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Martellucci S, Flütsch A, Carter M, Norimoto M, Pizzo D, Mantuano E, Sadri M, Wang Z, Chillin-Fuentes D, Rosenthal SB, Azmoon P, Gonias SL, Campana WM. Axon-derived PACSIN1 binds to the Schwann cell survival receptor, LRP1, and transactivates TrkC to promote gliatrophic activities. Glia 2024; 72:916-937. [PMID: 38372375 DOI: 10.1002/glia.24510] [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: 07/09/2023] [Revised: 01/12/2024] [Accepted: 01/19/2024] [Indexed: 02/20/2024]
Abstract
Schwann cells (SCs) undergo phenotypic transformation and then orchestrate nerve repair following PNS injury. The ligands and receptors that activate and sustain SC transformation remain incompletely understood. Proteins released by injured axons represent important candidates for activating the SC Repair Program. The low-density lipoprotein receptor-related protein-1 (LRP1) is acutely up-regulated in SCs in response to injury, activating c-Jun, and promoting SC survival. To identify novel LRP1 ligands released in PNS injury, we applied a discovery-based approach in which extracellular proteins in the injured nerve were captured using Fc-fusion proteins containing the ligand-binding motifs of LRP1 (CCR2 and CCR4). An intracellular neuron-specific protein, Protein Kinase C and Casein Kinase Substrate in Neurons (PACSIN1) was identified and validated as an LRP1 ligand. Recombinant PACSIN1 activated c-Jun and ERK1/2 in cultured SCs. Silencing Lrp1 or inhibiting the LRP1 cell-signaling co-receptor, the NMDA-R, blocked the effects of PACSIN1 on c-Jun and ERK1/2 phosphorylation. Intraneural injection of PACSIN1 into crush-injured sciatic nerves activated c-Jun in wild-type mice, but not in mice in which Lrp1 is conditionally deleted in SCs. Transcriptome profiling of SCs revealed that PACSIN1 mediates gene expression events consistent with transformation to the repair phenotype. PACSIN1 promoted SC migration and viability following the TNFα challenge. When Src family kinases were pharmacologically inhibited or the receptor tyrosine kinase, TrkC, was genetically silenced or pharmacologically inhibited, PACSIN1 failed to induce cell signaling and prevent SC death. Collectively, these studies demonstrate that PACSIN1 is a novel axon-derived LRP1 ligand that activates SC repair signaling by transactivating TrkC.
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Affiliation(s)
- Stefano Martellucci
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Andreas Flütsch
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Mark Carter
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Masaki Norimoto
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Donald Pizzo
- Department of Pathology, University of California San Diego, La Jolla, California, USA
| | - Elisabetta Mantuano
- Department of Pathology, University of California San Diego, La Jolla, California, USA
| | - Mahrou Sadri
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Zixuan Wang
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
| | - Daisy Chillin-Fuentes
- Center for Computational Biology & Bioinformatics, Altman Clinical & Translational Research Institute, University of California San Diego, La Jolla, California, USA
| | - Sara Brin Rosenthal
- Center for Computational Biology & Bioinformatics, Altman Clinical & Translational Research Institute, University of California San Diego, La Jolla, California, USA
| | - Pardis Azmoon
- Department of Pathology, University of California San Diego, La Jolla, California, USA
| | - Steven L Gonias
- Department of Pathology, University of California San Diego, La Jolla, California, USA
| | - Wendy M Campana
- Department of Anesthesiology, University of California San Diego, La Jolla, California, USA
- Program in Neurosciences, University of California San Diego, La Jolla, California, USA
- Division of Research, San Diego VA Health Care System, San Diego, California, USA
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Dumont V, Lehtonen S. PACSIN proteins in vivo: Roles in development and physiology. Acta Physiol (Oxf) 2022; 234:e13783. [PMID: 34990060 PMCID: PMC9285741 DOI: 10.1111/apha.13783] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 11/15/2021] [Accepted: 01/01/2022] [Indexed: 12/22/2022]
Abstract
Protein kinase C and casein kinase substrate in neurons (PACSINs), or syndapins (synaptic dynamin‐associated proteins), are a family of proteins involved in the regulation of cell cytoskeleton, intracellular trafficking and signalling. Over the last twenty years, PACSINs have been mostly studied in the in vitro and ex vivo settings, and only in the last decade reports on their function in vivo have emerged. We first summarize the identification, structure and cellular functions of PACSINs, and then focus on the relevance of PACSINs in vivo. During development in various model organisms, PACSINs participate in diverse processes, such as neural crest cell development, gastrulation, laterality development and neuromuscular junction formation. In mouse, PACSIN2 regulates angiogenesis during retinal development and in human, PACSIN2 associates with monosomy and embryonic implantation. In adulthood, PACSIN1 has been extensively studied in the brain and shown to regulate neuromorphogenesis, receptor trafficking and synaptic plasticity. Several genetic studies suggest a role for PACSIN1 in the development of schizophrenia, which is also supported by the phenotype of mice depleted of PACSIN1. PACSIN2 plays an essential role in the maintenance of intestinal homeostasis and participates in kidney repair processes after injury. PACSIN3 is abundant in muscle tissue and necessary for caveolar biogenesis to create membrane reservoirs, thus controlling muscle function, and has been linked to certain genetic muscular disorders. The above examples illustrate the importance of PACSINs in diverse physiological or tissue repair processes in various organs, and associations to diseases when their functions are disturbed.
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Affiliation(s)
- Vincent Dumont
- Department of Pathology and Research Program for Clinical and Molecular Metabolism Faculty of Medicine University of Helsinki Helsinki Finland
| | - Sanna Lehtonen
- Department of Pathology and Research Program for Clinical and Molecular Metabolism Faculty of Medicine University of Helsinki Helsinki Finland
- Department of Pathology University of Helsinki Helsinki Finland
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Zimu Z, Jia Z, Xian F, Rui M, Yuting R, Yuan W, Tianhong W, Mian M, Yinlong L, Enfang S. Decreased Expression of PACSIN1 in Brain Glioma Samples Predicts Poor Prognosis. Front Mol Biosci 2021; 8:696072. [PMID: 34422904 PMCID: PMC8375027 DOI: 10.3389/fmolb.2021.696072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 07/27/2021] [Indexed: 12/03/2022] Open
Abstract
Gliomas are the most severe brain tumours with a poor prognosis. Although surgery, postoperative radiotherapy and chemotherapy can improve the survival rate of glioma patients, the prognosis of most glioma patients is still poor. In recent years, the influence of gene-targeted therapy on gliomas has been gradually discovered, and intervening the occurrence and development of brain gliomas from the perspective of the gene will significantly improve treatment prognosis. Protein Kinase C and Casein Kinase Substrate in Neurons 1 (PACSIN1) is a member of the conserved peripheral membrane protein family in eukaryotes. Improper expression of PACSIN1 can lead to neurological diseases such as Huntington’s disease and schizophrenia. However, its relationship with tumours or even gliomas has not been explored. The study aims to explore PACSIN1 as a prognostic factor that can predict overall survival (OS) for gliomas. We collected the data from CGGA, TCGA, GEO databases and the pathological glioma tissue specimens from 15 clinical glioma patients surgically resected. The differential expression of PACSIN1 in various clinical indicators, the genes related to PACSIN1 expression, the prognostic value of PACSIN1 and the functional annotations and pathway analysis of differently expressed genes (DEGs) were analysed. The results revealed that PACSIN1 had low expression levels in grade IV, IDH1 wild-type and 1p/19q non-codel group gliomas, and PACSIN1 was considered a mesenchymal molecular subtype marker. PACSIN1 expression is positively correlated with OS in all gliomas and it was found that PACSIN1 influenced the occurrence and development of gliomas through synaptic transmission. The PACSIN1 expression is negatively correlated with the malignant degree of gliomas and positively associated with the OS, indicating that PACSIN1 would play an essential role in the occurrence and development of gliomas and might be a potential new biomarker and targeted therapy site for gliomas.
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Affiliation(s)
- Zhou Zimu
- School of Nursing, Nanjing Medical University, Nanjing, China.,Cancer Nursing Research Branch, Nursing Research Center, Nanjing Medical University, Nanjing, China
| | - Zhang Jia
- School of Nursing, Nanjing Medical University, Nanjing, China
| | - Fu Xian
- Department of Neurosurgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Gusu School, Nanjing Medical University, Suzhou, China
| | - Ma Rui
- School of Nursing, Nanjing Medical University, Nanjing, China
| | - Ren Yuting
- School of Nursing, Nanjing Medical University, Nanjing, China
| | - Wei Yuan
- School of Nursing, Nanjing Medical University, Nanjing, China
| | - Wen Tianhong
- School of Nursing, Nanjing Medical University, Nanjing, China
| | - Ma Mian
- Department of Neurosurgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Gusu School, Nanjing Medical University, Suzhou, China
| | - Liu Yinlong
- Department of Neurosurgery, The Affiliated Huashan Hospital, Fudan University, Shanghai, China.,Department of Neurosurgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Gusu School, Nanjing Medical University, Suzhou, China
| | - Shan Enfang
- School of Nursing, Nanjing Medical University, Nanjing, China.,Cancer Nursing Research Branch, Nursing Research Center, Nanjing Medical University, Nanjing, China
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Broad Kinase Inhibition Mitigates Early Neuronal Dysfunction in Tauopathy. Int J Mol Sci 2021; 22:ijms22031186. [PMID: 33530349 PMCID: PMC7865413 DOI: 10.3390/ijms22031186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/11/2021] [Accepted: 01/13/2021] [Indexed: 12/26/2022] Open
Abstract
Tauopathies are a group of more than twenty known disorders that involve progressive neurodegeneration, cognitive decline and pathological tau accumulation. Current therapeutic strategies provide only limited, late-stage symptomatic treatment. This is partly due to lack of understanding of the molecular mechanisms linking tau and cellular dysfunction, especially during the early stages of disease progression. In this study, we treated early stage tau transgenic mice with a multi-target kinase inhibitor to identify novel substrates that contribute to cognitive impairment and exhibit therapeutic potential. Drug treatment significantly ameliorated brain atrophy and cognitive function as determined by behavioral testing and a sensitive imaging technique called manganese-enhanced magnetic resonance imaging (MEMRI) with quantitative R1 mapping. Surprisingly, these benefits occurred despite unchanged hyperphosphorylated tau levels. To elucidate the mechanism behind these improved cognitive outcomes, we performed quantitative proteomics to determine the altered protein network during this early stage in tauopathy and compare this model with the human Alzheimer’s disease (AD) proteome. We identified a cluster of preserved pathways shared with human tauopathy with striking potential for broad multi-target kinase intervention. We further report high confidence candidate proteins as novel therapeutically relevant targets for the treatment of tauopathy. Proteomics data are available via ProteomeXchange with identifier PXD023562.
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Insinna C, Lu Q, Teixeira I, Harned A, Semler EM, Stauffer J, Magidson V, Tiwari A, Kenworthy AK, Narayan K, Westlake CJ. Investigation of F-BAR domain PACSIN proteins uncovers membrane tubulation function in cilia assembly and transport. Nat Commun 2019; 10:428. [PMID: 30683896 PMCID: PMC6347608 DOI: 10.1038/s41467-018-08192-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 12/20/2018] [Indexed: 12/03/2022] Open
Abstract
The intracellular ciliogenesis pathway requires membrane trafficking, fusion, and reorganization. Here, we demonstrate in human cells and zebrafish that the F-BAR domain containing proteins PACSIN1 and -2 play an essential role in ciliogenesis, similar to their binding partner and membrane reorganizer EHD1. In mature cilia, PACSINs and EHDs are dynamically localized to the ciliary pocket membrane (CPM) and transported away from this structure on membrane tubules along with proteins that exit the cilium. PACSINs function early in ciliogenesis at the ciliary vesicle (CV) stage to promote mother centriole to basal body transition. Remarkably, we show that PACSIN1 and EHD1 assemble membrane t7ubules from the developing intracellular cilium that attach to the plasma membrane, creating an extracellular membrane channel (EMC) to the outside of the cell. Together, our work uncovers a function for F-BAR proteins and membrane tubulation in ciliogenesis and explains how the intracellular cilium emerges from the cell.
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Affiliation(s)
- Christine Insinna
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Quanlong Lu
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Isabella Teixeira
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Adam Harned
- Center for Molecular Microscopy, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21701, USA
- Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Elizabeth M Semler
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Jim Stauffer
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Valentin Magidson
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA
| | - Ajit Tiwari
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA
| | - Anne K Kenworthy
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA
| | - Kedar Narayan
- Center for Molecular Microscopy, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21701, USA
- Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Christopher J Westlake
- Laboratory of Cellular and Developmental Signaling, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, 21702, USA.
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Kobeissy FH, Guingab-Cagmat JD, Zhang Z, Moghieb A, Glushakova OY, Mondello S, Boutté AM, Anagli J, Rubenstein R, Bahmad H, Wagner AK, Hayes RL, Wang KKW. Neuroproteomics and Systems Biology Approach to Identify Temporal Biomarker Changes Post Experimental Traumatic Brain Injury in Rats. Front Neurol 2016; 7:198. [PMID: 27920753 PMCID: PMC5118702 DOI: 10.3389/fneur.2016.00198] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/28/2016] [Indexed: 01/15/2023] Open
Abstract
Traumatic brain injury (TBI) represents a critical health problem of which diagnosis, management, and treatment remain challenging. TBI is a contributing factor in approximately one-third of all injury-related deaths in the United States. The Centers for Disease Control and Prevention estimate that 1.7 million people suffer a TBI in the United States annually. Efforts continue to focus on elucidating the complex molecular mechanisms underlying TBI pathophysiology and defining sensitive and specific biomarkers that can aid in improving patient management and care. Recently, the area of neuroproteomics–systems biology is proving to be a prominent tool in biomarker discovery for central nervous system injury and other neurological diseases. In this work, we employed the controlled cortical impact (CCI) model of experimental TBI in rat model to assess the temporal–global proteome changes after acute (1 day) and for the first time, subacute (7 days), post-injury time frame using the established cation–anion exchange chromatography-1D SDS gel electrophoresis LC–MS/MS platform for protein separation combined with discrete systems biology analyses to identify temporal biomarker changes related to this rat TBI model. Rather than focusing on any one individual molecular entity, we used in silico systems biology approach to understand the global dynamics that govern proteins that are differentially altered post-injury. In addition, gene ontology analysis of the proteomic data was conducted in order to categorize the proteins by molecular function, biological process, and cellular localization. Results show alterations in several proteins related to inflammatory responses and oxidative stress in both acute (1 day) and subacute (7 days) periods post-TBI. Moreover, results suggest a differential upregulation of neuroprotective proteins at 7 days post-CCI involved in cellular functions such as neurite growth, regeneration, and axonal guidance. Our study is among the first to assess temporal neuroproteome changes in the CCI model. Data presented here unveil potential neural biomarkers and therapeutic targets that could be used for diagnosis, for treatment and, most importantly, for temporal prognostic assessment following brain injury. Of interest, this work relies on in silico bioinformatics approach to draw its conclusion; further work is conducted for functional studies to validate and confirm the omics data obtained.
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Affiliation(s)
- Firas H Kobeissy
- Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Psychiatry, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | | | - Zhiqun Zhang
- Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Psychiatry, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Ahmed Moghieb
- Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Psychiatry, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Olena Y Glushakova
- Department of Neurosurgery, Virginia Commonwealth University School of Medicine , Richmond, VA , USA
| | - Stefania Mondello
- Department of Neurosciences, University of Messina , Messina , Italy
| | - Angela M Boutté
- Brain Trauma Neuroprotection and Neurorestoration Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research , Silver Spring, MD , USA
| | - John Anagli
- NeuroTheranostics Inc., Detroit, MI, USA; Henry Ford Health System, Detroit, MI, USA
| | - Richard Rubenstein
- Department of Neurology, SUNY Downstate Medical Center, Brooklyn, NY, USA; Department of Physiology and Pharmacology, SUNY Downstate Medical Center, Brooklyn, NY, USA
| | - Hisham Bahmad
- Faculty of Medicine, Beirut Arab University, Beirut, Lebanon; Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | - Amy K Wagner
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA, USA; Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ronald L Hayes
- Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Psychiatry, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Department of Neurosurgery, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Kevin K W Wang
- Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Psychiatry, McKnight Brain Institute, University of Florida, Gainesville, FL, USA; Program for Neurotrauma, Neuroproteomics and Biomarkers Research, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
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Martin TM, Plautz SA, Pannier AK. Temporal endogenous gene expression profiles in response to lipid-mediated transfection. J Gene Med 2015; 17:14-32. [PMID: 25663588 DOI: 10.1002/jgm.2821] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 02/01/2015] [Accepted: 02/03/2015] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Design of efficient nonviral gene delivery systems is limited as a result of the rudimentary understanding of the specific molecules and processes that facilitate DNA transfer. METHODS Lipoplexes formed with Lipofectamine 2000 (LF2000) and plasmid-encoding green fluorescent protein (GFP) were delivered to the HEK 293T cell line. After treating cells with lipoplexes, HG-U133 Affymetrix microarrays were used to identify endogenous genes differentially expressed between treated and untreated cells (2 h exposure) or between flow-separated transfected cells (GFP+) and treated, untransfected cells (GFP-) at 8, 16 and 24 h after lipoplex treatment. Cell priming studies were conducted using pharmacologic agents to alter endogenous levels of the identified differentially expressed genes to determine effect on transfection levels. RESULTS Relative to untreated cells 2 h after lipoplex treatment, only downregulated genes were identified ≥ 30-fold: ALMS1, ITGB1, FCGR3A, DOCK10 and ZDDHC13. Subsequently, relative to GFP- cells, the GFP+ cell population showed at least a five-fold upregulation of RAP1A and PACSIN3 (8 h) or HSPA6 and RAP1A (16 and 24 h). Pharmacologic studies altering endogenous levels for ALMS1, FCGR3A, and DOCK10 (involved in filopodia protrusions), ITGB1 (integrin signaling), ZDDHC13 (membrane trafficking) and PACSIN3 (proteolytic shedding of membrane receptors) were able to increase or decrease transgene production. CONCLUSIONS RAP1A, PACSIN3 and HSPA6 may help lipoplex-treated cells overcome a transcriptional shutdown due to treatment with lipoplexes and provide new targets for investigating molecular mechanisms of transfection or for enhancing transfection through cell priming or engineering of the nonviral gene delivery system.
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Affiliation(s)
- Timothy M Martin
- Department of Pharmaceutical Sciences, Durham Research Center II, University of Nebraska-Medical Center, Omaha, NE, USA
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Sinnott R, Winters L, Larson B, Mytsa D, Taus P, Cappell KM, Whitehurst AW. Mechanisms promoting escape from mitotic stress-induced tumor cell death. Cancer Res 2014; 74:3857-69. [PMID: 24860162 DOI: 10.1158/0008-5472.can-13-3398] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Non-small cell lung cancer (NSCLC) is notorious for its paltry responses to first-line therapeutic regimens. In contrast to acquired chemoresistance, little is known about the molecular underpinnings of the intrinsic resistance of chemo-naïve NSCLC. Here we report that intrinsic resistance to paclitaxel in NSCLC occurs at a cell-autonomous level because of the uncoupling of mitotic defects from apoptosis. To identify components that permit escape from mitotic stress-induced death, we used a genome-wide RNAi-based strategy, which combines a high-throughput toxicity screen with a live-cell imaging platform to measure mitotic fate. This strategy revealed that prolonging mitotic arrest with a small molecule inhibitor of the APC/cyclosome could sensitize otherwise paclitaxel-resistant NSCLC. We also defined novel roles for CASC1 and TRIM69 in supporting resistance to spindle poisons. CASC1, which is frequently co-amplified with KRAS in lung tumors, is essential for microtubule polymerization and satisfaction of the spindle assembly checkpoint. TRIM69, which associates with spindle poles and promotes centrosomal clustering, is essential for formation of a bipolar spindle. Notably, RNAi-mediated attenuation of CASC1 or TRIM69 was sufficient to inhibit tumor growth in vivo. On the basis of our results, we hypothesize that tumor evolution selects for a permissive mitotic checkpoint, which may promote survival despite chromosome segregation errors. Attacking this adaptation may restore the apoptotic consequences of mitotic damage to permit the therapeutic eradication of drug-resistant cancer cells.
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Affiliation(s)
- Rebecca Sinnott
- Authors' Affiliations: Department of Pharmacology and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill
| | - Leah Winters
- Department of Anesthesiology, University of Colorado, Aurora, Colorado; and
| | - Brittany Larson
- Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Daniela Mytsa
- Authors' Affiliations: Department of Pharmacology and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill
| | - Patrick Taus
- Authors' Affiliations: Department of Pharmacology and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill
| | | | - Angelique W Whitehurst
- Authors' Affiliations: Department of Pharmacology and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill;
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Tau protein modifications and interactions: their role in function and dysfunction. Int J Mol Sci 2014; 15:4671-713. [PMID: 24646911 PMCID: PMC3975420 DOI: 10.3390/ijms15034671] [Citation(s) in RCA: 228] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/11/2014] [Accepted: 03/04/2014] [Indexed: 01/29/2023] Open
Abstract
Tau protein is abundant in the central nervous system and involved in microtubule assembly and stabilization. It is predominantly associated with axonal microtubules and present at lower level in dendrites where it is engaged in signaling functions. Post-translational modifications of tau and its interaction with several proteins play an important regulatory role in the physiology of tau. As a consequence of abnormal modifications and expression, tau is redistributed from neuronal processes to the soma and forms toxic oligomers or aggregated deposits. The accumulation of tau protein is increasingly recognized as the neuropathological hallmark of a number of dementia disorders known as tauopathies. Dysfunction of tau protein may contribute to collapse of cytoskeleton, thereby causing improper anterograde and retrograde movement of motor proteins and their cargos on microtubules. These disturbances in intraneuronal signaling may compromise synaptic transmission as well as trophic support mechanisms in neurons.
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Kovářová D, Plachý J, Kosla J, Trejbalová K, Čermák V, Hejnar J. Downregulation of HOPX Controls Metastatic Behavior in Sarcoma Cells and Identifies Genes Associated with Metastasis. Mol Cancer Res 2013; 11:1235-47. [DOI: 10.1158/1541-7786.mcr-12-0687] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Polyglutamine domain flexibility mediates the proximity between flanking sequences in huntingtin. Proc Natl Acad Sci U S A 2013; 110:14610-5. [PMID: 23898200 DOI: 10.1073/pnas.1301342110] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Huntington disease (HD) is a neurodegenerative disorder caused by a CAG expansion within the huntingtin gene that encodes a polymorphic glutamine tract at the amino terminus of the huntingtin protein. HD is one of nine polyglutamine expansion diseases. The clinical threshold of polyglutamine expansion for HD is near 37 repeats, but the mechanism of this pathogenic length is poorly understood. Using Förster resonance energy transfer, we describe an intramolecular proximity between the N17 domain and the downstream polyproline region that flanks the polyglutamine tract of huntingtin. Our data support the hypothesis that the polyglutamine tract can act as a flexible domain, allowing the flanking domains to come into close spatial proximity. This flexibility is impaired with expanded polyglutamine tracts, and we can detect changes in huntingtin conformation at the pathogenic threshold for HD. Altering the structure of N17, either via phosphomimicry or with small molecules, also affects the proximity between the flanking domains. The structural capacity of N17 to fold back toward distal regions within huntingtin requires an interacting protein, protein kinase C and casein kinase 2 substrate in neurons 1 (PACSIN1). This protein has the ability to bind both N17 and the polyproline region, stabilizing the interaction between these two domains. We also developed an antibody-based FRET assay that can detect conformational changes within endogenous huntingtin in wild-type versus HD fibroblasts. Therefore, we hypothesize that wild-type length polyglutamine tracts within huntingtin can form a flexible domain that is essential for proper functional intramolecular proximity, conformations, and dynamics.
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Tip-to-tip interaction in the crystal packing of PACSIN 2 is important in regulating tubulation activity. Protein Cell 2013; 4:695-701. [PMID: 23888307 DOI: 10.1007/s13238-013-3041-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Accepted: 07/05/2013] [Indexed: 02/04/2023] Open
Abstract
The F-BAR domain containing proteins PACSINs are cytoplasmic phosphoproteins involved in various membrane deformations, such as actin reorganization, vesicle transport and microtubule movement. Our previous study shows that all PACSINs are composed of crescent shaped dimers with two wedge loops, and the wedge loop-mediated lateral interaction between neighboring dimers is important for protein packing and tubulation activity. Here, from the crystal packing of PACSIN 2, we observed a tight tip-to-tip interaction, in addition to the wedge loop-mediated lateral interaction. With this tip-to-tip interaction, the whole packing of PACSIN 2 shows a spiral-like assembly with a central hole from the top view. Elimination of this tip-to-tip connection inhibited the tubulation function of PACSIN 2, indicating that tip-to-tip interaction plays an important role in membrane deformation activity. Together with our previous study, we proposed a packing model for the assembly of PACSIN 2 on membrane, where the proteins are connected by tip-to-tip and wedge loop-mediated lateral interactions on the surface of membrane to generate various diameter tubules.
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Quan A, Robinson PJ. Syndapin--a membrane remodelling and endocytic F-BAR protein. FEBS J 2013; 280:5198-212. [PMID: 23668323 DOI: 10.1111/febs.12343] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 05/07/2013] [Accepted: 05/08/2013] [Indexed: 12/17/2022]
Abstract
Syndapin [also called PACSIN (protein kinase C and casein kinase II interacting protein)] is an Fes-CIP4 homology Bin-amphiphysin-Rvs161/167 (F-BAR) and Src-homology 3 domain-containing protein. Three genes give rise to three main isoforms in mammalian cells. They each function in different endocytic and vesicle trafficking pathways and provide critical links between the cytoskeletal network in different cellular processes, such as neuronal morphogenesis and cell migration. The membrane remodelling activity of syndapin via its F-BAR domain and its interaction partners, such as dynamin and neural Wiskott-Aldrich syndrome protein binding to its Src-homology 3 domain, are important with respect to its function. Its various partner proteins provide insights into its mechanism of action, as well as its differential roles in these cellular processes. Signalling pathways leading to the regulation of syndapin function by phosphorylation are now contributing to our understanding of the broader functions of this family of proteins.
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Affiliation(s)
- Annie Quan
- Cell Signalling Unit, Children's Medical Research Institute, The University of Sydney, New South Wales, Australia
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Yao G, Luyten A, Takakura A, Plomann M, Zhou J. The cytoplasmic protein Pacsin 2 in kidney development and injury repair. Kidney Int 2012; 83:426-37. [PMID: 23235565 DOI: 10.1038/ki.2012.379] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The protein kinase C and casein kinase 2 substrate in neurons (Pacsin) is a subfamily of membrane-binding proteins that participates in vesicle trafficking and cytoskeleton organization. Here, we studied Pacsin 2 in kidney development and repair following injury. In the postnatal developing kidneys, Pacsin 2 was found to be expressed in both ureteric bud- and mesenchyme-derived structures including proximal and distal tubules, Bowman's capsule, and the glomerular tuft. In the adult kidney, its expression was decreased in proximal tubules but increased in glomerular tuft when compared to that in the developing kidneys. Interestingly, Pacsin 2 expression was significantly upregulated during the repair phase after ischemia-reperfusion injury, especially on the apical brush border of proximal tubules that experienced massive damage. Pacsin 2 localized to the primary cilia of renal epithelial cells. Knockdown of Pacsin 2 by shRNA did not affect the cell cycle or cell polarity; however, it increased the length of primary cilia, and resulted in significant tubulogenic defects in three-dimensional cell culture. Thus, we propose that Pacsin 2 contributes to kidney development and repair in a nephron-specific manner.
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Affiliation(s)
- Gang Yao
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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Liu Y, Lv K, Li Z, Yu ACH, Chen J, Teng J. PACSIN1, a Tau-interacting protein, regulates axonal elongation and branching by facilitating microtubule instability. J Biol Chem 2012; 287:39911-24. [PMID: 23035120 DOI: 10.1074/jbc.m112.403451] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Tau is a major member of the neuronal microtubule-associated proteins. It promotes tubulin assembly and stabilizes axonal microtubules. Previous studies have demonstrated that Tau forms cross-bridges between microtubules, with some particles located on cross-bridges, suggesting that some proteins interact with Tau and might be involved in regulating Tau-related microtubule dynamics. This study reports that PACSIN1 interacts with Tau in axon. PACSIN1 blockade results in impaired axonal elongation and a higher number of primary axonal branches in mouse dorsal root ganglia neurons, which is induced by increasing the binding ability of Tau to microtubules. In PACSIN1-blocked dorsal root ganglia neurons, a greater amount of Tau is inclined to accumulate in the central domain of growth cones, and it promotes the stability of the microtubule network. Taken together, these results suggest that PACSIN1 is an important Tau binding partner in regulating microtubule dynamics and forming axonal plasticity.
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Affiliation(s)
- Yingying Liu
- Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100191, China
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Bai X, Meng G, Luo M, Zheng X. Rigidity of wedge loop in PACSIN 3 protein is a key factor in dictating diameters of tubules. J Biol Chem 2012; 287:22387-96. [PMID: 22573331 DOI: 10.1074/jbc.m112.358960] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BAR (Bin/amphiphysin/Rvs) domain-containing proteins participate in cellular membrane remodeling. The F-BAR proteins normally generate low curvature tubules. However, in the PACSIN subfamily, the F-BAR domain from PACSIN 1 and 2 can induce both high and low curvature tubules. We found that unlike PACSIN 1 and 2, PACSIN 3 could only induce low curvature tubules. To elucidate the key factors that dictate the tubule curvature, crystal structures of all three PACSIN F-BAR domains were determined. A novel type of lateral interaction mediated by a wedge loop is observed between the F-BAR neighboring dimers. Comparisons of the structures of PACSIN 3 with PACSIN 1 and 2 indicate that the wedge loop of PACSIN 3 is more rigid, which influences the lateral interactions between assembled dimers. We further identified the residues that affect the rigidity of the loop by mutagenesis and determined the structures of two PACSIN 3 wedge loop mutants. Our results suggest that the rigidity-mediated conformations of the wedge loop correlate well with the various crystal packing modes and membrane tubulations. Thus, the rigidity of the wedge loop is a key factor in dictating tubule diameters.
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Affiliation(s)
- Xiaoyun Bai
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing 100871, China
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17
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Manavalan A, Feng L, Sze SK, Hu JM, Heese K. New insights into the brain protein metabolism of Gastrodia elata-treated rats by quantitative proteomics. J Proteomics 2012; 75:2468-79. [PMID: 22402058 DOI: 10.1016/j.jprot.2012.02.029] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 02/13/2012] [Accepted: 02/20/2012] [Indexed: 01/05/2023]
Abstract
Gastrodia elata (tianma) is a traditional Chinese herbal medicine (TCM) often used for the treatment of cerebrovascular diseases. In this study, we investigated the effects of tianma on the brain protein metabolism by quantitative proteomics to gain evidence for a direct relationship between tianma treatment and brain functions. One-year-old rats were treated with tianma (~2.5 g/kg/day) for 3months and the brain tissue proteome was analyzed by using the iTRAQ (isobaric tag for relative and absolute quantification) technology. According to our results, the long-term treatment with tianma could modulate the brain protein metabolism at the proteome level by down-regulating the expressions of various proteins, such as Gnao1 and Dctn2, which are related to neuronal growth cone control and synaptic activities. In addition, tianma treatment also induced the up-regulation of molecular chaperons and proteins related to the misfolded protein response, like Anxa5, and also other proteins involved in Huntington's disease (HD) (e.g. Pacsin1 and Arf3). Concluding, tianma could eventually contribute to activities related to synaptic plasticity and neuro-restorative processes and thus might be a novel candidate agent for the treatment of neurodegenerative diseases by regulating the brain proteome.
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Affiliation(s)
- Arulmani Manavalan
- School of Biological Sciences, College of Science, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
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Bai X, Meng G, Zheng X. Cloning, purification, crystallization and preliminary X-ray diffraction analysis of mouse PACSIN 3 protein. Acta Crystallogr Sect F Struct Biol Cryst Commun 2012; 68:159-62. [PMID: 22297988 DOI: 10.1107/s1744309111049116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Accepted: 11/17/2011] [Indexed: 11/10/2022]
Abstract
PACSIN-family proteins are cytoplasmic proteins that have vesicle-transport, membrane-dynamics, actin-reorganization and microtubule activities. Here, the N-terminal F-BAR domain of mouse PACSIN 3, which contains 341 amino acids, was successfully cloned, purified and crystallized. The crystal of PACSIN 3 (1-341) diffracted to 2.6 Å resolution and belonged to space group P2(1), with unit-cell parameters a = 46.9, b = 54.7, c = 193.7 Å, α = 90, β = 96.9, γ = 90°. These data should provide further information on PACSIN-family protein structures.
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Affiliation(s)
- Xiaoyun Bai
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, People's Republic of China
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de Kreuk BJ, Nethe M, Fernandez-Borja M, Anthony EC, Hensbergen PJ, Deelder AM, Plomann M, Hordijk PL. The F-BAR domain protein PACSIN2 associates with Rac1 and regulates cell spreading and migration. J Cell Sci 2011; 124:2375-88. [PMID: 21693584 DOI: 10.1242/jcs.080630] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The Rac1 GTPase controls cytoskeletal dynamics and is a key regulator of cell spreading and migration mediated by signaling through effector proteins, such as the PAK kinases and the Scar and WAVE proteins. We previously identified a series of regulatory proteins that associate with Rac1 through its hypervariable C-terminal domain, including the Rac1 activator β-Pix (also known as Rho guanine-nucleotide-exchange factor 7) and the membrane adapter caveolin-1. Here, we show that Rac1 associates, through its C-terminus, with the F-BAR domain protein PACSIN2, an inducer of membrane tubulation and a regulator of endocytosis. We show that Rac1 localizes with PACSIN2 at intracellular tubular structures and on early endosomes. Active Rac1 induces a loss of PACSIN2-positive tubular structures. By contrast, Rac1 inhibition results in an accumulation of PACSIN2-positive tubules. In addition, PACSIN2 appears to regulate Rac1 signaling; siRNA-mediated loss of PACSIN2 increases the levels of Rac1-GTP and promotes cell spreading and migration in a wound healing assay. Moreover, ectopic expression of PACSIN2 reduces Rac1-GTP levels in a fashion that is dependent on the PACSIN2-Rac1 interaction, on the membrane-tubulating capacity of PACSIN2 and on dynamin. These data identify the BAR-domain protein PACSIN2 as a Rac1 interactor that regulates Rac1-mediated cell spreading and migration.
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Affiliation(s)
- Bart-Jan de Kreuk
- Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam, 1066 CX Amsterdam, The Netherlands
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Škalamera D, Ranall MV, Wilson BM, Leo P, Purdon AS, Hyde C, Nourbakhsh E, Grimmond SM, Barry SC, Gabrielli B, Gonda TJ. A high-throughput platform for lentiviral overexpression screening of the human ORFeome. PLoS One 2011; 6:e20057. [PMID: 21629697 PMCID: PMC3101218 DOI: 10.1371/journal.pone.0020057] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Accepted: 04/24/2011] [Indexed: 11/22/2022] Open
Abstract
In response to the growing need for functional analysis of the human genome, we have developed a platform for high-throughput functional screening of genes overexpressed from lentiviral vectors. Protein-coding human open reading frames (ORFs) from the Mammalian Gene Collection were transferred into lentiviral expression vector using the highly efficient Gateway recombination cloning. Target ORFs were inserted into the vector downstream of a constitutive promoter and upstream of an IRES controlled GFP reporter, so that their transfection, transduction and expression could be monitored by fluorescence. The expression plasmids and viral packaging plasmids were combined and transfected into 293T cells to produce virus, which was then used to transduce the screening cell line. We have optimised the transfection and transduction procedures so that they can be performed using robotic liquid handling systems in arrayed 96-well microplate, one-gene-per-well format, without the need to concentrate the viral supernatant. Since lentiviruses can infect both dividing and non-dividing cells, this system can be used to overexpress human ORFs in a broad spectrum of experimental contexts. We tested the platform in a 1990 gene pilot screen for genes that can increase proliferation of the non-tumorigenic mammary epithelial cell line MCF-10A after removal of growth factors. Transduced cells were labelled with the nucleoside analogue 5-ethynyl-2′-deoxyuridine (EdU) to detect cells progressing through S phase. Hits were identified using high-content imaging and statistical analysis and confirmed with vectors using two different promoters (CMV and EF1α). The screen demonstrates the reliability, versatility and utility of our screening platform, and identifies novel cell cycle/proliferative activities for a number of genes.
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Affiliation(s)
- Dubravka Škalamera
- University of Queensland Diamantina Institute, Princess Alexandra Hospital, Brisbane, Queensland, Australia.
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Increased cellular apoptosis susceptibility (CSE1L/CAS) protein expression promotes protrusion extension and enhances migration of MCF-7 breast cancer cells. Exp Cell Res 2010; 316:2969-81. [DOI: 10.1016/j.yexcr.2010.07.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 07/22/2010] [Accepted: 07/29/2010] [Indexed: 11/24/2022]
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Wang C, Zhou J, Wang S, Ye M, Jiang C, Fan G, Zou H. Combined Comparative and Chemical Proteomics on the Mechanisms of levo-Tetrahydropalmatine-Induced Antinociception in the Formalin Test. J Proteome Res 2010; 9:3225-34. [DOI: 10.1021/pr1001274] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Chen Wang
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Jiangrui Zhou
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Shuowen Wang
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Mingliang Ye
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Chunlei Jiang
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Guorong Fan
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
| | - Hanfa Zou
- Department of Pharmaceutical Analysis, School of Pharmacy, Second Military Medical University, No.325 Guohe Road, Shanghai 200433, People's Republic of China, Division of Biotechnology, Dalian Institute of Chemical Physics, CAS, No.457 Zhongshan Road, Dalian 116023, People's Republic of China, Laboratory of Stress Medicine, Department of Nautical Medicine, Second Military Medical University, No.800 Xiangyin Road, Shanghai 200433, People's Republic of China, and Shanghai Key Laboratory for Pharmaceutical
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Da Silva N, Pisitkun T, Belleannée C, Miller LR, Nelson R, Knepper MA, Brown D, Breton S. Proteomic analysis of V-ATPase-rich cells harvested from the kidney and epididymis by fluorescence-activated cell sorting. Am J Physiol Cell Physiol 2010; 298:C1326-42. [PMID: 20181927 DOI: 10.1152/ajpcell.00552.2009] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Proton-transporting cells are located in several tissues where they acidify the extracellular environment. These cells express the vacuolar H(+)-ATPase (V-ATPase) B1 subunit (ATP6V1B1) in their plasma membrane. We provide here a comprehensive catalog of the proteins that are expressed in these cells, after their isolation by enzymatic digestion and fluorescence-activated cell sorting (FACS) from transgenic B1-enhanced green fluorescent protein (EGFP) mice. In these mice, type A and B intercalated cells and connecting segment cells of the kidney, and narrow and clear cells of the epididymis, which all express ATP6V1B1, also express EGFP, while all other cell types are negative. The proteome of renal and epididymal EGFP-positive (EGFP(+)) cells was identified by liquid chromatography-tandem mass spectrometry (LC-MS/MS) and compared with their respective EGFP-negative (EGFP(-)) cell populations. A total of 2,297 and 1,564 proteins were detected in EGFP(+) cells from the kidney and epididymis, respectively. Out of these proteins, 202 and 178 were enriched by a factor greater than 1.5 in EGFP(+) cells compared with EGFP(-) cells, in the kidney and epididymis respectively, and included subunits of the V-ATPase (B1, a4, and A). In addition, several proteins involved in intracellular trafficking, signaling, and cytoskeletal dynamics were identified. A novel common protein that was enriched in renal and epididymal EGFP(+) cells is the progesterone receptor, which might be a potential candidate for the regulation of V-ATPase-dependent proton transport. These proteomic databases provide a framework for comprehensive future analysis of the common and distinct functions of V-ATPase-B1-expressing cells in the kidney and epididymis.
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Suzuki K, Kawakami F, Sasaki H, Maruyama H, Ohtsuki K. Biochemical characterization of tau protein and its associated syndapin 1 and protein kinase Cepsilon for their functional regulation in rat brain. Biochim Biophys Acta Gen Subj 2008; 1790:188-97. [PMID: 19101610 DOI: 10.1016/j.bbagen.2008.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Revised: 11/24/2008] [Accepted: 11/25/2008] [Indexed: 11/27/2022]
Abstract
BACKGROUND We recently reported that both sulfatide and cholesterol-3-sulfate (SCS) function as potent stimulators for the GSK-3beta-mediated phosphorylation of tau protein (TP) in vitro [J. Biochem. 143 (2008) 359-367]. METHODS By means of successive gel filtration on a Superdex 200 pg column and three distinct ion-exchange column chromatographies, TP and its associated proteins were highly purified from the extract of rat brain. RESULTS We found that (i) syndapin 1 and novel protein kinase Cepsilon (nPKCepsilon) were identified as the TP-associated proteins; (ii) SCS highly stimulated the phosphorylation of TP and syndapin 1 by nPKCepsilon as well as CK1; (iii) the full phosphorylation of TP and syndapin 1 by nPKCepsilon in the presence of sulfatide resulted in their dissociation; (iv) TP primed by CK1 functioned as an effective phosphate acceptor for GSK-3beta; (v) syndapin 1 highly stimulated the GSK-3beta-mediated phosphorylation of TP; and (vi) TP isoforms were highly expressed in aged brain, whereas syndapin 1 was consistently detected in adult brain, but not in newborn brain. GENERAL SIGNIFICANCE These results provided here suggest that (i) TP-associated nPKCepsilon suppresses the GSK-3beta-mediated phosphorylation of TP through the phosphorylation of GSK-3beta by the kinase in vitro; and (ii) SCS act as effective sole mediators to induce the GSK-3beta-mediated high phosphorylation of both TP and its associated syndapin 1 involved in the biochemical processes of neuronal diseases, including Alzheimer's disease.
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Affiliation(s)
- Kanzo Suzuki
- Laboratory of Molecular Signal Biology, Graduate School of Medical Sciences, Kitasato University, Sagamihara 228-8555, Japan
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