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Girgibo N, Lü X, Hiltunen E, Peura P, Dai Z. The air temperature change effect on water quality in the Kvarken Archipelago area. Sci Total Environ 2023; 874:162599. [PMID: 36871730 DOI: 10.1016/j.scitotenv.2023.162599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
The Kvarken Archipelago is Finland's World Heritage site designated by UNESCO. How climate change has affected the Kvaken Archipelago remains unclear. This study was conducted to investigate this issue by analyzing air temperature and water quality in this area. Here we use long-term historical data sets of 61 years from several monitoring stations. Water quality parameters included chlorophyll-a; total phosphorus; total nitrogen; coliform bacteria thermos tolerant; temperature; nitrate as nitrogen; nitrite-nitrate as nitrogen, and Secchi depth and correlations analysis was conducted to identify the most relevant parameters. Based on the correlation analysis of weather data and water quality parameters, air temperature showed a significant correlation with water temperature (Pearson's correlations = 0.89691, P < 0.0001). The air temperature increased in April (R2 (goodness-of-fit) = 0.2109 &P = 0.0009) and July (R2 = 0.1207 &P = 0.0155) which has indirectly increased the chlorophyll-a level (e.g. in June increasing slope = 0.39101, R2 = 0.4685, P < 0.0001) an indicator of phytoplankton growth and abundance in the water systems. The study concludes that there might be indirect effects of the likely increase in air temperature on water quality in the Kvarken Archipelago, in particular causing water temperature and chlorophyll-a concentration to increase at least in some months.
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Affiliation(s)
- N Girgibo
- Department of Energy Technology, School of Technology and Innovations, University of Vaasa, P.O.Box 700, FIN-65101 Vaasa, Finland.
| | - X Lü
- Department of Energy Technology, School of Technology and Innovations, University of Vaasa, P.O.Box 700, FIN-65101 Vaasa, Finland; Department of Civil Engineering, Aalto University, P.O.Box 12100, FIN-02130 Espoo, Finland.
| | - E Hiltunen
- Department of Energy Technology, School of Technology and Innovations, University of Vaasa, P.O.Box 700, FIN-65101 Vaasa, Finland.
| | - P Peura
- Department of Energy Technology, School of Technology and Innovations, University of Vaasa, P.O.Box 700, FIN-65101 Vaasa, Finland.
| | - Z Dai
- College of Construction Engineering, Jilin University, Changchun 130026, China.
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Voigt R, Wienold M, Jayasankar D, Drakinskiy V, Stake J, Sobis P, Schrottke L, Lü X, Grahn HT, Hübers HW. Frequency stabilization of a terahertz quantum-cascade laser to the Lamb dip of a molecular absorption line. Opt Express 2023; 31:13888-13894. [PMID: 37157264 DOI: 10.1364/oe.483883] [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] [Indexed: 05/10/2023]
Abstract
We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) to the Lamb dip of the absorption line of a D2O rotational transition at 3.3809309 THz. To assess the quality of the frequency stabilization, a Schottky diode harmonic mixer is used to generate a downconverted QCL signal by mixing the laser emission with a multiplied microwave reference signal. This downconverted signal is directly measured by a spectrum analyzer showing a full width at half maximum of 350 kHz, which is eventually limited by high-frequency noise beyond the bandwidth of the stabilization loop.
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Zhang Z, Meng C, Hou K, Wang Z, Huang Y, Lü X. The cytological and electrophysiological effects of silver nanoparticles on neuron-like PC12 cells. PLoS One 2022; 17:e0277942. [PMID: 36512588 PMCID: PMC9746933 DOI: 10.1371/journal.pone.0277942] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 10/27/2022] [Indexed: 12/15/2022] Open
Abstract
The aim of this study was to investigate the toxic effects and mechanism of silver nanoparticles (SNPs) on the cytological and electrophysiological properties of rat adrenal pheochromocytoma (PC12) cells. Different concentrations of SNPs (20 nm) were prepared, and the effects of different application durations on the cell viability and electrical excitability of PC12 quasi-neuronal networks were investigated. The effects of 200 μM SNPs on the neurite length, cell membrane potential (CMP) difference, intracellular Ca2+ content, mitochondrial membrane potential (MMP) difference, adenosine triphosphate (ATP) content, and reactive oxygen species (ROS) content of networks were then investigated. The results showed that 200 μM SNPs produced grade 1 cytotoxicity at 48 h of interaction, and the other concentrations of SNPs were noncytotoxic. Noncytotoxic 5 μM SNPs significantly increased electrical excitability, and noncytotoxic 100 μM SNPs led to an initial increase followed by a significant decrease in electrical excitability. Cytotoxic SNPs (200 μM) significantly decreased electrical excitability. SNPs (200 μM) led to decreases in neurite length, MMP difference and ATP content and increases in CMP difference and intracellular Ca2+ and ROS levels. The results revealed that not only cell viability but also electrophysiological properties should be considered when evaluating nanoparticle-induced neurotoxicity. The SNP-induced cytotoxicity mainly originated from its effects on ATP content, cytoskeletal structure and ROS content. The decrease in electrical excitability was mainly due to the decrease in ATP content. ATP content may thus be an important indicator of both cell viability and electrical excitability in PC12 quasi-neuronal networks.
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Affiliation(s)
- Zequn Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu Province, China
| | - Chen Meng
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu Province, China
| | - Kun Hou
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu Province, China
| | - Zhigong Wang
- Institute of RF- & OE-ICs, Southeast University, Nanjing, Jiangsu Province, China
- Coinnovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
- * E-mail: (ZW); (YH); (XL)
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu Province, China
- * E-mail: (ZW); (YH); (XL)
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu Province, China
- Coinnovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
- * E-mail: (ZW); (YH); (XL)
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Zhang F, Huang Y, Zhang Y, Lü X. Screening and validation of nickel ion cytotoxicity biomarkers based on transcriptomic and proteomic technology. Regen Biomater 2022; 9:rbac073. [PMID: 36226165 PMCID: PMC9550229 DOI: 10.1093/rb/rbac073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/02/2022] [Accepted: 09/20/2022] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to screen cytotoxicity biomarkers of nickel ions (Ni2+) using transcriptomic and proteomic approaches combined with molecular biology validation. First, the MTT method was used to evaluate cytotoxicity in L929 cells treated with Ni2+ at different concentrations. Ni2+ at both 100 μM and 200 μM affected cell proliferation. Then, transcriptomic and proteomic technology was used to study the effects of Ni2+ on the expression of genes/proteins in cells. It was found that 1490, 789, 652 and 729 genes (12, 24, 48 and 72 h, respectively) and 177, 2191 and 2095 proteins (12, 24 and 48 h, respectively) were differentially expressed after treatment with 100 μM Ni2+. In total, 1403, 963, 916 and 1230 genes (12, 24, 48 and 72 h, respectively) and 83, 1681 and 2398 proteins (12, 24 and 48 h, respectively) were differentially expressed after treatment with 200 μM Ni2+. Then, four target gene/protein biomarkers were filtered by combined screening using gene/proteomic experimental data and biological pathway analyses. Further expression level validation of all these target biomarkers and functional validation of selected gene/protein biomarkers were carried out, and a final gene/protein biomarker (UQCRB) was identified.
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Affiliation(s)
- FuDan Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Yajing Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
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Zhang Y, Huang Y, Chen R, Chen S, Lü X. The interaction mechanism of nickel ions with L929 cells based on integrative analysis of proteomics and metabolomics data. Regen Biomater 2022; 9:rbac040. [PMID: 35812349 PMCID: PMC9258689 DOI: 10.1093/rb/rbac040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 05/18/2022] [Accepted: 05/28/2022] [Indexed: 11/14/2022] Open
Abstract
Abstract
The aim of this paper was to study the toxicity mechanism of nickel ions (Ni2+) on L929 cells by combining proteomics and metabolomics. First, iTRAQ-based proteomics and LC/MS metabolomics analyses were used to determine the protein and metabolite expression profiles in L929 cells after treatment with 100 μM Ni2+ for 12, 24 and 48 h. A total of 177, 2191 and 2109 proteins and 40, 60 and 74 metabolites were found to be differentially expressed. Then, the metabolic pathways in which both differentially expressed proteins and metabolites were involved were identified, and three pathways with proteins and metabolites showing upstream and downstream relationships were affected at all three time points. Furthermore, the protein-metabolite-metabolic pathway network was constructed, and two important metabolic pathways involving 4 metabolites and 17 proteins were identified. Finally, the functions of the important screened metabolic pathways, metabolites and proteins were investigated and experimentally verified. Ni2+ mainly affected the expression of upstream proteins in the glutathione metabolic pathway and the arginine and proline metabolic pathway, which further regulated the synthesis of downstream metabolites, reduced the antioxidant capacity of cells, increased the level of superoxide anions and the ratio of GSSG to GSH, led to oxidative stress, affected energy metabolism and induced apoptosis.
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Affiliation(s)
- Yajing Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Rong Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Shulin Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , 2# Si Pailou, Nanjing 210096, China
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Huang Y, Chen R, Yang S, Chen Y, Lü X. The Mechanism of Interaction Between Gold Nanoparticles and Human Dermal Fibroblasts Based on Integrative Analysis of Transcriptomics and Metabolomics Data. J Biomed Nanotechnol 2022. [DOI: 10.1166/jbn.2022.3365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The aim of this paper was to combine transcriptomics and metabolomics to analyze the mechanism of gold nanoparticles (GNPs) on human dermal fibroblasts (HDFs). First, 20-nm GNPs were prepared, and the differentially expressed genes in HDFs were subsequently screened by transcriptome
sequencing technology after 4, 8, and 24 h of treatment with GNPs. By comparing the metabolic pathways in which the metabolites obtained in a previous study were involved, the pathways involving both genes and metabolites were filtered, and the differentially expressed genes and metabolites
with upstream and downstream relationships were screened out. The gene–metabolite–metabolic pathway network was further constructed, and the functions of metabolic pathways, genes and metabolites in the important network were analyzed and experimentally verified. The results of
transcriptome sequencing experiments showed that 1904, 1216 and 489 genes were differentially expressed in HDFs after 4, 8 and 24 h of treatment with GNPs, and these genes were involved in 270, 235 and 163 biological pathways, respectively. Through the comparison and analysis of the metabolic
pathways affected by the metabolites, 7, 3 and 2 metabolic pathways with genes and metabolites exhibiting upstream and downstream relationships were identified. Through analysis of the gene–metabolite–metabolic pathway network, 4 important metabolic pathways, 9 genes and 7 metabolites
were identified. Combined with the results of verification experiments on oxidative stress, apoptosis, the cell cycle, the cytoskeleton and cell adhesion, it was found that GNPs regulated the synthesis of downstream metabolites through upstream genes in important metabolic pathways. GNPs inhibited
oxidative stress and thus did not induce significant apoptosis, but they exerted effects on several cellular functions, including arresting the cell cycle and affecting the cytoskeleton and cell adhesion.
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Affiliation(s)
- Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, PR China
| | - Rong Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, PR China
| | - Shuci Yang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, PR China
| | - Ye Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, PR China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, Jiangsu, PR China
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Hou K, Meng C, Huang Y, Zhang Z, Wang Z, Lü X. A Research on the Role and Mechanism of N-Methyl-D-Aspartate Receptors in the Effects of Silver Nanoparticles on the Electrical Excitability of Hippocampal Neuronal Networks. J Biomed Nanotechnol 2022. [DOI: 10.1166/jbn.2022.3357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this paper is to explore the role and mechanism of N-Methyl-D-Aspartate (NMDA) receptors in the effects of silver nanoparticles (SNPs) on the electrical excitability of hippocampal neuronal networks. First, the cytotoxicity of different concentrations of SNPs was evaluated
and screened by MTT experiment, then the Voltage Threshold Measurement Method (VTMM) was employed to study the effects of SNPs on the electrical excitability of hippocampal neuronal networks under non-cytotoxic (5 μM) and cytotoxic (100 μM) concentrations after different
action times. The role of NMDA receptors in the effects of SNPs on the electrical excitability of hippocampal neuronal networks was investigated through the NMDA receptor antagonist MK-801. Then, the effects of SNPs on the number of NMDA receptors and the Ca2+ content in hippocampal
neurons were further investigated, and the relationship between these changes and neuronal networks electrical excitability was discussed. The results of voltage threshold (VTh) test showed that non-cytotoxic 5 μM SNPs has an excitatory effect on hippocampal neuronal
networks, while the effect of cytotoxic 100 μM SNPs gradually changed from excitatory to inhibitory with the extension of action time. It was found that SNPs could increase the electrical excitability of neuronal networks by activating NMDA receptors through the experiments with
MK-801 antagonists. Moreover, the fluorescent staining experiments showed that the activation of NMDA receptors by SNPs can lead to an increase in the intracellular Ca2+ content, and then trigger a negative feedback regulation mechanism of neurons between the number of NMDA receptors
and intracellular Ca2+ content. The high Ca2+ content in neurons can also decrease neurons’ cell viability, which in turn leads to changes in the electrical excitability of the neuronal networks.
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Affiliation(s)
- Kun Hou
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, PR China
| | - Chen Meng
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, PR China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, PR China
| | - Zequn Zhang
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, PR China
| | - Zhigong Wang
- Institute of RF- & OE-ICs, Southeast University, Nanjing, 210096, PR China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, PR China
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Su X, Huang Y, Chen R, Zhang Y, He M, Lü X. Metabolomics analysis of poly(l-lactic acid) nanofibers' performance on PC12 cell differentiation. Regen Biomater 2021; 8:rbab031. [PMID: 34168894 PMCID: PMC8218933 DOI: 10.1093/rb/rbab031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/30/2021] [Accepted: 05/21/2021] [Indexed: 11/14/2022] Open
Abstract
The aim of this article is to reveal the influence of aligned/random poly(l-lactic acid) (PLLA) nanofibers on PC12 cell differentiation from the perspective of metabolic level. First, three materials-PLLA aligned nanofibers (PLLA AF), PLLA random nanofibers (PLLA RF) and PLLA films (control)-were prepared by electrospinning and spin coating. Their surface morphologies were characterized. Subsequently, the cell viability, cell morphology and neurite length of PC12 cells on the surface of the three materials were evaluated, indicating more neurites in the PLLA RF groups but the longer average neurite length in the PLLA AF groups. Next, the metabolite profiles of PC12 cells cultured on the surface of the three nanofibers after 12 h, 24 h and 36 h showed that, compared with the control, 51, 48 and 31 types of differential metabolites were detected at the three time points among the AF groups, respectively; and 56, 45 and 41 types among the RF groups, respectively. Furthermore, the bioinformatics analysis of differential metabolites identified two pathways and three metabolites critical to PC12 cell differentiation influenced by the nanofibers. In addition, the verification experiment on critical metabolites and metabolic pathways were performed. The integrative analysis combining cytology, metabolomics and bioinformatics approaches revealed that though both PLLA AF and RF were capable of stimulating the synthesis of neurotransmitters, the PLLA AF were more beneficial for PC12 cell differentiation, whereas the PLLA RF were less effective.
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Affiliation(s)
- Xiaoman Su
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, China
| | - Rong Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, China
| | - Yiwen Zhang
- Department of Research, SQ Medical Device Co., Ltd, 17# Xinghuo Road, Nanjing 211500, China
| | - Meichen He
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, China.,Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province 226019, China
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Lü X, Huang Y, Qu Y, Zhang Y, Zhang Z. Integrated transcriptomic and proteomic study on the different molecular mechanisms of PC12 cell growth on chitosan and collagen/chitosan films. Regen Biomater 2020; 7:553-565. [PMID: 33365141 PMCID: PMC7748450 DOI: 10.1093/rb/rbaa030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 05/25/2020] [Accepted: 07/06/2020] [Indexed: 12/11/2022] Open
Abstract
The purpose of this article is to integrate the transcriptomic analysis and the proteomic profiles and to reveal and compare the different molecular mechanisms of PC12 cell growth on the surface of chitosan films and collagen/chitosan films. First, the chitosan films and the collagen/chitosan films were prepared. Subsequently, the cell viability assay was performed; the cell viability of the PC12 cells cultured on the collagen/chitosan films for 24 h was significantly higher than that on the chitosan films. Then, with cDNA microarray, the numbers of differentially expressed genes of PC12 cells on the surface of chitosan and collagen/chitosan films were 13349 and 5165, respectively. Next, the biological pathway analysis indicated that the differentially expressed genes were involved in 40 pathways directly related to cell adhesion and growth. The integrated transcriptomic and our previous proteomic analysis revealed that three biological pathways-extracellular matrix-receptor interaction, focal adhesion and regulation of actin cytoskeleton-were regulated in the processes of protein adsorption, cell adhesion and growth. The adsorbed proteins on the material surfaces further influenced the expression of important downstream genes by regulating the expression of related receptor genes in these three pathways. In comparison, chitosan films had a strong inhibitory effect on PC12 cell adhesion and growth, resulting in the significantly lower cell viability on its surface; on the contrary, collagen/chitosan films were more conducive to promoting PC12 cell adhesion and growth, resulting in higher cell viability.
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Affiliation(s)
- Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yayun Qu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yiwen Zhang
- SQ Medical Device Co., Ltd, Nanjing 210008, China
| | - Zequn Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
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Yan H, Aizhan R, Lu YY, Li X, Wang X, Yi YL, Shan YY, Liu BF, Zhou Y, Lü X. A novel bacteriocin BM1029: physicochemical characterization, antibacterial modes and application. J Appl Microbiol 2020; 130:755-768. [PMID: 32749036 DOI: 10.1111/jam.14809] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 06/15/2020] [Accepted: 07/22/2020] [Indexed: 12/28/2022]
Abstract
AIM Bacteriocins with antimicrobial activity are considered as potential natural bio-preservatives to control the growth of food spoilage bacteria. The aim of this work was to characterize a novel bacteriocin BM1029 discovered from Lactobacillus crustorum MN047 and evaluate its antibacterial mechanism. METHODS AND RESULTS Bacteriocin BM1029 was purified by cation-exchange chromatography and reversed-phase chromatography. Antibacterial activity assay showed that BM1029 is antagonistic against both Gram-positive and Gram-negative bacteria. Furthermore, it was found that BM1029 showed low haemolysis with high stability to the pretreatment with different temperatures, pH and surfactants. Moreover electron microscopy and flow cytometry suggested that BM1029 inhibit indicator strains by damaging the cell envelope integrity. Cell cycle assay suggested that BM1029 arrested cell cycle in R-phase. CONCLUSION The novel bacteriocin BM1029 showed high bactericidal activity against Escherichia coli and Staphylococcus aureus through a cell envelope-associated mechanism. SIGNIFICANCE AND IMPACT OF THE STUDY Application of BM1029 inhibited the growth of indicator strains on beef meat storage at 4°C suggesting that this bacteriocin is promising to be used as a novel preservative in food processing and preservation.
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Affiliation(s)
- H Yan
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - R Aizhan
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Y Y Lu
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - X Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - X Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Y L Yi
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Y Y Shan
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - B F Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - Y Zhou
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
| | - X Lü
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province, China
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Huang Y, Lü X, Chen R, Chen Y. Comparative study of the effects of gold and silver nanoparticles on the metabolism of human dermal fibroblasts. Regen Biomater 2020; 7:221-232. [PMID: 32296541 PMCID: PMC7147366 DOI: 10.1093/rb/rbz051] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 11/25/2019] [Accepted: 12/04/2019] [Indexed: 12/26/2022] Open
Abstract
The purpose of this article was to explore the effects of gold nanoparticles (GNPs) and silver nanoparticles (SNPs) with different cytotoxicities on human dermal fibroblasts (HDFs) at the metabolic level. First, ∼20 nm of GNPs and SNPs were prepared, and their effects on the proliferation of HDFs were evaluated. Then, a metabolomics technique was used to analyse the effects of GNPs and SNPs on the expression profiles of metabolites in HDFs after 4, 8 and 24 h of treatment. Furthermore, the key metabolites and key metabolic pathways involved in the interaction of GNPs and SNPs with HDFs were identified through expression pattern analysis and metabolic pathway analysis of differentially expressed metabolites and were finally verified by experiments. The results of the cytotoxicity experiments showed that there was no cytotoxicity after the treatment of GNPs for 72 h, while the cytotoxicity of the SNPs reached grade 1 after 72 h. By using metabolomics analysis, 29, 30 and 27 metabolites were shown to be differentially expressed in HDFs after GNP treatment, while SNPs induced the differential expression of 13, 33 and 22 metabolites after 4, 8 and 24 h of treatment, respectively. Six and four candidate key metabolites in the GNP and SNP groups were identified by expression pattern analysis and metabolic pathway analysis, respectively. The key metabolic pathways in the GNP and SNP groups were identified as the glutathione metabolic pathway (the key metabolite of which was glutathione) and the citrate cycle pathway (the key metabolite of which was malic acid). Based on the experiments used to verify the key metabolites and key metabolic pathways, it was found that the increase in glutathione after GNP treatment might trigger an oxidative stress protection mechanism and thus avoid cytotoxicity. After exposure to SNPs, the citric acid content was increased, mainly through the citrate cycle pathway, thereby inhibiting the synthesis of malic acid to affect the formation of ATP and finally leading to cytotoxicity.
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Affiliation(s)
- Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Rong Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
| | - Ye Chen
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P.R. China
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Alam T, Wienold M, Lü X, Biermann K, Schrottke L, Grahn HT, Hübers HW. Frequency and power stabilization of a terahertz quantum-cascade laser using near-infrared optical excitation. Opt Express 2019; 27:36846-36854. [PMID: 31873456 DOI: 10.1364/oe.27.036846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/07/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate a technique to simultaneously stabilize the frequency and output power of a terahertz quantum-cascade laser (QCL). This technique exploits frequency and power variations upon near-infrared illumination of the QCL with a diode laser. It does not require an external terahertz optical modulator. By locking the frequency to a molecular absorption line, we obtain a long-term (one-hour) linewidth of 260 kHz (full width at half maximum) and a root-mean-square power stability below 0.03%. With respect to the free-running case, this stabilization scheme improves the frequency stability by nearly two orders of magnitude and the power stability by a factor of three.
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Huang Y, Lü X, Lü X. Cytotoxic Mechanism for Silver Nanoparticles Based High-Content Cellomics and Transcriptome Sequencing. J Biomed Nanotechnol 2019; 15:1401-1414. [DOI: 10.1166/jbn.2019.2785] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to investigate the toxic mechanism for differently sized silver nanoparticles (SNPs) on human dermal fibroblasts (HDFs), by combining high content cellomics and transcriptome sequencing. First, the influences of five SNPs (SNP-5, SNP-20, SNP-50, SNP-100, and
SNP-200) on O–2, focal adhesion, cytoskeleton and ATP content in HDFs were studied with high content screening and colorimetric method, and the role to cytotoxicity was analysed. Transcriptome sequencing technique was then to filter differentially expressed genes
induced by SNPs after 4 h treatment. Key pathways in SNP-induced cytotoxicity were also screened via biological pathway analysis. Furthermore, key genes in HDFs after SNP-induced cytotoxicity were determined through matching analysis with previously obtained important microRNAs and their expression
levels were verified with qRT-PCR. Cytological experiments showed that the SNP-5 had the strongest effects on O–2, focal adhesion, cytoskeleton and ATP content, while SNP-20 had the smallest effects. Transcriptome sequencing results showed that 3848, 4213, 2999,
3251 and 5104 genes were found to be differentially expressed in HDFs after treatment with five SNPs. Biological pathway analysis for 1643 uniformly differentially expressed genes revealed that MAPK signaling pathway was the key pathway in SNP-induced cytotoxicity. Two key genes, SOS1
and CDC25B, which are involved in MAPK signaling pathway were finally identified through matching analysis with important microRNAs and verification. In conclusion, the cytotoxic mechanism for SNPs induced cytotoxicity in HDFs involved SNPs down-regulated expression of SOS1
and CDC25B through miR-424-5p in the key MAPK signaling pathway, through blocking of cell cycle, promotion of apoptosis, ultimately leading to cytotoxicity.
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Lü X, Luo T, Liu L, Zhou H, Meng J. [Clinical features of primary tracheobronchial pulmonary amyloidosis]. Zhonghua Yi Xue Za Zhi 2019; 99:918-922. [PMID: 30917441 DOI: 10.3760/cma.j.issn.0376-2491.2019.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: To analyze the clinical features of primary tracheobronchial pulmonary amyloidosis (PTBA). Methods: The records of 11 patients with PTBA diagnosed by pathology from January 2002 to June 2018 in Xiangya Hospital of Central South University were retrospectively reviewed, including clinical manifestations, laboratory and imaging examination, bronchoscopic manifestations and therapies. Meanwhile, PTBA was staged based on the severity and extent of lesion under bronchoscopy. Results: The most common clinical symptoms were cough and expectoration followed by shortness of breath and hemoptysis. Chest computed tomography (CT) revealed pulmonary infection (4/11), pulmonary nodules and masses (5/11), interstitial lesions (2/11), tracheal bronchial wall thickening (5/11) or airway stenosis (4/11). Bronchoscopy showed mucosal hypertrophy (8/11), nodular bulge (3/11), and luminal stenosis (6/11). According to the lesion involvement, 1 case only involved the lungs, 10 cases involved the trachea and/or bronchus, with (8/10) or without (2/10) lung lesions. According to the bronchoscopic staging, 2 cases (2/10) in the stage Ⅰ, lesions were limited; 2 cases (2/10) in the stage Ⅱ, lesions were diffuse; 6 cases (6/10) in the stage Ⅲ, diffuse lesions with stenosis. Conclusions: PTBA is a rare disease of the respiratory system, with unspecific clinical manifestations and diverse pulmonary imaging findings; airway mucosal hypertrophy and nodular bulging can be seen under bronchoscopy. Patients with advanced stage may present with airway stenosis.
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Affiliation(s)
- X Lü
- Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Respiratory Disease, Xiangya Hospital, Central South University, Changsha 410000, China
| | - T Luo
- Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Respiratory Disease, Xiangya Hospital, Central South University, Changsha 410000, China (is working in the Department of Respiratory Medicine, Central Hospital of Shaoyang, Shaoyang 422000, China)
| | - L Liu
- Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Respiratory Disease, Xiangya Hospital, Central South University, Changsha 410000, China (is working in the Department of Respiratory Medicine, Hunan Provincial General Team Hospital of Armed Police, Changsha 410000, China)
| | - H Zhou
- Department of Radiology, Xiangya Hospital, Central South University, Changsha 410000, China
| | - J Meng
- Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Respiratory Disease, Xiangya Hospital, Central South University, Changsha 410000, China
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Fang J, Li P, Lu X, Fang L, Lü X, Ren F. A strong, tough, and osteoconductive hydroxyapatite mineralized polyacrylamide/dextran hydrogel for bone tissue regeneration. Acta Biomater 2019; 88:503-513. [PMID: 30772515 DOI: 10.1016/j.actbio.2019.02.019] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [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: 11/05/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 01/01/2023]
Abstract
The design of hydrogels with adequate mechanical properties and excellent bioactivity, osteoconductivity, and capacity for osseointegration is essential to bone repair and regeneration. However, it is challenging to integrate all these properties into one bone scaffold. Herein, we developed a strong, tough, osteoconductive hydrogel by a facile one-step micellar copolymerization of acrylamide and urethacrylate dextran (Dex-U), followed by the in situ mineralization of hydroxyapatite (HAp) nanocrystals. We show that the soft, flexible, and hydrophobically associated polyacrylamide (PAAm) network is strengthened by the stiff crosslinked Dex-U phase, and that the mineralized HAp simultaneously improves the mechanical properties and osteoconductivity. The obtained HAp mineralized PAAm/Dex-U hydrogel (HAp-PADH) has extremely high compressive strength (6.5 MPa) and enhanced fracture resistance (over 2300 J m-2), as compared with pure PAAm hydrogels. In vitro, we show that the mineralized HAp layer promotes the adhesion and proliferation of osteoblasts, and effectively stimulates osteogenic differentiation. Through the in vivo evaluation of hydrogels in a femoral condyle defect rabbit model, we show regeneration of a highly mineralized bone tissue and direct bonding to the HAp-PADH interface. These findings confirm the excellent osteoconductivity and osseointegration ability of fabricated HAp-PADH. The present HAp-PADH, with its superior mechanical properties and excellent osteoconductivity, should have great potential for bone repair and regeneration. STATEMENT OF SIGNIFICANCE: We developed a strong, tough, and osteoconductive hydrogel by a facile one-step micellar copolymerization of acrylamide and urethane methacrylate dextran (Dex-U), followed by the in situ mineralization of hydroxyapatite (HAp) nanocrystals. The hydrophobic micellar copolymerization and introduction of the stiff crosslinked Dex-U phase endowed the soft polyacrylamide (PAAm) network with enhanced strength and toughness. The in situ mineralized HAp nanocrystals on the hydrogels further improved the mechanical properties of the hydrogels and promoted osteogenic differentiation of cells. Mechanical tests together with in vitro and in vivo evaluations confirmed that the HAp mineralized PAAm/Dex-U hydrogel (HAp-PADH) achieved a combination of superior mechanical properties and excellent osseointegration, and thus may offer a promising candidate for bone repair and regeneration.
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Affiliation(s)
- Ju Fang
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China; State Key Laboratory of Bioelectronics, Southeast University, Nanjing, Jiangsu 210096, China
| | - Pengfei Li
- Key Lab of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 621000, China
| | - Xiong Lu
- Key Lab of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 621000, China
| | - Liming Fang
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, Guangdong 510006, China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, Jiangsu 210096, China
| | - Fuzeng Ren
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
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Alam T, Wienold M, Lü X, Biermann K, Schrottke L, Grahn HT, Hübers HW. Wideband, high-resolution terahertz spectroscopy by light-induced frequency tuning of quantum-cascade lasers. Opt Express 2019; 27:5420-5432. [PMID: 30876146 DOI: 10.1364/oe.27.005420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
Near-infrared optical excitation enables wideband frequency tuning of terahertz quantum-cascade lasers. In this work, we demonstrate the feasibility of the approach for molecular laser absorption spectroscopy. We present a physical model which explains the observed frequency tuning characteristics by the optical excitation of an electron-hole plasma. Due to an improved excitation configuration as compared to previous work, we observe a single-mode continuous-wave frequency coverage of as much as 40 GHz for a laser at 3.1 THz. This represents, for the same device, a ten-fold improvement over the usually employed tuning by current. The method can be readily applied to a large class of devices.
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Huang Y, Lü X, Lü X. Study of Key Biological Pathways and Important microRNAs Involved in Silver Nanoparticles Induced Cytotoxicity Based on microRNA Sequencing Technology. J Biomed Nanotechnol 2018; 14:2042-2055. [PMID: 30305212 DOI: 10.1166/jbn.2018.2643] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to screen and research key biological pathways and important microRNAs (miRNAs) involved in silver nanoparticles (SNPs) induced cytotoxicity using miRNA sequencing technology. First, the influences of five SNPs with different sizes (∼5, ∼20, ∼50, ∼100 and ∼200 nm), named as SNP-5, SNP-20, SNP-50, SNP-100, and SNP-200, on human dermal fibroblasts (HDFs) proliferation were evaluated by MTT assay after 4, 8, 12, 24, 48 and 72 h. miRNA sequencing technology was then utilized to screen differentially expressed miRNAs in SNPs treated HDFs for 4 h. Bioinformatics analysis was performed to screen key biological pathways and important miRNAs in SNP-induced cytotoxicity. Finally, the functions of key biological pathways and expression level of important miRNAs were verified using different cellular/molecular biology experiments. MTT results showed that the effect of SNP-5 on cell proliferation was greatest at all-time points, while the effect of SNP-20 was minimal. miRNA sequencing results showed that 457, 76, 177, 461 and 341 miRNAs were found to be differentially expressed in HDFs after treatment with five SNPs. Biological pathway analysis for differentially expressed miRNAs revealed that MAPK signaling pathway played a key role in SNP-induced cytotoxicity and its functions were verified by cell cycle and cell apoptosis tests. Four important miRNAs (miR-424-5p, miR-340-5p, miR-30b-5p, and miR-132-3p) were screened and expressions of miR-424-5p and miR-340-5p were confirmed by qRT-PCR. In conclusion, results from this study suggested that the SNPs arrested cell cycle, promoted cell apoptosis and finally induced cytotoxicity mainly through the MAPK signaling pathway. The expression of two important miRNAs had strong correlation with cytotoxicity of differently sized SNPs.
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Lü X, Zhang H, Huang Y, Zhang Y. A proteomics study to explore the role of adsorbed serum proteins for PC12 cell adhesion and growth on chitosan and collagen/chitosan surfaces. Regen Biomater 2018; 5:261-273. [PMID: 30338124 PMCID: PMC6184651 DOI: 10.1093/rb/rby017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 05/28/2018] [Accepted: 06/02/2018] [Indexed: 12/15/2022] Open
Abstract
The aim of this article is to apply proteomics in the comparison of the molecular mechanisms of PC12 cell adhesion and growth mediated by the adsorbed serum proteins on the surfaces of chitosan and collagen/chitosan films. First, the chitosan and the collagen/chitosan films were prepared by spin coating; and their surface morphologies were characterized by scanning electron microscopy, X-ray energy dispersive spectroscopy, contact angle measurement and Fourier transform infrared spectroscopy. Subsequently, cell proliferation experiments on two materials were performed and the dynamic curves of protein adsorption on their surfaces were measured. Then, proteomics and bioinformatics were used to analyze and compare the adsorbed serum proteins on the surfaces of two biomaterials; and their effects on cell adhesion were discussed. The results showed that the optimum concentration of chitosan film was 2% w/v. When compared with chitosan film, collagen/chitosan film promoted the growth and proliferation of PC12 cells more significantly. Although the dynamic curves showed no significant difference in the total amount of the adsorbed proteins on both surfaces, proteomics and bioinformatics analyses revealed a difference in protein types: the chitosan surface adsorbed more vitronectin whereas collagen/chitosan surface adsorbed more fibronectin 1 and contained more cell surface receptor binding sites and more Leu-Asp-Val sequences in its surface structure; the collagen/chitosan surface were more conducive to promoting cell adhesion and growth.
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Affiliation(s)
- Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, P.R. China
| | - Heng Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, P.R. China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, P.R. China
| | - Yiwen Zhang
- SQ Medical Device Co., Ltd., Nanjing, P.R. China
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Lü X, Qu Y, Hong Y, Huang Y, Zhang Y, Yang D, Zhang F, Xi T, Zhang D. A high-throughput study on endothelial cell adhesion and growth mediated by adsorbed serum protein via signaling pathway PCR array. Regen Biomater 2017; 5:25-34. [PMID: 29423265 PMCID: PMC5798144 DOI: 10.1093/rb/rbx030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/15/2017] [Accepted: 11/20/2017] [Indexed: 12/17/2022] Open
Abstract
The purpose of this paper is to utilize the signaling pathway polymerase chain reaction (PCR) arrays to investigate the activation of two important biological signaling pathways in endothelial cell adhesion and growth mediated by adsorbed serum protein on the surface of bare and titanium nitride (TiN)-coated nickel titanium (NiTi) alloys. First, the endothelial cells were cultured on the bare and TiN-coated NiTi alloys and chitosan films as control for 4 h and 24 h, respectively. Then, the total RNA of the cells was collected and the PCR arrays were performed. After that, the differentially expressed genes in the transforming growth factor beta (TGF-β) signaling pathway and the regulation of actin cytoskeleton pathway were screened out; and the further bioinformatics analyses were performed. The results showed that both TGF-β signaling pathway and regulation of actin cytoskeleton pathway were activated in the cells after 4 h and 24 h culturing on the surface of bare and TiN-coated NiTi alloys compared to the chitosan group. The activated TGF-β signaling pathway promoted cell adhesion; the activated regulation of actin cytoskeleton pathway promoted cell adhesion, spreading, growth and motility. In addition, the activation of both pathways was much stronger in the cells cultured for 24 h versus 4 h, which indicated that cell adhesion and growth became more favorable with longer time on the surface of two NiTi alloy materials.
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Affiliation(s)
- Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Yayun Qu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Ying Hong
- Nanjing Drum Tower Hospital, Nanjing 210008, P.R. China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Yiwen Zhang
- SQ Medical Device Co., Ltd., Nanjing 210008, P.R. China
| | - Dayun Yang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Fudan Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Tingfei Xi
- Shenzhen Research Institute, Peking University, Shenzhen 518055, P.R. China and
| | - Deyuan Zhang
- R&D Center of Lifetech Scientific (Shenzhen) Co., Ltd, Shenzhen 518057, P.R. China
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Yang F, Yu Y, Lü X. A Systematic Study of PLLA Aligned Nanofiber-Induced Differentiation of PC12 Cells Using mRNA-microRNAProtein Biomics Integrated Analyses. J Biomed Nanotechnol 2017; 13:1045-1057. [PMID: 31251138 DOI: 10.1166/jbn.2017.2380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to explore the regulatory molecular mechanism of microRNA (miRNA) in poly(L-lactic acid) (PLLA) nanofiber-induced PC12 cell differentiation by combining transcriptomics, proteomics and miRNA sequencing technology. Primarily, PLLA random/aligned nanofibers were fabricated by electrospinning, and their morphology, chemical composition and mechanical properties were measured. Next, PC12 cells were planted on the PLLA film (control), PLLA random nanofibers (RF) and PLLA aligned nanofibers (AFs), and the morphology and synapse length of the PC12 cells were observed. Furthermore, isobaric tags for relative and absolute quantitation (iTRAQ)-labeled proteomics qualification technologies were applied to identify protein expression information of PC12 cells, and differentially expressed proteins were determined. To elucidate the regulatory relationship among mRNA, miRNA and protein, bioinformatics methods were adopted to analyze the proteomics data using early mRNA profile data and miRNA sequencing data, from which collective gene ontologies, biological pathways and the matched miRNA mRNA/protein target pairs were filtered. The experiment yielded the following results: 1. PLLA random/aligned nanofibers were composed of PLLA, and all the materials were uniform. 2. The modulus elasticity of PLLA aligned nanofibers was dramatically higher than that of PLLA random nanofibers. 3. PC12 cells were in good condition in all three groups. 4. Cells were nearly round in the control group and extended synapses in the RF and AF groups, yet they had shorter and randomly oriented synapses in the RF group. However, the length of the synapses was significantly increased in the AF group compared with that of the control and RF groups. More specifically, there were 235 and 281 differentially expressed proteins in the RF and AF groups, respectively, compared with the control group. Comparing the integrated analysis of the proteomics experimental data with the miRNA and mRNA profiles, collective differentially expressed data were involved in 2 and 5 gene ontologies and 4 and 7 biological pathways in the RF and AF groups, respectively, which were related to cell differentiation. Through data comparison, 0 and 5 matched miRNA genes/proteins pairs were filtered in the RF and AF groups, respectively. Further discussion revealed that PLLA aligned nanofibers could regulate 5 mRNA/protein target pairs (Dnajb12, Rhob, Wbp11, Hmgcs1 and Hmgn2) by 8 miRNAs (miR-24, miR-25, miR-92a, miR-19b, miR-183, miR-29a, miR-29c and miR-23b) and further regulate 'focal adhesion' pathways and many functions (e.g., cell adhesion, transport, gene transcription, biosynthesis, and DNA assembly), which could finally influence the migration and differentiation of PC12 cells. The results showed that the focal adhesion pathway, integrin-mediated cell adhesion pathway, MAPK pathway and TGF-β pathway play key functions in the process of PLLA-aligned, nanofiber-induced PC12 cell differentiation.
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Yang CX, Wang T, Gao LN, Yin HJ, Lü X. Isolation, identification and characterization of lignin-degrading bacteria from Qinling, China. J Appl Microbiol 2017; 123:1447-1460. [PMID: 28801977 DOI: 10.1111/jam.13562] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 07/19/2017] [Accepted: 08/01/2017] [Indexed: 11/30/2022]
Abstract
AIMS Lignin is an aromatic heteropolymer forming a physical barrier and it is a big challenge in biomass utilization. This paper first investigated lignin-degradation bacteria from rotten wood in Qinling Mountain. METHODS AND RESULTS Nineteen potential strains were selected and ligninolytic enzyme activities were determined over 84 h. Strains that had higher enzyme activities were selected. Further, the biodegradation of wheat straw lignin and alkali lignin was evaluated indicating that Burkholderia sp. H1 had the highest capability. It was confirmed by gel permeation chromatography and field emission scanning electron microscope that alkali lignin was depolymerized into small fragments. The degraded products were analysed using gas chromatography-mass spectrometry. The total ion chromatograph of products treated for 7 days showed the formation of aromatic compounds, an important intermediate from lignin degradation. Interestingly, they disappeared in 15 days while the aldehyde and ester compounds increased. CONCLUSIONS The results suggest that the lignin-degrading bacteria are abundant in rotten wood and strain H1 has high potential to break down lignin. SIGNIFICANCE AND IMPACT OF THE STUDY The diversity of lignin-degrading bacteria in Qinling Mountain is revealed. The study of Burkholderia sp. H1 expands the range of bacteria for lignin degradation and provides novel bacteria for application to lignocellulosic biomass.
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Affiliation(s)
- C-X Yang
- College of Food Science and Engineering, Northwest A&F University, Yangling District, Shaanxi Province, China
| | - T Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling District, Shaanxi Province, China
| | - L-N Gao
- College of Food Science and Engineering, Northwest A&F University, Yangling District, Shaanxi Province, China
| | - H-J Yin
- College of Food Science and Engineering, Northwest A&F University, Yangling District, Shaanxi Province, China
| | - X Lü
- College of Food Science and Engineering, Northwest A&F University, Yangling District, Shaanxi Province, China
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Lü X, Yang F, Huang Y, Yu Y. Role of integrin in influencing differentiation of PC12 cell grown on PLLA-aligned nanofiber: a mRNA–microRNA–protein integrative study. Regen Biomater 2016. [DOI: 10.1093/rb/rbw040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong 226001, PR China
| | - Fei Yang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China
| | - Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China
| | - Yadong Yu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China
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Abstract
The aim of this study was to unveil the mechanism by which aligned nanofibers influence neuronal differentiation. PC12 cells were seeded on three different poly(L-lactic acid) (PLLA) substrates (PLLA films (control), electrospun PLLA random nanofibers (RF) and electrospun PLLA aligned nanofibers (AF)). Subsequently, cellular experiments, cDNA microarrays and molecular biological approaches were employed to investigate the impacts of the different PLLA substrates on PC12 cell differentiation. Scanning electron microscope observation revealed that neurite outgrowth in the AF group was parallel to the direction of nanofiber alignment and that the filopodias at the neurite tips spread along the aligned nanofiber axis. Meanwhile, both neurite length and the expression of GAP43 (a neuronal differentiation marker gene) were higher in the AF group than those in the control and RF groups. These results suggested that the PLLA aligned nanofibers enhanced PC12 cell differentiation. cDNA microarray experiment revealed that 876 and 1937 genes had significantly changed expression in the RF and AF groups, respectively. Based on gene ontology analysis, 493 and 1193 differentially expressed genes involved in neuronal differentiation were found in the RF and AF groups, respectively. Pathway analysis showed that the PLLA aligned nanofibers mainly mediated their effects via integrin-mediated pathways. qRT-PCR and western blotting assays further confirmed that gene and protein expression levels in the integrin-mediated FAK-MEK-ERK pathway (e.g., Tln1, Mapk6, phosphorylated-ERK1/2) were enhanced by the PLLA aligned nanofibers. Both PC12 cell differentiation and the expressions of genes and proteins in the integrin-mediated FAK-MEK-ERK pathway were inhibited when integrins were blocked by the pentapeptide GRGDS. In addition, the Pafah1b-1 gene was found to be involved in PLLA aligned nanofibers' promotion of PC12 cell differentiation. Taken together, the results suggested that PLLA aligned nanofibers might cooperate with nerve growth factor (NGF) to induce PC12 cell differentiation by activating the integrin-mediated FAK-MEK-ERK pathway and the Pafah1b1 gene.
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Abstract
OBJECTIVE Aligned nanofibers (AFs) are regarded as promising biomaterials in nerve tissue engineering. However, a full understanding of the biocompatibility of AFs at the molecular level is still challenging. Therefore, the present study focused on identifying the microRNA (miRNA)-mediated regulatory mechanism by which poly-L-lactic acid (PLLA) AFs influence PC12 cell differentiation. APPROACH Firstly, the effects of PLLA random nanofibers (RFs)/AFs and PLLA films (control) on the biological responses of PC12 cells that are associated with neuronal differentiation were examined. Then, SOLiD sequencing and cDNA microarray were employed to profile the expressions of miRNAs and mRNAs. The target genes of the misregulated miRNAs were predicted and compared with the mRNA profile data. Functions of the matched target genes (the intersection between the predicted target genes and the experimentally-determined, misregulated genes) were analyzed. MAIN RESULTS The results revealed that neurites spread in various directions in control and RF groups. In the AF group, most neurites extended in parallel with each other. The glucose consumption and lactic acid production in the RF and AF groups were higher than those in the control group. Compared with the control group, 42 and 94 miRNAs were significantly dysregulated in the RF and AF groups, respectively. By comparing the predicted target genes with the mRNA profile data, five and 87 matched target genes were found in the RF and AF groups, respectively. Three of the matched target genes in the AF group were found to be associated with neuronal differentiation, whereas none had this association in the RF group. The PLLA AFs induced the dysregulation of miRNAs that regulate many biological functions, including axonal guidance, lipid metabolism and long-term potentiation. In particular, two miRNA-matched target gene-biological function modules associated with neuronal differentiation were identified as follows: (1) miR-23b, miR-18a, miR-107 and miR-103 regulate the Rras2 and Nf1 gene and thereby, affect cytoskeleton regulation and MAPK pathway; (2) miR-92a, miR-339-5p, miR-25, miR-125a-5p, miR-351 and miR-19b co-regulate the Pafah1b1 gene, affecting PC12 cell migration and differentiation. SIGNIFICANCE This work demonstrates a bioinformatic approach to accomplish miRNA-mRNA profile integrative analysis and provides more insights for understanding the regulatory mechanism of miRNA in AFs affecting neuronal differentiation. These findings will be greatly beneficial for the application and design of AFs in nerve tissue engineering.
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Affiliation(s)
- Yadong Yu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, People's Republic of China
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Affiliation(s)
- S. Zong
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
| | - W. Wei
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
- Center of Analysis and TestJiangsu University, Zhenjiang 212013, China
| | - H. Cui
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
| | - Z. Jiang
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
| | - X. Lü
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
| | - M. Zhang
- Environmental Materials and Environmental Engineering Key Laboratory of Jiangsu ProvinceYangzhou 225001, China
| | - J. Xie
- School of Chemistry and Chemical EngineeringJiangsu University, Zhenjiang 212013, China
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Huang Y, Lü X, Qu Y, Yang Y, Wu S. MicroRNA sequencing and molecular mechanisms analysis of the effects of gold nanoparticles on human dermal fibroblasts. Biomaterials 2014; 37:13-24. [PMID: 25453934 DOI: 10.1016/j.biomaterials.2014.10.042] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 10/02/2014] [Indexed: 10/24/2022]
Abstract
The aim of this study is to investigate the mechanism of the effects of gold nanoparticles (GNPs) on human dermal fibroblasts (HDFs) at the microRNA level. First, 20-nm GNPs were synthesized and their effect on HDF proliferation was assayed. SOLiD sequencing technology was then utilized to obtain the microRNA expression profile after GNP treatment. The microRNA expression data were compared with previously obtained mRNA and protein expression data to identify the microRNA target mRNAs/proteins. Moreover, bioinformatics analyses and validation experiments were conducted. Lastly, the roles of GNPs and silver nanoparticle (SNPs) on HDFs were compared at the microRNA level. The results showed that GNPs were not cytotoxic as 202 microRNAs were differentially expressed after treatment with 200 μm GNPs for 1, 4 and 8 h. Bioinformatics analyses revealed that these dysregulated miRNAs mainly functioned in metabolic processes and participated in 71 biological pathways, including two key pathways in which the differentially expressed miRNA, target mRNAs and proteins were simultaneously joined, the mRNA processing pathway and MAPK signaling pathway. Biological experiments in cells confirmed that GNPs affected energy metabolism but did not induce apoptosis, destroy the cytoskeleton or induce reactive oxygen species (ROS) production. Comparing the mechanism of the effects of GNPs and SNPs on HDFs at the microRNA level, it was found that, unlike SNPs, GNPs impacted the cell cycle, weakened the ATP synthesis inhibition and cytoskeleton damage, suppressed apoptosis, and did not lead to cytotoxicity. The difference in ROS production by these two nanoparticles might partially explain the fact that GNPs showed no cytotoxic effects on HDFs, unlike SNPs.
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Affiliation(s)
- Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, PR China
| | - Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, PR China.
| | - Yinghua Qu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, PR China
| | - Yamin Yang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, PR China
| | - Si Wu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2# Si Pailou, Nanjing 210096, PR China
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Zhang Z, Wang J, Lü X. An integrated study of natural hydroxyapatite-induced osteogenic differentiation of mesenchymal stem cells using transcriptomics, proteomics and microRNA analyses. Biomed Mater 2014; 9:045005. [DOI: 10.1088/1748-6041/9/4/045005] [Citation(s) in RCA: 18] [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: 12/19/2022]
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Lü X, Wang J, Li B, Zhang Z, Zhao L. Gene expression profile study on osteoinductive effect of natural hydroxyapatite. J Biomed Mater Res A 2013; 102:2833-41. [PMID: 24115491 DOI: 10.1002/jbm.a.34951] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/29/2013] [Accepted: 09/09/2013] [Indexed: 01/26/2023]
Abstract
The aim of this study was to investigate the osteoinductive effect of natural hydroxyapatite (NHA). NHA was extracted from pig bones and prepared into disk-like samples. Then, proliferation of mouse bone mesenchymal stem cells (MSCs) cultured on NHA was assessed by the methylthiazoltetrazolium (MTT) assay. Furthermore, microarray technology was applied to obtain the gene expression profiles of MSCs cultured on NHA at 24, 48, and 72 h. The gene expression profile was then comprehensively analyzed by clustering, Gene Ontology (GO), Gene Microarray Pathway Profiler (GenMAPP) and Ingenuity Pathway Analysis (IPA). According to the results of microarray experiment, 8992 differentially expressed genes were obtained. 90 differential expressed genes related to HA osteogenic differentiation were determined by GO analysis. These genes included not only 6 genes related to HA osteogenic differentiation as mentioned in the literatures but also newly discovered 84 genes. Some important signaling pathways (TGF-β, MAPK, Wnt, etc.) were influenced by these genes. Gene interaction networks were obtained by IPA software, in which the scoring values of two networks were highest, and their main functions were related to cell development. The comprehensive analysis of these results indicate that NHA regulate some crucial genes (e.g., Bmp2, Spp1) and then activate some pathways such as TGF-β signaling pathway, and ultimately osteogenic differentiation was induced.
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Affiliation(s)
- Xiaoying Lü
- State Key Laboratory of Bioelectronics, School of Biological Science & Medical Engineering, Southeast University, Nanjing, Jiangsu, 210096, People's Republic of China
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Yang D, Lü X, Hong Y, Xi T, Zhang D. The molecular mechanism of mediation of adsorbed serum proteins to endothelial cells adhesion and growth on biomaterials. Biomaterials 2013; 34:5747-58. [DOI: 10.1016/j.biomaterials.2013.04.028] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 04/13/2013] [Indexed: 12/17/2022]
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Zhang X, Lü X, Yang X. Doughnut-shaped manifestation of pulmonary adenocarcinoma. QJM 2013; 106:277-8. [PMID: 22267577 DOI: 10.1093/qjmed/hcs002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- X Zhang
- Center of Infectious Diseases, West China Hospital, Sichuan University, Chengdu, China.
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Wang ZG, Lü X, Xia Y, Li W, Huang Z, Zhou Y, Shen X, Zhao X, Yang J, Wang S, Ma M, Wang B. Motor function rebuilding of limbs based on communication principle and electronic system. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2012:843-6. [PMID: 23366024 DOI: 10.1109/embc.2012.6346063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this paper, we report our novel idea on the function rebuilding for hemiplegic limbs and the primary experiments. The main concept is to connect the control-lost nerves or neuromuscular junctions by using a multi-channel micro- electronic neural bridge (MENB), regenerate the nervous signal, and rebuild the motor functions of the related limb. Since the injured nervous system in stroke-related hemiplegia is located in the brain and difficult to be identified and operate on, we use another nervous system functioning as a new signal source to supply similar neural signals. In these cases, that means, two independent nervous systems are connected by a MENB. As preclinical experiments, we have made a series of tests on bodies of animals and healthy human. The principle, the system construction and the experimental results will be given.
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Affiliation(s)
- Zhi-Gong Wang
- Institute of RF- & OE-ICs, Southeast University, 210096 Nanjing, China.
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Qu Y, Huang Y, Lü X. Proteomic Analysis of Molecular Biocompatibility of Gold Nanoparticles to Human Dermal Fibroblasts-Fetal. J Biomed Nanotechnol 2013; 9:40-52. [DOI: 10.1166/jbn.2013.1428] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [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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Wienold M, Tahraoui A, Schrottke L, Sharma R, Lü X, Biermann K, Hey R, Grahn HT. Lateral distributed-feedback gratings for single-mode, high-power terahertz quantum-cascade lasers. Opt Express 2012; 20:11207-11217. [PMID: 22565743 DOI: 10.1364/oe.20.011207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report on terahertz quantum-cascade lasers (THz QCLs) based on first-order lateral distributed-feedback (lDFB) gratings, which exhibit continuous-wave operation, high output powers (>8 mW), and single-mode emission at 3.3-3.4 THz. A general method is presented to determine the coupling coefficients of lateral gratings in terms of the coupled-mode theory, which demonstrates that large coupling strengths are obtained in the presence of corrugated metal layers. The experimental spectra are in agreement with simulations of the lDFB cavities, which take into account the reflective end facets.
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Affiliation(s)
- M Wienold
- Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany.
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Li W, Pei F, Wang Z, Lü X. Animal experiments with the microelectronics neural bridge IC. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2012:823-826. [PMID: 23366019 DOI: 10.1109/embc.2012.6346058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The combination of the neural science and the microelectronics science offers a new way to restore the function of central nervous system. A neural regeneration module is used to be implanted into body to bridge the damaged nerve. A microelectronics neural bridge IC designed in CSMC 0.5□m CMOS process which can detect the neural signal and stimulate the nerve is presented. The neural regeneration module is composed of the microelectronics neural bridge IC and some discrete devices. An animal experiment has been done to check whether the neural signal can be transmitted with the chip normally or not. The animal experiment results suggest that the neural regeneration module can make the neural signal transmit normally.
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Affiliation(s)
- Wenyuan Li
- Institute of RF- & OEICs, Southeast University, 210096 Nanjing, China.
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Cui Y, Zhao Y, Tian Y, Zhang W, Lü X, Jiang X. The molecular mechanism of action of bactericidal gold nanoparticles on Escherichia coli. Biomaterials 2011; 33:2327-33. [PMID: 22182745 DOI: 10.1016/j.biomaterials.2011.11.057] [Citation(s) in RCA: 422] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Accepted: 11/22/2011] [Indexed: 11/17/2022]
Abstract
This work examines the molecular mechanism of action of a class of bactericidal gold nanoparticles (NPs) which show potent antibacterial activities against multidrug-resistant Gram-negative bacteria by transcriptomic and proteomic approaches. Gold NPs exert their antibacterial activities mainly by two ways: one is to collapse membrane potential, inhibiting ATPase activities to decrease the ATP level; the other is to inhibit the subunit of ribosome from binding tRNA. Gold NPs enhance chemotaxis in the early-phase reaction. The action of gold NPs did not include reactive oxygen species (ROS)-related mechanism, the cause for cellular death induced by most bactericidal antibiotics and nanomaterials. Our investigation would allow the development of antibacterial agents that target the energy-metabolism and transcription of bacteria without triggering the ROS reaction, which may be at the same time harmful for the host when killing bacteria.
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Affiliation(s)
- Yan Cui
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, 2 Si Pailou, Nanjing 210096, China
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Huang Y, Lü X, Qian W, Tang Z, Zhong Y. Competitive protein adsorption on biomaterial surface studied with reflectometric interference spectroscopy. Acta Biomater 2010; 6:2083-90. [PMID: 20026435 DOI: 10.1016/j.actbio.2009.12.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 12/10/2009] [Accepted: 12/15/2009] [Indexed: 11/18/2022]
Abstract
Reflectometry interference spectroscopy (RIfS) is known as a highly sensitive and robust technique for direct, label-free detection of the interaction of biomacromolecules in real time and in situ. The aim of the present study was to investigate the competitive protein adsorption on the surface of fluorocarbon end-capped poly(carbonate) urethane (PCUF) and polystyrene (PS) based on the RIfS method. The surface energy and microstructures of PCUF and PS were characterized by contact angle measurement and atomic force microscopy. Interfacial energies between these surfaces and the proteins were then calculated. The protein adsorption experiments were carried out with both single solution and ternary solutions composed of albumin, fibrinogen and immunoglobulin-G (IgG). The results of surface characterization showed that PCUF was more hydrophilic than PS with a smaller surface energy, and micro-phases separation of PCUF was observed. RIfS analysis results revealed that more albumins, less fibrinogen and IgG were detected on the PCUF surface compared with PS after simplex and competitive protein adsorption, which indicated that PCUF had a preferential adsorption for albumin. The special morphology, smaller surface energy and calculated interfacial energies between PCUF and proteins may be responsible for the better blood compatibility of PCUF compared to PS. The results suggest that RIfS could serve as a novel, effective method for studying the competitive protein adsorption on biomaterial surfaces.
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Affiliation(s)
- Yan Huang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
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Yang Y, Qu Y, Lü X. Global Gene Expression Analysis of the Effects of Gold Nanoparticles on Human Dermal Fibroblasts. J Biomed Nanotechnol 2010; 6:234-46. [DOI: 10.1166/jbn.2010.1128] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [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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Shen X, Wang Z, Lü X, Jiang Z, Li W, Zhao X, Huang Z. Neural signal sensing, transmission and functional regeneration on different toads' bodies. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2009:5953-6. [PMID: 19965066 DOI: 10.1109/iembs.2009.5334775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The presence of neural signals is the most important feature of animals' life. Monitoring, analysis and regeneration of neural signals are important for the rehabilitation of paralyzed patients. In this paper, the neural signal regeneration between the proximal and the distal end of an injured nerve is introduced. In the experiment a microelectronic module is used as a channel bridge. The regeneration of nerve signals is realized from one toad's sciatic nerve to another's. Corresponding neural signals and EMG were recorded and analyzed. It will be a reference to further study on the neural signals and the relationship between a neural signal and the muscle locomotion.
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Affiliation(s)
- Xiaoyan Shen
- Institute of RF- & OE-ICs, Southeast University, Nanjing, P. R. China.
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Zhao Y, Lü X, Wang Z, Huang Y, Jiang Z, Li X. Study of the adhesion improvement in hippocampal cells on collagen/chitosan- modified silicon surfaces. Biomed Mater 2009; 4:065004. [DOI: 10.1088/1748-6041/4/6/065004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Su M, Dai M, Lü X, Li H, Liu J. [Effect of traditional Chinese medicine compounds Aining on the expression of apoptosis inducing genes of human gastric cancer cell]. Zhong Yao Cai 2002; 25:563-6. [PMID: 12599692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
OBJECTIVE To investigate the effects of Aining on the genes of the human gastric cancer cells. METHODS Flow cytometry(FMC) was adopted to detect the gene expression of the gastric cancer cell in the Aining group, the cisplatin(DDP) group and the blank group. RESULTS Compared with the blank group, the expression of c-myc and bcl-2 genes was low, while that of the p53, bax genes was high(P < 0.01), and the ratio of bax/bcl-2 significantly increased in both the Aining group and the cisplatin(DDP) group. CONCLUSIONS The mechanism of inducing the human gastric cancer cells apoptosis by Aining has some relationship with the changes of the genes.
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Affiliation(s)
- Miancheng Su
- National Engineering Research Center for Mordernization of TCM, Zhuhai 519020
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Su M, Dai M, Lü X, Li H, Liu J. [Morphological changes and inhibiting effect on human gastric cancer cell SGC-7901 caused by aining]. Zhong Yao Cai 2002; 25:339-42. [PMID: 12583192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the inhibiting effect of Aining on the human gastric cancer cells. METHODS Morphological and MTT methods were adopted to explore the inhibiting effect of Aining and cisplatin (DDP) on the proliferation of SGC-7901 cancer cell. RESULTS Apoptotic morphological changes were seen after the cells cultured with Aining and DDP; inhibiting rate of 1 g/L Aining group was 51%, which had no significant differences with the inhibiting rate 53% of the 25 mg/L DDP group. But both the Aining and the DDP groups were significantly different from the blank group (P < 0.01). CONCLUSION Not only DDP but also Aining could inhibit the proliferation activity of the human gastric cancer cells, and the traditional Chinese medicine compound prescription Aining is very likely to become a new medicine which is utilized to inhibit cancer.
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Affiliation(s)
- Miancheng Su
- National Engineering Research Center for Mordernization of TCM, Zhuhai 519020
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Lü X, Zeng L, Cai Y, Li Y, Liu X. [The apoptosis of human gastric cancer cell induced by Acanthopanax giraldii Harms var Hispidus Hoo Polysaccharides in vitro]. Hua Xi Yi Ke Da Xue Xue Bao 2002; 33:265-6, 273. [PMID: 12575204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the effect of Acanthopanax Giraldii Harms Var Hispidus Hoo polysaccharides (AGP-I) on the human gastric cancer cell. METHODS DNA agarose gel electrophoresis and flow cytometry techniques were adopted. RESULTS After treatment with AGP-I, apoptotic peaks in cell cycle analysis and DNA ladder on the agarose gel were observed. CONCLUSION The results indicate that AGP-1 may inhibit cancer by inducing cancer cell apoptosis.
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Affiliation(s)
- Xiaoying Lü
- Department of Nutrition and Food Hygiene, West China School of Public Health, Sichuan University, Chengdu 610041, China
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Su M, Dai M, Lü X, Liu J, Li H. [Apoptotic morphological changes and TUNEL of human gastric cancer cell SGC-7901 induced by aining]. Zhong Yao Cai 2002; 25:270-2. [PMID: 12583179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the inducing apoptosis effect of Aining on the human gastric cancer cell SGC-7901. METHODS In vitro cell culture was adopted to explore the inducing apoptosis effect of Aining and cisplation (DDP) through the morphological method and the molecular method. RESULTS Apoptotic morphological changes were seen after the cells cultured with Aining or DDP; apoptosis rate of 1 g/L Aining group was 46.36%, which had no significant differences with the apoptosis rate 49.12% of the 25 mg/L DDP group; both of the Aining and the DDP groups were significantly different from that of the blank group(P < 0.01). CONCLUSIONS Both DDP and Aining could induce the apoptosis of human gastric cancer cell and the traditional medicine compound prescription Aining is likely to become a new agent which is used to induce apoptosis of cancer cells.
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Affiliation(s)
- Miancheng Su
- National Engineering Research Center for Mordernization of TCM, Zhuhai 519020
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Lu P, Lü X, Xing RY, Sun QY, Han L, Wu SH, Lan H, Zheng XF. Genotype and allele frequency of the 27-bp tandem repeat polymorphism in the endothelial nitric oxide synthase gene in Chinese population. Yi Chuan Xue Bao 2002; 28:1093-7. [PMID: 11797337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Genotype and allele frequency of the polymorphic 27-bp repeat, a variable number of tandem repeats (VNTR) located in intron 4 of the endothelial nitric oxide synthase gene, were analyzed in 316 healthy Chinese individuals. Four genotypes, namely 6/5-repeats heterozygous, 5/5-repeats homozygous, 5/4-repeats heterozygous and 4/4-repeats homozygous, were identified. Both observed genotype and allele frequencies of this VNTR in Chinese were similar to those of Japanese, while the 4/4-repeats genotype differed significantly from that of Caucasians in Spain, and all ones did from those of African-American in United States.
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Affiliation(s)
- P Lu
- Department of Biochemistry & Molecular Biology, Institute of Radiation Medicine, Military Medical College, Beijing, China
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