1
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Kenworthy CA, Haque N, Liou SH, Chandris P, Wong V, Dziuba P, Lavis LD, Liu WL, Singer RH, Coleman RA. Bromodomains regulate dynamic targeting of the PBAF chromatin-remodeling complex to chromatin hubs. Biophys J 2022; 121:1738-1752. [PMID: 35364106 PMCID: PMC9117891 DOI: 10.1016/j.bpj.2022.03.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/20/2021] [Accepted: 03/24/2022] [Indexed: 11/12/2022] Open
Abstract
Chromatin remodelers actively target arrays of acetylated nucleosomes at select enhancers and promoters to facilitate or shut down the repeated recruitment of RNA polymerase II during transcriptional bursting. It is poorly understood how chromatin remodelers such as PBAF dynamically target different chromatin states inside a live cell. Our live-cell single-molecule fluorescence microscopy study reveals chromatin hubs throughout the nucleus where PBAF rapidly cycles on and off the genome. Deletion of PBAF's bromodomains impairs targeting and stable engagement of chromatin in hubs. Dual color imaging reveals that PBAF targets both euchromatic and heterochromatic hubs with distinct genome-binding kinetic profiles that mimic chromatin stability. Removal of PBAF's bromodomains stabilizes H3.3 binding within chromatin, indicating that bromodomains may play a direct role in remodeling of the nucleosome. Our data suggests that PBAF's dynamic bromodomain-mediated engagement of a nucleosome may reflect the chromatin-remodeling potential of differentially bound chromatin states.
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Affiliation(s)
- Charles A. Kenworthy
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Nayem Haque
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Shu-Hao Liou
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Panagiotis Chandris
- Section on High Resolution Optical Imaging, National Institute on Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland
| | - Vincent Wong
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Patrycja Dziuba
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Luke D. Lavis
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia
| | - Wei-Li Liu
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York
| | - Robert H. Singer
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York,Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia
| | - Robert A. Coleman
- Gruss-Lipper Biophotonics Center, Department of Cell Biology, Albert Einstein College of Medicine, New York,Corresponding author
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2
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Prodanovic V, Jamali B, Kuller M, Wang Y, Bach PM, Coleman RA, Metzeling L, McCarthy DT, Shi B, Deletic A. Calibration and sensitivity analysis of a novel water flow and pollution model for future city planning: Future Urban Stormwater Simulation (FUSS). Water Sci Technol 2022; 85:961-969. [PMID: 35228347 DOI: 10.2166/wst.2022.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Planning for future urban development and water infrastructure is uncertain due to changing human activities and climate. To quantify these changes, we need adaptable and fast models that can reliably explore scenarios without requiring extensive data and inputs. While such models have been recently considered for urban development, they are lacking for stormwater pollution assessment. This work proposes a novel Future Urban Stormwater Simulation (FUSS) model, utilizing a previously developed urban planning algorithm (UrbanBEATS) to dynamically assess pollution changes in urban catchments. By using minimal input data and adding stochastic point-source pollution to the build-up/wash-off approach, this study highlights calibration and sensitivity analysis of flow and pollution modules, across the range of common stormwater pollutants. The results highlight excellent fit to measured values in a continuous rainfall simulation for the flow model, with one significant calibration parameter. The pollution model was more variable, with TSS, TP and Pb showing high model efficiency, while TN was predicted well only across event-based assessment. The work further explores the framework for the model application in future pollution assessment, and points to the future work aiming to developing land-use dependent model parameter sets, to achieve flexibility for model application across varied urban catchments.
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Affiliation(s)
- V Prodanovic
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia E-mail:
| | - B Jamali
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia E-mail:
| | - M Kuller
- Swiss Federal Institute of Aquatic Science & Technology (EAWAG), Überlandstrasse 133, 8600 Dübendorf, Switzerland
| | - Y Wang
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia E-mail:
| | - P M Bach
- Swiss Federal Institute of Aquatic Science & Technology (EAWAG), Überlandstrasse 133, 8600 Dübendorf, Switzerland; Institute of Environmental Engineering, ETH Zürich, 8093 Zürich, Switzerland
| | - R A Coleman
- Melbourne Water Corporation, La Trobe Street, Docklands, VIC 3008, Australia
| | - L Metzeling
- Environment Protection Authority, Macleod 3085, Victoria, Australia
| | - D T McCarthy
- Department of Civil Engineering, Monash University, Wellington Road, Clayton, Victoria 3810, Australia
| | - B Shi
- Department of Civil Engineering, Monash University, Wellington Road, Clayton, Victoria 3810, Australia
| | - A Deletic
- School of Civil and Environmental Engineering, Queensland University of Technology, Queensland 4001, Australia
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3
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Coleman RA, Donoher WJ. Looking Beyond the Dyad: How Transformational Leadership Affects Leader–Member Exchange Quality and Outcomes. J of Leadership Studies 2022. [DOI: 10.1002/jls.21792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - William J. Donoher
- Department of Management, Marketing and Logistics Georgia College & State University Milledgeville GA USA
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4
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Abstract
Within the nucleus, messenger RNA is generated and processed in a highly organized and regulated manner. Messenger RNA processing begins during transcription initiation and continues until the RNA is translated and degraded. Processes such as 5' capping, alternative splicing, and 3' end processing have been studied extensively with biochemical methods and more recently with single-molecule imaging approaches. In this review, we highlight how imaging has helped understand the highly dynamic process of RNA processing. We conclude with open questions and new technological developments that may further our understanding of RNA processing.
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Affiliation(s)
- Jeetayu Biswas
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Weihan Li
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Robert H Singer
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Robert A Coleman
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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5
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Coleman RA, Fulford MD. Socioeconomic Status and Individual Personal Responsibility Beliefs Towards Food Access. Food Ethics 2021; 7:1. [PMID: 34722856 PMCID: PMC8542496 DOI: 10.1007/s41055-021-00096-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Accepted: 10/06/2021] [Indexed: 11/28/2022]
Abstract
Despite worldwide attention given to food access, very little progress has been made under the current model. Recognizing that individual engagement is likely based on individual experiences and perceptions, this research study investigated whether or not a correlation exists between one's socioeconomic status (SES) and perceived personal responsibility for food access. Discussion of results and implications provide fresh insight into the ongoing global debate surrounding food access. Outcomes also provide insight into willing and able participants and point to least-cost solutions which may be better suited to implement and initiate change. Results indicate that the issue of food access is more complex than simply lobbying for better decision-making among individuals and populations, highlighting the importance of unit of analysis considerations.
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Affiliation(s)
- Robert A. Coleman
- College of Business, University of Findlay, 1000 N. Main St, Findlay, OH 45840 USA
| | - Mark D. Fulford
- School of Business, Economics, and Technology, Campbellsville University, 1 University Drive, Campbellsville, KY 42718 USA
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6
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Desai RV, Chen X, Martin B, Chaturvedi S, Hwang DW, Li W, Yu C, Ding S, Thomson M, Singer RH, Coleman RA, Hansen MMK, Weinberger LS. A DNA repair pathway can regulate transcriptional noise to promote cell fate transitions. Science 2021; 373:science.abc6506. [PMID: 34301855 DOI: 10.1126/science.abc6506] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 07/08/2021] [Indexed: 12/13/2022]
Abstract
Stochastic fluctuations in gene expression ("noise") are often considered detrimental, but fluctuations can also be exploited for benefit (e.g., dither). We show here that DNA base excision repair amplifies transcriptional noise to facilitate cellular reprogramming. Specifically, the DNA repair protein Apex1, which recognizes both naturally occurring and unnatural base modifications, amplifies expression noise while homeostatically maintaining mean expression levels. This amplified expression noise originates from shorter-duration, higher-intensity transcriptional bursts generated by Apex1-mediated DNA supercoiling. The remodeling of DNA topology first impedes and then accelerates transcription to maintain mean levels. This mechanism, which we refer to as "discordant transcription through repair" ("DiThR," which is pronounced "dither"), potentiates cellular reprogramming and differentiation. Our study reveals a potential functional role for transcriptional fluctuations mediated by DNA base modifications in embryonic development and disease.
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Affiliation(s)
- Ravi V Desai
- Gladstone/UCSF Center for Cell Circuitry, Gladstone Institutes, San Francisco, CA 94158, USA.,Medical Scientist Training Program and Tetrad Graduate Program, University of California, San Francisco, CA 94158, USA
| | - Xinyue Chen
- Gladstone/UCSF Center for Cell Circuitry, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Benjamin Martin
- Gladstone/UCSF Center for Cell Circuitry, Gladstone Institutes, San Francisco, CA 94158, USA.,Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, the Netherlands
| | - Sonali Chaturvedi
- Gladstone/UCSF Center for Cell Circuitry, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Dong Woo Hwang
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Weihan Li
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Chen Yu
- Gladstone Institute of Cardiovascular Disease, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Sheng Ding
- Gladstone Institute of Cardiovascular Disease, Gladstone Institutes, San Francisco, CA 94158, USA.,School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China
| | - Matt Thomson
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Robert H Singer
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Robert A Coleman
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Maike M K Hansen
- Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, the Netherlands
| | - Leor S Weinberger
- Gladstone/UCSF Center for Cell Circuitry, Gladstone Institutes, San Francisco, CA 94158, USA. .,Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158, USA.,Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158, USA
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7
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Drosopoulos WC, Vierra DA, Kenworthy CA, Coleman RA, Schildkraut CL. Dynamic Assembly and Disassembly of the Human DNA Polymerase δ Holoenzyme on the Genome In Vivo. Cell Rep 2021; 30:1329-1341.e5. [PMID: 32023453 PMCID: PMC7597369 DOI: 10.1016/j.celrep.2019.12.101] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/21/2019] [Accepted: 12/30/2019] [Indexed: 12/15/2022] Open
Abstract
Human DNA polymerase delta (Pol δ) forms a holoenzyme complex with the DNA sliding clamp proliferating cell nuclear antigen (PCNA) to perform its essential roles in genome replication. Here, we utilize live-cell single-molecule tracking to monitor Pol δ holoenzyme interaction with the genome in real time. We find holoenzyme assembly and disassembly in vivo are highly dynamic and ordered. PCNA generally loads onto the genome before Pol δ. Once assembled, the holoenzyme has a relatively short lifetime on the genome, implying multiple Pol δ binding events may be needed to synthesize an Okazaki fragment. During disassembly, Pol δ dissociation generally precedes PCNA unloading. We also find that Pol δ p125, the catalytic subunit of the holoenzyme, is maintained at a constant cellular level, indicating an active mechanism for control of Pol δ levels in vivo. Collectively, our studies reveal that Pol δ holoenzyme assembly and disassembly follow a predominant pathway in vivo; however, alternate pathways are observed. Drosopoulos et al. report human Pol δ holoenzyme assembly and disassembly on the genome in vivo are highly dynamic and ordered. They find that assembly and disassembly of the Pol δ holoenzyme complex follow a predominant pathway in vivo, with alternate pathways also observed.
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Affiliation(s)
- William C Drosopoulos
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA.
| | - David A Vierra
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA
| | - Charles A Kenworthy
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA
| | - Robert A Coleman
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA.
| | - Carl L Schildkraut
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA.
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8
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Rigano A, Ehmsen S, Öztürk SU, Ryan J, Balashov A, Hammer M, Kirli K, Boehm U, Brown CM, Bellve K, Chambers JJ, Cosolo A, Coleman RA, Faklaris O, Fogarty KE, Guilbert T, Hamacher AB, Itano MS, Keeley DP, Kunis S, Lacoste J, Laude A, Ma WY, Marcello M, Montero-Llopis P, Nelson G, Nitschke R, Pimentel JA, Weidtkamp-Peters S, Park PJ, Alver BH, Grunwald D, Strambio-De-Castillia C. Micro-Meta App: an interactive tool for collecting microscopy metadata based on community specifications. Nat Methods 2021; 18:1489-1495. [PMID: 34862503 PMCID: PMC8648560 DOI: 10.1038/s41592-021-01315-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 09/30/2021] [Indexed: 12/31/2022]
Abstract
For quality, interpretation, reproducibility and sharing value, microscopy images should be accompanied by detailed descriptions of the conditions that were used to produce them. Micro-Meta App is an intuitive, highly interoperable, open-source software tool that was developed in the context of the 4D Nucleome (4DN) consortium and is designed to facilitate the extraction and collection of relevant microscopy metadata as specified by the recent 4DN-BINA-OME tiered-system of Microscopy Metadata specifications. In addition to substantially lowering the burden of quality assurance, the visual nature of Micro-Meta App makes it particularly suited for training purposes.
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Affiliation(s)
- Alessandro Rigano
- Program in Molecular Medicine, UMass Chan Medical School, Worcester, MA USA
| | - Shannon Ehmsen
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Serkan Utku Öztürk
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Joel Ryan
- grid.14709.3b0000 0004 1936 8649Advanced BioImaging Facility (ABIF), McGill University, Montreal, Quebec Canada
| | - Alexander Balashov
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Mathias Hammer
- RNA Therapeutics Institute, UMass Chan Medical School, Worcester, MA USA
| | - Koray Kirli
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Ulrike Boehm
- grid.443970.dJanelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA USA
| | - Claire M. Brown
- grid.14709.3b0000 0004 1936 8649Advanced BioImaging Facility (ABIF), McGill University, Montreal, Quebec Canada
| | - Karl Bellve
- Program in Molecular Medicine, UMass Chan Medical School, Worcester, MA USA
| | - James J. Chambers
- grid.266683.f0000 0001 2166 5835Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA USA
| | - Andrea Cosolo
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Robert A. Coleman
- grid.251993.50000000121791997Department of Anatomy and Structural Biology, Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, Bronx, NY USA
| | - Orestis Faklaris
- grid.121334.60000 0001 2097 0141BioCampus Montpellier (BCM), University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Kevin E. Fogarty
- Program in Molecular Medicine, UMass Chan Medical School, Worcester, MA USA
| | - Thomas Guilbert
- grid.508487.60000 0004 7885 7602Institut Cochin, Inserm U1016-CNRS UMR8104-Université de Paris, Paris, France
| | - Anna B. Hamacher
- grid.411327.20000 0001 2176 9917Center for Advanced Imaging, Heinrich-Heine University Duesseldorf, Düsseldorf, Germany
| | - Michelle S. Itano
- grid.10698.360000000122483208UNC Neuroscience Microscopy Core Facility, Department of Cell Biology and Physiology, Carolina Institute for Developmental Disabilities, and UNC Neuroscience Center, University of North Carolina, Chapel Hill, NC USA
| | - Daniel P. Keeley
- grid.10698.360000000122483208UNC Neuroscience Microscopy Core Facility, Department of Cell Biology and Physiology, Carolina Institute for Developmental Disabilities, and UNC Neuroscience Center, University of North Carolina, Chapel Hill, NC USA
| | - Susanne Kunis
- grid.10854.380000 0001 0672 4366Department of Biology/Chemistry and Center for Cellular Nanoanalytics, University Osnabrück, Osnabrück, Germany
| | | | - Alex Laude
- grid.1006.70000 0001 0462 7212Bioimaging Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Willa Y. Ma
- grid.10698.360000000122483208UNC Neuroscience Microscopy Core Facility, Carolina Institute for Developmental Disabilities, and UNC Neuroscience Center, University of North Carolina, Chapel Hill, NC USA
| | - Marco Marcello
- grid.10025.360000 0004 1936 8470Center for Cell Imaging, University of Liverpool, Liverpool, UK
| | - Paula Montero-Llopis
- grid.38142.3c000000041936754XMicroscopy Resources of the North Quad, University of Harvard Medical School, Boston, MA USA
| | - Glyn Nelson
- grid.1006.70000 0001 0462 7212Bioimaging Unit, Newcastle University, Newcastle upon Tyne, UK
| | - Roland Nitschke
- grid.5963.9Life Imaging Center and Signalling Research Centres CIBSS and BIOSS, University of Freiburg, Freiburg, Germany
| | - Jaime A. Pimentel
- grid.9486.30000 0001 2159 0001Laboratorio Nacional de Microscopía Avanzada, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
| | - Stefanie Weidtkamp-Peters
- grid.411327.20000 0001 2176 9917Center for Advanced Imaging, Heinrich-Heine University Duesseldorf, Düsseldorf, Germany
| | - Peter J. Park
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - Burak H. Alver
- grid.38142.3c000000041936754XDepartment of Biomedical Informatics, Harvard Medical School, Boston, MA USA
| | - David Grunwald
- RNA Therapeutics Institute, UMass Chan Medical School, Worcester, MA USA
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9
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Woodward DF, Coleman RA, Woodrooffe AJ, Spada CS, Wang JW. Effect of the Antiglaucoma Agent JV-GL1 and Related Compounds in the Canine Eye. J Ocul Pharmacol Ther 2020; 36:636-648. [DOI: 10.1089/jop.2020.0033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- David F. Woodward
- Department of Bioengineering, Imperial College London, South Kensington, United Kingdom
- JeniVision, Inc., Irvine, California, USA
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10
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Breyer RM, Clapp L, Coleman RA, Giembycz M, Heinemann A, Hills R, Jones RL, Narumiya S, Norel X, Pettipher R, Sugimoto Y, Uddin M, Woodward DF, Yao C. Prostanoid receptors (version 2020.4) in the IUPHAR/BPS Guide to Pharmacology Database. ACTA ACUST UNITED AC 2020. [DOI: 10.2218/gtopdb/f58/2020.4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Prostanoid receptors (nomenclature as agreed by the NC-IUPHAR Subcommittee on Prostanoid Receptors [661]) are activated by the endogenous ligands prostaglandins PGD2, PGE1, PGE2 , PGF2α, PGH2, prostacyclin [PGI2] and thromboxane A2. Differences and similarities between human and rodent prostanoid receptor orthologues, and their specific roles in pathophysiologic conditions are reviewed in [423]. Measurement of the potency of PGI2 and thromboxane A2 is hampered by their instability in physiological salt solution; they are often replaced by cicaprost and U46619, respectively, in receptor characterization studies.
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11
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Park SR, Hauver J, Zhang Y, Revyakin A, Coleman RA, Tjian R, Chu S, Pertsinidis A. A Single-Molecule Surface-Based Platform to Detect the Assembly and Function of the Human RNA Polymerase II Transcription Machinery. Structure 2020; 28:1337-1343.e4. [PMID: 32763141 DOI: 10.1016/j.str.2020.07.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 06/08/2020] [Accepted: 07/21/2020] [Indexed: 01/28/2023]
Abstract
Single-molecule detection and manipulation is a powerful tool for unraveling dynamic biological processes. Unfortunately, success in such experiments is often challenged by tethering the biomolecule(s) of interest to a biocompatible surface. Here, we describe a robust surface passivation method by dense polymer brush grafting, based on optimized polyethylene glycol (PEG) deposition conditions, exactly at the lower critical point of an aqueous biphasic PEG-salt system. The increased biocompatibility achieved, compared with PEG deposition in sub-optimal conditions away from the critical point, allowed us to successfully detect the assembly and function of a large macromolecular machine, a fluorescent-labeled multi-subunit, human RNA Polymerase II Transcription Pre-Initiation Complex, on single, promoter-containing, surface-immobilized DNA molecules. This platform will enable probing the complex biochemistry and dynamics of large, multi-subunit macromolecular assemblies, such as during the initiation of human RNA Pol II transcription, at the single-molecule level.
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Affiliation(s)
- Sang Ryul Park
- California Institute for Quantitative Biosciences (QB3), University of California at Berkeley, Berkeley, CA 94720, USA; Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Jesse Hauver
- Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Tri-Institutional Training Program in Chemical Biology, New York, NY 10065, USA
| | - Yunxiang Zhang
- Departments of Physics and Molecular and Cellular Physiology, Stanford University, Stanford CA 94305, USA
| | - Andrey Revyakin
- California Institute for Quantitative Biosciences (QB3), University of California at Berkeley, Berkeley, CA 94720, USA; Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Robert A Coleman
- Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Robert Tjian
- Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Steven Chu
- Departments of Physics and Molecular and Cellular Physiology, Stanford University, Stanford CA 94305, USA.
| | - Alexandros Pertsinidis
- Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
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12
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Breyer RM, Clapp L, Coleman RA, Giembycz M, Heinemann A, Hills R, Jones RL, Narumiya S, Norel X, Pettipher R, Sugimoto Y, Uddin M, Woodward DF, Yao C. Prostanoid receptors (version 2019.5) in the IUPHAR/BPS Guide to Pharmacology Database. ACTA ACUST UNITED AC 2019. [DOI: 10.2218/gtopdb/f58/2019.5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Prostanoid receptors (nomenclature as agreed by the NC-IUPHAR Subcommittee on Prostanoid Receptors [659]) are activated by the endogenous ligands prostaglandins PGD2, PGE1, PGE2 , PGF2α, PGH2, prostacyclin [PGI2] and thromboxane A2. Measurement of the potency of PGI2 and thromboxane A2 is hampered by their instability in physiological salt solution; they are often replaced by cicaprost and U46619, respectively, in receptor characterization studies.
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13
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Carvajal LA, Neriah DB, Senecal A, Benard L, Thiruthuvanathan V, Yatsenko T, Narayanagari SR, Wheat JC, Todorova TI, Mitchell K, Kenworthy C, Guerlavais V, Annis DA, Bartholdy B, Will B, Anampa JD, Mantzaris I, Aivado M, Singer RH, Coleman RA, Verma A, Steidl U. Dual inhibition of MDMX and MDM2 as a therapeutic strategy in leukemia. Sci Transl Med 2019; 10:10/436/eaao3003. [PMID: 29643228 DOI: 10.1126/scitranslmed.aao3003] [Citation(s) in RCA: 164] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 02/12/2018] [Accepted: 03/23/2018] [Indexed: 12/14/2022]
Abstract
The tumor suppressor p53 is often inactivated via its interaction with endogenous inhibitors mouse double minute 4 homolog (MDM4 or MDMX) or mouse double minute 2 homolog (MDM2), which are frequently overexpressed in patients with acute myeloid leukemia (AML) and other cancers. Pharmacological disruption of both of these interactions has long been sought after as an attractive strategy to fully restore p53-dependent tumor suppressor activity in cancers with wild-type p53. Selective targeting of this pathway has thus far been limited to MDM2-only small-molecule inhibitors, which lack affinity for MDMX. We demonstrate that dual MDMX/MDM2 inhibition with a stapled α-helical peptide (ALRN-6924), which has recently entered phase I clinical testing, produces marked antileukemic effects. ALRN-6924 robustly activates p53-dependent transcription at the single-cell and single-molecule levels and exhibits biochemical and molecular biological on-target activity in leukemia cells in vitro and in vivo. Dual MDMX/MDM2 inhibition by ALRN-6924 inhibits cellular proliferation by inducing cell cycle arrest and apoptosis in cell lines and primary AML patient cells, including leukemic stem cell-enriched populations, and disrupts functional clonogenic and serial replating capacity. Furthermore, ALRN-6924 markedly improves survival in AML xenograft models. Our study provides mechanistic insight to support further testing of ALRN-6924 as a therapeutic approach in AML and other cancers with wild-type p53.
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Affiliation(s)
- Luis A Carvajal
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Daniela Ben Neriah
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Adrien Senecal
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Lumie Benard
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | | | - Tatyana Yatsenko
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Swathi-Rao Narayanagari
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Ruth L. and David S. Gottesman Institute for Stem Cell Research and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Justin C Wheat
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Tihomira I Todorova
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Kelly Mitchell
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Charles Kenworthy
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | | | | | - Boris Bartholdy
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Britta Will
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Ruth L. and David S. Gottesman Institute for Stem Cell Research and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Division of Hemato-Oncology, Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Jesus D Anampa
- Division of Hemato-Oncology, Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Ioannis Mantzaris
- Division of Hemato-Oncology, Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | | | - Robert H Singer
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Robert A Coleman
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Amit Verma
- Ruth L. and David S. Gottesman Institute for Stem Cell Research and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Division of Hemato-Oncology, Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Ulrich Steidl
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA. .,Ruth L. and David S. Gottesman Institute for Stem Cell Research and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Division of Hemato-Oncology, Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY 10461, USA.,Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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14
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Woodward DF, Wang JW, Coleman RA, Woodrooffe AJ, Clark KL, Stamer WD, Tao G, Fan S, Toris CB. A Highly Effective and Ultra-Long-Acting Anti-Glaucoma Drug, with a Novel Periorbital Delivery Method. J Ocul Pharmacol Ther 2019; 35:265-277. [DOI: 10.1089/jop.2018.0126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- David F. Woodward
- Department of Bioengineering, Imperial College London, South Kensington, London, England
- JeniVision, Inc., Irvine, California
| | | | | | | | | | - W. Daniel Stamer
- Department of Ophthalmology and Biomedical Engineering, Duke University, Durham, North Carolina
| | - Guoxian Tao
- Wincon Theracells Biotechnologies Co. Ltd., Nanning, China
| | - Shan Fan
- Department of Ophthalmology and Visual Sciences, University of Nebraska Medical Center, Omaha, Nebraska
| | - Carol B. Toris
- Department of Ophthalmology and Visual Sciences, University of Nebraska Medical Center, Omaha, Nebraska
- Department of Ophthalmology and Visual Science, School of Medicine, Case Western Reserve University, Cleveland, Ohio
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15
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Coleman RA, Woodrooffe AJ, Clark KL, Toris CB, Fan S, Wang JW, Woodward DF. The affinity, intrinsic activity and selectivity of a structurally novel EP 2 receptor agonist at human prostanoid receptors. Br J Pharmacol 2019; 176:687-698. [PMID: 30341781 PMCID: PMC6365485 DOI: 10.1111/bph.14525] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 09/14/2018] [Accepted: 09/26/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND PURPOSE Prostanoid EP2 receptor agonists exhibit several activities including ocular hypotension, tocolysis and anti-inflammatory activity. This report describes the affinity and selectivity of a structurally novel, non-prostanoid EP2 receptor agonist, PGN-9856, and its therapeutic potential. EXPERIMENTAL APPROACH The pharmacology of a series of non-prostanoid EP2 receptor agonists was determined according to functional and radioligand binding studies, mostly using human recombinant prostanoid receptor transfectants. The selectivity of PGN-9856, as the preferred compound, was subsequently determined by using a diverse variety of non-prostanoid target proteins. The therapeutic potential of PGN-9856 was addressed by determining its activity in relevant primate cell, tissue and disease models. KEY RESULTS PGN-9856 was a selective and high affinity (pKi ≥ 8.3) ligand at human recombinant EP2 receptors. In addition to high affinity binding, it was a potent and full EP2 receptor agonist with a high level of selectivity at EP1 , EP3 , EP4 , DP, FP, IP and TP receptors. In cells overexpressing human recombinant EP2 receptors, PGN-9856 displayed a potency (pEC50 ≥ 8.5) and a maximal response (increase in cAMP) comparable to that of the endogenous agonist PGE2 . PGN-9856 exhibited no appreciable affinity (up 10 μM) for a range of 53 other receptors, ion channels and enzymes. Finally, PGN-9856 exhibited tocolytic, anti-inflammatory and long-acting ocular hypotensive properties consistent with its potent EP2 receptor agonist properties. CONCLUSIONS AND IMPLICATIONS PGN-9856 is a potent, selective and efficacious prostanoid EP2 receptor agonist with diverse potential therapeutic applications: tocolytic, anti-inflammatory and notably anti-glaucoma.
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Affiliation(s)
| | | | | | - C B Toris
- University of Nebraska Medical Center, Omaha, NE, USA
| | - S Fan
- University of Nebraska Medical Center, Omaha, NE, USA
| | - J W Wang
- JeniVision Inc., Irvine, CA, USA
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16
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Coleman RA, Liang C, Patel R, Ali S, Mukherjee J. Brain and Brown Adipose Tissue Metabolism in Transgenic Tg2576 Mice Models of Alzheimer Disease Assessed Using 18F-FDG PET Imaging. Mol Imaging 2018; 16:1536012117704557. [PMID: 28654383 PMCID: PMC5470140 DOI: 10.1177/1536012117704557] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVE Imaging animal models of Alzheimer disease (AD) is useful for the development of therapeutic drugs and understanding AD. Transgenic Swedish hAPPswe Tg2576 mice are a good model of β-amyloid plaques. We report 18F-fluoro-2-deoxyglucose (18F-FDG) positron emission tomography (PET) imaging of brain and intrascapular brown adipose tissue (IBAT) in transgenic mice 2576 (Tg2576) and wild-type (WT) mice. METHODS Transgenic Tg2576 mice and WT mice, >18 months were injected intraperitonally with ≈ 25 to 30 MBq 18F-FDG while awake. After 60 minutes, they were anesthetized with isoflurane (2.5%) and imaged with Inveon MicroPET. Select mice were killed, imaged ex vivo, and 20 µm sections cut for autoradiography. 18F-FDG uptake in brain and IBAT PET and brain autoradiographs were analyzed. RESULTS Fasting blood glucose levels averaged 120 mg/dL for WT and 100 mg/dL for Tg2576. Compared to WT, Tg2576 mice exhibited a decrease in SUVglc in the various brain regions. Average reductions in the cerebrum regions were as high as -20%, while changes in cerebellum were -3%. Uptake of 18F-FDG in IBAT decreased by -60% in Tg2576 mice and was found to be significant. Intrascapular brown adipose tissue findings in Tg2576 mice are new and not previously reported. Use of blood glucose for PET data analysis and corpus callosum as reference region for autoradiographic analysis were important to detect change in Tg2576 mice. CONCLUSION Our results suggest that 18F-FDG uptake in the Tg2576 mice brain show 18F-FDG deficits only when blood glucose is taken into consideration.
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Affiliation(s)
- Robert A Coleman
- 1 Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
| | - Christopher Liang
- 1 Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
| | - Rima Patel
- 1 Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
| | - Sarah Ali
- 1 Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
| | - Jogeshwar Mukherjee
- 1 Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA, USA
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Kenworthy CA, Wong V, Dziuba P, Lavis LD, Liu WL, Singer RH, Coleman RA. Single Molecule Imaging of Chromatin Remodeling in Live Cells. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.2929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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18
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Abstract
To prevent tumorigenesis, p53 stimulates transcription by facilitating the recruitment of the transcription machinery on target gene promoters. Cryo-Electron Microscopy studies on p53-bound RNA Polymerase II (Pol II) reveal that p53 structurally regulates Pol II to affect its DNA binding and elongation, providing new insights into p53-mediated transcriptional regulation.
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Affiliation(s)
- Wei-Li Liu
- a Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology , Albert Einstein College of Medicine , Bronx , NY , USA
| | - Robert A Coleman
- a Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology , Albert Einstein College of Medicine , Bronx , NY , USA
| | - Sameer K Singh
- a Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology , Albert Einstein College of Medicine , Bronx , NY , USA
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Tavian D, Missaglia S, Castagnetta M, Degiorgio D, Pennisi EM, Coleman RA, Dell'Era P, Mora C, Angelini C, Coviello DA. Generation of induced Pluripotent Stem Cells as disease modelling of NLSDM. Mol Genet Metab 2017; 121:28-34. [PMID: 28391974 PMCID: PMC5434246 DOI: 10.1016/j.ymgme.2017.03.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/31/2017] [Accepted: 03/31/2017] [Indexed: 01/10/2023]
Abstract
Neutral Lipid Storage Disease with Myopathy (NLSDM) is a rare defect of triacylglycerol metabolism, characterized by the abnormal storage of neutral lipid in organelles known as lipid droplets (LDs). The main clinical features are progressive myopathy and cardiomyopathy. The onset of NLSDM is caused by autosomal recessive mutations in the PNPLA2 gene, which encodes adipose triglyceride lipase (ATGL). Despite its name, this enzyme is present in a wide variety of cell types and catalyzes the first step in triacylglycerol lipolysis and the release of fatty acids. Here, we report the derivation of NLSDM-induced pluripotent stem cells (NLSDM-iPSCs) from fibroblasts of two patients carrying different PNPLA2 mutations. The first patient was homozygous for the c.541delAC, while the second was homozygous for the c.662G>C mutation in the PNPLA2 gene. We verified that the two types of NLSDM-iPSCs possessed properties of embryonic-like stem cells and could differentiate into the three germ layers in vitro. Immunofluorescence analysis revealed that iPSCs had an abnormal accumulation of triglycerides in LDs, the hallmark of NLSDM. Furthermore, NLSDM-iPSCs were deficient in long chain fatty acid lipolysis, when subjected to a pulse chase experiment with oleic acid. Collectively, these results demonstrate that NLSDM-iPSCs are a promising in vitro model to investigate disease mechanisms and screen drug compounds for NLSDM, a rare disease with few therapeutic options.
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Affiliation(s)
- D Tavian
- Laboratory of Cellular Biochemistry and Molecular Biology, CRIBENS, Catholic University of the Sacred Heart, pz Buonarroti 30, Milan 20145, Italy; Psychology Department, Catholic University of the Sacred Heart, Largo Gemelli 1, Milan 20123, Italy.
| | - S Missaglia
- Laboratory of Cellular Biochemistry and Molecular Biology, CRIBENS, Catholic University of the Sacred Heart, pz Buonarroti 30, Milan 20145, Italy; Psychology Department, Catholic University of the Sacred Heart, Largo Gemelli 1, Milan 20123, Italy
| | - M Castagnetta
- Laboratory of Human Genetics, E.O. Ospedali Galliera, Via Volta 6, Genoa 16128, Italy
| | - D Degiorgio
- Laboratory of Human Genetics, E.O. Ospedali Galliera, Via Volta 6, Genoa 16128, Italy; Stem Cell Laboratory, Department of Experimental Medicine, University of Genoa, c/o Advanced Biotechnology Center, L.go R. Benzi, 10, Genoa 16132, Italy
| | - E M Pennisi
- UOC Neurologia, San Filippo Neri Hospital, via Martinotti 20, Rome 00135, Italy
| | - R A Coleman
- Department of Nutrition, University of North Carolina, Chapel Hill, NC 27599, USA
| | - P Dell'Era
- Cellular Fate Reprogramming Unit, Department of Molecular and Translational Medicine, University of Brescia, Brescia 25123, Italy
| | - C Mora
- Cellular Fate Reprogramming Unit, Department of Molecular and Translational Medicine, University of Brescia, Brescia 25123, Italy
| | - C Angelini
- IRCCS Fondazione Ospedale S. Camillo, Venice, Italy
| | - D A Coviello
- Laboratory of Human Genetics, E.O. Ospedali Galliera, Via Volta 6, Genoa 16128, Italy
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20
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Singh SK, Qiao Z, Song L, Jani V, Rice W, Eng E, Coleman RA, Liu WL. Structural visualization of the p53/RNA polymerase II assembly. Genes Dev 2016; 30:2527-2537. [PMID: 27920087 PMCID: PMC5159667 DOI: 10.1101/gad.285692.116] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 10/18/2016] [Indexed: 01/03/2023]
Abstract
Singh et al. dissected the human p53/Pol II interaction via single-particle cryo-electron microscopy, structural docking, and biochemical analyses. These findings indicate that p53 may structurally regulate DNA-binding functions of Pol II via the clamp domain, thereby providing insights into p53-regulated Pol II transcription. The master tumor suppressor p53 activates transcription in response to various cellular stresses in part by facilitating recruitment of the transcription machinery to DNA. Recent studies have documented a direct yet poorly characterized interaction between p53 and RNA polymerase II (Pol II). Therefore, we dissected the human p53/Pol II interaction via single-particle cryo-electron microscopy, structural docking, and biochemical analyses. This study reveals that p53 binds Pol II via the Rpb1 and Rpb2 subunits, bridging the DNA-binding cleft of Pol II proximal to the upstream DNA entry site. In addition, the key DNA-binding surface of p53, frequently disrupted in various cancers, remains exposed within the assembly. Furthermore, the p53/Pol II cocomplex displays a closed conformation as defined by the position of the Pol II clamp domain. Notably, the interaction of p53 and Pol II leads to increased Pol II elongation activity. These findings indicate that p53 may structurally regulate DNA-binding functions of Pol II via the clamp domain, thereby providing insights into p53-regulated Pol II transcription.
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Affiliation(s)
- Sameer K Singh
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Zhen Qiao
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Lihua Song
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Vijay Jani
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - William Rice
- New York Structural Biology Center, Manhattan, New York 10027, USA
| | - Edward Eng
- New York Structural Biology Center, Manhattan, New York 10027, USA
| | - Robert A Coleman
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Wei-Li Liu
- Gruss-Lipper Biophotonics Center, Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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Strindberg S, Coleman RA, Burns Perez VR, Campbell CL, Majil I, Gibson J. In-water assessments of sea turtles at Glover’s Reef Atoll, Belize. ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00765] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Garcia-Villar R, Green LR, Jenkins SL, Wentworth RA, Coleman RA, Nathanielsz PW. Evidence for the Presence of AH 13205-Sensitive EP2-Prostanoid Receptors in the Pregnant Baboon But Not in the Pregnant Sheep Myometrium Near Term. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/107155769500200102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | | | | | | | | | - Peter W. Nathanielsz
- Laboratory for Pregnancy and Newborn Research, Department of Physiology, College of Veterinary Medicine, Cornell University, Ithaca, New York; Department of Cardiovascular and Respiratory Pharmacology, Glaxy Research and Development Ltd., Ware, Herts, United Kingdom
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Abstract
Fibro-osseous pseudotumour is a rare, benign lesion which behaves aggressively and is, therefore, commonly misdiagnosed as a malignancy. Fibro-osseous pseudotumour shares many features with myositis ossificans and many consider it to be a subcutaneous variant of the latter. Early diagnosis and treatment by excision to normal tissue margins is important to preserve function and avoid digital amputation. We report a case of fibro-osseous pseudotumour of the finger which required ray amputation due to rapid progression of the lesion.
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Affiliation(s)
- R A Coleman
- Department of Plastic Surgery, Royal Brisbane Hospital, Herston, Queensland, Australia.
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24
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Wong V, Liu Z, Peng S, Kenworthy C, Liu WL, Coleman RA. Single Molecule Imaging of p53's Dynamic Interaction with Chromatin. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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25
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Coleman RA, Singh SK, Peng CS, Cianfrocco M, Zhang Z, Rice W, Eng E, Liu WL. Nanoscale Probing of the p53 Tumor Suppression Transcription Machinery. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.1278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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26
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Coleman RA, Liu Z, Darzacq X, Tjian R, Singer RH, Lionnet T. Imaging Transcription: Past, Present, and Future. Cold Spring Harb Symp Quant Biol 2016; 80:1-8. [PMID: 26763984 DOI: 10.1101/sqb.2015.80.027201] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Transcription, the first step of gene expression, is exquisitely regulated in higher eukaryotes to ensure correct development and homeostasis. Traditional biochemical, genetic, and genomic approaches have proved successful at identifying factors, regulatory sequences, and potential pathways that modulate transcription. However, they typically only provide snapshots or population averages of the highly dynamic, stochastic biochemical processes involved in transcriptional regulation. Single-molecule live-cell imaging has, therefore, emerged as a complementary approach capable of circumventing these limitations. By observing sequences of molecular events in real time as they occur in their native context, imaging has the power to derive cause-and-effect relationships and quantitative kinetics to build predictive models of transcription. Ongoing progress in fluorescence imaging technology has brought new microscopes and labeling technologies that now make it possible to visualize and quantify the transcription process with single-molecule resolution in living cells and animals. Here we provide an overview of the evolution and current state of transcription imaging technologies. We discuss some of the important concepts they uncovered and present possible future developments that might solve long-standing questions in transcriptional regulation.
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Affiliation(s)
- Robert A Coleman
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461
| | - Zhe Liu
- HHMI Janelia Research Campus, Ashburn, Virginia 20147
| | - Xavier Darzacq
- HHMI Janelia Research Campus, Ashburn, Virginia 20147 Department of MCB, LKS Biomedical and Health Sciences Center, CIRM Center of Excellence, University of California, Berkeley, California 94720
| | - Robert Tjian
- HHMI Janelia Research Campus, Ashburn, Virginia 20147 Department of MCB, LKS Biomedical and Health Sciences Center, CIRM Center of Excellence, University of California, Berkeley, California 94720
| | - Robert H Singer
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461 HHMI Janelia Research Campus, Ashburn, Virginia 20147
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Abstract
The Three Rs was a concept originally conceived as a means of reducing the suffering of laboratory animals that are used largely in identifying any potential safety issues with chemicals to which humans may be exposed. However, with growing evidence of the shortcomings of laboratory animal testing to reliably predict human responsiveness to such chemicals, questions are now being asked as to whether it is appropriate to use animals as human surrogates at all. This raises the question of whether, of the original Three Rs, two--Reduction and Refinement--are potentially redundant, and whether, instead, we should concentrate on the third R: Replacement. And if this is the best way forward, it is inevitable that this R should be based firmly on human biology. The present review outlines the current state-of-the-art regarding our access to human biology through in vitro, in silico and in vivo technologies, identifying strengths, weaknesses and opportunities, and goes on to address the prospect of achieving a single R, with some suggestions as to how to progress toward this goal.
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Donati-Bourne J, Roberts HW, Rajjoub Y, Coleman RA. A Review of Transplantation Practice of the Urologic Organs: Is It Only Achievable for the Kidney? Rev Urol 2015; 17:69-77. [PMID: 27222642 DOI: 10.3909/riu0659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Transplantation is a viable treatment option for failure of most major organs. Within urology, transplantation of the kidney and ureter are well documented; however, evidence supporting transplantation of other urologic organs is limited. Failure of these organs carries significant morbidity, and transplantation may have a role in management. This article reviews the knowledge, research, and literature surrounding transplantation of each of the urologic organs. Transplantation of the penis, testicle, urethra, vas deferens, and bladder is discussed. Transplantation attempts have been made individually with each of these organs. Penile transplantation has only been performed once in a human. Testicular transplantation research was intertwined with unethical lucrative pursuits. Interest in urethra, bladder, and vas deferens transplantation has decreased as a result of successful surgical reconstructive techniques. Despite years of effort, transplantations of the penis, testicle, urethra, vas deferens, and bladder are not established in current practice. Recent research has shifted toward techniques of reconstruction, tissue engineering, and regenerative medicine.
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Affiliation(s)
- Jack Donati-Bourne
- Urology Department, Royal Stoke University Hospital, Stoke-on-Trent, United Kingdom
| | - Harry W Roberts
- Ophthalmology Department, Ipswich Hospital, Ipswich, United Kingdom
| | - Yaseen Rajjoub
- General Surgery Department, Heartlands Hospital, Birmingham, United Kingdom
| | - Robert A Coleman
- Urology Department, Birmingham Children's Hospital, Birmingham, United Kingdom
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Kaur J, Khararjian A, Coleman RA, Constantinescu CC, Pan ML, Mukherjee J. Spinal cord dopamine D2/D3 receptors: in vivo and ex vivo imaging in the rat using (18)F/(11)C-fallypride. Nucl Med Biol 2014; 41:841-7. [PMID: 25199843 DOI: 10.1016/j.nucmedbio.2014.08.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/31/2014] [Accepted: 08/03/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVES The spinal cord is known to be innervated with dopaminergic cells with catecholaminergic projections arising from the medulla and pons and dopaminergic transmission in the spinal cord is vital for sensory and motor function. Our goal was to evaluate and compare the imaging capability of dopamine D2/D3 receptors in the rat spinal cord using PET ligands (18)F-fallypride and (11)C-fallypride. METHODS Male Sprague-Dawley rats were used in all in vitro and in vivo studies. Spinal cord and brain sections were used for in vitro autoradiography and ex vivo autoradiography. For in vivo studies animals received a (18)F-fallypride scan or a (11)C-fallypride PET scan. The spinal cord and the brain were then harvested, flash-frozen and imaged ex vivo. For in vivo analysis Logan plots with cerebellum as a reference was used to evaluate binding potentials (BP). Tissue ratios were used for ex vivo analysis. Drug effects were evaluated using clozapine, haloperidol and dopamine were evaluated on spinal cord sections in vitro. RESULTS In vitro studies showed (18)F-fallypride binding to superficial dorsal horn (SDH), dorsal horn (DH), ventral horn (VH) and the pars centralis (PC). In the cervical section, the greatest amount of binding appeared to be in the SDH. Ex vivo studies showed approximately 6% of (18)F-fallypride in SDH compared to that observed in the striatum. In vivo analysis of both (18)F-fallypride and (11)C-fallypride in the spinal cord were comparable to that in the extrastriatal regions. Haloperidol and clozapine displaced more than 75% of the (18)F-fallypride in spinal cord sections. CONCLUSIONS Our studies showed (18)F-fallypride and (11)C-fallypride binding in the spinal cord in vitro and in vivo. The binding pattern correlates well with the known distribution of dopamine D2/D3 receptors in the spinal cord.
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Affiliation(s)
- Jasmeet Kaur
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697
| | - Armen Khararjian
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697
| | - Robert A Coleman
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697
| | - Cristian C Constantinescu
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697
| | - Min-Liang Pan
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697
| | - Jogeshwar Mukherjee
- Preclinical Imaging, Department of Radiological Sciences, University of California-Irvine, Irvine, CA 92697.
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Wong V, Chen YJ, Kenworthy C, Song L, Dailey G, Liu WL, Coleman RA. Single Molecule Probing of P53's Ability to Dynamically Regulate Chromatin Structure. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.4463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Saigal N, Bajwa AK, Faheem SS, Coleman RA, Pandey SK, Constantinescu CC, Fong V, Mukherjee J. Evaluation of serotonin 5-HT(1A) receptors in rodent models using [¹⁸F]mefway PET. Synapse 2013; 67:596-608. [PMID: 23504990 DOI: 10.1002/syn.21665] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 03/09/2013] [Indexed: 11/10/2022]
Abstract
INTRODUCTION Serotonin 5-HT(1A) receptors have been investigated in various CNS disorders, including epilepsy, mood disorders, and neurodegeneration. [¹⁸F]Mefway (N-{2-[4-(2'-methoxyphenyl)piperazinyl]ethyl}-N-(2-pyridyl)-N-(cis/trans-4'-[¹⁸F]fluoromethylcyclohexane)-carboxamide) has been developed as a suitable positron emission tomography (PET) imaging agent for these receptors. We have now evaluated the suitability of [¹⁸F]trans-mefway in rat and mouse models using PET and computerized tomography (CT) imaging and corroborated with ex vivo and in vitro autoradiographic studies. METHODS Normal Sprague-Dawley rats and Balb/C mice were used for PET/CT imaging using intravenously injected [¹⁸F]trans-mefway. Brain PET data were coregistered with rat and mouse magnetic resonance imaging template and regional distribution of radioactivity was quantitated. Selected animals were used for ex vivo autoradiographic studies to confirm regional brain distribution and quantitative measures of binding, using brain region to cerebellum ratios. Binding affinity of trans-mefway and WAY-100635 was measured in rat brain homogenates. Distribution of [¹⁸F]trans-4-fluoromethylcyclohexane carboxylate ([¹⁸F]FMCHA), a major metabolite of [¹⁸F] trans-mefway, was assessed in the rat by PET/CT. RESULTS The inhibition constant, K(i) for trans-mefway was 0.84 nM and that for WAY-100635 was 1.07 nM. Rapid brain uptake of [¹⁸F]trans-mefway was observed in all rat brain regions and clearance from cerebellum was fast and was used as a reference region in all studies. Distribution of [¹⁸F]trans-mefway in various brain regions was consistent in PET and in vitro studies. The dorsal raphe was visualized and quantified in the rat PET but identification in the mouse was difficult. The rank order of binding to the various brain regions was hippocampus > frontal cortex > anterior cingulate cortex > lateral septal nuclei > dorsal raphe nuclei. CONCLUSION [¹⁸F]trans-Mefway appears to be an effective 5-HT(1A) receptor imaging agent in rodents for studies of various disease models.
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Affiliation(s)
- Neil Saigal
- Preclinical Imaging, Department of Radiological Sciences, University of California, Irvine, California, USA
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Coleman RA, Weeks AR, Hoffmann AA. Balancing genetic uniqueness and genetic variation in determining conservation and translocation strategies: a comprehensive case study of threatened dwarf galaxias, Galaxiella pusilla (Mack) (Pisces: Galaxiidae). Mol Ecol 2013; 22:1820-35. [PMID: 23432132 DOI: 10.1111/mec.12227] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 12/13/2012] [Accepted: 12/18/2012] [Indexed: 11/28/2022]
Abstract
Genetic markers are widely used to define and manage populations of threatened species based on the notion that populations with unique lineages of mtDNA and well-differentiated nuclear marker frequencies should be treated separately. However, a danger of this approach is that genetic uniqueness might be emphasized at the cost of genetic diversity, which is essential for adaptation and is potentially boosted by mixing geographically separate populations. Here, we re-explore the issue of defining management units, focussing on a detailed study of Galaxiella pusilla, a small freshwater fish of national conservation significance in Australia. Using a combination of microsatellite and mitochondrial markers, 51 populations across the species range were surveyed for genetic structure and diversity. We found an inverse relationship between genetic differentiation and genetic diversity, highlighting a long-term risk of deliberate isolation of G. pusilla populations based on protection of unique lineages. Instead, we adopt a method for identifying genetic management units that takes into consideration both uniqueness and genetic variation. This produced a management framework to guide future translocation and re-introduction efforts for G. pusilla, which contrasted to the framework based on a more traditional approach that may overlook important genetic variation in populations.
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Affiliation(s)
- R A Coleman
- Victorian Centre for Aquatic Pollution Identification and Management, Bio21 Institute, Department of Zoology, University of Melbourne, Parkville, Victoria, Australia.
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Abstract
Microalgal biofilms are sensitive to environmental conditions. Impacts of contaminants on assemblages of marine biofilm are often investigated in laboratories or in mesocosms. Such experiments are rarely representative of the effects of contaminants on biofilms under natural conditions. Studies in field situations, with enough power to detect impacts, are necessary to develop a better understanding of the effects of contaminants on ecological processes. Metals are a common contaminant of marine systems and can cause disturbances to assemblages. Using a new technique to experimentally deliver contaminants to microalgal assemblages, hypotheses were tested regarding the effects of zinc on microalgal biofilms growing on settlement panels in subtidal and intertidal habitats. PAM fluorometry was used to assess the amount and physiological state of biofilms on panels. Control panels deployed for 1 month in each habitat had significantly greater amounts of biofilm than those exposed to zinc. After deployment for 3 months, the results varied with location. The observed effects on the biofilm did not, however, cause significant changes in the macro-invertebrate assemblages that developed on the panels.
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Affiliation(s)
- M Mayer-Pinto
- School of Biological Sciences, Marine Ecology Laboratories A11, University of Sydney, NSW, Australia.
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Coleman RA. Human tissue in the evaluation of safety and efficacy of new medicines: a viable alternative to animal models? ISRN Pharm 2011; 2011:806789. [PMID: 22389860 PMCID: PMC3263708 DOI: 10.5402/2011/806789] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 05/15/2011] [Indexed: 11/23/2022]
Abstract
The pharma Industry's ability to develop safe and effective new drugs to market is in serious decline.
Arguably, a major contributor to this is the Industry's extensive reliance on nonhuman biology-based test methods to determine potential
safety and efficacy, objective analysis of which reveals poor predictive value. An obvious alternative approach is to use human-based tests,
but only if they are available, practical, and effective. While in vivo (phase 0 microdosing with high sensitivity mass spectroscopy)
and in silico (using established human biological data), technologies are increasingly being used, in vitro human approaches
are more rarely employed. However, not only are increasingly sophisticated in vitro test methods now available or under development,
but the basic ethically approved infrastructure through which human cells and tissues may be acquired is established. Along with clinical microdosing
and in silico approaches, more effective access to and use of human cells and tissues in vitro provide exciting and potentially
more effective opportunities for the assessment of safety and efficacy of new medicines.
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Abstract
The pharmaceutical industry is failing in its primary function, with increasing expenditure and decreased output in terms of new medicines brought to market. It cannot carry on as it is, without sliding into a terminal decline. It must, therefore, take some positive steps toward addressing its problems. We do not have to look far to see one very obvious problem, namely, the industry's continuing reliance on nonhuman biology as the basis of its evaluation of potential safety and efficacy. The time has come to focus on the relevant, and to realise that more human-based testing is essential, if the industry is to survive as a source of innovation in drug therapy. This can incorporate earlier clinical testing, in the form of microdosing, and promotion of the development of more-powerful computational approaches based on human information. Fortunately, headway is being made in both approaches. However, a problem remains in the lack of functional evaluation of human tissues, where the lack of commitment, and the inadequacy of the tissue resource itself, are hampering any serious developments. An outline of a collaborative scheme is proposed, that will address this issue, central to which is improved access to research tissues from heart-beating organ donors.
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Constantinescu CC, Coleman RA, Pan ML, Mukherjee J. Striatal and extrastriatal microPET imaging of D2/D3 dopamine receptors in rat brain with [¹⁸F]fallypride and [¹⁸F]desmethoxyfallypride. Synapse 2011; 65:778-87. [PMID: 21218455 DOI: 10.1002/syn.20904] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Accepted: 12/23/2010] [Indexed: 11/07/2022]
Abstract
In this study, we compared two different D(2/3) receptor ligands, [¹⁸F]fallypride and [¹⁸F]desmethoxyfallypride ([¹⁸F]DMFP) with respect to the duration of the scan, visualization of extrastriatal receptors, and binding potentials (BP(ND) ) in the rat brain. In addition, we studied the feasibility of using these tracers following a period of awake tracer uptake, during which the animal may perform a behavioral task. Male Sprague-Dawley rats were imaged with [¹⁸F]fallypride and with [¹⁸F]DMFP in four different studies using microPET. All scans were performed under isoflurane anesthesia. The first (test) and second (retest) study were 150-min baseline scans. No retest scans were performed with [¹⁸F]DMFP. A third study was a 60-min awake uptake of radiotracer followed by a 90-min scan. A fourth study was a 150-min competition scan with haloperidol (0.2 mg/kg) administered via tail vein at 90-min post-[¹⁸F]fallypride injection and 60-min post-[¹⁸F]DMFP. For the test-retest studies, BP(ND) was measured using both Logan noninvasive (LNI) method and the interval ratios (ITR) method. Cerebellum was used as a reference region. For the third study, the binding was measured only with the ITR method, and the results were compared to the baseline results. Studies showed that the average transient equilibrium time in the dorsal striatum (DSTR) was at 90 min for [¹⁸F]fallypride and 30 min for [¹⁸F]DMFP. The average BP(ND) for [¹⁸F]fallypride was 14.4 in DSTR, 6.8 in ventral striatum (VSTR), 1.3 in substantia nigra/ventral tegmental area (SN/VTA), 1.4 in colliculi (COL), and 1.5 in central gray area. In the case of [¹⁸F]DMFP, the average BP(ND) values were 2.2 in DSTR, 2.7 in VSTR, and 0.8 in SN/VTA. The haloperidol blockade showed detectable decrease in binding of both tracers in striatal regions with a faster displacement of [¹⁸F]DMFP. No significant changes in BP(ND) of [¹⁸F]fallypride due to the initial awake state of the animal were found, whereas BP(ND) of [¹⁸F]DMFP was significantly higher in the awake state compared to baseline. We were able to demonstrate that dynamic PET using MicroPET Inveon allows quantification of both striatal and extrastriatal [¹⁸F]fallypride binding in rats in vivo. Quantification of the striatal regions could be achieved with [¹⁸F]DMFP.
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Affiliation(s)
- Cristian C Constantinescu
- Preclinical Imaging, Department of Psychiatry and Human Behavior, University of California Irvine, Irvine, California 92697, USA.
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Affiliation(s)
- Miguel G Matias
- Centre for Research on Ecological Impacts of Coastal Cities, Marine Ecology Laboratories A11, School of Biological Sciences, University of Sydney, NSW 2006, Australia.
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Abstract
An immunocytochemical assay, which localizes phytochrome in situ, indicates that this plant chromoprotein is associated with both nuclei and plastids, in addition to the cytoplasm. In an etiolated oat shoot, phytochrome is most abundant just behind the apex of the coleoptile, where it is associated with parenchyma cells; it is apparently absent at the extreme apx of the coleoptile. Further back from the tip, phytochrome is found in the epidermal cells of the coleoptile; it decreases in concentration toward the node, where it is again abundant. Phytochrome is also abundant in the extreme apical cells of young adventitious roots and in association with the procambium of the mesocotyl.
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Affiliation(s)
- L H Pratt
- Department of General Biology, Vanderbilt University, Nashville, Tennessee 37203
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Betsou F, Rimm DL, Watson PH, Womack C, Hubel A, Coleman RA, Horn L, Terry SF, Zeps N, Clark BJ, Miranda LB, Hewitt RE, Elliott GD. What Are the Biggest Challenges and Opportunities for Biorepositories in the Next Three to Five Years? Biopreserv Biobank 2010; 8:81-8. [DOI: 10.1089/bio.2010.8210] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
The mechanism of the long duration of action of salmeterol at beta(2)-adrenoceptors has long been a matter of debate, and is still unresolved. Szczuka and colleagues have both summarized the position to date and suggested a new mechanistic contender, receptor rebinding. Despite this, they still do not come to any clear conclusion. Much of the literature data that they have drawn upon appears contradictory, and mathematical models are inevitably flawed by the questionable validity of key values applied to them. Although the issue will undoubtedly eventually be resolved, it will probably require investigators to apply carefully designed studies on simple experimental systems such as isolated membranes or cultured cells. Only then should studies be extended to more complex systems such as isolated preparations of airways smooth muscle, where tissue bulk inevitably presents a complicating factor, particularly where relatively lipophilic compounds are concerned.
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Coleman RA, Winkle DC, Borzi PA. Urethral duplication: cases of ventral and dorsal complete duplication and review of the literature. J Pediatr Urol 2010; 6:188-91. [PMID: 19716341 DOI: 10.1016/j.jpurol.2009.07.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Accepted: 07/01/2009] [Indexed: 12/01/2022]
Abstract
Urethral duplication is a rare congenital anomaly, with multiple described anatomical variants. Duplications in the sagittal plane can be complete or partial, dorsal or ventral, and may be associated with other congenital urogenital anomalies. The anatomy of the duplication should be defined, and the functional urethra identified prior to any corrective surgical intervention. Correction aims to restore normal cosmesis, provide functional voiding and maintain continence. We describe two cases of urethral duplication in the sagittal plane, outline our approach to surgical correction, and review the literature.
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Affiliation(s)
- Robert A Coleman
- Mater Children's Hospital, Raymond Tce, South Brisbane, Qld 4101, Australia.
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Abstract
Today's drug discovery and development paradigm is not working, and something needs to be done about it. There is good reason to believe that a move away from reliance on animal surrogates for human subjects in the Pharma Industry's R&D programmes could provide an important step forward. However, no serious move will be made in that direction until there is some hard evidence that it will be rewarded with improved productivity outcomes. The Safer Medicines Trust are proposing that a study be undertaken, involving a range of drugs that have been approved for human use, but have subsequently proved to have limitations in terms of safety and/or efficacy. The aim is to determine the efficiency of a battery of human-based test methods to identify a compound's safety and efficacy profiles, and to compare this with that of the more traditional, largely animal-based methods that were employed in their original development. Should such an approach prove more reliable, the authorities will be faced with important decisions relating to the role of human biological test data in regulatory submissions, while the Pharma Industry will be faced with the key logistical issue of how to acquire the human biomaterials necessary to make possible the routine application of such test methods.
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Liu WL, Coleman RA, Ma E, Grob P, Yang JL, Zhang Y, Dailey G, Nogales E, Tjian R. Structures of three distinct activator-TFIID complexes. Genes Dev 2009; 23:1510-21. [PMID: 19571180 DOI: 10.1101/gad.1790709] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Sequence-specific DNA-binding activators, key regulators of gene expression, stimulate transcription in part by targeting the core promoter recognition TFIID complex and aiding in its recruitment to promoter DNA. Although it has been established that activators can interact with multiple components of TFIID, it is unknown whether common or distinct surfaces within TFIID are targeted by activators and what changes if any in the structure of TFIID may occur upon binding activators. As a first step toward structurally dissecting activator/TFIID interactions, we determined the three-dimensional structures of TFIID bound to three distinct activators (i.e., the tumor suppressor p53 protein, glutamine-rich Sp1 and the oncoprotein c-Jun) and compared their structures as determined by electron microscopy and single-particle reconstruction. By a combination of EM and biochemical mapping analysis, our results uncover distinct contact regions within TFIID bound by each activator. Unlike the coactivator CRSP/Mediator complex that undergoes drastic and global structural changes upon activator binding, instead, a rather confined set of local conserved structural changes were observed when each activator binds holo-TFIID. These results suggest that activator contact may induce unique structural features of TFIID, thus providing nanoscale information on activator-dependent TFIID assembly and transcription initiation.
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Affiliation(s)
- Wei-Li Liu
- Howard Hughes Medical Institute, Molecular and Cell Biology Department, University of California at Berkeley, Berkeley, California 94720, USA
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Maubach KA, Davis RJ, Clark DE, Fenton G, Lockey PM, Clark KL, Oxford AW, Hagan RM, Routledge C, Coleman RA. BGC20-1531, a novel, potent and selective prostanoid EP receptor antagonist: a putative new treatment for migraine headache. Br J Pharmacol 2009; 156:316-27. [PMID: 19154437 DOI: 10.1111/j.1476-5381.2009.00027.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
BACKGROUND AND PURPOSE Prostanoid EP(4) receptor antagonists may have therapeutic utility in the treatment of migraine since EP(4) receptors have been shown to be involved in prostaglandin (PG)E(2)-induced cerebral vascular dilatation, which may be an important contributor to migraine pain. This study reports the pharmacological characterization of BGC20-1531, a novel EP(4) receptor antagonist. EXPERIMENTAL APPROACH BGC20-1531 was characterized in radioligand binding and in vitro functional assays employing recombinant and native EP(4) receptors. Changes in canine carotid haemodynamics were used to assess the pharmacodynamic profile of BGC20-1531 in vivo. KEY RESULTS BGC20-1531 exhibited high affinity at recombinant human EP(4) receptors expressed in cell lines (pK(B) 7.6) and native EP(4) receptors in human cerebral and meningeal artery (pK(B) 7.6-7.8) but showed no appreciable affinity at a wide range of other receptors (including other prostanoid receptors), channels, transporters and enzymes (pKi < 5). BGC20-1531 competitively antagonized PGE(2)-induced vasodilatation of human middle cerebral (pK(B) 7.8) and meningeal (pK(B) 7.6) arteries in vitro, but had no effect on responses induced by PGE(2) on coronary, pulmonary or renal arteries in vitro. BGC20-1531 (1-10 mg.kg(-1) i.v.) caused a dose-dependent antagonism of the PGE(2)-induced increase in canine carotid blood flow in vivo. CONCLUSIONS AND IMPLICATIONS BGC20-1531 is a potent and selective antagonist at EP(4) receptors in vitro and in vivo, with the potential to alleviate the symptoms of migraine that result from cerebral vasodilatation. BGC20-1531 is currently in clinical development for the treatment of migraine headache.
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Affiliation(s)
- K A Maubach
- BTG International Ltd., 10 Fleet Place, Limeburner Lane, London, UK.
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Pellon-Maison M, Garcia CF, Cattaneo ER, Coleman RA, Gonzalez-Baro MR. Macrobrachium borellii hepatopancreas contains a mitochondrial glycerol-3-phosphate acyltransferase which initiates triacylglycerol biosynthesis. Lipids 2009; 44:337-44. [PMID: 19130111 DOI: 10.1007/s11745-008-3275-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2008] [Accepted: 11/26/2008] [Indexed: 11/26/2022]
Abstract
Mammals express four isoforms of glycerol-3-phosphate acyltransferase (GPAT). The mitochondrial isoform GPAT1 may have been the acyltransferase that appeared first in evolution. The hepatopancreas of the crustacean Macrobrachium borellii has a high capacity for triacylglycerol (TAG) biosynthesis and storage. In order to understand the mechanism of glycerolipid biosynthesis in M. borellii, we investigated its hepatopancreas GPAT activity. In hepatopancreas mitochondria, we identified a GPAT activity with characteristics similar to those of mammalian GPAT1. The activity was resistant to inactivation by SH-reactive N-ethylmaleimide, it was activated by polymyxin-B, and its preferred substrate was palmitoyl-CoA. The reaction products were similar to those of mammalian GPAT1. A 70-kDa protein band immunoreacted with an anti-rat liver GPAT1 antibody. Surprisingly, we did not detect high GPAT specific activity in hepatopancreas microsomes. GPAT activity in microsomes was consistent with mitochondrial contamination, and its properties were similar to those of the mitochondrial activity. In microsomes, TAG synthesis was not dependent on the presence of glycerol-3 phosphate as a substrate, and the addition of monoacylglycerol as a substrate increased TAG synthesis 2-fold. We conclude that in M. borellii the de novo triacylglycerol biosynthetic pathway can be completed in the mitochondria. In contrast, TAG synthesis in the ER may function via the monoacylglycerol pathway.
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Affiliation(s)
- M Pellon-Maison
- Instituto de Investigaciones Bioquímicas de La Plata, CCT La Plata, CONICET INIBIOLP, Facultad Ciencias Médicas UNLP, Calles 60 & 120, La Plata, Argentina
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Abstract
Determination of the bicarbonate retention factor (BRF) is an important step during development of the indicator amino acid oxidation technique for use in a new model. A series of 4-h oxidation experiments were performed to determine the BRF of broilers aged 7, 14, 21, 28, 35, and 42 d using 4 birds per age group. A priming dose of 1.2 microCi of NaH(14)CO(3), followed by eight half-hourly doses of 1 microCi of NaH(14)CO(3) were given orally to each of 4 birds per age. The percentage of (14)C dose expired by the bird at a steady state was measured. These birds, as well as 12 additional birds matched for age and BW, were killed, and femur bone mineral density was measured by quantitative computed tomography to determine the relationship between bone development and bicarbonate retention at each age. There was a correlation (r = 0.50; P < 0.05) between total cross-sectional femur bone mineral density and bicarbonate retention at each age. A prediction equation (Y = 6.95 x 10(-2)X - 3.51 x 10(-5)X(2) + 27.58; P < 0.0001, R(2) = 0.79) where Y = bicarbonate retention and X = BW was generated to predict Y as a function of X. Bicarbonate retention values peaked at 28 d, during the stage of the most rapid bone deposition and the highest growth rate. A constant BRF was found from 1,900 to 2,700 g of BW of 35.15 +/- 1.095% (mean +/- SEM). This retention factor will allow the accurate correction of oxidation of (14)C-labeled substrates in broilers of different ages and BW in future indicator amino acid oxidation studies.
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Affiliation(s)
- M A Leslie
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada T6G 2P5
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Abstract
Quantitative gene expression data are often normalized to the expression levels of control or so-called “housekeeping” genes. An inherent assumption in the use of housekeeping genes is that expression of the genes remains constant in the cells or tissues under investigation. Although exceptions to this assumption are well documented, housekeeping genes are of value in fully characterized systems. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is one of the most commonly used housekeeping genes used in comparisons of gene expression data. To investigate the value of GAPDH as a housekeeping gene in human tissues, the expression of GAPDH mRNA was measured in a panel of 72 different pathologically normal human tissue types. Measurements were obtained from 371,088 multiplexed, quantitative real-time RT-PCRs with specific target genes. Significant differences in the expression levels of GAPDH mRNA were observed between tissue types and between donors of the same tissue. A 15-fold difference in GAPDH mRNA copy numbers was observed between the highest and lowest expressing tissue types, skeletal muscle and breast, respectively. No specific effect of either age or gender was observed on GAPDH mRNA expression. These data provide an extensive analysis of GAPDH mRNA expression in human tissues and confirm previous reports of the marked variability of GAPDH expression between tissue types. These data establish comparative levels of expression and can be used to add value to gene expression data in which GAPDH is used as the internal control.
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Affiliation(s)
- Robert D Barber
- Pharmagene Laboratories Limited, Royston, Hertfordshire, United Kingdom.
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Davis RJ, Page KJ, Dos Santos Cruz GJ, Harmer DW, Munday PW, Williams SJ, Picot J, Evans TJ, Sheldrick RL, Coleman RA, Clark KL. Expression and Functions of the Duodenal Peptide Secretin and its Receptor in Human Lung. Am J Respir Cell Mol Biol 2004; 31:302-8. [PMID: 15191914 DOI: 10.1165/rcmb.2004-0035oc] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The physiological role of the duodenal peptide secretin is as a potent stimulant of electrolyte and water movement in pancreatic and biliary epithelium, via activation of G protein-coupled secretin receptors (hSCTR). However, the distribution and potential function of hSCTR in human lung has not previously been addressed. Using real-time quantitative reverse transcriptase-polymerase chain reaction profiling, in situ hybridization, and immunohistochemistry, we demonstrated that the hSCTR is abundantly expressed within the distal regions of human lung (tertiary bronchus and parenchyma), with negligible expression detected in more proximal regions (trachea, primary, and secondary bronchus). Expression was observed predominantly on the basolateral membrane of the bronchial epithelial layer, with some expression also observed in bronchial smooth muscle. In primary cultures of human tertiary bronchial epithelial cells, secretin was demonstrated to potently stimulate channel-mediated Cl- efflux in a concentration-dependent manner. Secretin was also shown to cause concentration-dependent relaxation of human tertiary bronchial smooth muscle. In summary, these data demonstrate that secretin receptors are present in human lung, and that activation of these receptors with human secretin potently stimulates concentration-dependent Cl- efflux from bronchial epithelial cells and bronchorelaxation.
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Affiliation(s)
- Richard J Davis
- Pharmagene Laboratories, Royston, Hertfordshire, United Kingdom.
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