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Johnson AM, Jose S, Palakkott AR, Khan FB, Jayabalan N, Kizhakkayil J, AlNaqbi SAA, Scott MG, Ayoub MA, Gordon R, Saminathan H. Pharmacological Inhibition of PTEN Rescues Dopaminergic Neurons by Attenuating Apoptotic and Neuroinflammatory Signaling Events. J Neuroimmune Pharmacol 2023; 18:462-475. [PMID: 37589761 DOI: 10.1007/s11481-023-10077-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 06/16/2023] [Indexed: 08/18/2023]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by the selective degeneration of dopaminergic neurons in the substantia nigra pars compacta resulting in an irreversible and a debilitating motor dysfunction. Though both genetic and idiopathic factors are implicated in the disease etiology, idiopathic PD comprise the majority of clinical cases and is caused by exposure to environmental toxicants and oxidative stress. Fyn kinase activation has been identified as an early molecular signaling event that primes neuroinflammatory and neurodegenerative events associated with dopaminergic cell death. However, the upstream regulator of Fyn activation remains unidentified. We investigated whether the lipid and tyrosine phosphatase PTEN (Phosphatase and Tensin homolog deleted on chromosome 10) could be the upstream regulator of Fyn activation in PD models as PTEN has been previously reported to contribute to Parkinsonian pathology. Our findings, using bioluminescence resonance energy transfer (BRET) and immunoblotting, indicate for the first time that PTEN is a critical early stress sensor in response to oxidative stress and neurotoxicants in in vitro models of PD. Pharmacological attenuation of PTEN activity rescues dopaminergic neurons from neurotoxicant-induced cytotoxicity by modulating Fyn kinase activation. Our findings also identify PTEN's novel roles in contributing to mitochondrial dysfunction which contribute to neurodegenerative processes. Interestingly, we found that PTEN positively regulates interleukin-1β (IL-1β) and the transcription of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB). Taken together, we have identified PTEN as a disease course altering pharmacological target that may be further validated for the development of novel therapeutic strategies targeting PD.
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Affiliation(s)
- Aishwarya Mary Johnson
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE.
- Centre for Microbiome Research, School of Biomedical Science, Translational Research Institute, Queensland University of Technology, Brisbane, 4102, Australia.
| | - Sara Jose
- Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Abdul Rasheed Palakkott
- Department of Biology, College of Science, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
| | - Farheen Badrealam Khan
- Department of Biology, College of Science, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
| | - Nanthini Jayabalan
- Centre for Microbiome Research, School of Biomedical Science, Translational Research Institute, Queensland University of Technology, Brisbane, 4102, Australia
- Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Jaleel Kizhakkayil
- Department of Nutrition and Health, College of Medical and Health Sciences, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
| | - Shamma Abdulla Ali AlNaqbi
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
| | - Mark Gh Scott
- UMR8104, Institut CochinCNRSUniversité de Paris, Inserm U1016, Paris, France
| | - Mohammed Akli Ayoub
- Department of Biology, College of Science, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
- Biology Department, College of Arts and Sciences, Khalifa University, P O Box 127788, Abu Dhabi, UAE
| | - Richard Gordon
- Centre for Microbiome Research, School of Biomedical Science, Translational Research Institute, Queensland University of Technology, Brisbane, 4102, Australia
- Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Hariharan Saminathan
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, The United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
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2
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Electron transfer in protein modifications: from detection to imaging. Sci China Chem 2023. [DOI: 10.1007/s11426-022-1417-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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3
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Fedorova O, Parfenyev S, Daks A, Shuvalov O, Barlev NA. The Role of PTEN in Epithelial–Mesenchymal Transition. Cancers (Basel) 2022; 14:cancers14153786. [PMID: 35954450 PMCID: PMC9367281 DOI: 10.3390/cancers14153786] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 07/31/2022] [Accepted: 08/02/2022] [Indexed: 11/23/2022] Open
Abstract
Simple Summary The PTEN phosphatase is a ubiquitously expressed tumor suppressor, which inhibits the PI3K/AKT pathway in the cell. The PI3K/AKT pathway is considered to be one of the main signaling pathways that drives the proliferation of cancer cells. Furthermore, the same pathway controls the epithelial–mesenchymal transition (EMT). EMT is an evolutionarily conserved developmental program, which, upon aberrant reactivation, is also involved in the formation of cancer metastases. Importantly, metastasis is the leading cause of cancer-associated deaths. In this review, we discuss the literature data that highlight the role of PTEN in EMT. Based on this knowledge, we speculate about new possible strategies for cancer treatment. Abstract Phosphatase and Tensin Homolog deleted on Chromosome 10 (PTEN) is one of the critical tumor suppressor genes and the main negative regulator of the PI3K pathway. PTEN is frequently found to be inactivated, either partially or fully, in various malignancies. The PI3K/AKT pathway is considered to be one of the main signaling cues that drives the proliferation of cells. Perhaps it is not surprising, then, that this pathway is hyperactivated in highly proliferative tumors. Importantly, the PI3K/AKT pathway also coordinates the epithelial–mesenchymal transition (EMT), which is pivotal for the initiation of metastases and hence is regarded as an attractive target for the treatment of metastatic cancer. It was shown that PTEN suppresses EMT, although the exact mechanism of this effect is still not fully understood. This review is an attempt to systematize the published information on the role of PTEN in the development of malignant tumors, with a main focus on the regulation of the PI3K/AKT pathway in EMT.
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The RanBP2/RanGAP1-SUMO complex gates β-arrestin2 nuclear entry to regulate the Mdm2-p53 signaling axis. Oncogene 2021; 40:2243-2257. [PMID: 33649538 DOI: 10.1038/s41388-021-01704-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 01/31/2023]
Abstract
Mdm2 antagonizes the tumor suppressor p53. Targeting the Mdm2-p53 interaction represents an attractive approach for the treatment of cancers with functional p53. Investigating mechanisms underlying Mdm2-p53 regulation is therefore important. The scaffold protein β-arrestin2 (β-arr2) regulates tumor suppressor p53 by counteracting Mdm2. β-arr2 nucleocytoplasmic shuttling displaces Mdm2 from the nucleus to the cytoplasm resulting in enhanced p53 signaling. β-arr2 is constitutively exported from the nucleus, via a nuclear export signal, but mechanisms regulating its nuclear entry are not completely elucidated. β-arr2 can be SUMOylated, but no information is available on how SUMO may regulate β-arr2 nucleocytoplasmic shuttling. While we found β-arr2 SUMOylation to be dispensable for nuclear import, we identified a non-covalent interaction between SUMO and β-arr2, via a SUMO interaction motif (SIM), that is required for β-arr2 cytonuclear trafficking. This SIM promotes association of β-arr2 with the multimolecular RanBP2/RanGAP1-SUMO nucleocytoplasmic transport hub that resides on the cytoplasmic filaments of the nuclear pore complex. Depletion of RanBP2/RanGAP1-SUMO levels result in defective β-arr2 nuclear entry. Mutation of the SIM inhibits β-arr2 nuclear import, its ability to delocalize Mdm2 from the nucleus to the cytoplasm and enhanced p53 signaling in lung and breast tumor cell lines. Thus, a β-arr2 SIM nuclear entry checkpoint, coupled with active β-arr2 nuclear export, regulates its cytonuclear trafficking function to control the Mdm2-p53 signaling axis.
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Alexander RA, Lot I, Saha K, Abadie G, Lambert M, Decosta E, Kobayashi H, Beautrait A, Borrull A, Asnacios A, Bouvier M, Scott MGH, Marullo S, Enslen H. Beta-arrestins operate an on/off control switch for focal adhesion kinase activity. Cell Mol Life Sci 2020; 77:5259-5279. [PMID: 32040695 PMCID: PMC11104786 DOI: 10.1007/s00018-020-03471-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 01/13/2020] [Accepted: 01/24/2020] [Indexed: 12/20/2022]
Abstract
Focal adhesion kinase (FAK) regulates key biological processes downstream of G protein-coupled receptors (GPCRs) in normal and cancer cells, but the modes of kinase activation by these receptors remain unclear. We report that after GPCR stimulation, FAK activation is controlled by a sequence of events depending on the scaffolding proteins β-arrestins and G proteins. Depletion of β-arrestins results in a marked increase in FAK autophosphorylation and focal adhesion number. We demonstrate that β-arrestins interact directly with FAK and inhibit its autophosphorylation in resting cells. Both FAK-β-arrestin interaction and FAK inhibition require the FERM domain of FAK. Following the stimulation of the angiotensin receptor AT1AR and subsequent translocation of the FAK-β-arrestin complex to the plasma membrane, β-arrestin interaction with the adaptor AP-2 releases inactive FAK from the inhibitory complex, allowing its activation by receptor-stimulated G proteins and activation of downstream FAK effectors. Release and activation of FAK in response to angiotensin are prevented by an AP-2-binding deficient β-arrestin and by a specific inhibitor of β-arrestin/AP-2 interaction; this inhibitor also prevents FAK activation in response to vasopressin. This previously unrecognized mechanism of FAK regulation involving a dual role of β-arrestins, which inhibit FAK in resting cells while driving its activation at the plasma membrane by GPCR-stimulated G proteins, opens new potential therapeutic perspectives in cancers with up-regulated FAK.
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Affiliation(s)
- Revu Ann Alexander
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Isaure Lot
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Kusumika Saha
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Guillaume Abadie
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Mireille Lambert
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Eleonore Decosta
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Hiroyuki Kobayashi
- Department of Biochemistry and the Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Alexandre Beautrait
- Department of Biochemistry and the Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Aurélie Borrull
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Atef Asnacios
- Laboratoire Matière et Systèmes Complexes, CNRS UMR 7057, Université de Paris, Paris, France
| | - Michel Bouvier
- Department of Biochemistry and the Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Mark G H Scott
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Stefano Marullo
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France
| | - Hervé Enslen
- Institut Cochin, Inserm U 1016, CNRS UMR8104, Université de Paris, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
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Weihs F, Wang J, Pfleger KDG, Dacres H. Experimental determination of the bioluminescence resonance energy transfer (BRET) Förster distances of NanoBRET and red-shifted BRET pairs. Anal Chim Acta X 2020; 6:100059. [PMID: 33392495 PMCID: PMC7772631 DOI: 10.1016/j.acax.2020.100059] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/08/2020] [Accepted: 08/30/2020] [Indexed: 01/07/2023] Open
Abstract
Bioluminescence Resonance Energy Transfer (BRET) is widely applied to study protein-protein interactions, as well as increasingly to monitor both ligand binding and molecular rearrangements. The Förster distance (R0) describes the physical distance between the two chromophores at which 50% of the maximal energy transfer occurs and it depends on the choice of RET components. R0 can be experimentally determined using flexible peptide linkers of known lengths to separate the two chromophores. Knowledge of the R0 helps to inform on the choice of BRET system. For example, we have previously shown that BRET2 exhibits the largest R0 to date for any genetically encoded RET pair, which may be advantageous for investigating large macromolecular complexes if its issues of low and fast-decaying bioluminescence signal can be accommodated. In this study we have determined R0 for a range of bright and red-shifted BRET pairs, including NanoBRET with tetramethylrhodamine (TMR), non-chloro TOM (NCT), mCherry or Venus as acceptor, and BRET6, a red-shifted BRET2-like system. This study revealed R0 values of 6.15 nm and 6.94 nm for NanoBRET using TMR or NCT as acceptor ligands, respectively. R0 was 5.43 nm for NanoLuc-mCherry, 5.59 nm for NanoLuc-Venus and 5.47 nm for BRET6. This extends the palette of available BRET Förster distances, to give researchers a better-informed choice when considering BRET systems and points towards NanoBRET with NCT as a good alternative to BRET2 as an analysis tool for large macromolecular complexes. Experimental determination of Förster distances (R0) for commonly applied BRET pairs. Determination of R0 for NanoBRET with Venus, mCherry and HaloTag (TMR, NCT). Determination of R0 for BRET6. NanoLuc-HaloTag (NCT) exhibits the second largest R0 of any genetically encoded system.
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Affiliation(s)
- Felix Weihs
- CSIRO Health & Biosecurity, Parkville, 343 Royal Parade, Melbourne, VIC, 3030, Australia
| | - Jian Wang
- CSIRO Health & Biosecurity, Canberra, ACT, 2601, Australia
| | - Kevin D G Pfleger
- Harry Perkins Institute of Medical Research and Centre for Medical Research, The University of Western Australia, Nedlands, Perth, WA, 6009, Australia.,Australian Research Council Centre for Personalised Therapeutics Technologies, Australia.,Dimerix Limited, Nedlands, WA, Australia
| | - Helen Dacres
- CSIRO Health & Biosecurity, Food Innovation Centre, 671 Sneydes Road, Werribee, VIC, 3030, Australia
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Posttranslational Regulation and Conformational Plasticity of PTEN. Cold Spring Harb Perspect Med 2020; 10:cshperspect.a036095. [PMID: 31932468 DOI: 10.1101/cshperspect.a036095] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a tumor suppressor that is frequently down-modulated in human cancer. PTEN inhibits the phosphatidylinositol 3-phosphate kinase (PI3K)/AKT pathway through its lipid phosphatase activity. Multiple PI3K/AKT-independent actions of PTEN, protein-phosphatase activities and functions within the nucleus have also been described. PTEN, therefore, regulates many cellular processes including cell proliferation, survival, genomic integrity, polarity, migration, and invasion. Even a modest decrease in the functional dose of PTEN may promote cancer development. Understanding the molecular and cellular mechanisms that regulate PTEN protein levels and function, and how these may go awry in cancer contexts, is, therefore, key to fully understanding the role of PTEN in tumorigenesis. Here, we discuss current knowledge on posttranslational control and conformational plasticity of PTEN, as well as therapeutic possibilities toward reestablishment of PTEN tumor-suppressor activity in cancer.
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8
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Fabrication of the Ni/ZnO/BiOI foam for the improved electrochemical biosensing performance to glucose. Anal Chim Acta 2020; 1095:93-98. [PMID: 31864634 DOI: 10.1016/j.aca.2019.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 10/15/2019] [Accepted: 10/16/2019] [Indexed: 12/23/2022]
Abstract
The Ni foam decorated with ZnO/BiOI core-shell p-n junction nanorods was prepared and employed as an enzyme loading matrix to detect glucose. The detection potential was decreased significantly (0.3 V) and the sensitivity was enhanced largely (115.2 μA mM-1 cm-2). The metal-semiconductor foam can afford the porous surface for loading enzymes and achieving the multiple catalysis. More important, the built-in electric field and electron well in the p-n junction interface provide the driving force for electron transport. It was an effective strategy to enhance the biosensing performance by the rational design of p-n junction.
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Go M, Choi H, Kim KY, Moon CJ, Choi Y, Miyake H, Lee SS, Jung SH, Choi MY, Jung JH. Temperature-controlled helical inversion of asymmetric triphenylamine-based supramolecular polymers; difference of handedness at the micro- and macroscopic levels. Org Chem Front 2019. [DOI: 10.1039/c9qo00051h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The M-helicity of asymmetric N-triphenylamine-based supramolecular polymers was inverted to the P-helicity during heating.
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Affiliation(s)
- Misun Go
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Heekyoung Choi
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Ka Young Kim
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Cheol Joo Moon
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Yeonweon Choi
- Accident Prevention and Assessment Division 2
- National Institute of Chemical Safety
- Daejeon 34111
- South Korea
| | - Hiroyuki Miyake
- Department of Chemistry
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
| | - Shim Sung Lee
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Sung Ho Jung
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Myong Yong Choi
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
| | - Jong Hwa Jung
- Department of Chemistry and Research Institute of Natural Sciences
- Gyeongsang National University
- Jinju 52828
- South Korea
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Greenwald EC, Mehta S, Zhang J. Genetically Encoded Fluorescent Biosensors Illuminate the Spatiotemporal Regulation of Signaling Networks. Chem Rev 2018; 118:11707-11794. [PMID: 30550275 PMCID: PMC7462118 DOI: 10.1021/acs.chemrev.8b00333] [Citation(s) in RCA: 302] [Impact Index Per Article: 50.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Cellular signaling networks are the foundation which determines the fate and function of cells as they respond to various cues and stimuli. The discovery of fluorescent proteins over 25 years ago enabled the development of a diverse array of genetically encodable fluorescent biosensors that are capable of measuring the spatiotemporal dynamics of signal transduction pathways in live cells. In an effort to encapsulate the breadth over which fluorescent biosensors have expanded, we endeavored to assemble a comprehensive list of published engineered biosensors, and we discuss many of the molecular designs utilized in their development. Then, we review how the high temporal and spatial resolution afforded by fluorescent biosensors has aided our understanding of the spatiotemporal regulation of signaling networks at the cellular and subcellular level. Finally, we highlight some emerging areas of research in both biosensor design and applications that are on the forefront of biosensor development.
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Affiliation(s)
- Eric C Greenwald
- University of California , San Diego, 9500 Gilman Drive, BRFII , La Jolla , CA 92093-0702 , United States
| | - Sohum Mehta
- University of California , San Diego, 9500 Gilman Drive, BRFII , La Jolla , CA 92093-0702 , United States
| | - Jin Zhang
- University of California , San Diego, 9500 Gilman Drive, BRFII , La Jolla , CA 92093-0702 , United States
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Jiang YL, Zhu Y, Moore AB, Miller K, Broome AM. Biotinylated Bioluminescent Probe for Long Lasting Targeted in Vivo Imaging of Xenografted Brain Tumors in Mice. ACS Chem Neurosci 2018; 9:100-106. [PMID: 28532151 PMCID: PMC5947857 DOI: 10.1021/acschemneuro.7b00111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Bioluminescence is a useful tool for imaging of cancer in in vivo animal models that endogenously express luciferase, an enzyme that requires a substrate for visual readout. Current bioluminescence imaging, using commonly available luciferin substrates, only lasts a short time (15-20 min). To avoid repeated administration of luciferase substrate during cancer detection and surgery, a long lasting bioluminescence imaging substrate or system is needed. A novel water-soluble biotinylated luciferase probe, B-YL (1), was synthesized. A receptor-targeted complex of B-YL with streptavidin (SA) together with a biotinylated epidermal growth factor short peptide (B-EGF) (SA/B-YL/B-EGF = 1:3:1, molar ratio) was then prepared to demonstrate selective targeting. The complex was incubated with brain cancer cell lines overexpressing the EGF receptor (EGFR) and transfected with the luciferase gene. Results show that the complex specifically detects cancer cells by bioluminescence. The complex was further used to image xenograft brain tumors transfected with a luciferase gene in mice. The complex detects the tumor immediately, and bioluminescence lasts for 5 days. Thus, the complex generates a long lasting bioluminescence for cancer detection in mice. The complex with selective targeting may be used in noninvasive cancer diagnosis and accurate surgery in cancer treatment in clinics in the future.
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Affiliation(s)
- Yu Lin Jiang
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Yun Zhu
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Alfred B. Moore
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, United States
- Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Kayla Miller
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Ann-Marie Broome
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, United States
- Neurosciences, Medical University of South Carolina, Charleston, South Carolina 29425, United States
- Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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Targeting PTEN in Colorectal Cancers. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1110:55-73. [DOI: 10.1007/978-3-030-02771-1_5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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13
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Javadi A, Deevi RK, Evergren E, Blondel-Tepaz E, Baillie GS, Scott MGH, Campbell FC. PTEN controls glandular morphogenesis through a juxtamembrane β-Arrestin1/ARHGAP21 scaffolding complex. eLife 2017; 6:e24578. [PMID: 28749339 PMCID: PMC5576923 DOI: 10.7554/elife.24578] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 07/24/2017] [Indexed: 01/01/2023] Open
Abstract
PTEN controls three-dimensional (3D) glandular morphogenesis by coupling juxtamembrane signaling to mitotic spindle machinery. While molecular mechanisms remain unclear, PTEN interacts through its C2 membrane-binding domain with the scaffold protein β-Arrestin1. Because β-Arrestin1 binds and suppresses the Cdc42 GTPase-activating protein ARHGAP21, we hypothesize that PTEN controls Cdc42 -dependent morphogenic processes through a β-Arrestin1-ARHGAP21 complex. Here, we show that PTEN knockdown (KD) impairs β-Arrestin1 membrane localization, β-Arrestin1-ARHGAP21 interactions, Cdc42 activation, mitotic spindle orientation and 3D glandular morphogenesis. Effects of PTEN deficiency were phenocopied by β-Arrestin1 KD or inhibition of β-Arrestin1-ARHGAP21 interactions. Conversely, silencing of ARHGAP21 enhanced Cdc42 activation and rescued aberrant morphogenic processes of PTEN-deficient cultures. Expression of the PTEN C2 domain mimicked effects of full-length PTEN but a membrane-binding defective mutant of the C2 domain abrogated these properties. Our results show that PTEN controls multicellular assembly through a membrane-associated regulatory protein complex composed of β-Arrestin1, ARHGAP21 and Cdc42.
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Affiliation(s)
- Arman Javadi
- Centre for Cancer Research and Cell BiologyQueen’s University of BelfastBelfastUnited Kingdom
| | - Ravi K Deevi
- Centre for Cancer Research and Cell BiologyQueen’s University of BelfastBelfastUnited Kingdom
| | - Emma Evergren
- Centre for Cancer Research and Cell BiologyQueen’s University of BelfastBelfastUnited Kingdom
| | - Elodie Blondel-Tepaz
- Inserm, U1016, Institut CochinParisFrance
- CNRS, UMR8104ParisFrance
- Univ. Paris Descartes, Sorbonne Paris CitéParisFrance
| | - George S Baillie
- Institute of Cardiovascular and Medical Science, College of Medical, Veterinary and Life SciencesUniversity of GlasgowGlasgowScotland
| | - Mark GH Scott
- Inserm, U1016, Institut CochinParisFrance
- CNRS, UMR8104ParisFrance
- Univ. Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Frederick C Campbell
- Centre for Cancer Research and Cell BiologyQueen’s University of BelfastBelfastUnited Kingdom
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Conway JRW, Warren SC, Timpson P. Context-dependent intravital imaging of therapeutic response using intramolecular FRET biosensors. Methods 2017; 128:78-94. [PMID: 28435000 DOI: 10.1016/j.ymeth.2017.04.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 03/13/2017] [Accepted: 04/08/2017] [Indexed: 12/18/2022] Open
Abstract
Intravital microscopy represents a more physiologically relevant method for assessing therapeutic response. However, the movement into an in vivo setting brings with it several additional considerations, the primary being the context in which drug activity is assessed. Microenvironmental factors, such as hypoxia, pH, fibrosis, immune infiltration and stromal interactions have all been shown to have pronounced effects on drug activity in a more complex setting, which is often lost in simpler two- or three-dimensional assays. Here we present a practical guide for the application of intravital microscopy, looking at the available fluorescent reporters and their respective expression systems and analysis considerations. Moving in vivo, we also discuss the microscopy set up and methods available for overlaying microenvironmental context to the experimental readouts. This enables a smooth transition into applying higher fidelity intravital imaging to improve the drug discovery process.
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Affiliation(s)
- James R W Conway
- Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Cancer Division, Sydney, NSW 2010, Australia; St Vincent's Clinical School, Faculty of Medicine, University of NSW, Sydney, NSW 2010, Australia
| | - Sean C Warren
- Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Cancer Division, Sydney, NSW 2010, Australia; St Vincent's Clinical School, Faculty of Medicine, University of NSW, Sydney, NSW 2010, Australia
| | - Paul Timpson
- Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Cancer Division, Sydney, NSW 2010, Australia; St Vincent's Clinical School, Faculty of Medicine, University of NSW, Sydney, NSW 2010, Australia.
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15
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Schaub FX, Reza MS, Flaveny CA, Li W, Musicant AM, Hoxha S, Guo M, Cleveland JL, Amelio AL. Fluorophore-NanoLuc BRET Reporters Enable Sensitive In Vivo Optical Imaging and Flow Cytometry for Monitoring Tumorigenesis. Cancer Res 2015; 75:5023-33. [PMID: 26424696 DOI: 10.1158/0008-5472.can-14-3538] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 08/28/2015] [Indexed: 01/06/2023]
Abstract
Fluorescent proteins are widely used to study molecular and cellular events, yet this traditionally relies on delivery of excitation light, which can trigger autofluorescence, photoxicity, and photobleaching, impairing their use in vivo. Accordingly, chemiluminescent light sources such as those generated by luciferases have emerged, as they do not require excitation light. However, current luciferase reporters lack the brightness needed to visualize events in deep tissues. We report the creation of chimeric eGFP-NanoLuc (GpNLuc) and LSSmOrange-NanoLuc (OgNLuc) fusion reporter proteins coined LumiFluors, which combine the benefits of eGFP or LSSmOrange fluorescent proteins with the bright, glow-type bioluminescent light generated by an enhanced small luciferase subunit (NanoLuc) of the deep-sea shrimp Oplophorus gracilirostris. The intramolecular bioluminescence resonance energy transfer that occurs between NanoLuc and the fused fluorophore generates the brightest bioluminescent signal known to date, including improved intensity, sensitivity, and durable spectral properties, thereby dramatically reducing image acquisition times and permitting highly sensitive in vivo imaging. Notably, the self-illuminating and bifunctional nature of these LumiFluor reporters enables greatly improved spatiotemporal monitoring of very small numbers of tumor cells via in vivo optical imaging and also allows the isolation and analyses of single cells by flow cytometry. Thus, LumiFluor reporters are inexpensive, robust, noninvasive tools that allow for markedly improved in vivo optical imaging of tumorigenic processes.
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Affiliation(s)
- Franz X Schaub
- Department of Tumor Biology, Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Md Shamim Reza
- Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, Florida
| | - Colin A Flaveny
- Department of Pharmacological & Physiological Science, School of Medicine, Saint Louis University, St. Louis, Missouri
| | - Weimin Li
- Department of Tumor Biology, Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Adele M Musicant
- UNC Biological and Biomedical Sciences Graduate Program, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Sany Hoxha
- Scripps Graduate Program, The Scripps Research Institute, Scripps Florida, Jupiter, Florida
| | - Min Guo
- Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, Florida
| | - John L Cleveland
- Department of Tumor Biology, Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Antonio L Amelio
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
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16
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Feng C, Ding HM, Ren CL, Ma YQ. Designing new strategy for controlling DNA orientation in biosensors. Sci Rep 2015; 5:14415. [PMID: 26400770 PMCID: PMC4585838 DOI: 10.1038/srep14415] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 08/27/2015] [Indexed: 01/04/2023] Open
Abstract
Orientation controllable DNA biosensors hold great application potentials in recognizing small molecules and detecting DNA hybridization. Though electric field is usually used to control the orientation of DNA molecules, it is also of great importance and significance to seek for other triggered methods to control the DNA orientation. Here, we design a new strategy for controlling DNA orientation in biosensors. The main idea is to copolymerize DNA molecules with responsive polymers that can show swelling/deswelling transitions due to the change of external stimuli, and then graft the copolymers onto an uncharged substrate. In order to highlight the responsive characteristic, we take thermo-responsive polymers as an example, and reveal multi-responsive behavior and the underlying molecular mechanism of the DNA orientation by combining dissipative particle dynamics simulation and molecular theory. Since swelling/deswelling transitions can be also realized by using other stimuli-responsive (like pH and light) polymers, the present strategy is universal, which can enrich the methods of controlling DNA orientation and may assist with the design of the next generation of biosensors.
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Affiliation(s)
- Chao Feng
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Hong-ming Ding
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.,Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
| | - Chun-lai Ren
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Yu-qiang Ma
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.,Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
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17
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Nguyen HN, Yang JM, Miyamoto T, Itoh K, Rho E, Zhang Q, Inoue T, Devreotes PN, Sesaki H, Iijima M. Opening the conformation is a master switch for the dual localization and phosphatase activity of PTEN. Sci Rep 2015. [PMID: 26216063 PMCID: PMC4517176 DOI: 10.1038/srep12600] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Tumor suppressor PTEN mainly functions at two subcellular locations, the plasma membrane and the nucleus. At the plasma membrane, PTEN dephosphorylates the tumorigenic second messenger PIP3, which drives cell proliferation and migration. In the nucleus, PTEN controls DNA repair and genome stability independently of PIP3. Whereas the concept that a conformational change regulates protein function through post-translational modifications has been well established in biology, it is unknown whether a conformational change simultaneously controls dual subcellular localizations of proteins. Here, we discovered that opening the conformation of PTEN is the crucial upstream event that determines its key dual localizations of this crucial tumor suppressor. We identify a critical conformational switch that regulates PTEN's localization. Most PTEN molecules are held in the cytosol in a closed conformation by intramolecular interactions between the C-terminal tail and core region. Dephosphorylation of the tail opens the conformation and exposes the membrane-binding regulatory interface in the core region, recruiting PTEN to the membrane. Moreover, a lysine at residue 13 is also exposed and when ubiquitinated, transports PTEN to the nucleus. Thus, opening the conformation of PTEN is a key mechanism that enhances its dual localization and enzymatic activity, providing a potential therapeutic strategy in cancer treatments.
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Affiliation(s)
- Hoai-Nghia Nguyen
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jr-Ming Yang
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Takafumi Miyamoto
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Kie Itoh
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Elmer Rho
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Qiang Zhang
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Takanari Inoue
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Peter N Devreotes
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Hiromi Sesaki
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Miho Iijima
- Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, MD
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18
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Marchi S, Pinton P. Molecular Characterization of the Dominant-Negative Role of Cancer-Associated PTEN: Sometimes, Null is Better. Front Oncol 2014; 4:276. [PMID: 25346911 PMCID: PMC4193253 DOI: 10.3389/fonc.2014.00276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 09/22/2014] [Indexed: 11/13/2022] Open
Affiliation(s)
- Saverio Marchi
- Laboratory for Technologies of Advanced Therapies (LTTA), Section of Pathology, Oncology and Experimental Biology, Department of Morphology, Surgery and Experimental Medicine, University of Ferrara , Ferrara , Italy
| | - Paolo Pinton
- Laboratory for Technologies of Advanced Therapies (LTTA), Section of Pathology, Oncology and Experimental Biology, Department of Morphology, Surgery and Experimental Medicine, University of Ferrara , Ferrara , Italy
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