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Liu T, Hou K, Li J, Han T, Liu S, Wei J. Alzheimer's Disease and Aging Association: Identification and Validation of Related Genes. J Prev Alzheimers Dis 2024; 11:196-213. [PMID: 38230733 DOI: 10.14283/jpad.2023.101] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
BACKGROUND Aging is considered a key risk factor for Alzheimer's disease (AD). This study aimed to identify and validate potential aging-related genes associated with AD using bioinformatics analysis. METHODS Datasets GSE36980 and GSE5281 were selected to screen differentially expressed genes (DEGs), and the immune cell correlation analysis and GSEA analysis of DEGs were performed. The intersection with senescence genes was taken as differentially expressed senescence-related genes (DESRGs), and the GSE44770 dataset was used for further validation. The potential biological functions and signaling pathways were determined by GO and KEGG, and the hub genes were identified by 12 algorithms in Cytohubba. The expression of 10 hub genes in different brain regions was determined and single-cell sequencing analysis was performed, and diagnostic genes were further screened by gene expression and receiver operating characteristic (ROC) curve. Finally, a miRNA-gene network of diagnostic genes was constructed and targeted drug prediction was performed. RESULTS A total of 2137 DEGs were screened from the GSE36980 and GSE5281 datasets, and 278 SRGs were identified from the CellAge database. The overlapping DEGs and SRGs constituted 29 DESRGs, including 14 senescence suppressor genes and 15 senescence inducible genes. The top 10 hub genes, including MDH1, CKB, PSMD14, SMARCA4, PEBP1, DDB2, ITPKB, ATF7IP, YAP1, and EWSR1 were screened. Furthermore, four diagnostic genes were identified: PMSD14, PEBP1, ITPKB, and ATF7IP. The ROC analysis showed that the respective area under the curves (AUCs) of PMSD14, PEBP1, ITPKB, and ATF7IP were 0.732, 0.701, 0.747, and 0.703 in the GSE36980 dataset and 0.870, 0.817, 0.902, and 0.834 in the GSE5281 dataset. In the GSE44770 dataset, PMSD14 (AUC, 0.838) and ITPKB (AUC, 0.952) had very high diagnostic values in the early stage of AD. Finally, based on these diagnostic genes, we found that the drug Abemaciclib is a targeted drug for the treatment of age-related AD. Flutamide can aggravate aging-related AD. CONCLUSION The results of this study suggest that cellular SRGs might play an important role in AD. PMSD14, PEBP1, ITPKB, and ATF7IP have the potential as specific biomarkers for the early diagnosis of AD.
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Affiliation(s)
- T Liu
- Professor Jianshe Wei, M.D., Ph.D., Institute for Brain Sciences Research, School of Life Sciences, Henan University, Kaifeng 475004, China
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Li B, Wang F, Wang N, Hou K, Du J. Identification of Implications of Angiogenesis and m6A Modification on Immunosuppression and Therapeutic Sensitivity in Low-Grade Glioma by Network Computational Analysis of Subtypes and Signatures. Front Immunol 2022; 13:871564. [PMID: 35572524 PMCID: PMC9094412 DOI: 10.3389/fimmu.2022.871564] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 03/28/2022] [Indexed: 02/06/2023] Open
Abstract
Angiogenesis is a complex process in the immunosuppressed low-grade gliomas (LGG) microenvironment and is regulated by multiple factors. N6-methyladenosine (m6A), modified by the m6A modification regulators (“writers” “readers” and “erasers”), can drive LGG formation. In the hypoxic environment of intracranial tumor immune microenvironment (TIME), m6A modifications in glioma stem cells are predominantly distributed around neovascularization and synergize with complex perivascular pathological ecology to mediate the immunosuppressive phenotype of TIME. The exact mechanism of this phenomenon remains unknown. Herein, we elucidated the relevance of the angiogenesis-related genes (ARGs) and m6A regulators (MAGs) and their influencing mechanism from a macro perspective. Based on the expression pattern of MAGs, we divided patients with LGG into two robust categories via consensus clustering, and further annotated the malignant related mechanisms and corresponding targeted agents. The two subgroups (CL1, CL2) demonstrated a significant correlation with prognosis and clinical-pathology features. Moreover, WGCNA has also uncovered the hub genes and related mechanisms of MAGs affecting clinical characters. Clustering analysis revealed a synergistic promoting effect of M6A and angiogenesis on immunosuppression. Based on the expression patterns of MAGs, we established a high-performance gene-signature (MASig). MASig revealed somatic mutational mechanisms by which MAGs affect the sensitivity to treatment in LGG patients. In conclusion, the MAGs were critical participants in the malignant process of LGG, with a vital potential in the prognosis stratification, prediction of outcome, and therapeutic sensitivity of LGG. Findings based on these strategies may facilitate the development of objective diagnosis and treatment systems to quantify patient survival and other outcomes, and in some cases, to identify potential unexplored targeted therapies.
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Affiliation(s)
- Bo Li
- Department of Neurosurgery, Huangyan Hospital, Wenzhou Medical University, Taizhou, China.,Department of Neurosurgery, Taizhou First People's Hospital, Taizhou, China
| | - Fang Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Nan Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Kuiyuan Hou
- Department of Neurosurgery, The First Hospital of Qiqihar City, Qiqihar, China
| | - Jianyang Du
- Department of Neurosurgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
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Ji H, Ba Y, Ma S, Hou K, Mi S, Gao X, Jin J, Gong Q, Liu T, Wang F, Liu Z, Li S, Du J, Hu S. Construction of Interferon-Gamma-Related Gene Signature to Characterize the Immune-Inflamed Phenotype of Glioblastoma and Predict Prognosis, Efficacy of Immunotherapy and Radiotherapy. Front Immunol 2021; 12:729359. [PMID: 34566988 PMCID: PMC8461254 DOI: 10.3389/fimmu.2021.729359] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 06/23/2021] [Accepted: 08/24/2021] [Indexed: 12/13/2022] Open
Abstract
Interferon-gamma (IFNG) has profound impacts on tumor-immune interaction and is of great clinical significance for multiple cancers. Exploring the role of IFNG in glioblastoma (GBM) may optimize the current treatment paradigm of this disease. Here, multi-dimensional data of 429 GBM samples were collected. Various bioinformatics algorithms were employed to establish a gene signature that characterizes immunological features, genomic alterations, and clinical characteristics associated with the IFNG response. In this way, a novel IFNG-related gene signature (IFNGrGS, including TGFBI, IL4I1, ACP5, and LUM) has been constructed and validated. Samples with increased IFNGrGS scores were characterized by increased neutrophil and macrophage infiltration and exuberant innate immune responses, while the activated adaptive immune response may be frustrated by multiple immunosuppressive mechanisms. Notably, the IFNG pathway as well as its antagonistic pathways including IL4, IL10, TGF-beta, and VEGF converged on the expression of immune checkpoints. Besides, gene mutations involved in the microenvironment were associated with the IFNGrGS-based stratification, where the heterogeneous prognostic significance of EGFR mutation may be related to the different degrees of IFNG response. Moreover, the IFNGrGS score had solid prognostic value and the potential to screen ICB and radiotherapy sensitive populations. Collectively, our study provided insights into the role of IFNG on the GBM immune microenvironment and offered feasible information for optimizing the treatment of GBM.
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Affiliation(s)
- Hang Ji
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Yixu Ba
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shuai Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Kuiyuan Hou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shan Mi
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Xin Gao
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jiaqi Jin
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,The Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin, China
| | - Qin Gong
- School of Life Sciences, Nanjing University, Nanjing, China
| | - Ting Liu
- Faculty of Pharmacy, Harbin Medical University (DAQING), Daqing, China
| | - Fang Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,The Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin, China
| | - Zhihui Liu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,The Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin, China
| | - Shupeng Li
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jianyang Du
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Department of Neurosurgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Shaoshan Hu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Department of Neurosurgery, Emergency Medicine Center, Zhejiang Provincial People's Hospital Affiliated to Hangzhou Medical College, Hangzhou, China
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Hou K, Liu J, Du J, Mi S, Ma S, Ba Y, Ji H, Li B, Hu S. Dihydroartemisinin prompts amplification of photodynamic therapy-induced reactive oxygen species to exhaust Na/H exchanger 1-mediated glioma cells invasion and migration. J Photochem Photobiol B 2021; 219:112192. [PMID: 34000476 DOI: 10.1016/j.jphotobiol.2021.112192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 12/16/2020] [Revised: 03/29/2021] [Accepted: 04/13/2021] [Indexed: 12/12/2022]
Abstract
Photodynamic therapy (PDT) is a promising glioma therapy; however, its efficacy is compromised due to the PDT-induced reactive oxygen species (ROS) production being limited by the local hypoxic tumor microenvironment. Furthermore, Hypoxia activates sodium/hydrogen exchanger 1 (NHE1), an essential component for tumor progression and metastasis, enables glioma cells (GC) to escape PDT-mediated phototoxicity via increased H+ extrusion. However, interactions between NHE1 expression with ROS level involving response of GC remain unclear. Dihydroartemisinin (DHA), a ROS generator, has extensive anti-tumor effects. This study aimed to explore whether PDT along with DHA could amplify the total ROS levels and diminish GC invasion and migration by inhibiting NHE1 expression. Proliferation and invasion of U251 and LN229 cells were evaluated under different treatments using cell counting Kit-8 (CCK-8), transwell, and wound healing assays. ROS levels were measured using fluorescence probes and flow cytometry. NHE1 levels were detected by immunofluorescence and western blotting. Co-treatment effects and molecular events were further confirmed in a bilateral tumor-bearing nude mouse model. PDT with synergistic DHA significantly increased the total abundance of ROS to further suppress the invasion and migration of GC by reducing NHE1 levels in vitro. Using a bilateral glioma xenograft mouse model with primary and recurrent gliomas, we found that PDT markedly suppressed primary tumor growth, while PDT in synergy with DHA also suppressed recurrent tumors, and improved overall survival by regulating the ROS-NHE1 axis. No evident side effects were observed. Our results suggest that PDT with DHA can amplify the total ROS levels to weaken GC invasion and migration by suppressing NHE1 expression in vitro and in vivo, thus abolishing the resistance of GC to PDT. The synergistic therapy of PDT and DHA therefore represents a more efficient and safe strategy for comprehensive glioma treatment.
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Affiliation(s)
- Kuiyuan Hou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Jie Liu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Jianyang Du
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Shan Mi
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Shuai Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Yixu Ba
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Hang Ji
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Bo Li
- Department of Neurosurgery, The First People's Hospital of Taizhou, Taizhou 318020, China
| | - Shaoshan Hu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
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Du J, Ji H, Ma S, Jin J, Mi S, Hou K, Dong J, Wang F, Zhang C, Li Y, Hu S. m6A regulator-mediated methylation modification patterns and characteristics of immunity and stemness in low-grade glioma. Brief Bioinform 2021; 22:6135369. [PMID: 33594424 DOI: 10.1093/bib/bbab013] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 12/14/2022] Open
Abstract
m6A RNA methylation is an emerging epigenetic modification, and its potential role in immunity and stemness remains unknown. Based on 17 widely recognized m6A regulators, the m6A modification patterns and corresponding characteristics of immune infiltration and stemness of 1152 low-grade glioma samples were comprehensively analyzed. Machine-learning strategies for constructing m6AScores were trained to quantify the m6A modification patterns of individual samples. Here, we reveal a significant correlation between the multi-omics data of regulators and clinicopathological parameters. We identified two distinct m6A modification patterns (an immune-activated differentiation pattern and an immune-desert dedifferentiation pattern) and four regulatory patterns of m6A methylation on immunity and stemness. We show that the m6AScores can predict the molecular subtype of low-grade glioma, the abundance of immune infiltration, the enrichment of signaling pathways, gene variation and prognosis. The concentration of high immunogenicity and clinical benefits in the low-m6AScore group confirmed the sensitive response to radio-chemotherapy and immunotherapy in patients with high-m6AScore. The results of the pan-cancer analyses illustrate the significant correlation between m6AScore and clinical outcome, the burden of neoepitope, immune infiltration and stemness. The assessment of individual tumor m6A modification patterns will guide us in improving treatment strategies and developing objective diagnostic tools.
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Affiliation(s)
- Jianyang Du
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Hang Ji
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Shuai Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Jiaqi Jin
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Shan Mi
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Kuiyuan Hou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Jiawei Dong
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Fang Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
- Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin 150081, China
| | - Chaochao Zhang
- Department of Neurosurgery, First Hospital of Jilin University, Changchun 130000, China
| | - Yuan Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250012, China
| | - Shaoshan Hu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
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Du J, Yan X, Mi S, Li Y, Ji H, Hou K, Ma S, Ba Y, Zhou P, Chen L, Xie R, Hu S. Identification of Prognostic Model and Biomarkers for Cancer Stem Cell Characteristics in Glioblastoma by Network Analysis of Multi-Omics Data and Stemness Indices. Front Cell Dev Biol 2020; 8:558961. [PMID: 33195193 PMCID: PMC7604309 DOI: 10.3389/fcell.2020.558961] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [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: 05/04/2020] [Accepted: 09/22/2020] [Indexed: 12/13/2022] Open
Abstract
The progression of most human cancers mainly involves the gradual accumulation of the loss of differentiated phenotypes and the sequential acquisition of progenitor and stem cell-like features. Glioblastoma multiforme (GBM) stem cells (GSCs), characterized by self-renewal and therapeutic resistance, play vital roles in GBM. However, a comprehensive understanding of GBM stemness remains elusive. Two stemness indices, mRNAsi and EREG-mRNAsi, were employed to comprehensively analyze GBM stemness. We observed that mRNAsi was significantly related to multi-omics parameters (such as mutant status, sample type, transcriptomics, and molecular subtype). Moreover, potential mechanisms and candidate compounds targeting the GBM stemness signature were illuminated. By combining weighted gene co-expression network analysis with differential analysis, we obtained 18 stemness-related genes, 10 of which were significantly related to survival. Moreover, we obtained a prediction model from both two independent cancer databases that was not only an independent clinical outcome predictor but could also accurately predict the clinical parameters of GBM. Survival analysis and experimental data confirmed that the five hub genes (CHI3L2, FSTL3, RPA3, RRM2, and YTHDF2) could be used as markers for poor prognosis of GBM. Mechanistically, the effect of inhibiting the proliferation of GSCs was attributed to the reduction of the ratio of CD133 and the suppression of the invasiveness of GSCs. The results based on an in vivo xenograft model are consistent with the finding that knockdown of the hub gene inhibits the growth of GSCs in vitro. Our approach could be applied to facilitate the development of objective diagnostic and targeted treatment tools to quantify cancer stemness in clinical tumors, and perhaps lead considerable benefits that could predict tumor prognosis, identify new stemness-related targets and targeted therapies, or improve targeted therapy sensitivity. The five genes identified in this study are expected to be the targets of GBM stem cell therapy.
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Affiliation(s)
- Jianyang Du
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Xiuwei Yan
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Shan Mi
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Yuan Li
- Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Hang Ji
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Kuiyuan Hou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shuai Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Yixu Ba
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Peng Zhou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Lei Chen
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Department of Neurosurgery, The First Affiliated Hospital of Harbin, Harbin, China
| | - Rui Xie
- Department of Digestive Internal Medicine, Harbin Medical University Cancer Hospital, Harbin, China
| | - Shaoshan Hu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
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Mi S, Du J, Liu J, Hou K, Ji H, Ma S, Ba Y, Chen L, Xie R, Hu S. FtMt promotes glioma tumorigenesis and angiogenesis via lncRNA SNHG1/miR-9-5p axis. Cell Signal 2020; 75:109749. [PMID: 32858123 DOI: 10.1016/j.cellsig.2020.109749] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 05/20/2020] [Revised: 08/08/2020] [Accepted: 08/19/2020] [Indexed: 12/15/2022]
Abstract
OBJECTIVE This study is to investigate the effects and the mechanisms of mitochondrial ferritin (FtMt) on the glioma tumorigenesis and angiogenesis. METHODS FtMt expression was detected in glioma tissues and cells as well as in nude mouse tissues. Cell proliferation and apoptosis rate were observed following transfection of LV-FtMt or sh-FtMt in glioma cell line. Moreover, glioma cells with FtMt over-expression/knockdown were co-cultured with human umbilical vein endothelial cells (HUVECs) to observe its function on HUVEC proliferation, angiogenic ability and the vascular endothelial growth factor (VEGF) content. Gain and loss of function of small nucleolar RNA host gene 1 (SNHG1) and miR-9-5p were performed in glioma cells and GBM nude mice to observe its effect on glioma cell proliferation and HUVEC angiogenic ability. Luciferase reporter gene and RIP assay were employed to inspect the interactions among SNHG1, FtMt and miR-9-5p. Additionally, a xenograft mouse model was applied to determine the role of FtMt in glioma. RESULTS In this work, FtMt was strongly expressed in glioma tissues and cells as well as in nude mouse tumor tissues. The employment of the loss-of and gain-of functions assays illustrated that FtMt enhanced glioma tumorigenesis and angiogenesis. Mechanistically, our findings showed that FtMt positively related to SNHG1 while negatively correlated with miR-9-5p, and both SNHG1 and FtMt can competitively bind with miR-9-5p. Besides, the inhibition effects of sh-FtMt on glioma were surveyed in vivo experiments. CONCLUSION Evidence in this study suggested that FtMt promotes glioma tumorigenesis and angiogenesis via SNHG1 mediated miR-9-5p expression, which may provide a theoretical basis for glioma treatment.
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Affiliation(s)
- Shan Mi
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Jianyang Du
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Jie Liu
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Kuiyuan Hou
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Hang Ji
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Shuai Ma
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Yixu Ba
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China; Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China
| | - Lei Chen
- Northern Translational Medical Research and Cooperation Center, Heilongjiang Academy of Medical University, Harbin, Heilongjiang 150081, China.
| | - Rui Xie
- Department of Digestive Internal Medicine, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, China.
| | - Shaoshan Hu
- Department of Neurosurgery, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China.
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Du J, Hou K, Mi S, Ji H, Ma S, Ba Y, Hu S, Xie R, Chen L. Malignant Evaluation and Clinical Prognostic Values of m6A RNA Methylation Regulators in Glioblastoma. Front Oncol 2020; 10:208. [PMID: 32211315 PMCID: PMC7075451 DOI: 10.3389/fonc.2020.00208] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [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: 12/10/2019] [Accepted: 02/06/2020] [Indexed: 12/18/2022] Open
Abstract
N6-methyladenosine (m6A) RNA methylation, the most common form of mRNA modification and regulated by the m6A RNA methylation regulators ("writers," "erasers," and "readers"), has been reported to be associated with the progression of the malignant tumor. However, its role in glioblastoma (GBM) has been poorly known. This study aimed to identify the expression, potential functions, and prognostic values of m6A RNA methylation regulators in GBM. Here, we revealed that the 13 central m6A RNA methylation regulators were firmly related to the clinical and molecular phenotype of GBM. Taking advantage of consensus cluster analysis, we obtained two categories of GBM samples and found malignancy-related processes of m6A methylation regulators and compounds that specifically targeted the malignant processes. Besides, we also obtained a list of genes with poor prognosis in GBM. Finally, we derived a risk-gene signature with three selected m6A RNA methylation regulators, which allowed us to extend the in-depth study and dichotomized the OS of patients with GBM into high- and low-risk subgroups. Notably, this risk-gene signature could be used as independent prognostic markers and accurate clinicopathological parameter predictors. In conclusion, m6A RNA methylation regulators are a type of vital participant in the malignant progression of GBM, with a critical potential in the prognostic stratification and treatment strategies of GBM.
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Affiliation(s)
- Jianyang Du
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Kuiyuan Hou
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shan Mi
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Hang Ji
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shuai Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Yixu Ba
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Shaoshan Hu
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Rui Xie
- Department of Digestive Internal Medicine, Harbin Medical University Cancer Hospital, Harbin, China
| | - Lei Chen
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Translational Medicine Research and Cooperation Center of Northern China, Heilongjiang Academy of Medical Sciences, Harbin, China
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9
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Liu J, Hou K, Ji H, Mi S, Yu G, Hu S, Wang J. Overexpression of circular RNA circ‐CDC45 facilitates glioma cell progression by sponging miR‐516b and miR‐527 and predicts an adverse prognosis. J Cell Biochem 2019; 121:690-697. [PMID: 31407396 DOI: 10.1002/jcb.29315] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 07/15/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Jie Liu
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Kuiyuan Hou
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Hang Ji
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Shan Mi
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Guangna Yu
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Shaoshan Hu
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
| | - Jianjiao Wang
- Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin China
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10
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CHe X, Zhang Y, Qu X, Guo T, Ma Y, Li C, Fan Y, Hou K, Cai Y, Yu R, Zhou H, He X, Wu H, Liu Y, Xu L. The E3 ubiquitin ligase Cbl-b inhibits tumor growth in multidrug-resistant gastric and breast cancer cells. Neoplasma 2019; 64:887-892. [PMID: 28895413 DOI: 10.4149/neo_2017_610] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Most receptor tyrosine kinases (RTKs) contribute to tumor growth, and their ubiquitination and degradation is related to the inhibition of tumor growth. Our previous study showed that the ubiquitin ligase Cbl-b was expressed at low levels in multidrug-resistant (MDR) gastric cancer cells compared with their parental cells. However, whether enhancement of Cbl-b expression in MDR cancer cells could prevent tumor proliferation via ubiquitination and degradation of RTK remains unclear. In the present study, Cbl-b overexpression reduced cell proliferation in MDR gastric and breast cancer cells, and effectively inhibited tumor growth in vivo. Additionally, Cbl-b overexpression reduced the total protein level of insulin-like growth factor 1 (IGF-1R), an important member of the RTK family. Moreover, Cbl-b overexpression promoted interaction of Cbl-b with IGF-1R, and induced ubiquitination and degradation of IGF-1R and inactivation of the IGF-1R pathway. These results suggest that the ubiquitin ligase Cbl-b inhibited tumor growth via ubiquitination and degradation of IGF-1R in MDR gastric and breast cancer cells.
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11
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Pan H, Palekar R, Hou K, Bacon J, Yan H, Springer L, Akk A, Pham C, Schlesinger P, Wickline S. P1273JNK-2 silencing with focally acting peptide-siRNA nanostructures modulates plaque inflammation in atherosclerotic mice. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Pan
- University of South Florida, The Heart Institute, Tampa, United States of America
| | - R Palekar
- Washington University School of Medicine, St. Louis, United States of America
| | - K Hou
- Washington University School of Medicine, St. Louis, United States of America
| | - J Bacon
- Washington University School of Medicine, St. Louis, United States of America
| | - H Yan
- Washington University School of Medicine, St. Louis, United States of America
| | - L Springer
- Washington University School of Medicine, St. Louis, United States of America
| | - A Akk
- Washington University School of Medicine, St. Louis, United States of America
| | - C Pham
- Washington University School of Medicine, St. Louis, United States of America
| | - P Schlesinger
- Washington University School of Medicine, St. Louis, United States of America
| | - S Wickline
- University of South Florida, The Heart Institute, Tampa, United States of America
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12
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Zhang S, Zhang Y, Qu J, Che X, Fan Y, Hou K, Guo T, Deng G, Song N, Li C, Wan X, Qu X, Liu Y. Exosomes promote cetuximab resistance via the PTEN/Akt pathway in colon cancer cells. ACTA ACUST UNITED AC 2017; 51:e6472. [PMID: 29160412 PMCID: PMC5685060 DOI: 10.1590/1414-431x20176472] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 09/05/2017] [Indexed: 12/11/2022]
Abstract
Cetuximab is widely used in patients with metastatic colon cancer expressing wildtype KRAS. However, acquired drug resistance limits its clinical efficacy. Exosomes are nanosized vesicles secreted by various cell types. Tumor cell-derived exosomes participate in many biological processes, including tumor invasion, metastasis, and drug resistance. In this study, exosomes derived from cetuximab-resistant RKO colon cancer cells induced cetuximab resistance in cetuximab-sensitive Caco-2 cells. Meanwhile, exosomes from RKO and Caco-2 cells showed different levels of phosphatase and tensin homolog (PTEN) and phosphor-Akt. Furthermore, reduced PTEN and increased phosphorylated Akt levels were found in Caco-2 cells after exposure to RKO cell-derived exosomes. Moreover, an Akt inhibitor prevented RKO cell-derived exosome-induced drug resistance in Caco-2 cells. These findings provide novel evidence that exosomes derived from cetuximab-resistant cells could induce cetuximab resistance in cetuximab-sensitive cells, by downregulating PTEN and increasing phosphorylated Akt levels.
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Affiliation(s)
- S Zhang
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Zhang
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - J Qu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Che
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Fan
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - K Hou
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - T Guo
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - G Deng
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - N Song
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - C Li
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Wan
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - X Qu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
| | - Y Liu
- Department of Medical Oncology, the First Hospital of China Medical University, Shenyang, China.,Key Laboratory of Anticancer Drugs and Biotherapy of Liaoning Province, the First Hospital of China Medical University, Shenyang, China
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13
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Liu RY, Hou K, Hou ZH, Yang SM. [Analysis of the diagnosis and treatment of cerebrospinal fluid otorrhea]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:627-629; 632. [PMID: 29871093 DOI: 10.13201/j.issn.1001-1781.2016.08.011] [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] [Received: 11/01/2015] [Indexed: 11/12/2022]
Abstract
Objective:To analyze the etiology and clinical symptoms and to investigate the therapeutic strategies of cerebrospinal fluid otorrhea. Method:A retrospective analysis of 37 cases of patients with cerebrospinal fluid otorrhea.The clinical symptoms, auxiliary examination, intraoperative findings, surgical methods and postoperative follow-up were analyzed. Result:In 37 cases, 35 patients underwent the plugging surgery once and cured, 1 patient with inner ear malformation underwent another operation and cured, 1 patient didn't have the operation. No cerebrospinal fluid leakage or meningitis recurrence was reported by the followed up from 1 months to 7 years after operation. Conclusion:Surgical repair is an effective method to treat the cerebrospinal fluid otorrhea. It is significant to take appropriate surgical approach to expose and to find the leak, according to the etiological factor and imaging examination.
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Affiliation(s)
- R Y Liu
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - K Hou
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - Z H Hou
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
| | - S M Yang
- Department of Otolaryngology Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, 100853, China
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14
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Guan LL, Wu W, Hu B, Li D, Chen JW, Hou K, Wang L. Devolopmental and growth temperature regulation of omega-3 fatty acid desaturase genes in safflower (Carthamus tinctorius L.). Genet Mol Res 2014; 13:6623-37. [PMID: 25177943 DOI: 10.4238/2014.august.28.7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Three ω-3 fatty acid desaturase genes (CtFAD3, CtFAD7, and CtFAD8) were isolated from safflower (Carthamus tinctorius L.). Transcript analysis showed that the highest transcript levels were detected for CtFAD3 and the low transcript levels were detected for CtFAD7 and CtFAD8 in flowers. This result indicates that CtFAD3 enzyme activity is important for fatty acid desaturation in flowers. The low transcript level of CtFAD3 in developing seeds was consistent with the recorded high level of linoleic acid (18:2) and lack of linolenic acid (18:3) in safflower seed oil. At low temperatures, the induced transcription levels of ω-3 fatty acid desaturase genes in the stems and petioles were consistent with increased polyunsaturated fatty acids (PUFAs). In the roots, ω-3 fatty acid desaturase noticeably increased at low temperatures, whereas PUFA levels decreased. Interestingly, C18:3(Δ9,12,15) alcohol was specifically found in safflower roots, and showed a significant increase, indicating a flux in the acid to alcohol ratio of this compound in safflower roots.
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Affiliation(s)
- L-L Guan
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of Agriculture, China
| | - W Wu
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - B Hu
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - D Li
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - J-W Chen
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - K Hou
- Agronomy College, Sichuan Agricutural University, Cheng Du, China
| | - L Wang
- Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of Agriculture, China
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Qu X, Zhang L, Teng Y, Zhang Y, Liu J, Xu L, Qu J, Hou K, Yang X, Liu Y. Prognostic value of expression of RANK and c-Src in patients with breast cancer with bone metastasis. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e21024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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16
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Iuchi H, Watanabe Y, Hashimoto H, Fijisawa M, Saga Y, Hou K, Tsurukawa H. UP-2.191: Urodynamic Evaluations of Silodosin, a Novel Selective α-1a Adrenoceptor Blocker, for Treatment of Benign Prostatic Hyperplasia. Urology 2009. [DOI: 10.1016/j.urology.2009.07.410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Hou K. Preparation of thin and highly stable Pd/Ag composite membranes and simulative analysis of transfer resistance for hydrogen separation. J Memb Sci 2003. [DOI: 10.1016/s0376-7388(02)00525-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Hou K, Hughes R. The effect of external mass transfer, competitive adsorption and coking on hydrogen permeation through thin Pd/Ag membranes. J Memb Sci 2002. [DOI: 10.1016/s0376-7388(01)00770-0] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Corrigendum to: “Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles”. Chem Eng Sci 2002. [DOI: 10.1016/s0009-2509(02)00151-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Hou K, Hughes R, Ramos R, Menéndez M, Santamarı́a J. Simulation of a membrane reactor for oxidative dehydrogenation of propane, incorporating radial concentration and temperature profiles. Chem Eng Sci 2001. [DOI: 10.1016/s0009-2509(00)00422-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Hou K, Fowles M, Hughes R. Potential catalyst deactivation due to hydrogen removal in a membrane reactor used for methane steam reforming. Chem Eng Sci 1999. [DOI: 10.1016/s0009-2509(99)00085-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Hou K, Fowles M, Hughes R. Effective Diffusivity Measurements on Porous Catalyst Pellets at Elevated Temperature and Pressure. Chem Eng Res Des 1999. [DOI: 10.1205/026387699525873] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Abstract
The effects of positively charged nylon and depth (cellulose-diatomaceous earth) filters on endotoxin removal from various solutions were evaluated. The charged filter media removed significant amounts of Escherichia coli and natural endotoxin from tap water, distilled water, sugars, and NaCl solutions; no significant removal of endotoxin was observed with negatively charged filter media. The extent of removal was influenced by pH, the presence of salts, and organic matter. Such media may be useful for the control of endotoxins in raw-product water or solutions used to prepare parenteral drug products or in other fluids where endotoxin control is desired.
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Abstract
This report demonstrates how electropositive filters can be used to enhance the removal of microorganisms and other negatively charged particles from water. It was shown that electropositive depth filters were capable of adsorbing viruses and endotoxins many times smaller than the average pore size of the filter. Electronegative filters of similar porosity or electropositive filters that had been treated to destroy the positive charge were almost ineffective under similar conditions for the removal of viruses and small latex spheres. The results of this study indicate that electropositive filters are highly effective in the removal of a wide range of contaminants over a wide range of pH values and ionic conditions.
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