COP into CMC. The in vitro scratch assay showed that treatment with CMC−COP sponges (at 100 μg/mL) had significant effects on scratch closure. For burn wounds treated with CMC−COP, regeneration of the epidermis and collagen fiber deposition was observed on day 7, with complete healing of the epidermis and wound on days 14 and 21, respectively. Based on the pathological examination by hematoxylin and eosinstaining, the CMC−COP group demonstrated pronounced wound healing efficiencies. These results confirmed that the CMC−COP treatment enhanced cell migration and promoted skin regeneration, thereby highlighting the potential application of these sponges in burn care.
- Published
- 2019
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28. Investigation of the Effects of Molecular Parameters on the Hemostatic Properties of Chitosan
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Zhang Hu, Sitong Lu, Yu Cheng, Songzhi Kong, Sidong Li, Chengpeng Li, and Lei Yang
- Subjects
chitosan ,hemostatic properties ,molecular parameters ,effects ,Organic chemistry ,QD241-441 - Abstract
Hemorrhea is one of the major problems in war, trauma care, and surgical operation that threaten the life of the injured and patients. As a novel polymeric hemostatic agent, biodegradable chitosan can stop bleeding through a variety of approaches. In this paper, chitosan with various molecular parameters was prepared from chitin as raw material through deacetylation, oxidative degradation, hydrophilic modification, and salt formation reactions. The influence of different polymer parameters on the hemostatic effects of chitosan was investigated by in vitro coagulation time and dynamic coagulation assay. The results showed that when the molecular weights were high (105⁻106) and approximate, the coagulation effect of chitosan improved with a decrease of the deacetylation degree and achieved a prominent level in a moderate degree of deacetylation (68.36%). With the same degree of deacetylation, the higher the molecular weight of chitosan, the better the procoagulant effect. The substituent derivatives and acid salts of chitosan showed significant procoagulant effects, especially the acid salts of chitosan. In addition, the hemostasis mechanism of chitosan with various parameters was preliminarily explored by analyzing the plasma recalcification time (PRT). The efforts in this paper laid a basis for further study of the structure⁻activity relationship and the mechanism of chitosan hemostasis.
- Published
- 2018
- Full Text
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29. Optimized preparation of gastric acid-response sulfhydryl functionalized chitosan/alginate/tilapia peptide hydrogel and its protective effects on alcohol-induced liver and brain injury
- Author
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Zhaoyu Zhang, Guangfa Li, Lingyu Zhang, Sitong Lu, Songzhi Kong, and Zhang Hu
- Subjects
Antioxidant ,Ethanol ,General Chemical Engineering ,medicine.medical_treatment ,Alcohol ,General Chemistry ,Pharmacology ,In vitro ,Chitosan ,chemistry.chemical_compound ,chemistry ,In vivo ,medicine ,Gastric acid ,Swelling ,medicine.symptom - Abstract
Long-term alcohol intake or drinking large quantities of alcohol at one time can cause organ damage, which in turn can lead to chronic diseases. It is of important clinical and social significance to find effective approaches for the prevention and treatment of alcohol-induced diseases. In this paper, sulfhydryl functionalized chitosan (chitosan-N-acetyl-L-cysteine, CS-NAC) and sodium alginate (SA) were used as the matrix materials to contain tilapia peptide (TP), and a gastric acid-response hydrogel (CS-NAC/SA/TP) was prepared. Taking the ethanol adsorption rate as the response index, based on the results of the single factor test, the preparation process of CS-NAC/SA/TP was optimized through the Box–Behnken design. The swelling and antioxidant properties of CS-NAC/SA/TP were tested in vitro, and the protective effects on alcohol-induced acute liver injury and chronic brain injury were assessed in vivo. Structural characterization showed that CS-NAC/SA/TP was successfully prepared. Under the optimal conditions (SA concentration of 1%, MCS-NAC/MCaCO3 of 1 : 1, MSA/MCS-NAC(CaCO3) of 15 : 1), the prepared CS-NAC/SA/TP had a porous structure, a swelling ratio of 2350%, an ethanol adsorption rate of 56.23% and strong antioxidant capacities in vitro. Animal experiment results demonstrated that CS-NAC/SA/TP effectively reduced liver and brain injuries in mice caused by alcoholism. Summarily, these findings indicate that CS-NAC/SA/TP has potential applications in preventing alcohol-induced liver and brain injuries.
- Published
- 2021
30. MCU-dependent negative sorting of miR-4488 to extracellular vesicles enhances angiogenesis and promotes breast cancer metastatic colonization
- Author
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Hehai Huang, Xianchong Zheng, Yutian Miao, Zhanxin He, Sitong Lu, Zhuocheng Yao, Fei Zou, and Chunqing Cai
- Subjects
0301 basic medicine ,Cancer Research ,Angiogenesis ,Triple Negative Breast Neoplasms ,Kaplan-Meier Estimate ,Disease-Free Survival ,Metastasis ,Neovascularization ,Extracellular Vesicles ,Mice ,03 medical and health sciences ,0302 clinical medicine ,Nude mouse ,Breast cancer ,Cell Movement ,Cell Line, Tumor ,Human Umbilical Vein Endothelial Cells ,Genetics ,medicine ,Animals ,Humans ,Circulating MicroRNA ,Neoplasm Metastasis ,CX3CL1 ,Molecular Biology ,Regulation of gene expression ,Neovascularization, Pathologic ,biology ,Chemokine CX3CL1 ,Prognosis ,biology.organism_classification ,medicine.disease ,Gene Expression Regulation, Neoplastic ,MicroRNAs ,030104 developmental biology ,Cell culture ,030220 oncology & carcinogenesis ,Cancer research ,Female ,Calcium Channels ,medicine.symptom - Abstract
Based on Stephen Paget's well-established theory, both cell-autonomous and non-cell-autonomous mechanisms are crucial for metastasis. Although the mitochondrial calcium uniporter (MCU) has been suggested to be involved in breast cancer (BC) progression via cell-autonomous mechanisms, whether it assists the metastasis of BC cells through non-cell-autonomous mechanisms remains unclear. This study aimed to demonstrate that the MCU regulates BC metastatic colonization via non-cell-autonomous mechanisms. The results suggested that extracellular vesicles (EVs) derived from MCU-downregulated MDA-MB-231 cells suppressed angiogenesis in the metastatic niche in a nude mouse model, thereby hindering the colonization of BC cells. Mechanistically, we revealed that the MCU negatively correlated with miR-4488 in EVs derived from BC cells. Significantly, miR-4488 was determined to suppress angiogenesis of vascular endothelial cells by directly targeting angiogenic CX3CL1. Furthermore, we identified miR-4488 as being significantly downregulated in serum EVs from patients with triple-negative BC. Hence, this study suggests that MCU-dependent negative sorting of miR-4488 to EVs enhances angiogenesis in the metastatic niche and, thus, favors the metastatic colonization of BC cells.
- Published
- 2020
31. A 3-D finger motion measurement system via soft strain sensors for hand rehabilitation
- Author
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Yongkang Jiang, Min Wang, Che Liu, Diansheng Chen, and Sitong Lu
- Subjects
Flexibility (anatomy) ,Computer science ,Acoustics ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,02 engineering and technology ,Thumb ,Tracking (particle physics) ,Curvature ,01 natural sciences ,Motion capture ,0103 physical sciences ,medicine ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,Instrumentation ,Joint (geology) ,ComputingMethodologies_COMPUTERGRAPHICS ,010302 applied physics ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Soft sensor ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,medicine.anatomical_structure ,0210 nano-technology - Abstract
Finger mobility plays a crucial role in everyday lives and is especially a leading indicator during hand rehabilitation and assistance tasks. In this study, a soft sensor-based three-dimensional (3-D) finger motion measurement system is proposed. Specifically, we report the use of a soft rope-embedded microfluidic sensor with high sensitivity and responsivity for strain sensing in the proposed system. These microfluidic strain sensors are proved to have the advantages of being easy to fabricate, chemically inert, with low hysteresis and good flexibility in their output signals. Besides, kinematic modeling of different finger joints are also provided to investigate the reasonable sensor locations for obtaining accurate measurements. Algorithms to identify the varied non-coplanar motions (abduction/adduction and flexion/extension joint angles) are presented by means of tracking the locations of the first metacarpal bone in multiple thumb postures. As a demonstration of their potential, the rope-embedded strain sensing units were used as curvature sensors mounted on the dorsum of target joints. The soft sensor-based 3-D finger motion measurement system and algorithms are experimentally verified by comparison with a camera-based motion capture device. Placing sensors at the optimal locations, joint angle measurement can reach up
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- 2019
32. [Insulin-like growth factor 1 (IGF-1) promotes phagocytic activity of mouse BV-2 microglial cells via activating PI3K/AKT signaling pathway]
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Liqian, Zhai, Xiaofen, Chen, Sitong, Lu, Dan, Yang, Wanqing, Li, Feidi, Li, Fengjiao, Wu, and Meiqun, Sun
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Mice ,Phosphatidylinositol 3-Kinases ,Animals ,Microglia ,Insulin-Like Growth Factor I ,Phosphorylation ,Proto-Oncogene Proteins c-akt ,Receptor, IGF Type 1 ,Signal Transduction - Abstract
Objective To investigate the effect of insulin-like growth factor 1 (IGF-1) on the phagocytic activity of mouse BV-2 microglial cells. Methods Western blotting was performed to detect the protein levels of IGF-1 and IGF-1 receptor (IGF-1R) in the murine brain after the establishment of acute central nervous system inflammation models by intraperitoneal lipopolysaccharide (LPS) injection (10 mg/kg). The protein level of IGF-1R on BV-2 microglial cells that had been stimulated by 500 ng/mL LPS for 4, 12 and 24 hours was measured by Western blotting. To assess the phagocytic activity of microglial cells in response to IGF-1, BV-2 microglial cells were stimulated by IGF-1 at different concentrations for 24 hours after pretreated with or without wortmannin (PI3K/AKT signaling pathway blocker), and then incubated with fluorescent microbeads for 2 hours followed by measurement of phagocytosis of the fluorescent microbeads by flow cytometry. After treatment of IGF-1 (50 ng/mL), p-AKT and AKT signaling pathways in the BV-2 microglial cells were detected by Western blotting. Results Intraperitoneal LPS injection caused increased levels of IGF-1 and IGF-1R in the mouse brain. LPS upregulated the protein expression of IGF-1R on BV-2 microglial cells. The activity of BV-2 microglial cells to phagocytose fluorescent microbeads gradually increased with IGF-1 concentration rising and peaked in the IGF-1 treatment at 50 ng/mL, and gradually decreased thereafter. And IGF-1 induced the phosphorylation of AKT in BV-2 microglial cells. However, after the PI3K/AKT signaling pathway was blocked via wortmannin, the effect of IGF-1 on the activity of BV-2 microglial cells to phagocytose fluorescent microbeads was significantly alleviated. Conclusion IGF-1 can promote phagocytic activity of BV-2 cells via activating PI3K/AKT signaling pathway, which suggests a potential role of IGF-1 in regulating the cerebral inflammation.
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- 2021
33. Use of 18β-glycyrrhetinic acid nanocrystals to enhance anti-inflammatory activity by improving topical delivery
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Sitong Lu, Yongmei Huang, Sidong Li, Jinlong Tao, Wei-Yan Quan, Qianqian Ouyang, Hui Luo, and Songzhi Kong
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Dispersity ,Anti-Inflammatory Agents ,02 engineering and technology ,01 natural sciences ,Mice ,Colloid and Surface Chemistry ,Dynamic light scattering ,In vivo ,0103 physical sciences ,Nano ,Animals ,Physical and Theoretical Chemistry ,Solubility ,010304 chemical physics ,Chemistry ,Surfaces and Interfaces ,General Medicine ,021001 nanoscience & nanotechnology ,Bioavailability ,Permeability (electromagnetism) ,Glycyrrhetinic Acid ,Nanoparticles ,Particle size ,0210 nano-technology ,Biotechnology ,Nuclear chemistry - Abstract
18β-Glycyrrhetinic acid (GA) is often topically applied in clinical treatment of inflammatory skin diseases. However, GA has poor solubility in water, which results in poor skin permeability and low bioavailability. Nanocrystallization of drugs can enhance their permeability and improve bioavailability. We prepared GA nanocrystals (Nano GA) by high-pressure homogenization. These nanocrystals were characterized by photon correlation spectroscopy, scanning electron microscopy, thermogravimetric analysis, and X-ray diffractometry. The ability of Nano GA to improve dermal permeability was investigated ex vivo using Franz diffusion vertical cells and mouse skin. The topical anti-inflammatory activity of Nano GA was assessed in vivo by a 12-O-tetradecanoyl phorbol-13-acetate (TPA)-induced model in mouse ears. The average particle size of a GA nanocrystalline suspension was 288.6 ± 7.3 nm, with a narrow particle-size distribution (polydispersity index ∼0.13 ± 0.10), and the particle size of the lyophilized powder increased (552.0 ± 9.8 nm). After nanocrystallization, the thermal stability and crystallinity decreased but solubility increased significantly. Nano GA showed higher dermal permeability than Coarse GA. Macroscopic and staining-based observations of mouse ears and the levels of proinflammatory factors and myeloperoxidase revealed that the Nano GA hydrogel exhibited better anti-edema ability and more strongly inhibited inflammation development than the Coarse GA hydrogel and indomethacin hydrogel (positive drug). These results suggest that Nano GA could be an efficacious topical therapeutic agent for skin inflammation.
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- 2021
34. Chitosan-Based Thermo-Sensitive Hydrogel Loading Oyster Peptides for Hemostasis Application
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Dong-Ying Zhang, Zhang Hu, Sidong Li, Lingyu Zhang, Sitong Lu, and Fengyan Liang
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Biocompatibility ,02 engineering and technology ,oyster peptides ,lcsh:Technology ,01 natural sciences ,Article ,Chitosan ,chemistry.chemical_compound ,In vivo ,medicine ,General Materials Science ,lcsh:Microscopy ,Cytotoxicity ,lcsh:QC120-168.85 ,Liver injury ,Chromatography ,lcsh:QH201-278.5 ,lcsh:T ,010405 organic chemistry ,021001 nanoscience & nanotechnology ,medicine.disease ,Hemolysis ,In vitro ,0104 chemical sciences ,chemistry ,lcsh:TA1-2040 ,Hemostasis ,hemostasis ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,chitosan ,hydrogel ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,lcsh:TK1-9971 - Abstract
Uncontrolled massive hemorrhage is one of the principal causes of death in trauma emergencies. By using catechol-modified chitosan (CS-C) as the matrix material and &beta, glycerol phosphate (&beta, GP) as a thermo-sensitive agent, chitosan-based thermo-sensitive hydrogel loading oyster peptides (CS-C/OP/&beta, GP) were prepared at physiological temperature. The hemostatic performance of CS-C/OP/&beta, GP hydrogel was tested in vivo and in vitro, and its biological safety was evaluated. The results showed that the in vitro coagulation time and blood coagulation index of CS-C/OP/&beta, GP hydrogel were better than those of a commercial gelatin sponge. Notably, compared with the gelatin sponge, CS-C/OP/&beta, GP hydrogel showed that the platelet adhesion and erythrocyte adsorption rates were 38.98% and 95.87% higher, respectively. Additionally, the hemostasis time in mouse liver injury was shortened by 19.5%, and the mass of blood loss in the mouse tail amputation model was reduced by 18.9%. The safety evaluation results demonstrated that CS-C/OP/&beta, GP had no cytotoxicity to L929 cells, and the hemolysis rates were less than 5% within 1 mg/mL, suggesting good biocompatibility. In conclusion, our results indicate that CS-C/OP/&beta, GP is expected to be a promising dressing in the field of medical hemostasis.
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- 2020
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35. Gastric acid-response chitosan/alginate/tilapia collagen peptide composite hydrogel: Protection effects on alcohol-induced gastric mucosal injury
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Wang Ye, Songzhi Kong, Lingyu Zhang, Sitong Lu, Liao Mingneng, and Zhang Hu
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Polymers and Plastics ,Alginates ,Mice, Inbred Strains ,Inflammation ,Pharmacology ,Protective Agents ,medicine.disease_cause ,Gastric Acid ,Chitosan ,Mice ,chemistry.chemical_compound ,Materials Chemistry ,medicine ,Gastric mucosa ,Animals ,Ethanol metabolism ,Organic Chemistry ,Hydrogels ,Glutathione ,medicine.anatomical_structure ,chemistry ,Gastric Mucosa ,Alcohols ,Gastric acid ,Collagen ,medicine.symptom ,Gastritis ,Peptides ,Oxidative stress ,Tilapia - Abstract
Long-term excessive alcohol intake can easily lead to gastritis, gastric ulcer, and gastric bleeding. In this paper, the gastric acid-responsive hydrogel of CS-NAC/alginate/tilapia collagen peptide (CS-NAC/ALG/TCP) was developed. Its structure and properties were determined. The alcohol-induced gastric mucosal injury models in mice were established to evaluate the protective effects of CS-NAC/ALG/TCP. The results showed that CS-NAC/ALG/TCP was successfully fabricated, and it showed a sustained release of TCP, strong mucoadhesion, and excellent biodegradability in vitro. In the animal experiments, CS-NAC/ALG/TCP improved the oxidative stress status of the gastric mucosa by increasing the levels of SOD, GSH, and CAT in tissues. It also down-regulated the expression of MPO, TNF-α, IL-1β, and IL-6, and increased the production of gastric protective factors such as PGE2 and NO in mouse stomach, thereby reducing the alcohol-induced inflammation and protecting the gastric mucosal injury. Besides, CS-NAC/ALG/TCP can also increase the activities of alcohol metabolism enzymes to improve alcohol metabolism, thereby reducing alcoholic damage. In conclusion, CS-NAC/ALG/TCP is a promising candidate for the treatment of alcohol-induced gastric injury.
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- 2022
36. Electronic skin based on flexible capacitor
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Yuchen Li, Yinghan Wang, Sitong Lu, Qinshu Chen, Diansheng Chen, and Zhe Liu
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Flexibility (engineering) ,business.industry ,Computer science ,Capacitive sensing ,Electrical engineering ,Electronic skin ,STM32 ,Chip ,Capacitance ,law.invention ,Capacitor ,law ,Proximity sensor ,business - Abstract
The safety of human-machine interaction is very important in intelligent manufacturing, and the main purpose of ensuring safety is to enable the robot to receive information about the surrounding environment through proximity sensors, which can achieve good interaction between the machine and humans. In view of the current shortcomings of electronic skins, such as poor flexibility, lack of proximity sensing system, and the immeasurable magnitude of force after contact, we design a composite sensor that can realize proximity and small force haptics in this paper. We use flexible materials such as copper foil, polyimide, polyurethane and a new type of semiconductor material based on super capacitor and design a double-layer pressure-capacitance sensing structure based on the principle of human induced capacitance, variable dielectric constant and variable pitch capacitance. And we use STM32, FDC2214 chip to build a complete information acquisition and processing system.
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- 2020
37. Marine collagen peptide grafted carboxymethyl chitosan: Optimization preparation and coagulation evaluation
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Bijun Zhang, Sitong Lu, Cheng Yu, Sidong Li, Pengzhi Hong, and Zhang Hu
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Male ,Aquatic Organisms ,Chemical Phenomena ,Scanning electron microscope ,02 engineering and technology ,Biochemistry ,Coupling reaction ,03 medical and health sciences ,chemistry.chemical_compound ,Structure-Activity Relationship ,Structural Biology ,In vivo ,Animals ,Fourier transform infrared spectroscopy ,Molecular Biology ,Blood Coagulation ,030304 developmental biology ,Carbodiimide ,0303 health sciences ,Chitosan ,Spectrum Analysis ,Temperature ,General Medicine ,021001 nanoscience & nanotechnology ,In vitro ,Coagulation ,chemistry ,Hemostasis ,Female ,Blood Coagulation Tests ,Collagen ,Rabbits ,0210 nano-technology ,Peptides ,Nuclear chemistry - Abstract
Uncontrolled bleeding has always been a sudden accident, which is the main cause of casualties in war trauma, emergency events and surgical operations. Rapid hemostatic materials can effectively reduce casualties and save lives. In this paper, marine collagen peptide grafted carboxymethyl chitosan (CMCS-MCP) was synthesized by 1-ethyl-(dimethylaminopropyl) carbodiimide (EDC)-mediated coupling reaction. To obtain CMCS-MCP conjugates with different degrees of substitution (DS), the reaction conditions were investigated by single-factor tests and optimized by response surface methodology. And the sponges of CMCS-MCP were prepared by freeze-thaw cycling and freeze-drying and characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), and X-ray diffraction (XRD). To evaluate the hemostatic properties of CMCS-MCP sponges, in vitro and in vivo hemostasis tests were carried out. The results showed that the optimum preparation conditions were the mass ratio of MCP to CMCS (MMCP/MCMCS) 6:1, reaction temperature 41 °C, and reaction time 16 h. And under which the DS of 58.86% was obtained. Structure analysis showed that MCP had been successfully grafted onto the CMCS molecular chain, and the CMCS-MCP sponges were of high porosity. In vitro and in vivo hemostasis tests showed that the CMCS-MCP sponges had significant procoagulant activities, especially the one with high DS of 58.86%. The hemostasis mechanism may be that the synergistic effects of MCP and CMCS accelerated coagulation through multiple approaches. The CMCS-MCP sponges give a new insight into biomedical hemostasis materials.
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- 2020
38. Exosomes derived from breast cancer lung metastasis subpopulations promote tumor self-seeding
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Zhanxin He, Xiaojing Meng, Zhuocheng Yao, Fei Zou, Xianchong Zheng, Yutian Miao, Changqing Cai, Hehai Huang, Chunqing Cai, and Sitong Lu
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0301 basic medicine ,Lung Neoplasms ,Biophysics ,Mice, Nude ,Breast Neoplasms ,Exosomes ,Biochemistry ,Metastasis ,Flow cytometry ,Mice ,03 medical and health sciences ,Neoplasm Seeding ,Circulating tumor cell ,Breast cancer ,Nude mouse ,Cell Line, Tumor ,medicine ,Animals ,Humans ,Molecular Biology ,Mice, Inbred BALB C ,biology ,medicine.diagnostic_test ,business.industry ,Carcinoma in situ ,Cell Biology ,Neoplastic Cells, Circulating ,medicine.disease ,biology.organism_classification ,Metastatic breast cancer ,Microvesicles ,030104 developmental biology ,Cancer research ,Heterografts ,Female ,Neoplasm Recurrence, Local ,business - Abstract
Lung metastasis is a primary obstacle in the clinical treatment of metastatic breast cancer. Most patients with lung metastasis eventually die of recurrence. Recurrence may be related to self-seeding, which occurs when circulating tumor cells re-seed into the tumors they originated from (metastasis or carcinoma in situ). Tumor-derived exosomes have been intensively revealed to promote the progression of various cancers. However, whether tumor-derived exosomes play roles in tumor self-seeding has not yet been identified. By establishing a self-seeding nude mouse model, we found that exosomes derived from MDA231-LM2 cells (subpopulations of breast cancer lung metastasis) potentiate the growth of MDA-MB-231 xenografts. More importantly, laser confocal microscopy and flow cytometry results identified that MDA231-LM2-secreted exosomes promote the seeding of MDA231-LM2 cells into MDA-MB-231 xenografts. These findings suggest MDA231-LM2-secreted exosomes as a promising target to treat breast cancer lung metastasis.
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- 2018
39. A Flexible Tactile Sensor Array Based on Conductive Rubber
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Min Wang, Ruidong Hao, Sitong Lu, and Diansheng Chen
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010302 applied physics ,Materials science ,Fabrication ,Conductive rubber ,Polydimethylsiloxane ,Acoustics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry.chemical_compound ,Sensor array ,chemistry ,0103 physical sciences ,0210 nano-technology ,MATLAB ,computer ,Tactile sensor ,Contact pressure ,computer.programming_language - Abstract
In this paper, a novel flexible tactile sensor array based on conductive rubber is presented. Compared with other research results, we use the materials with complete flexibility to fabricate the soft sensors. The sensing prototype includes polydimethylsiloxane (PDMS) as the sealing layers and conductive rubber as sensing layer. This proposed tactile sensor can measure the contact pressure under wrapping one curved surface. In our study, we developed a skin-like tactile sensor array from three aspects: design procedures, fabrication techniques and test results via taking one 8×8 sensor array for example, which is a sandwich structure and the sensing material was laminated into a thin encapsulation film with 2mm in thickness. Furthermore, the sensor overcomes the fabrication complexity, chemical unsafety and environmental instability problems to some extent. In the end, the final experimental demonstration verify the feasibility of the sensor array with discrete sensing elements in measuring the tactile force via matlab.
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- 2019
40. TiO2 nanotube arrays treated with (NH4)2TiF6 dilute solution for better supercapacitive performances
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Shaoyu Zhang, Xufei Zhu, Ye Song, Ying Chen, Sitong Lu, and Huimin Cui
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Supercapacitor ,Aqueous solution ,Materials science ,Nanostructure ,Anodizing ,General Chemical Engineering ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Capacitance ,Hydrothermal circulation ,0104 chemical sciences ,Anode ,Chemical engineering ,Electrochemistry ,0210 nano-technology - Abstract
Anodic TiO2 nanotube arrays (ATNAs) have been one of the promising electrode materials for supercapacitors due to good chemical stability, large surface area and simple fabrication method. However, the specific capacitance of ATNAs is generally low. Here, we focus on the hydrothermal treatments of ATNAs in (NH4)2TiF6 dilute solutions. After the (NH4)2TiF6 hydrothermal treatments, the smooth wall of ATNAs became rough, a layer of nanoparticles were generated on the surface of nanotubes concurrently. The specific capacitance of the hydrothermally treated ATNAs increased remarkably due to the special nanostructure composed of rough tube walls and the nanoparticles embedded on the tube walls. After the hydrothermal treatment in 0.01 M (NH4)2TiF6 aqueous solution at 120 °C for 45 min, the ATNAs exhibit a specific capacitance of 31.12 mF cm−2, about a 3.1-fold improvement over the untreated ones.
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- 2017
41. Formation mechanism of petal-like micropattern and nanofibers in porous anodic alumina
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Tong Lin, Xufei Zhu, Haowen Fan, Weikang Zhang, Sitong Lu, and Jing Ma
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Nanostructure ,Materials science ,Mechanical Engineering ,Bubble ,Oxide ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Oxygen ,0104 chemical sciences ,Anode ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Mechanics of Materials ,Nanofiber ,General Materials Science ,0210 nano-technology ,Porosity ,Dissolution - Abstract
Special nanostructures of porous anodic alumina (PAA), such as the petal-like micropattern and nanofibers of alumina, cannot be explained by the classical field-assisted dissolution and dynamic equilibrium models. Here, by combination of oxygen bubble mould and plastic flow model, a reasonable explanation for these special nanostructures is proposed. The petal-like micropatterns of PAA and nanofibers of alumina are all clarified by the oxygen bubble mould and the plastic flow model. The self-ordering nanochannels of PAA are attributed to the oxide plastic flow around a gas bubble mould at each pore bottom. The petal-like micropatterns and nanofibers of alumina are attributed to chemical corrosion enhanced by the micro-gas-flow and micro-liquid-flow.
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- 2017
42. Determination of the field strength and realization of the high-field anodization of aluminum
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Dongdong Li, Min Yin, Chi Zhang, Ji Xing, Sitong Lu, and Ye Song
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Materials science ,Yield (engineering) ,Anodizing ,Oxalic acid ,Analytical chemistry ,General Physics and Astronomy ,Field strength ,02 engineering and technology ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Barrier layer ,chemistry.chemical_compound ,chemistry ,Electric field ,Physical and Theoretical Chemistry ,0210 nano-technology ,Voltage - Abstract
Previous studies suggested that high-field anodization of aluminum can be realized given that aluminum is anodized at a high voltage just below the breakdown value. However, increasing the applied voltage cannot guarantee the enhancement in electric field strength across the barrier layer of porous anodic alumina (PAA) due to a concurrent increase of the barrier-layer thickness. Here, we report comparative studies of aluminum anodization in a highly concentrated (0.75 M) and a dilute (0.1 M) oxalic acid solution. Special attention is given to the field strength during anodization. To calculate the field strengths, the barrier-layer thickness of PAA was determined by a re-anodizing technique. Electrochemical impedance spectra (EIS) were also used to measure the barrier-layer thickness to improve the reliability of the field strength measurements. Both routes can yield the same conclusion: the barrier-layer thickness increases linearly with the applied voltage. For 0.75 M oxalic acid electrolyte, the resulting regression line has a positive intercept. In this instance the field strengths can be enhanced by increasing the applied voltage. Conversely, for 0.1 M oxalic acid solution, the regression line has a negative intercept and the field strengths decrease with the applied voltage. There are different linear dependences between the barrier-layer thickness and the applied voltage that determine the change in the field strength during anodization. In the highly concentrated oxalic acid electrolyte, the high-field anodization of aluminum can be realized by enhancing the applied voltage, but cannot in the dilute acid solution. Moreover, the ordering qualities of PAA films increase with increasing field strength instead of the applied voltage. The present results may provide a decisive step towards a thorough understanding of the PAA film.
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- 2017
43. A Mathematical Model for the Growth of Anodic TiO2Nanotubes under Higher Current Density
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Shaoyu Zhang, Dongliang Yu, Xufei Zhu, Sitong Lu, Huimin Cui, Jianshou Kong, and Siwei Zhao
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Materials science ,Condensed matter physics ,Renewable Energy, Sustainability and the Environment ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Anode ,Materials Chemistry ,Electrochemistry ,0210 nano-technology ,Current density - Published
- 2017
44. Prediction of the anti-inflammatory effects of bioactive components of a Hippocampus species-based TCM formulation on chronic kidney disease using network pharmacology.
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Lingyu Zhang, Sitong Lu, Zhang Hu, Mingneng Liao, Chengpeng Li, and Songzhi Kong
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- *
CHRONIC kidney failure , *BIOACTIVE compounds , *CELLULAR signal transduction , *HIPPOCAMPUS (Brain) , *DRUG target - Abstract
Purpose: To systematically study and predict the therapeutic targets and signaling pathways of Hippocampus (HPC) against chronic kidney disease (CKD) using network pharmacology. Methods: By combining database mining, literature searching, screening of disease targets, and network construction, the effects of various components of HPC on several proteins related to CKD were predicted and the active compounds were screened. Genes related to the selected compounds were linked using the SEA database. The correlation between CKD and genes was determined using OMIM, DisGenNet, and GeneCards databases. Pathway-enrichment analyses of overlapping genes were undertaken using online databases. Results: A total of 144 compounds in HPC were identified. Analyses of clusters suggest that the active components of HPC and the target genes against the inflammation caused by CKD were due to 10 compounds and 25 genes. Metascape results showed that these HPC targets are related to CKD inflammation. Conclusion: The active components of HPC and the target genes against CKD inflammation are involved in multiple signaling pathways, such as AGE-RAGE, TLR, TNF, and NF-κB. This work provides scientific evidence to support the clinical use of HPC against CKD. [ABSTRACT FROM AUTHOR]
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- 2021
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45. Sponges of Carboxymethyl Chitosan Grafted with Collagen Peptides for Wound Healing
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Zhang Hu, Cheng Yu, Zuhao Zou, Yuntao Zhao, Sidong Li, Bijun Zhang, and Sitong Lu
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Male ,0301 basic medicine ,musculoskeletal diseases ,wound healing ,02 engineering and technology ,macromolecular substances ,Article ,Catalysis ,Cell Line ,lcsh:Chemistry ,Inorganic Chemistry ,03 medical and health sciences ,Freeze-drying ,burns ,Animals ,Viability assay ,Physical and Theoretical Chemistry ,Fourier transform infrared spectroscopy ,collagen peptides ,lcsh:QH301-705.5 ,Molecular Biology ,Spectroscopy ,Chitosan ,integumentary system ,Epidermis (botany) ,Chemistry ,Regeneration (biology) ,Organic Chemistry ,technology, industry, and agriculture ,Cell migration ,General Medicine ,021001 nanoscience & nanotechnology ,equipment and supplies ,Bandages ,In vitro ,Computer Science Applications ,carbohydrates (lipids) ,carboxymethyl chitosan ,030104 developmental biology ,lcsh:Biology (General) ,lcsh:QD1-999 ,Female ,Collagen ,Rabbits ,Peptides ,0210 nano-technology ,Wound healing ,Biomedical engineering - Abstract
Burns are physically debilitating and potentially fatal injuries. Two marine biomaterials, carboxymethyl chitosan (CMC) and collagen peptides (COP), have emerged as promising burn dressings. In this paper, sponges of carboxymethyl chitosan grafted with collagen peptide (CMC&ndash, COP) were prepared by covalent coupling and freeze drying. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were then used to characterize the prepared sponges. To evaluate the wound healing activity of the CMC&ndash, COP sponges, in vitro tests including cell viability scratch wound healing and scald wound healing experiments were performed in rabbits. Appearance studies revealed the porous nature of sponges and FTIR spectroscopy demonstrated the successful incorporation of COP into CMC. The in vitro scratch assay showed that treatment with CMC&ndash, COP sponges (at 100 &mu, g/mL) had significant effects on scratch closure. For burn wounds treated with CMC&ndash, COP, regeneration of the epidermis and collagen fiber deposition was observed on day 7, with complete healing of the epidermis and wound on days 14 and 21, respectively. Based on the pathological examination by hematoxylin and eosinstaining, the CMC&ndash, COP group demonstrated pronounced wound healing efficiencies. These results confirmed that the CMC&ndash, COP treatment enhanced cell migration and promoted skin regeneration, thereby highlighting the potential application of these sponges in burn care.
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- 2019
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46. Calcium-sensing stromal interaction molecule 2 upregulates nuclear factor of activated T cells 1 and transforming growth factor-β signaling to promote breast cancer metastasis
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Siheng Zhang, Xiaojing Meng, Zhanxin He, Hehai Huang, Sitong Lu, Xianchong Zheng, Chunqing Cai, Qiang Shen, Zhuocheng Yao, Fei Zou, and Yutian Miao
- Subjects
Stromal cell ,Epithelial-Mesenchymal Transition ,STIM2 ,Motility ,Gene Expression ,Mice, Nude ,Breast Neoplasms ,lcsh:RC254-282 ,Metastasis ,Transforming Growth Factor beta1 ,03 medical and health sciences ,Mice ,0302 clinical medicine ,Breast cancer ,Cell Movement ,Cell Line, Tumor ,medicine ,Animals ,Humans ,Neoplasm Metastasis ,Stromal Interaction Molecule 2 ,Cell Nucleus ,Mammary tumor ,Mice, Inbred BALB C ,NFATC Transcription Factors ,Chemistry ,EMT ,NFAT1 ,Mammary Neoplasms, Experimental ,medicine.disease ,lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,Metastatic breast cancer ,Gene Expression Regulation, Neoplastic ,030220 oncology & carcinogenesis ,Gene Knockdown Techniques ,Cancer research ,Heterografts ,Female ,Transforming growth factor ,Research Article ,Signal Transduction - Abstract
Background Stromal interaction molecule (STIM) 2 is a key calcium-sensing molecule that regulates the stabilization of calcium ions (Ca2+) and therefore regulates downstream Ca2+-associated signaling and cellular events. We hypothesized that STIM2 regulates epithelial-mesenchymal transition (EMT) to promote breast cancer metastasis. Methods We determined the effects of gain, loss, and rescue of STIM2 on cellular motility, levels of EMT-related proteins, and secretion of transforming growth factor-β (TGF-β). We also conducted bioinformatics analyses and in vivo assessments of breast cancer growth and metastasis using xenograft models. Results We found a significant association between STIM2 overexpression and metastatic breast cancer. STIM2 overexpression activated the nuclear factor of activated T cells 1 (NFAT1) and TGF-β signaling. Knockdown of STIM2 inhibited the motility of breast cancer cells by inhibiting EMT via specific suppression of NFAT1 and inhibited mammary tumor metastasis in mice. In contrast, STIM2 overexpression promoted metastasis. These findings were validated in human tissue arrays of 340 breast cancer samples for STIM2. Conclusion Taken together, our results demonstrated that STIM2 specifically regulates NFAT1, which in turn regulates the expression and secretion of TGF-β1 to promote EMT in vitro and in vivo, leading to metastasis of breast cancer. Electronic supplementary material The online version of this article (10.1186/s13058-019-1185-1) contains supplementary material, which is available to authorized users.
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- 2019
47. Knockdown of FAM64A suppresses proliferation and migration of breast cancer cells
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Xianchong Zheng, Zhuocheng Yao, Yutian Miao, Fei Zou, Zhanxin He, Chunqing Cai, Xinwei Chu, Hehai Huang, and Sitong Lu
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0301 basic medicine ,Epithelial-Mesenchymal Transition ,Cell ,Vimentin ,Breast Neoplasms ,Kaplan-Meier Estimate ,Transfection ,03 medical and health sciences ,0302 clinical medicine ,RNA interference ,Antigens, CD ,Cell Movement ,medicine ,Gene silencing ,Humans ,Pharmacology (medical) ,Radiology, Nuclear Medicine and imaging ,Cell Proliferation ,Gene knockdown ,Migration Assay ,biology ,business.industry ,Twist-Related Protein 1 ,Intracellular Signaling Peptides and Proteins ,Nuclear Proteins ,General Medicine ,Cadherins ,Prognosis ,G1 Phase Cell Cycle Checkpoints ,Gene Expression Regulation, Neoplastic ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,Cell culture ,030220 oncology & carcinogenesis ,Gene Knockdown Techniques ,Cancer cell ,Cancer research ,biology.protein ,MCF-7 Cells ,Female ,RNA Interference ,Snail Family Transcription Factors ,business - Abstract
FAM64A is a mitotic regulator promoting cell metaphase–anaphase transition, and it is frequently reported to be highly expressed in cancer cells. However, the role of FAM64A in human breast cancer (BrC) is poorly studied. The expression of FAM64A mRNA in BrC samples was determined by RT-qPCR assay and TCGA database mining. Kaplan–Meier plotter was used to analyze whether FAM64A expression impacted prognosis. Then, the expression of FAM64A was silenced using RNA interference. Cell-counting assay, colony formation assay and flow cytometry assay were conducted to detect proliferation; transwell migration assay, EMT-related proteins expression (E-cadherin, N-cadherin and vimentin), and EMT-related transcription factors mRNA expression (Snail, Twist, Slug) were conducted to evaluate the migration ability. FAM64A was highly expressed in human BrC samples, which was negatively associated with poor survival time. Analysis of FAM64A expression in BrC cell lines demonstrated that the expression of FAM64A was significantly correlated with the proliferation rate and migration ability of BrC cells. Indeed, knockdown of FAM64A suppressed the proliferation of MDA-MB-231 and MCF-7 cells. Importantly, we also found that silencing of FAM64A inhibited the migration of BrC cells via impeding epithelial–mesenchymal transition. Our findings suggest that FAM64A plays an important role in the proliferation and migration of BrC cells, which might serve as a potential target for BrC treatment.
- Published
- 2019
48. Additional file 1: of Calcium-sensing stromal interaction molecule 2 upregulates nuclear factor of activated T cells 1 and transforming growth factor-β signaling to promote breast cancer metastasis
- Author
-
Yutian Miao, Shen, Qiang, Siheng Zhang, Hehai Huang, Xiaojing Meng, Xianchong Zheng, Zhuocheng Yao, Zhanxin He, Sitong Lu, Chunqing Cai, and Zou, Fei
- Abstract
Online Supplementary Methods Section. (DOCX 20 kb)
- Published
- 2019
- Full Text
- View/download PDF
49. Additional file 2: of Calcium-sensing stromal interaction molecule 2 upregulates nuclear factor of activated T cells 1 and transforming growth factor-β signaling to promote breast cancer metastasis
- Author
-
Yutian Miao, Shen, Qiang, Siheng Zhang, Hehai Huang, Xiaojing Meng, Xianchong Zheng, Zhuocheng Yao, Zhanxin He, Sitong Lu, Chunqing Cai, and Zou, Fei
- Subjects
body regions ,nervous system ,fungi ,skin and connective tissue diseases - Abstract
IACUC Aprroval Document for Mouse Breast Cancer Xenograft Tumor Assessments. (PDF 643 kb)
- Published
- 2019
- Full Text
- View/download PDF
50. Additional file 3: of Calcium-sensing stromal interaction molecule 2 upregulates nuclear factor of activated T cells 1 and transforming growth factor-β signaling to promote breast cancer metastasis
- Author
-
Yutian Miao, Shen, Qiang, Siheng Zhang, Hehai Huang, Xiaojing Meng, Xianchong Zheng, Zhuocheng Yao, Zhanxin He, Sitong Lu, Chunqing Cai, and Zou, Fei
- Subjects
body regions ,nervous system ,fungi ,health care economics and organizations ,humanities - Abstract
IRB Approval Document for Human Breast Cancer Tissue Microarray Assessments. (PDF 2603 kb)
- Published
- 2019
- Full Text
- View/download PDF
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