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Clearman KR, Timpratoom N, Patel D, Rains AB, Haycraft CJ, Croyle MJ, Reiter JF, Yoder BK. Rab35 Is Required for Embryonic Development and Kidney and Ureter Homeostasis through Regulation of Epithelial Cell Junctions. J Am Soc Nephrol 2024; 35:719-732. [PMID: 38530365 PMCID: PMC11164122 DOI: 10.1681/asn.0000000000000335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 03/12/2024] [Indexed: 03/28/2024] Open
Abstract
Key Points Loss of Rab35 leads to nonobstructive hydronephrosis because of loss of ureter epithelium. Rab35 regulates kidney and ureter epithelial cell adhesion and polarity. Rab35 is required for embryonic development. Background Rab35 is a member of a GTPase family of endocytic trafficking proteins. Studies in cell lines have indicated that Rab35 participates in cell adhesion, polarity, cytokinesis, and primary cilia length and composition. In addition, sea urchin Rab35 regulates actin organization and is required for gastrulation. In mice, loss of Rab35 in the central nervous system disrupts hippocampal development and neuronal organization. Outside of the central nervous system, the functions of mammalian Rab35 in vivo are unknown. Methods We generated and analyzed the consequences of both congenital and conditional null Rab35 mutations in mice. Using a LacZ reporter allele, we assessed Rab35 expression during development and postnatally. We assessed Rab35 loss in the kidney and ureter using histology, immunofluorescence microscopy, and western blotting. Results Congenital Rab35 loss of function caused embryonic lethality: homozygous mutants arrested at E7.5 with cardiac edema. Conditional loss of Rab35, either during gestation or postnatally, caused hydronephrosis. The kidney and ureter phenotype were associated with disrupted actin cytoskeletal architecture, altered Arf6 epithelial polarity, reduced adherens junctions, loss of tight junction formation, defects in epithelial growth factor receptor expression and localization, disrupted cell differentiation, and shortened primary cilia. Conclusions Rab35 may be essential for mammalian development and the maintenance of kidney and ureter architecture. Loss of Rab35 leads to nonobstructive hydronephrosis, making the Rab35 mutant mouse a novel mammalian model to study mechanisms underlying this disease.
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Affiliation(s)
- Kelsey R. Clearman
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Napassawon Timpratoom
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Dharti Patel
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Addison B. Rains
- Department of Craniofacial Biology, University of Colorado Anschutz Medical Campus, Denver, Colorado
| | - Courtney J. Haycraft
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Mandy J. Croyle
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Jeremy F. Reiter
- Department of Biochemistry and Biophysics, University of California at San Francisco, San Francisco, California
- Chan Zuckerberg Biohub, San Francisco, California
| | - Bradley K. Yoder
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama
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Lin S, Wei C, Wei Y, Fan J. Construction and verification of an endoplasmic reticulum stress-related prognostic model for endometrial cancer based on WGCNA and machine learning algorithms. Front Oncol 2024; 14:1362891. [PMID: 38725627 PMCID: PMC11079237 DOI: 10.3389/fonc.2024.1362891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 04/11/2024] [Indexed: 05/12/2024] Open
Abstract
Background Endoplasmic reticulum (ER) stress arises from the accumulation of misfolded or unfolded proteins within the cell and is intricately linked to the initiation and progression of various tumors and their therapeutic strategies. However, the precise role of ER stress in uterine corpus endometrial cancer (UCEC) remains unclear. Methods Data on patients with UCEC and control subjects were obtained from The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases. Using differential expression analysis and Weighted Gene Co-expression Network Analysis (WGCNA), we identified pivotal differentially expressed ER stress-related genes (DEERGs). Further validation of the significance of these genes in UCEC was achieved through consensus clustering and bioinformatic analyses. Using Cox regression analysis and several machine learning algorithms (least absolute shrinkage and selection operator [LASSO], eXtreme Gradient Boosting [XGBoost], support vector machine recursive feature elimination [SVM-RFE], and Random Forest), hub DEERGs associated with patient prognosis were effectively identified. Based on the four identified hub genes, a prognostic model and nomogram were constructed. Additionally, a drug sensitivity analysis and in vitro validation experiments were performed. Results A total of 94 DEERGs were identified in patients with UCEC and healthy controls. Consensus clustering analysis revealed significant differences in prognosis, typical immune checkpoints, and tumor microenvironments between the subtypes. Using Cox regression analysis and machine learning, four hub DEERGs, MYBL2, RADX, RUSC2, and CYP46A1, were identified to construct a prognostic model. The reliability of the model was validated using receiver operating characteristic (ROC) curves. Decision curve analysis (DCA) demonstrated the superior predictive ability of the nomogram in terms of 3- and 5-year survival, compared with that of other clinical indicators. Drug sensitivity analysis revealed increased sensitivity to dactinomycin, docetaxel, selumetinib, and trametinib in the low-risk group. The expressions of RADX, RUSC2, and CYP46A1 were downregulated, whereas that of MYBL2 was upregulated in UCEC tissues, as demonstrated by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and immunofluorescence assays. Conclusion This study developed a stable and accurate prognostic model based on multiple bioinformatics analyses, which can be used to assess the prognosis of UCEC. This model may contribute to future research on the risk stratification of patients with UCEC and the formulation of novel treatment strategies.
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Affiliation(s)
- Shanshan Lin
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Changqiang Wei
- Department of Prenatal Diagnosis, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Yiyun Wei
- Department of Prenatal Diagnosis, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Jiangtao Fan
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
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Clearman KR, Timpratoom N, Patel D, Rains AB, Haycraft CJ, Croyle MJ, Reiter JF, Yoder BK. Rab35 is required for embryonic development and kidney and ureter homeostasis through regulation of epithelial cell junctions. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.11.556924. [PMID: 37745459 PMCID: PMC10515836 DOI: 10.1101/2023.09.11.556924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Background Rab35 is a member of a GTPase family of endocytic trafficking proteins. Studies in cell lines have indicated that Rab35 participates in cell adhesion, polarity, cytokinesis, and primary cilia length and composition. Additionally, sea urchin Rab35 regulates actin organization and is required for gastrulation. In mice, loss of Rab35 in the CNS disrupts hippocampal development and neuronal organization. Outside of the CNS, the functions of mammalian Rab35 in vivo are unknown. Methods We generated and analyzed the consequences of both congenital and conditional null Rab35 mutations in mice. Using a LacZ reporter allele, we assessed Rab35 expression during development and postnatally. We assessed Rab35 loss in the kidney and ureter using histology, immunofluorescence microscopy, and western blotting. Results Congenital Rab35 loss of function caused embryonic lethality: homozygous mutants arrested at E7.5 with cardiac edema. Conditional loss of Rab35, either during gestation or postnatally, caused hydronephrosis. The kidney and ureter phenotype were associated with disrupted actin cytoskeletal architecture, altered Arf6 epithelial polarity, reduced adherens junctions, loss of tight junction formation, defects in EGFR expression and localization, disrupted cell differentiation, and shortened primary cilia. Conclusion Rab35 is essential for mammalian development and the maintenance of kidney and ureter architecture. Loss of Rab35 leads to non-obstructive hydronephrosis, making the Rab35 mutant mouse a novel mammalian model to study mechanisms underlying this disease.
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Affiliation(s)
- Kelsey R. Clearman
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Napassawon Timpratoom
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Dharti Patel
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Addison B. Rains
- Department of Craniofacial Biology at the University of Colorado Anschutz Medical Campus, Denver, Co, United States
| | - Courtney J. Haycraft
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Mandy J. Croyle
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Jeremy F. Reiter
- Department of Biochemistry and Biophysics, University of California at San Francisco, San Francisco, CA, United States
- Chan Zuckerberg Biohub, San Francisco, CA, United States
| | - Bradley K. Yoder
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States
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Liu L, Xu H, Shi Y, Cui J, Wu J, Li S. p53 regulates the effects of DAPT on Rac1 activation and migration of non-small-cell lung cancer cells. Heliyon 2023; 9:e14169. [PMID: 36923886 PMCID: PMC10009732 DOI: 10.1016/j.heliyon.2023.e14169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 02/21/2023] [Accepted: 02/23/2023] [Indexed: 03/06/2023] Open
Abstract
The use of γ-secretase inhibitors to inhibit the activation of Notch receptors can effectively inhibit the malignant process of tumors. Here, we demonstrate that p53 can modulate the effect of DAPT (a γ-secretase inhibitor) on the activation of small GTPase Rac1, thereby affecting cell migration of non-small-cell lung cancer H1299 and A549 cells. After treatment with 20 μM DAPT, activation of Rac1 was increased in H1299 cells but not in A549 cells. We further found that the migration ability of H1299 cells was increased, whereas that of A549 cells was reduced. The effect of DAPT on H1299 migration was repressed by Rac1-T17N, a dominant inactivated mutant of Rac1. H1299 is a p53-deficient cell line. When p53 protein was overexpressed in H1299 cells with a pEGFP-p53 plasmid, DAPT treatment no longer activated Rac1 and increased migration ability. Moreover, DAPT promoted the migration of H1299 cells by increasing the activity of Rac1 through the non-canonical Notch pathway. Taken together, these results indicate that the expression of p53 protein in lung cancer cells regulates the effect of DAPT on cell migration by modulating the activation of Rac1, suggesting that p53 may affect the therapeutic effects of Notch inhibitors in lung cancer patients.
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Affiliation(s)
- Lei Liu
- Department of Physiology, Xuzhou Medical University, No. 209 Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Hong Xu
- Emergency Center, Xuzhou Tongshan District People's Hospital, No. 267 Huaihai West Road, Xuzhou, Jiangsu, 221006, China
| | - Yue Shi
- Department of Physiology, Xuzhou Medical University, No. 209 Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Jie Cui
- Department of Physiology, Xuzhou Medical University, No. 209 Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Jinxia Wu
- Department of Physiology, Xuzhou Medical University, No. 209 Tongshan Road, Xuzhou, Jiangsu, 221004, China
| | - Shibao Li
- Department of Laboratory Medicine, The Affiliated Hospital of Xuzhou Medical University, No. 99 Huaihai West Road, Xuzhou, Jiangsu, 221000, China
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Yang Y, Gu X, Li Z, Zheng C, Wang Z, Zhou M, Chen Z, Li M, Li D, Xiang J. Whole-exome sequencing of rectal cancer identifies locally recurrent mutations in the Wnt pathway. Aging (Albany NY) 2021; 13:23262-23283. [PMID: 34642262 PMCID: PMC8544332 DOI: 10.18632/aging.203618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 09/29/2021] [Indexed: 12/29/2022]
Abstract
Locally recurrent rectal cancer (LRRC) leads to a poor prognosis and appears as a clinically predominant pattern of failure. In this research, whole-exome sequencing (WES) was performed on 21 samples from 8 patients to search for the molecular mechanisms of LRRC. The data was analyzed by bioinformatics. Gene Expression Profiling Interactive Analysis (GEPIA) and Human Protein Atlas (HPA) were performed to validate the candidate genes. Immunohistochemistry was used to detect the protein expression of LEF1 and CyclinD1 in LRRC, primary rectal cancer (PRC), and non-recurrent rectal cancer (NRRC) specimens. The results showed that LRRC, PRC, and NRRC had 668, 794, and 190 specific genes, respectively. FGFR1 and MYC have copy number variants (CNVs) in PRC and LRRC, respectively. LRRC specific genes were mainly enriched in positive regulation of transcription from RNA polymerase II promoter, plasma membrane, and ATP binding. The specific signaling pathways of LRRC were Wnt signaling pathway, gap junction, and glucagon signaling pathway, etc. The transcriptional and translational expression levels of genes including NFATC1, PRICKLE1, SOX17, and WNT6 related to Wnt signaling pathway were higher in rectal cancer (READ) tissues than normal rectal tissues. The PRICKLE1 mutation (c.C875T) and WNT6 mutation (c.G629A) were predicted as “D (deleterious)”. Expression levels of LEF1 and cytokinin D1 proteins: LRRC > PRC > NRRC > normal rectal tissue. Gene variants in the Wnt signaling pathway may be critical for the development of LRRC. The present study may provide a basis for the prediction of LRRC and the development of new therapeutic drugs.
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Affiliation(s)
- Yi Yang
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Xiaodong Gu
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Zhenyang Li
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Chuang Zheng
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Zihao Wang
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Minwei Zhou
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Zongyou Chen
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Mengzhen Li
- MyGene Diagnostics Co., Ltd, Guangzhou 510000, China
| | - Dongbing Li
- MyGene Diagnostics Co., Ltd, Guangzhou 510000, China
| | - Jianbin Xiang
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
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Wen H, Liu Z, Tang J, Bu L. MiR-185-5p targets RAB35 gene to regulate tumor cell-derived exosomes-mediated proliferation, migration and invasion of non-small cell lung cancer cells. Aging (Albany NY) 2021; 13:21435-21450. [PMID: 34500436 PMCID: PMC8457581 DOI: 10.18632/aging.203483] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 08/14/2021] [Indexed: 02/06/2023]
Abstract
Introduction: Non-small cell lung cancer (NSCLC) is the most common malignant tumor, and its recurrence and metastasis are the main causes of death. Recently, there is evidence that tumor derived exosomes play an important role in the occurrence and development of NSCLC. Objective’s methods: First, the expression of miR-185-5p and RAB35 in NSCLC tissues, paracancerous tissues, NSCLC cell lines and normal human bronchial epithelial cell line was detected. Then, a series of gain-and loss-of-function assays were performed to validate the effects of miR-185-5p or RAB35 effects on A549 and H2170 cells proliferation, migration and invasion. Next, online bioinformatics analysis and luciferase reporter were used to predict and validate the targeting relationship of miR-185-5p and RAB35. Finally, tumor cell-derived exosomes with genetic downregulation of RAB35 or overexpression of miR-185-5p were co cultured with their parental cells to verify the regulatory role of RAB35 on exosome secretion and function. Results: In NSCLC tissues and cell lines, miR-185-5p was downregulated, while RAB35 was significantly upregulated. Overexpression of miR-185-5p or knockdown of RAB35 expression inhibited cell proliferation, migration and invasion. Furthermore, we elucidated that RAB35 is a direct target of miR-185-5p. Additionally, exosomes derived from tumor cells restored cell proliferation, migration and invasion, whereas exosomes secreted by tumor cells with downregulation of RAB35 expression or overexpression of miR-185-5p lost their ability to restore cell proliferation, migration and invasion. Conclusions: Our results demonstrate that miR-185-5p inhibits tumor cell-derived exosomes-mediated proliferation, migration and invasion of NSCLC cells by downregulating RAB35 expression.
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Affiliation(s)
- Hongqing Wen
- Department of Respiratory and Critical Care Medicine, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an 710018, Shaanxi, P.R. China
| | - Zhiyan Liu
- Department of Respiratory and Critical Care Medicine, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an 710018, Shaanxi, P.R. China
| | - Jingjing Tang
- Department of Respiratory and Critical Care Medicine, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an 710018, Shaanxi, P.R. China
| | - Lina Bu
- Department of Respiratory and Critical Care Medicine, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an 710018, Shaanxi, P.R. China
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7
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Liu H, Zhou Y, Qiu H, Zhuang R, Han Y, Liu X, Qiu X, Wang Z, Xu L, Tan R, Hong W, Wang T. Rab26 suppresses migration and invasion of breast cancer cells through mediating autophagic degradation of phosphorylated Src. Cell Death Dis 2021; 12:284. [PMID: 33731709 PMCID: PMC7969620 DOI: 10.1038/s41419-021-03561-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/22/2021] [Accepted: 02/25/2021] [Indexed: 02/08/2023]
Abstract
Rab proteins play crucial roles in membrane trafficking. Some Rab proteins are implicated in cancer development through regulating protein sorting or degradation. In this study, we found that the expression of Rab26 is suppressed in the aggressive breast cancer cells as compared to the levels in non-invasive breast cancer cells. Over-expression of Rab26 inhibits cell migration and invasion, while Rab26 knockdown significantly promotes the migration and invasion of breast cancer cells. Rab26 reduces focal adhesion association of Src kinase and induces endosomal translocation of Src. Further experiments revealed that Rab26 mediates the autophagic degradation of phosphorylated Src through interacting with ATG16L1, consequently, resulting in the suppression of the migration and invasion ability of breast cancer cells.
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Affiliation(s)
- Huiying Liu
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Yuxia Zhou
- grid.413458.f0000 0000 9330 9891School of Basic Medical Sciences, Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, 550025 Guiyang, China
| | - Hantian Qiu
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Ruijuan Zhuang
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Yang Han
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Xiaoqing Liu
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Xi Qiu
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Ziyan Wang
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Liju Xu
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Ran Tan
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
| | - Wanjin Hong
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China ,grid.185448.40000 0004 0637 0221Institute of Molecular and Cell Biology, A STAR (Agency of ScienceTechnology and Research), 61 Biopolis Drive, Singapore, 138673 Singapore
| | - Tuanlao Wang
- grid.12955.3a0000 0001 2264 7233School of Pharmaceutical Sciences, State Key Laboratory of Cellular Stress Biology, Fujian Provincial Key Laboratory of Innovative Drug Target Research, Xiamen University, 361005 Fujian, China
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8
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Chen W, Yang J, Fang H, Li L, Sun J. Relevance Function of Linc-ROR in the Pathogenesis of Cancer. Front Cell Dev Biol 2020; 8:696. [PMID: 32850817 PMCID: PMC7432147 DOI: 10.3389/fcell.2020.00696] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 07/09/2020] [Indexed: 12/24/2022] Open
Abstract
Long non-coding RNAs (lncRNAs) are the key components of non-coding RNAs (ncRNAs) with a length of 200 nucleotides. They are transcribed from the so-called “dark matter” of the genome. Increasing evidence have shown that lncRNAs play an important role in the pathophysiology of human diseases, particularly in the development and progression of tumors. Linc-ROR, as a new intergenic non-protein coding RNA, has been considered to be a pivotal regulatory factor that affects the occurrence and development of human tumors, including breast cancer (BC), colorectal cancer (CRC), pancreatic cancer (PC), hepatocellular carcinoma (HCC), and so on. Dysregulation of Linc-ROR has been closely related to advanced clinicopathological factors predicting a poor prognosis. Because linc-ROR can regulate cell proliferation, apoptosis, migration, and invasion, it can thus be used as a potential biomarker for patients with tumors and has potential clinical significance as a therapeutic target. This article reviewed the role of linc-ROR in the development of tumors, its related molecular mechanisms, and clinical values.
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Affiliation(s)
- Wenjian Chen
- Anhui Provincial Children's Hospital, Affiliated to Anhui Medical University, Hefei, China
| | - Junfa Yang
- Key Laboratory of Anti-inflammatory and Immune Medicine, Ministry of Education, Institute of Clinical Pharmacology, Anhui Medical University, Hefei, China.,School of Pharmacy, Anhui Medical University, Hefei, China
| | - Hui Fang
- Department of Pharmacology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, China
| | - Lei Li
- The Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jun Sun
- Anhui Provincial Children's Hospital, Affiliated to Anhui Medical University, Hefei, China
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Tachie-Menson T, Gázquez-Gutiérrez A, Fulcher LJ, Macartney TJ, Wood NT, Varghese J, Gourlay R, Soares RF, Sapkota GP. Characterisation of the biochemical and cellular roles of native and pathogenic amelogenesis imperfecta mutants of FAM83H. Cell Signal 2020; 72:109632. [PMID: 32289446 PMCID: PMC7284315 DOI: 10.1016/j.cellsig.2020.109632] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 04/06/2020] [Accepted: 04/06/2020] [Indexed: 12/27/2022]
Abstract
The majority of mutations identified in patients with amelogenesis imperfecta have been mapped to FAM83H. As FAM83H expression is not limited to the enamel, how FAM83H contributes to amelogenesis is still largely unknown. We previously reported that members of the FAM83 family of proteins interact with and regulate the subcellular distribution of the promiscuous serine-threonine protein kinase CK1 family, through their shared N-terminal DUF1669 domains. FAM83H co-localises with CK1 isoforms to speckle-like structures in both the cytoplasm and nucleus. In this report, we show FAM83H, unlike other FAM83 proteins, interacts and colocalises with NCK1/2 tyrosine kinase adaptor proteins. This interaction is mediated by proline-rich motifs within the C-terminus of FAM83H, specifically interacting with the second and third SH3 domains of NCK1/2. Moreover, FAM83H pathogenic AI mutant proteins, which trigger C-terminal truncations of FAM83H, retain their interactions with CK1 isoforms but lose interaction with NCK1/2. These AI mutant FAM83H proteins acquire a nuclear localisation, and recruit CK1 isoforms to the nucleus where CK1 retains its kinase activity. As understanding the constituents of the FAM83H-localised speckles may hold the key to unravelling potential substrates of FAM83H-associated CK1 substrates, we employed a TurboID-based proximity labelling approach and uncovered several proteins including Iporin and BAG3 as potential constituents of the speckles.
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Affiliation(s)
- Theresa Tachie-Menson
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Ana Gázquez-Gutiérrez
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom; University of Seville, Av. Sanchez Pizjuan, s/n, 41009, Seville, Spain
| | - Luke J Fulcher
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Thomas J Macartney
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Nicola T Wood
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Joby Varghese
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Robert Gourlay
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Renata F Soares
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Gopal P Sapkota
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom.
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10
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Dai J, Wang Y, Gong J, Yao Y. Biointerface anisotropy modulates migration of breast cancer cell. Colloids Surf B Biointerfaces 2020; 190:110973. [PMID: 32199258 DOI: 10.1016/j.colsurfb.2020.110973] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/24/2020] [Accepted: 03/11/2020] [Indexed: 12/21/2022]
Abstract
Migration of cancer cell is a cyclic process, which involves dynamic interaction between extracellular biointerface and cellular responds. In tumors, collagen as extracellular matrix reorganizes biointerface from curl and isotropic fibers to straightened and anisotropic fibers during tumorigenesis, yet how cell migration respond to topography of biointerface is unknown. In this research, we introduced a facile fabrication method on nanofibers of varying topography, which was mimicking the alignment of extracellular nanofibers, to examine the change of cytoskeleton during cell migration. We took advantage of breast carcinoma cell line (MDA-MB-231) for time-lapse imaging analysis. We found that biointerface anisotropy modulated morphology of cell and mediated the pattern of migration. Morphologically, cells on anisotropic nanofiber showed extending spindle shape. The trajectories of migration templated the topographic pattern on biointerface. Besides, aligned nanofiber induced caterpillar-like model of migration through protrusion - retraction cycle, which was indicated by periodical variation of aspect ratio and velocity of cells. The biointerface anisotropy triggered vimentin filaments and microtubule networks preferentially oriented along the alignment of nanofibers. And the velocity of cell mobility by vimentin, β-catenin or CDC42 knockdown was significantly enhanced on aligned nanofibers. Thus, we implied that biointerface anisotropy modulated migration of breast cancer cell and it associated with reorganization of cytoskeleton filaments.
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Affiliation(s)
- Jing Dai
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai, 201210, China; Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Changning, Shanghai, 200050, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Shijingshan, Beijing, 100049, China
| | - Yiqun Wang
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai, 201210, China; Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Jinkang Gong
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai, 201210, China
| | - Yuan Yao
- School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Pudong, Shanghai, 201210, China.
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11
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Liu L, Zhang L, Zhao S, Zhao XY, Min PX, Ma YD, Wang YY, Chen Y, Tang SJ, Zhang YJ, Du J, Gu L. Non-canonical Notch Signaling Regulates Actin Remodeling in Cell Migration by Activating PI3K/AKT/Cdc42 Pathway. Front Pharmacol 2019; 10:370. [PMID: 31057403 PMCID: PMC6477508 DOI: 10.3389/fphar.2019.00370] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 03/26/2019] [Indexed: 12/31/2022] Open
Abstract
Tumor cell migration is a critical step in cancer metastasis. Over-activated Notch pathway can promote the migration of cancer cells, especially in the breast cancer. However, the underlying mechanism of non-canonical Notch signaling in modulating the migration has not yet been clearly characterized. Here we demonstrated that DAPT, a gamma secretase inhibitor, inhibited protrusion formation and cell motility, and then reduced the migration of triple-negative breast cancer cells, through increasing the activity of Cdc42 by non-canonical Notch pathway. Phosphorylation of AKT on S473 was surprisingly increased when Notch signaling was inhibited by DAPT. Inhibition of PI3K and AKT by LY294002 and MK2206, respectively, or knockdown of AKT expression by siRNA blocked DAPT-induced activation of Cdc42. Moreover, immunofluorescence staining further showed that DAPT treatment reduced the formation of lamellipodia and induced actin cytoskeleton remodeling. Taken together, these results indicated that DAPT inhibited Notch signaling and consequently activated PI3K/AKT/Cdc42 signaling by non-canonical pathway, facilitated the formation of filopodia and inhibited the assembly of lamellipodia, and finally resulted in the decrease of migration activity of breast cancer cells.
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Affiliation(s)
- Lei Liu
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Lin Zhang
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Shuo Zhao
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Xu-Yang Zhao
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Peng-Xiang Min
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Ya-Dong Ma
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yue-Yuan Wang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yan Chen
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Si-Jie Tang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yu-Jie Zhang
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Jun Du
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Luo Gu
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Physiology, Nanjing Medical University, Nanjing, China
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12
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Zhao S, Min P, Liu L, Zhang L, Zhang Y, Wang Y, Zhao X, Ma Y, Xie H, Zhu C, Jiang H, Du J, Gu L. NEDD9 Facilitates Hypoxia-Induced Gastric Cancer Cell Migration via MICAL1 Related Rac1 Activation. Front Pharmacol 2019; 10:291. [PMID: 31019460 PMCID: PMC6458266 DOI: 10.3389/fphar.2019.00291] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 03/11/2019] [Indexed: 12/28/2022] Open
Abstract
Aims and Hypothesis: NEDD9 is highly expressed in gastric cancer and has a significant involvement in its pathogenesis. However, the mechanism behind hypoxia-promoted cancer cell migration and its regulation because of NEDD9 is still unknown. The aim of this study is to investigate the involvement of NEDD9 in gastric cancer cell migration under hypoxia and explore the underlying potential molecular mechanisms.
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Affiliation(s)
- Shuo Zhao
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Pengxiang Min
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Lei Liu
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
| | - Lin Zhang
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
| | - Yujie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Yueyuan Wang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Xuyang Zhao
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
| | - Yadong Ma
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Hui Xie
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Department of Implantology, Changzhou Stomatological Hospital, Changzhou, China
| | - Chenchen Zhu
- School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Haonan Jiang
- School of Basic Medical Science, Nanjing Medical University, Nanjing, China
| | - Jun Du
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Luo Gu
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
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13
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Lin L, Shi Y, Wang M, Wang C, Zhu J, Zhang R. Rab35/ACAP2 and Rab35/RUSC2 Complex Structures Reveal Molecular Basis for Effector Recognition by Rab35 GTPase. Structure 2019; 27:729-740.e3. [PMID: 30905672 DOI: 10.1016/j.str.2019.02.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 01/03/2019] [Accepted: 02/24/2019] [Indexed: 11/16/2022]
Abstract
Rab35, a master regulator of membrane trafficking, regulates diverse cellular processes and is associated with various human diseases. Although a number of effectors have been identified, the molecular basis of Rab35-effector interactions remains unclear. Here, we provide the high-resolution crystal structures of Rab35 in complex with its two specific effectors ACAP2 and RUSC2, respectively. In the Rab35/ACAP2 complex structure, Rab35 binds to the terminal ankyrin repeat and a C-terminal extended α helix of ACAP2, revealing a previously uncharacterized binding mode both for Rabs and ankyrin repeats. In the Rab35/RUSC2 complex structure, Arg1015 of RUSC2 functions as a "pseudo-arginine finger" that stabilizes the GTP-bound Rab35, thus facilitating the assembly of Rab35/RUSC2 complex. The structural analysis allows us to design specific Rab35 mutants capable of eliminating Rab35/ACAP2 and Rab35/RUSC2 interactions, but not interfering with other effector bindings. The atomic structures also offer possible explanations to disease-associated mutants identified at the Rab35-effector interfaces.
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Affiliation(s)
- Lin Lin
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai Science Research Center, 333 Haike Road, Shanghai 201210, China
| | - Yingdong Shi
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Mengli Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Chao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Jinwei Zhu
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai Science Research Center, 333 Haike Road, Shanghai 201210, China.
| | - Rongguang Zhang
- State Key Laboratory of Molecular Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai Science Research Center, 333 Haike Road, Shanghai 201210, China.
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14
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He M, Huang L, Hou X, Zhong C, Bachir ZA, Lan M, Chen R, Gao F. Efficient ovalbumin delivery using a novel multifunctional micellar platform for targeted melanoma immunotherapy. Int J Pharm 2019; 560:1-10. [PMID: 30677484 DOI: 10.1016/j.ijpharm.2019.01.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 12/27/2018] [Accepted: 01/10/2019] [Indexed: 02/07/2023]
Abstract
Cancer immunotherapy is considered to be one of the alternatives to traditional chemotherapy. It's known that foreign antigen, such as ovalbumin (OVA), can label tumor cells, leading to neoantigen recognition by cytotoxic T lymphocytes. Herein, a novel multifunctional micelle coated with PEGylated hyaluronic acid (HA) was prepared through self-assembly and electrostatic interaction. The OVA-loaded micelle with uniform size (132.1 ± 0.2 nm in diameter) exhibited favorable stability and sustained release profiles. The HA-coated micelle could target CD44-overexpressed cells and enhance the cellular uptake of OVA by 11.9 fold compared to free OVA. In vitro studies revealed that the cationic polymer, polyethyleneimine, could facilitate endosomal escape of OVA to label a tumor cell. After treatment with the OVA-loaded micelle, tumor growth in mice was significantly inhibited by 70% compared to the group treated with free OVA. All these results suggest the potential application of the immunotherapeutic micellar platform for melanoma treatment.
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Affiliation(s)
- Muye He
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Lei Huang
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Xinyu Hou
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Chen Zhong
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Zaina Ait Bachir
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Minbo Lan
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China
| | - Rongjun Chen
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
| | - Feng Gao
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China; Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China; Shanghai Key Laboratory of New Drug Design, East China University of Science and Technology, Shanghai 200237, China.
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15
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Gamage TKJB, Schierding W, Hurley D, Tsai P, Ludgate JL, Bhoothpur C, Chamley LW, Weeks RJ, Macaulay EC, James JL. The role of DNA methylation in human trophoblast differentiation. Epigenetics 2018; 13:1154-1173. [PMID: 30475094 DOI: 10.1080/15592294.2018.1549462] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The placenta is a vital fetal exchange organ connecting mother and baby. Specialised placental epithelial cells, called trophoblasts, are essential for adequate placental function. Trophoblasts transform the maternal vasculature to allow efficient blood flow to the placenta and facilitate adequate nutrient uptake. Placental development is in part regulated by epigenetic mechanisms. However, our understanding of how DNA methylation contributes to human trophoblast differentiation is limited. To better understand how genome-wide methylation differences affect trophoblast differentiation, reduced representation bisulfite sequencing (RRBS) was conducted on four matched sets of trophoblasts; side-population trophoblasts (a candidate human trophoblast stem cell population), cytotrophoblasts (an intermediate progenitor population), and extravillous trophoblasts (EVT, a terminally differentiated population) each isolated from the same first trimester placenta. Each trophoblast population had a distinct methylome. In line with their close differentiation relationship, the methylation profile of side-population trophoblasts was most similar to cytotrophoblasts, whilst EVT had the most distinct methylome. In comparison to mature trophoblast populations, side-population trophoblasts exhibited differential methylation of genes and miRNAs involved in cell cycle regulation, differentiation, and regulation of pluripotency. A combined methylomic and transcriptomic approach was taken to better understand cytotrophoblast differentiation to EVT. This revealed methylation of 41 genes involved in epithelial to mesenchymal transition and metastatic cancer pathways, which likely contributes to the acquisition of an invasive EVT phenotype. However, the methylation status of a gene did not always predict gene expression. Therefore, while CpG methylation plays a role in trophoblast differentiation, it is likely not the only regulatory mechanism involved in this process.
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Affiliation(s)
- Teena K J B Gamage
- a Department of Obstetrics and Gynaecology , The University of Auckland , Auckland , New Zealand
| | - William Schierding
- a Department of Obstetrics and Gynaecology , The University of Auckland , Auckland , New Zealand
| | - Daniel Hurley
- b Systems Biology Laboratory, Melbourne School of Engineering , University of Melbourne , Melbourne , Australia
| | - Peter Tsai
- a Department of Obstetrics and Gynaecology , The University of Auckland , Auckland , New Zealand
| | - Jackie L Ludgate
- c Department of Pathology, Dunedin School of Medicine , University of Otago , Dunedin , New Zealand
| | | | - Lawrence W Chamley
- a Department of Obstetrics and Gynaecology , The University of Auckland , Auckland , New Zealand
| | - Robert J Weeks
- c Department of Pathology, Dunedin School of Medicine , University of Otago , Dunedin , New Zealand
| | - Erin C Macaulay
- c Department of Pathology, Dunedin School of Medicine , University of Otago , Dunedin , New Zealand
| | - Joanna L James
- a Department of Obstetrics and Gynaecology , The University of Auckland , Auckland , New Zealand
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16
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Ye B, Duan B, Deng W, Wang Y, Chen Y, Cui J, Sun S, Zhang Y, Du J, Gu L, Lin L, Tang Y. EGF Stimulates Rab35 Activation and Gastric Cancer Cell Migration by Regulating DENND1A-Grb2 Complex Formation. Front Pharmacol 2018; 9:1343. [PMID: 30524285 PMCID: PMC6261971 DOI: 10.3389/fphar.2018.01343] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Accepted: 10/31/2018] [Indexed: 12/23/2022] Open
Abstract
Aims: The aim of this study was to reveal the specific molecular mechanisms by which DENND1A accepts EGF signaling and activates Rab35 in gastric cancer. Methods: The expression of proteins related to DENND1A was examined by western blot analysis. Activation of Rab35 was assessed by GST-pulldown. The interaction of DENND1A and Grb2 was assessed by GST-pulldown and co-immunoprecipitation assays. The relationship between DENND1A and cell migration and invasion was detected using wound healing and transwell by gene overexpression and RNA interference. Results: EGF stimulation significantly promoted cell migration, whereas transfection with siRab35 partially inhibited EGF-promoted cell migration. DENND1A is also involved in these processes and active Rab35. Moreover, DENND1A binds to the N-terminal and C-terminal SH3 domains of Grb2 through PRD. Of special interest is the observation that EGFR can recruit Grb2-DENND1A complex under EGF stimulation. Further results reveal that the higher the expression of DENND1A, the shorter progression-free survival of gastric cancer patients. Conclusion: In summary, we confirmed that EGF-Grb2-DENND1A-Rab35 signaling pathway with the interaction of DENND1A and Grb2 as a regulatory center could regulate gastric cancer cell migration and invasion. Ultimately, the expression level of DENND1A predicts the survival status of gastric cancer patients and may become one of the important targets for the treatment of gastric cancer.
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Affiliation(s)
- Bixing Ye
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Biao Duan
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Wenjie Deng
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yueyuan Wang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yan Chen
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
| | - Jie Cui
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Department of Physiology, Xuzhou Medical University, Xuzhou, China
| | - Shixiu Sun
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yujie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Jun Du
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Luo Gu
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Lin Lin
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yurong Tang
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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17
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Chen Y, Zhang L, Liu L, Sun S, Zhao X, Wang Y, Zhang Y, Du J, Gu L. Rasip1 is a RUNX1 target gene and promotes migration of NSCLC cells. Cancer Manag Res 2018; 10:4537-4552. [PMID: 30349386 PMCID: PMC6190810 DOI: 10.2147/cmar.s168438] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background Runt-related transcription factor 1 (RUNX1), an essential regulator of hematopoiesis, is overexpressed in patients with nonsmall-cell lung cancer (NSCLC) and is correlated with enhanced metastatic ability. Ras-interacting protein 1 (Rasip1), a potential oncogene, is required for blood vessel formation, and recently, it has been shown that Rasip1 is widely expressed in NSCLC patients. We noticed that Rasip1 promoter contains several potential RUNX1-binding sequences. However, the relationship between Rasip1 and RUNX1 in NSCLC is still unknown. In this study, the potential function of RUNX1 involving in Rasip1 expression and the potential role of Rasip1 in lung cancer cells were investigated. Materials and methods Rasip1 and RUNX1 expressions were analyzed by quantitative reverse transcription polymerase chain reaction (qRT-PCR) and Western blotting in NSCLC cells lines. A549 and H1299 cells were transfected with plasmids or interfering RNA (siRNA) to upregulate or downregulate the expression of Rasip1 and RUNX1. Cell motility was assessed by transwell and wound-healing assay. Location of Rasip1 and RUNX1 was detected via immunofluorescence. Meanwhile, chromatin immunoprecipitation was done using an anti-RUNX1 antibody. Rasip1 promoter was constructed, and cells were lysed for the analysis of luciferase activity. Results In this study, we showed that ectopic expression or knockdown of RUNX1 resulted in a significant increase or reduction in Rasip1 expression, respectively. RUNX1 bound directly to a specific DNA sequence within Rasip1 promoter and modulated its transcription. Furthermore, silencing of Rasip1 inhibited the migration of RUNX1-overexpressing NSCLC cells through inactivation of Rac1 pathway. Moreover, we found that Rasip1 was expressed ubiquitously in NSCLC cells lines and enhanced cell migration. In addition, EGFR signaling was involved both in the expression and the subcellular localization of Rasip1. Conclusion Our data indicated that Rasip1 is regulated in part by the transcription factor RUNX1 and might be developed as a therapeutic target for NSCLC.
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Affiliation(s)
- Yan Chen
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Lin Zhang
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Lei Liu
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Shixiu Sun
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Xuyang Zhao
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Yueyuan Wang
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Yujie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China, .,Cancer Center, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Jun Du
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China, .,Cancer Center, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
| | - Luo Gu
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China, .,Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China, .,Cancer Center, Nanjing Medical University, Nanjing, Jiangsu, People's Republic of China,
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18
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Sun S, Zhang Y, Zheng J, Duan B, Cui J, Chen Y, Deng W, Ye B, Liu L, Chen Y, Du J, Gu L. HDAC6 inhibitor TST strengthens the antiproliferative effects of PI3K/mTOR inhibitor BEZ235 in breast cancer cells via suppressing RTK activation. Cell Death Dis 2018; 9:929. [PMID: 30206202 PMCID: PMC6134008 DOI: 10.1038/s41419-018-0931-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 06/30/2018] [Accepted: 07/31/2018] [Indexed: 11/23/2022]
Abstract
NVP-BEZ235 (BEZ235), an available dual PI3K/mTOR inhibitor, showed antitumor effect and provided a therapy strategy in carcinomas. However, the acquired upregulation of multiple receptor tyrosine kinases (RTKs) by NVP-BEZ235 in tumors limits its clinical efficacy. HDAC6, a class II histone deacetylase, is associated with expressions of multiple RTKs. The aim of this study was to detect whether co-treatment with HDAC6 inhibitor Tubastatin A (TST) would enhance the anticancer effects of BEZ235 in breast cancer cells. In this study, we described that treatment of breast cancer cell lines (T47D, BT474, and MDA-MB-468) with BEZ235 significantly triggered PI3K/mTOR signaling inactivation and increased multiple RTK expression, including EGFR, HER2, HER3, IGF-1 receptor, insulin receptor, and their phosphorylation levels. The adding of TST destabilized these RTKs in those breast cancer cells. Co-treatment with BEZ235 and TST reduced cell proliferative rate by strengthening Akt inactivation. In addition, the combination of these two drugs also cooperatively arrested cell cycle and DNA synthesis. In conclusion, the co-treatment with PI3K/mTOR inhibitor BEZ235 and HDAC6 inhibitor TST displayed additive antiproliferative effects on breast cancer cells through inactivating RTKs and established a rationable combination therapy to treat breast cancer.
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Affiliation(s)
- Shixiu Sun
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.,Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Yujie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Jianchao Zheng
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.,BGI Education Center, University of Chinese Academy of Sciences, Shenzhen, Guangdong, 518083, China
| | - Biao Duan
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Jie Cui
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, 221004, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Yan Chen
- Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Wenjie Deng
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Bixing Ye
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210029, China
| | - Lei Liu
- Department of Physiology, Xuzhou Medical University, Xuzhou, Jiangsu, 221004, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Yongchang Chen
- Department of Physiology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Jun Du
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China. .,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.
| | - Luo Gu
- Department of Physiology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China. .,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center For Cancer Personalized Medicine, Nanjing Medical University, Nanjing, Jiangsu, 211166, China. .,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.
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19
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Villagomez FR, Medina-Contreras O, Cerna-Cortes JF, Patino-Lopez G. The role of the oncogenic Rab35 in cancer invasion, metastasis, and immune evasion, especially in leukemia. Small GTPases 2018; 11:334-345. [PMID: 29781368 PMCID: PMC7549652 DOI: 10.1080/21541248.2018.1463895] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The study of cancer has allowed researchers to describe some biological characteristics that tumor cells acquire during their development, known as the “hallmarks of cancer” but more research is needed to expand our knowledge about cancer biology and to generate new strategies of treatment. The role that RabGTPases might play in some hallmarks of cancer represents interesting areas of study since these proteins are frequently altered in cancer. However, their participation is not well known. Recently, Rab35was recognized as an oncogenic RabGTPase and and because of its association with different cellular functions, distinctly important in immune cells, a possible role of Rab35 in leukemia can be suggested. Nevertheless, the involvement of Rab35 in cancer remains poorly understood and its possible specific role in leukemia remains unknown. In this review, we analyze general aspects of the participation of RabGTPases in cancer, and especially, the plausible role of Rab35 in leukemia.
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Affiliation(s)
- Fabian R Villagomez
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez , Ciudad de México, México.,Laboratorio de Microbiología Molecular, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomas , Ciudad de México, México
| | - Oscar Medina-Contreras
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez , Ciudad de México, México
| | - Jorge Francisco Cerna-Cortes
- Laboratorio de Microbiología Molecular, Escuela Nacional de Ciencias Biológicas del Instituto Politécnico Nacional, Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomas , Ciudad de México, México
| | - Genaro Patino-Lopez
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez , Ciudad de México, México
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20
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van Gastel J, Boddaert J, Jushaj A, Premont RT, Luttrell LM, Janssens J, Martin B, Maudsley S. GIT2-A keystone in ageing and age-related disease. Ageing Res Rev 2018; 43:46-63. [PMID: 29452267 DOI: 10.1016/j.arr.2018.02.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 02/06/2018] [Accepted: 02/08/2018] [Indexed: 12/15/2022]
Abstract
Since its discovery, G protein-coupled receptor kinase-interacting protein 2, GIT2, and its family member, GIT1, have received considerable interest concerning their potential key roles in regulating multiple inter-connected physiological and pathophysiological processes. GIT2 was first identified as a multifunctional protein that is recruited to G protein-coupled receptors (GPCRs) during the process of receptor internalization. Recent findings have demonstrated that perhaps one of the most important effects of GIT2 in physiology concerns its role in controlling multiple aspects of the complex ageing process. Ageing can be considered the most prevalent pathophysiological condition in humans, affecting all tissue systems and acting as a driving force for many common and intractable disorders. The ageing process involves a complex interplay among various deleterious activities that profoundly disrupt the body's ability to cope with damage, thus increasing susceptibility to pathophysiologies such as neurodegeneration, central obesity, osteoporosis, type 2 diabetes mellitus and atherosclerosis. The biological systems that control ageing appear to function as a series of interconnected complex networks. The inter-communication among multiple lower-complexity signaling systems within the global ageing networks is likely coordinated internally by keystones or hubs, which regulate responses to dynamic molecular events through protein-protein interactions with multiple distinct partners. Multiple lines of research have suggested that GIT2 may act as one of these network coordinators in the ageing process. Identifying and targeting keystones, such as GIT2, is thus an important approach in our understanding of, and eventual ability to, medically ameliorate or interdict age-related progressive cellular and tissue damage.
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21
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Shaughnessy R, Echard A. Rab35 GTPase and cancer: Linking membrane trafficking to tumorigenesis. Traffic 2018; 19:247-252. [PMID: 29314576 DOI: 10.1111/tra.12546] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 12/20/2017] [Accepted: 12/22/2017] [Indexed: 12/31/2022]
Abstract
Rab35 is a small GTPase that is involved in many cellular processes, including membrane trafficking, cell polarity, lipid homeostasis, immunity, phagocytosis and cytokinesis. Recent studies showed that activating mutations confer Rab35 with oncogenic properties. Conversely, downregulation of Rab35 inverts apico-basal cell polarity and promotes cell migration. Here we review Rab35's known functions in membrane trafficking and signaling, cell division and cell migration in cancer cells and discuss the importance of Rab35-dependent membrane trafficking in cancer progression.
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Affiliation(s)
- Ronan Shaughnessy
- Membrane Traffic and Cell Division Lab, Cell Biology and Infection Department, Institut Pasteur, Paris, France
| | - Arnaud Echard
- Membrane Traffic and Cell Division Lab, Cell Biology and Infection Department, Institut Pasteur, Paris, France.,Centre National de la Recherche Scientifique UMR3691, Paris, France
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22
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Helgager J, Lidov HG, Mahadevan NR, Kieran MW, Ligon KL, Alexandrescu S. A novel GIT2-BRAF fusion in pilocytic astrocytoma. Diagn Pathol 2017; 12:82. [PMID: 29141672 PMCID: PMC5688665 DOI: 10.1186/s13000-017-0669-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 11/07/2017] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND KIAA1549-BRAF fusion is the most common genetic event in pilocytic astrocytoma (PA), and leads to activation of the mitogen activated protein kinase (MAPK) signaling pathway. Fusions of BRAF with other partner genes, as well as other genetic alterations not involving BRAF but also leading to MAPK pathway activation have been described rarely. CASE PRESENTATION We present a new fusion partner in the low-grade glioma of a 10-year-old male, who presented with headaches and recent episodes of seizures. Magnetic resonance imaging (MRI) demonstrated a right temporal lobe tumor. Histological and immunohistochemical evaluation, and a next generation sequencing assay (Oncopanel, Illumina, 500 genes) including breaKmer analysis for chromosomal rearrangements were performed. Histology was remarkable for a low-grade glioma composed of mildly atypical astrocytes with piloid processes, in a focally microcystic background. Mitoses were not seen; unequivocal Rosenthal fibers or eosinophilic granular bodies were absent. The tumor was positive for OLIG2 and GFAP and negative for BRAF V600E and IDH1 R132H mutant protein immunostains. Oncopanel showed low SOX2 (3q26.33) copy number gain, and no gains at 7q34. There were no significant single nucleotide variants. BreaKmer detected a GIT2-BRAF fusion with loss of BRAF exons 1-8. The integrated diagnosis was low-grade glioma with piloid features, most consistent with pilocytic astrocytoma, WHO grade I. CONCLUSION GIT2-BRAF fusion has not been reported in the literature in any tumor. Given that the BRAF sequence deleted is identical to that seen in other fusion events in PA, it most likely acts as tumor driver by activation of the MAPK pathway.
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Affiliation(s)
- Jeffrey Helgager
- Department of Pathology, Brigham and Women’s Hospital, 55 Francis Street, Boston, MA 02115 USA
| | - Hart G. Lidov
- Department of Pathology, Boston Children’s Hospital, 300 Longwood Ave, Bader, Boston, MA 02115 USA
- Department of Pathology, Brigham and Women’s Hospital, 55 Francis Street, Boston, MA 02115 USA
| | - Navin R. Mahadevan
- Department of Pathology, Brigham and Women’s Hospital, 55 Francis Street, Boston, MA 02115 USA
| | - Mark W. Kieran
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, 450 Brookline Ave, Boston, MA 02115 USA
| | - Keith L. Ligon
- Department of Pathology, Boston Children’s Hospital, 300 Longwood Ave, Bader, Boston, MA 02115 USA
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, 450 Brookline Ave, Boston, MA 02115 USA
- Department of Pathology, Brigham and Women’s Hospital, 55 Francis Street, Boston, MA 02115 USA
| | - Sanda Alexandrescu
- Department of Pathology, Boston Children’s Hospital, 300 Longwood Ave, Bader, Boston, MA 02115 USA
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23
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Zheng J, Duan B, Sun S, Cui J, Du J, Zhang Y. Folliculin Interacts with Rab35 to Regulate EGF-Induced EGFR Degradation. Front Pharmacol 2017; 8:688. [PMID: 29018350 PMCID: PMC5622982 DOI: 10.3389/fphar.2017.00688] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/14/2017] [Indexed: 12/20/2022] Open
Abstract
Aims and Hypothesis: This study aims to investigate the mechanism involved in intracellular regulation of EGFR degradation induced by EGF. Methods: Phosphorylation of proteins related to EGFR signaling was examined by western blot analysis. Activation, connection between Rab35 and folliculin (FLCN) were assessed by pulldown, coimmunoprecipitation assays separately. The relationship between FLCN and cell growth was detected using gene overexpression and knock-down techniques. Results: Here, we demonstrate that interfering with FLCN, a tumor suppressor, reduces the rate of EGF-induced EGFR degradation, resulting in prolonged activation of downstream signaling. Rab35 is also involved in these processes. Moreover, C-terminal of FLCN binds to and activates Rab35. Of special interest is the observation that erlotinib, a selective EGFR inhibitor, not only obstructs the EGFR-mediated cellular signaling, but also abolishes EGF-stimulated EGFR degradation. Further results reveal that EGF facilitates the activation of Rab35, and FLCN modulates EGF-dependent Rab35 activation and cell growth. Conclusions: Taken together, our study proposes a negative-feedback regulation model in which FLCN mediates EGF-induced Rab35 activation, thereby increasing EGFR degradation and attenuating EGFR signaling.
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Affiliation(s)
- Jianchao Zheng
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Biao Duan
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Shixiu Sun
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Jie Cui
- Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.,Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China
| | - Jun Du
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
| | - Yujie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
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Enhanced expression and phosphorylation of Sirt7 activates smad2 and ERK signaling and promotes the cardiac fibrosis differentiation upon angiotensin-II stimulation. PLoS One 2017; 12:e0178530. [PMID: 28582407 PMCID: PMC5459426 DOI: 10.1371/journal.pone.0178530] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 05/15/2017] [Indexed: 12/11/2022] Open
Abstract
Cardiac fibroblasts (CFs) phenotypic conversion to myofibroblasts (MFs) represents a crucial event in cardiac fibrosis that leads to impaired cardiac function. However, regulation of this phenotypic transformation remains unclear. Here, we showed that sirtuin-7 (Sirt7) plays an important role in the regulation of MFs differentiation. Sirt7 expression and phosphorylation were upregulated in CFs upon angiotensin-II (Ang-II) stimulation. Sirt7 depletion by siRNA in CFs resulted in decreased cell proliferation and extracellular matrix (ECM) deposition. Further, examination of Sirt7-depleted CFs demonstrated significantly lower expression of α-smooth muscle actin (α-SMA), the classical marker of MFs differentiation, and decreased formation of focal adhesions. Moreover, overexpression of Sirt7 increased α-SMA expression in Ang-II treated CFs and exacerbated Ang-II-induced MFs differentiation. Moreover, Sirt7 depletion could largely reverse Ang-II induced increase of nuclear translocalization and activity of smad2 and extracellular regulated kinases (ERK) in CFs. Importantly, the increased differentiation of CFs to MFs was also abolished by smad2 siRNA or U0126. Our findings reveal a novel role of Sirt7 and its phosphorylation in the phenotypic conversion of CFs to MFs and might lead to the development of new therapeutic and prognostic tools for cardiac fibrosis.
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