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Brügger A, Bilheux HZ, Lin JYY, Nelson GJ, Kiss AM, Morris J, Connolly MJ, Long AM, Tremsin AS, Strzelec A, Anderson MH, Agasie R, Finney CEA, Wissink ML, Hubler MH, Pellenq RJM, White CE, Heuser BJ, Craft AE, Harp JM, Tan C, Morris K, Junghans A, Sevanto S, Warren JM, Esteban Florez FL, Biris AS, Cekanova M, Kardjilov N, Schillinger B, Frost MJ, Vogel SC. The Complex, Unique, and Powerful Imaging Instrument for Dynamics (CUPI2D) at the Spallation Neutron Source (invited). Rev Sci Instrum 2023; 94:2890223. [PMID: 37171234 DOI: 10.1063/5.0131778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 03/05/2023] [Indexed: 05/13/2023]
Abstract
The Oak Ridge National Laboratory is planning to build the Second Target Station (STS) at the Spallation Neutron Source (SNS). STS will host a suite of novel instruments that complement the First Target Station's beamline capabilities by offering an increased flux for cold neutrons and a broader wavelength bandwidth. A novel neutron imaging beamline, named the Complex, Unique, and Powerful Imaging Instrument for Dynamics (CUPI2D), is among the first eight instruments that will be commissioned at STS as part of the construction project. CUPI2D is designed for a broad range of neutron imaging scientific applications, such as energy storage and conversion (batteries and fuel cells), materials science and engineering (additive manufacturing, superalloys, and archaeometry), nuclear materials (novel cladding materials, nuclear fuel, and moderators), cementitious materials, biology/medical/dental applications (regenerative medicine and cancer), and life sciences (plant-soil interactions and nutrient dynamics). The innovation of this instrument lies in the utilization of a high flux of wavelength-separated cold neutrons to perform real time in situ neutron grating interferometry and Bragg edge imaging-with a wavelength resolution of δλ/λ ≈ 0.3%-simultaneously when required, across a broad range of length and time scales. This manuscript briefly describes the science enabled at CUPI2D based on its unique capabilities. The preliminary beamline performance, a design concept, and future development requirements are also presented.
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Affiliation(s)
- Adrian Brügger
- Civil Engineering & Engineering Mechanics, Columbia University, New York, New York 10027, USA
| | - Hassina Z Bilheux
- Oak Ridge National Laboratory, Spallation Neutron Source, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - Jiao Y Y Lin
- Oak Ridge National Laboratory, Second Target Station Project, Oak Ridge, Tennessee 37831, USA
| | - George J Nelson
- Mechanical and Aerospace Engineering, University of Alabama-Huntsville, Huntsville, Alabama 35899, USA
| | - Andrew M Kiss
- Brookhaven National Laboratory, National Synchrotron Light Source II, Photon Science Division, Upton, New York 11973, USA
| | | | - Matthew J Connolly
- Material Measurement Laboratory/Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - Alexander M Long
- Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545, USA
| | - Anton S Tremsin
- Space Science Laboratory, University of California-Berkeley, Berkeley, California 94720, USA
| | - Andrea Strzelec
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Mark H Anderson
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Robert Agasie
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Charles E A Finney
- Oak Ridge National Laboratory, Buildings and Transportation Science Division, Oak Ridge, Tennessee 37831, USA
| | - Martin L Wissink
- Oak Ridge National Laboratory, Buildings and Transportation Science Division, Oak Ridge, Tennessee 37831, USA
| | - Mija H Hubler
- College of Engineering and Applied Science, University of Colorado-Boulder, Boulder, Colorado 80309, USA
| | - Roland J-M Pellenq
- International Research Laboratory, CNRS-George Washington University, Washington, District of Columbia 20052, USA
| | - Claire E White
- Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Brent J Heuser
- The Grainger College of Engineering, University of Illinois-Urbana Champaign, Urbana, Illinois 61801, USA
| | - Aaron E Craft
- Idaho National Laboratory, Characterization and Advanced Post-Irradiation Examination Division, Idaho Falls, Idaho 83415, USA
| | - Jason M Harp
- Oak Ridge National Laboratory, Nuclear Energy and Fuel Cycle Division, Oak Ridge, Tennessee 37831, USA
| | - Chuting Tan
- Idaho National Laboratory, Characterization and Advanced Post-Irradiation Examination Division, Idaho Falls, Idaho 83415, USA
| | | | - Ann Junghans
- Los Alamos National Laboratory, Nuclear Engineering and Nonproliferation Division, Los Alamos, New Mexico 87545, USA
| | - Sanna Sevanto
- Los Alamos National Laboratory, Environmental Sciences Division, Los Alamos, New Mexico 87545, USA
| | - Jeffrey M Warren
- Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, Tennessee 37831, USA
| | - Fernando L Esteban Florez
- University of Oklahoma Health Sciences Center College of Dentistry, Oklahoma City, Oklahoma 73117, USA
| | - Alexandru S Biris
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, Little Rock, Arkansas 72204, USA
| | - Maria Cekanova
- Integrity Laboratories, LLC, Knoxville, Tennessee 37932, USA
| | - Nikolay Kardjilov
- Helmholtz-Zentrum-Berlin, Institute Applied Materials, Berlin 14109, Germany
| | | | - Matthew J Frost
- Oak Ridge National Laboratory, Neutron Technologies Division, Oak Ridge, Tennessee 37831, USA
| | - Sven C Vogel
- Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545, USA
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Simard JR, Michelsen K, Wang Y, Yang C, Youngblood B, Grubinska B, Taborn K, Gillie DJ, Cook K, Chung K, Long AM, Hall BE, Shaffer PL, Foti RS, Gingras J. Modulation of Ligand-Gated Glycine Receptors Via Functional Monoclonal Antibodies. J Pharmacol Exp Ther 2022; 383:56-69. [PMID: 35926871 DOI: 10.1124/jpet.121.001026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 07/15/2022] [Accepted: 07/19/2022] [Indexed: 12/15/2022] Open
Abstract
Ion channels are targets of considerable therapeutic interest to address a wide variety of neurologic indications, including pain perception. Current pharmacological strategies have focused mostly on small molecule approaches that can be limited by selectivity requirements within members of a channel family or superfamily. Therapeutic antibodies have been proposed, designed, and characterized to alleviate this selectivity limitation; however, there are no Food and Drug Administration-approved therapeutic antibody-based drugs targeting ion channels on the market to date. Here, in an effort to identify novel classes of engineered ion channel modulators for potential neurologic therapeutic applications, we report the generation and characterization of six (EC50 < 25nM) Cys-loop receptor family monoclonal antibodies with modulatory function against rat and human glycine receptor alpha 1 (GlyRα1) and/or GlyRα3. These antibodies have activating (i.e., positive modulator) or inhibiting (i.e., negative modulator) profiles. Moreover, GlyRα3 selectivity was successfully achieved for two of the three positive modulators identified. When dosed intravenously, the antibodies achieved sufficient brain exposure to cover their calculated in vitro EC50 values. When compared head-to-head at identical exposures, the GlyRα3-selective antibody showed a more desirable safety profile over the nonselective antibody, thus demonstrating, for the first time, an advantage for GlyRα3-selectivity. Our data show that ligand-gated ion channels of the glycine receptor family within the central nervous system can be functionally modulated by engineered biologics in a dose-dependent manner and that, despite high protein homology between the alpha subunits, selectivity can be achieved within this receptor family, resulting in future therapeutic candidates with more desirable drug safety profiles. SIGNIFICANCE STATEMENT: This study presents immunization and multiplatform screening approaches to generate a diverse library of functional antibodies (agonist, potentiator, or inhibitory) raised against human glycine receptors (GlyRs). This study also demonstrates the feasibility of acquiring alpha subunit selectivity, a desirable therapeutic profile. When tested in vivo, these tool molecules demonstrated an increased safety profile in favor of GlyRα3-selectivity. These are the first reported functional GlyR antibodies that may open new avenues to treating central nervous system diseases with subunit selective biologics.
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Affiliation(s)
- Jeffrey R Simard
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Klaus Michelsen
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Yan Wang
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Chunhua Yang
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Beth Youngblood
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Barbara Grubinska
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Kristin Taborn
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Daniel J Gillie
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Kevin Cook
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Kyu Chung
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Alexander M Long
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Brian E Hall
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Paul L Shaffer
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Robert S Foti
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
| | - Jacinthe Gingras
- Departments of Neuroscience (J.R.S., C.Y., B.Y. B.G., K.T., D.J.G., J.G.), Molecular Engineering (K.M., A.M.L., P.L.S.), Protein Technologies (Y.W., B.E.H.), and Pharmacokinetics and Drug Metabolism (R.S.F.), Amgen Research, Cambridge, Massachusetts; and Department of Pharmacokinetics and Drug Metabolism, Amgen Research, 1120 Veterans Boulevard, South San Francisco, California (K.Co., K.Ch.)
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Talley SJ, Robison T, Long AM, Lee SY, Brounstein Z, Lee KS, Geller D, Lum E, Labouriau A. Flexible 3D printed silicones for gamma and neutron radiation shielding. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109616] [Citation(s) in RCA: 4] [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: 11/27/2022]
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4
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Orchard GE, Shams M, Nwokie T, Fernando P, Bulut C, Quaye CJ, Gabriel J, Ramji Z, Georgaki A, Watt M, Cole Z, Stewart K, McTaggart V, Padayachy S, Long AM, Ogden A, Andrews C, Birchall A, Shams F, Neesam H, Haine N. A multicentre study of the precision and accuracy of the TruSlice and TruSlice Digital histological dissection devices. Br J Biomed Sci 2016; 73:163-167. [PMID: 27922431 DOI: 10.1080/09674845.2016.1233791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Five key factors enabling a good surgical grossing technique include a flat uniformly perpendicular specimen cutting face, appropriate immobilisation of the tissue specimen during grossing, good visualisation of the cutting tissue face, sharp cutting knives and the grossing knife action. TruSlice and TruSlice Digital are new innovative tools based on a guillotine configuration. The TruSlice has plastic inserts whilst the TruSlice Digital has an electronic micrometre attached: both features enable these dissection factors to be controlled. The devices were assessed in five hospitals in the UK. MATERIAL AND METHODS A total of 267 fixed tissue samples from 23 tissue types were analysed, principally the breast (n = 32) skin (30), rectum (28), colon (27) and cervix (17). Precision and accuracy were evaluated by measuring the defined thickness, and the consistency of achieving the defined thickness of tissue samples taken respectively. Both parameters were expressed as a total percentage of compliance for the cohort of samples accessed. RESULTS Overall, the mean (standard deviation) score for precision was 81 (11) % whilst the accuracy score was 82 (11) % (both p < 0.05, chi-squared test), although this varied with type of tissue. Accuracy and precision were strongly correlated (rp = 0.83, p < 0.001). CONCLUSION The TruSlice Digital devices offer an assured precision and accuracy performance which is reproducible across an assortment of tissue types. The use of a micrometre to set tissue slice thickness is innovative and should comply with laboratory accreditation requirements, alleviating concerns of how to tackle issues such as the 'measurement of uncertainty' at the grossing bench.
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Affiliation(s)
- G E Orchard
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - M Shams
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - T Nwokie
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - P Fernando
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - C Bulut
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - C J Quaye
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - J Gabriel
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - Z Ramji
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - A Georgaki
- a Viapath, St John's Institute of Dermatology , St. Thomas' Hospital , London , UK
| | - M Watt
- b Crosshouse Hospital , Kilmarnock , UK
| | - Z Cole
- b Crosshouse Hospital , Kilmarnock , UK
| | - K Stewart
- b Crosshouse Hospital , Kilmarnock , UK
| | | | - S Padayachy
- c Southampton General Hospital , Southampton , UK
| | - A M Long
- c Southampton General Hospital , Southampton , UK
| | - A Ogden
- c Southampton General Hospital , Southampton , UK
| | - C Andrews
- d Heartlands Hospital , Birmingham , UK
| | - A Birchall
- e Wythenshawe Hospital , Manchester , UK
| | - F Shams
- f Barts and the London School of Medicine, Queen Mary University of London , London , UK
| | | | - N Haine
- g CellPath Ltd. , Powys , UK
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Zhang C, Long AM, Swalm B, Charest K, Wang Y, Hu J, Schulz C, Goetzinger W, Hall BE. Development of an automated mid-scale parallel protein purification system for antibody purification and affinity chromatography. Protein Expr Purif 2016; 128:29-35. [DOI: 10.1016/j.pep.2016.08.005] [Citation(s) in RCA: 9] [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] [Received: 06/16/2016] [Revised: 08/01/2016] [Accepted: 08/03/2016] [Indexed: 11/26/2022]
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Smith AL, Andrews KL, Beckmann H, Bellon SF, Beltran PJ, Booker S, Chen H, Chung YA, D’Angelo ND, Dao J, Dellamaggiore KR, Jaeckel P, Kendall R, Labitzke K, Long AM, Materna-Reichelt S, Mitchell P, Norman MH, Powers D, Rose M, Shaffer PL, Wu MM, Lipford JR. Discovery of 1H-Pyrazol-3(2H)-ones as Potent and Selective Inhibitors of Protein Kinase R-like Endoplasmic Reticulum Kinase (PERK). J Med Chem 2015; 58:1426-41. [DOI: 10.1021/jm5017494] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Holger Beckmann
- Amgen Research GmbH, Josef-Engert-Straße
11, D-93053 Regensburg, Germany
| | | | | | | | | | | | | | | | | | - Peter Jaeckel
- Amgen Research GmbH, Josef-Engert-Straße
11, D-93053 Regensburg, Germany
| | | | - Katja Labitzke
- Amgen Research GmbH, Josef-Engert-Straße
11, D-93053 Regensburg, Germany
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Rew Y, Sun D, Yan X, Beck HP, Canon J, Chen A, Duquette J, Eksterowicz J, Fox BM, Fu J, Gonzalez AZ, Houze J, Huang X, Jiang M, Jin L, Li Y, Li Z, Ling Y, Lo MC, Long AM, McGee LR, McIntosh J, Oliner JD, Osgood T, Saiki AY, Shaffer P, Wang YC, Wortman S, Yakowec P, Ye Q, Yu D, Zhao X, Zhou J, Medina JC, Olson SH. Discovery of AM-7209, a potent and selective 4-amidobenzoic acid inhibitor of the MDM2-p53 interaction. J Med Chem 2014; 57:10499-511. [PMID: 25384157 DOI: 10.1021/jm501550p] [Citation(s) in RCA: 31] [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: 11/29/2022]
Abstract
Structure-based rational design and extensive structure-activity relationship studies led to the discovery of AMG 232 (1), a potent piperidinone inhibitor of the MDM2-p53 association, which is currently being evaluated in human clinical trials for the treatment of cancer. Further modifications of 1, including replacing the carboxylic acid with a 4-amidobenzoic acid, afforded AM-7209 (25), featuring improved potency (KD from ITC competition was 38 pM, SJSA-1 EdU IC50 = 1.6 nM), remarkable pharmacokinetic properties, and in vivo antitumor activity in both the SJSA-1 osteosarcoma xenograft model (ED50 = 2.6 mg/kg QD) and the HCT-116 colorectal carcinoma xenograft model (ED50 = 10 mg/kg QD). In addition, 25 possesses distinct mechanisms of elimination compared to 1.
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Affiliation(s)
- Yosup Rew
- Department of Therapeutic Discovery, ‡Department of Pharmaceutics, and §Department of Pharmacokinetics and Drug Metabolism, Amgen Inc. , 1120 Veterans Boulevard, South San Francisco, California 94080, United States
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Graves JD, Kordich JJ, Huang TH, Piasecki J, Bush TL, Sullivan T, Foltz IN, Chang W, Douangpanya H, Dang T, O'Neill JW, Mallari R, Zhao X, Branstetter DG, Rossi JM, Long AM, Huang X, Holland PM. Apo2L/TRAIL and the death receptor 5 agonist antibody AMG 655 cooperate to promote receptor clustering and antitumor activity. Cancer Cell 2014; 26:177-89. [PMID: 25043603 DOI: 10.1016/j.ccr.2014.04.028] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Revised: 02/28/2014] [Accepted: 04/30/2014] [Indexed: 12/15/2022]
Abstract
Death receptor agonist therapies have exhibited limited clinical benefit to date. Investigations into why Apo2L/TRAIL and AMG 655 preclinical data were not predictive of clinical response revealed that coadministration of Apo2L/TRAIL with AMG 655 leads to increased antitumor activity in vitro and in vivo. The combination of Apo2L/TRAIL and AMG 655 results in enhanced signaling and can sensitize Apo2L/TRAIL-resistant cells. Structure determination of the Apo2L/TRAIL-DR5-AMG 655 ternary complex illustrates how higher order clustering of DR5 is achieved when both agents are combined. Enhanced agonism generated by combining Apo2L/TRAIL and AMG 655 provides insight into the limited efficacy observed in previous clinical trials and suggests testable hypotheses to reconsider death receptor agonism as a therapeutic strategy.
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MESH Headings
- Animals
- Antibodies, Monoclonal/chemistry
- Antibodies, Monoclonal/pharmacology
- Antineoplastic Agents/chemistry
- Antineoplastic Agents/pharmacology
- Cell Line, Tumor
- Cell Survival
- Crystallography, X-Ray
- Drug Resistance, Neoplasm
- Drug Synergism
- Humans
- Mice
- Models, Molecular
- Protein Multimerization
- Protein Structure, Quaternary
- Receptors, TNF-Related Apoptosis-Inducing Ligand/antagonists & inhibitors
- Receptors, TNF-Related Apoptosis-Inducing Ligand/chemistry
- Receptors, TNF-Related Apoptosis-Inducing Ligand/metabolism
- Signal Transduction
- TNF-Related Apoptosis-Inducing Ligand/chemistry
- TNF-Related Apoptosis-Inducing Ligand/pharmacology
- Xenograft Model Antitumor Assays
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Affiliation(s)
| | | | - Tzu-Hsuan Huang
- Therapeutic Innovation Unit, Amgen Inc., Cambridge, MA 02142, USA
| | - Julia Piasecki
- Therapeutic Innovation Unit, Amgen Inc., Seattle, WA 98119, USA
| | - Tammy L Bush
- Therapeutic Innovation Unit, Amgen Inc., Cambridge, MA 02142, USA
| | - Timothy Sullivan
- Therapeutic Innovation Unit, Amgen Inc., Cambridge, MA 02142, USA
| | - Ian N Foltz
- Department of Biologic Discovery, Amgen British Columbia, Burnaby, BC V5A 1V7, Canada
| | - Wesley Chang
- Department of Clinical Immunology, Amgen Inc., South San Francisco, CA 94080, USA
| | | | - Thu Dang
- Therapeutic Innovation Unit, Amgen Inc., Cambridge, MA 02142, USA
| | - Jason W O'Neill
- Department of Biologic Optimization, Amgen Inc., Seattle, WA 98119, USA
| | - Rommel Mallari
- Department of Molecular Structure and Characterization, Amgen, South San Francisco, CA, 94080, USA
| | - Xiaoning Zhao
- Department of Molecular Structure and Characterization, Amgen, South San Francisco, CA, 94080, USA
| | | | - John M Rossi
- Department of Molecular Sciences and Computational Biology, Amgen Inc., Thousand Oaks, CA 91320, USA
| | - Alexander M Long
- Department of Molecular Structure and Characterization, Amgen Inc., Cambridge, MA 02142, USA
| | - Xin Huang
- Department of Molecular Structure and Characterization, Amgen Inc., Cambridge, MA 02142, USA
| | - Pamela M Holland
- Therapeutic Innovation Unit, Amgen Inc., Cambridge, MA 02142, USA.
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9
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Wang Y, Zhu J, Liu J(J, Chen X, Mihalic J, Deignan J, Yu M, Sun D, Kayser F, McGee LR, Lo MC, Chen A, Zhou J, Ye Q, Huang X, Long AM, Yakowec P, Oliner JD, Olson SH, Medina JC. Optimization beyond AMG 232: Discovery and SAR of sulfonamides on a piperidinone scaffold as potent inhibitors of the MDM2-p53 protein–protein interaction. Bioorg Med Chem Lett 2014; 24:3782-5. [DOI: 10.1016/j.bmcl.2014.06.073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 06/20/2014] [Accepted: 06/23/2014] [Indexed: 01/27/2023]
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10
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Gonzalez AZ, Li Z, Beck HP, Canon J, Chen A, Chow D, Duquette J, Eksterowicz J, Fox BM, Fu J, Huang X, Houze J, Jin L, Li Y, Ling Y, Lo MC, Long AM, McGee LR, McIntosh J, Oliner JD, Osgood T, Rew Y, Saiki AY, Shaffer P, Wortman S, Yakowec P, Yan X, Ye Q, Yu D, Zhao X, Zhou J, Olson SH, Sun D, Medina JC. Novel Inhibitors of the MDM2-p53 Interaction Featuring Hydrogen Bond Acceptors as Carboxylic Acid Isosteres. J Med Chem 2014; 57:2963-88. [DOI: 10.1021/jm401911v] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Xin Huang
- Department
of Therapeutic Discovery, Amgen Inc., 360 Binney Street Cambridge, Massachusetts 02142, United States
| | | | | | | | | | | | - Alexander M. Long
- Department
of Therapeutic Discovery, Amgen Inc., 360 Binney Street Cambridge, Massachusetts 02142, United States
| | | | | | | | | | | | | | - Paul Shaffer
- Department
of Therapeutic Discovery, Amgen Inc., 360 Binney Street Cambridge, Massachusetts 02142, United States
| | | | - Peter Yakowec
- Department
of Therapeutic Discovery, Amgen Inc., 360 Binney Street Cambridge, Massachusetts 02142, United States
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11
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Gonzalez AZ, Eksterowicz J, Bartberger MD, Beck HP, Canon J, Chen A, Chow D, Duquette J, Fox BM, Fu J, Huang X, Houze JB, Jin L, Li Y, Li Z, Ling Y, Lo MC, Long AM, McGee LR, McIntosh J, McMinn DL, Oliner JD, Osgood T, Rew Y, Saiki AY, Shaffer P, Wortman S, Yakowec P, Yan X, Ye Q, Yu D, Zhao X, Zhou J, Olson SH, Medina JC, Sun D. Selective and potent morpholinone inhibitors of the MDM2-p53 protein-protein interaction. J Med Chem 2014; 57:2472-88. [PMID: 24548297 DOI: 10.1021/jm401767k] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We previously reported the discovery of AMG 232, a highly potent and selective piperidinone inhibitor of the MDM2-p53 interaction. Our continued search for potent and diverse analogues led to the discovery of novel morpholinone MDM2 inhibitors. This change to a morpholinone core has a significant impact on both potency and metabolic stability compared to the piperidinone series. Within this morpholinone series, AM-8735 emerged as an inhibitor with remarkable biochemical potency (HTRF IC50 = 0.4 nM) and cellular potency (SJSA-1 EdU IC50 = 25 nM), as well as pharmacokinetic properties. Compound 4 also shows excellent antitumor activity in the SJSA-1 osteosarcoma xenograft model with an ED50 of 41 mg/kg. Lead optimization toward the discovery of this inhibitor as well as key differences between the morpholinone and the piperidinone series will be described herein.
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Affiliation(s)
- Ana Z Gonzalez
- Departments of †Therapeutic Discovery, ‡Pharmaceutics, and §Pharmacokinetics and Drug Metabolism, Amgen Inc. , 1120 Veterans Boulevard, South San Francisco, California 94080, United States
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12
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Sun D, Li Z, Rew Y, Gribble M, Bartberger MD, Beck HP, Canon J, Chen A, Chen X, Chow D, Deignan J, Duquette J, Eksterowicz J, Fisher B, Fox BM, Fu J, Gonzalez AZ, Gonzalez-Lopez De Turiso F, Houze JB, Huang X, Jiang M, Jin L, Kayser F, Liu JJ, Lo MC, Long AM, Lucas B, McGee LR, McIntosh J, Mihalic J, Oliner JD, Osgood T, Peterson ML, Roveto P, Saiki AY, Shaffer P, Toteva M, Wang Y, Wang YC, Wortman S, Yakowec P, Yan X, Ye Q, Yu D, Yu M, Zhao X, Zhou J, Zhu J, Olson SH, Medina JC. Discovery of AMG 232, a potent, selective, and orally bioavailable MDM2-p53 inhibitor in clinical development. J Med Chem 2014; 57:1454-72. [PMID: 24456472 DOI: 10.1021/jm401753e] [Citation(s) in RCA: 185] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We recently reported the discovery of AM-8553 (1), a potent and selective piperidinone inhibitor of the MDM2-p53 interaction. Continued research investigation of the N-alkyl substituent of this series, focused in particular on a previously underutilized interaction in a shallow cleft on the MDM2 surface, led to the discovery of a one-carbon tethered sulfone which gave rise to substantial improvements in biochemical and cellular potency. Further investigation produced AMG 232 (2), which is currently being evaluated in human clinical trials for the treatment of cancer. Compound 2 is an extremely potent MDM2 inhibitor (SPR KD = 0.045 nM, SJSA-1 EdU IC50 = 9.1 nM), with remarkable pharmacokinetic properties and in vivo antitumor activity in the SJSA-1 osteosarcoma xenograft model (ED50 = 9.1 mg/kg).
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Affiliation(s)
- Daqing Sun
- Departments of Therapeutic Discovery, ‡Pharmaceutics, and §Pharmacokinetics and Drug Metabolism, Amgen Inc. , 1120 Veterans Boulevard, South San Francisco, California, 94080, United States
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13
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Long AM, Smith-Williams J, Mayell S, Couriel J, Jones MO, Losty PD. S77 Benchmarking standards in paediatric pleural infection management. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.84] [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: 11/04/2022]
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14
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Gonzalez-Lopez de Turiso F, Sun D, Rew Y, Bartberger MD, Beck HP, Canon J, Chen A, Chow D, Correll TL, Huang X, Julian LD, Kayser F, Lo MC, Long AM, McMinn D, Oliner JD, Osgood T, Powers JP, Saiki AY, Schneider S, Shaffer P, Xiao SH, Yakowec P, Yan X, Ye Q, Yu D, Zhao X, Zhou J, Medina JC, Olson SH. Rational design and binding mode duality of MDM2-p53 inhibitors. J Med Chem 2013; 56:4053-70. [PMID: 23597064 DOI: 10.1021/jm400293z] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Structural analysis of both the MDM2-p53 protein-protein interaction and several small molecules bound to MDM2 led to the design and synthesis of tetrasubstituted morpholinone 10, an MDM2 inhibitor with a biochemical IC50 of 1.0 μM. The cocrystal structure of 10 with MDM2 inspired two independent optimization strategies and resulted in the discovery of morpholinones 16 and 27 possessing distinct binding modes. Both analogues were potent MDM2 inhibitors in biochemical and cellular assays, and morpholinone 27 (IC50 = 0.10 μM) also displayed suitable PK profile for in vivo animal experiments. A pharmacodynamic (PD) experiment in mice implanted with human SJSA-1 tumors showed p21(WAF1) mRNA induction (2.7-fold over vehicle) upon oral dosing of 27 at 300 mg/kg.
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15
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Abstract
Casein kinase 1 epsilon (CK1ε) and its closest homologue CK1δ are key regulators of diverse cellular processes. We report two crystal structures of PF4800567, a potent and selective inhibitor of CK1ε, bound to the kinase domains of human CK1ε and CK1δ as well as one apo CK1ε crystal structure. These structures provide a molecular basis for the strong and specific inhibitor interactions with CK1ε and suggest clues for further development of CK1δ inhibitors.
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Affiliation(s)
- Alexander M Long
- Department of Molecular Structure and Characterization, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142, USA
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16
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Michelsen K, Jordan JB, Lewis J, Long AM, Yang E, Rew Y, Zhou J, Yakowec P, Schnier PD, Huang X, Poppe L. Ordering of the N-terminus of human MDM2 by small molecule inhibitors. J Am Chem Soc 2012; 134:17059-67. [PMID: 22991965 DOI: 10.1021/ja305839b] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Restoration of p53 function through the disruption of the MDM2-p53 protein complex is a promising strategy for the treatment of various types of cancer. Here, we present kinetic, thermodynamic, and structural rationale for the remarkable potency of a new class of MDM2 inhibitors, the piperidinones. While these compounds bind to the same site as previously reported for small molecule inhibitors, such as the Nutlins, data presented here demonstrate that the piperidinones also engage the N-terminal region (residues 10-16) of human MDM2, in particular, Val14 and Thr16. This portion of MDM2 is unstructured in both the apo form of the protein and in MDM2 complexes with p53 or Nutlin, but adopts a novel β-strand structure when complexed with the piperidinones. The ordering of the N-terminus upon binding of the piperidinones extends the current model of MDM2-p53 interaction and provides a new route to rational design of superior inhibitors.
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Affiliation(s)
- Klaus Michelsen
- Molecular Structure & Characterization, Amgen, Inc., Thousand Oaks, California 91320, USA
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17
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Rew Y, Sun D, Gonzalez-Lopez De Turiso F, Bartberger MD, Beck HP, Canon J, Chen A, Chow D, Deignan J, Fox BM, Gustin D, Huang X, Jiang M, Jiao X, Jin L, Kayser F, Kopecky DJ, Li Y, Lo MC, Long AM, Michelsen K, Oliner JD, Osgood T, Ragains M, Saiki AY, Schneider S, Toteva M, Yakowec P, Yan X, Ye Q, Yu D, Zhao X, Zhou J, Medina JC, Olson SH. Structure-based design of novel inhibitors of the MDM2-p53 interaction. J Med Chem 2012; 55:4936-54. [PMID: 22524527 DOI: 10.1021/jm300354j] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Structure-based rational design led to the discovery of novel inhibitors of the MDM2-p53 protein-protein interaction. The affinity of these compounds for MDM2 was improved through conformational control of both the piperidinone ring and the appended N-alkyl substituent. Optimization afforded 29 (AM-8553), a potent and selective MDM2 inhibitor with excellent pharmacokinetic properties and in vivo efficacy.
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Affiliation(s)
- Yosup Rew
- Department of Therapeutic Discovery, Amgen Inc., 1120 Veterans Boulevard, South San Francisco, California 94080, United States
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18
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Yu V, Fisch T, Long AM, Tang J, Lee JH, Hierl M, Chen H, Yakowec P, Schwandner R, Emkey R. High-throughput TR-FRET assays for identifying inhibitors of LSD1 and JMJD2C histone lysine demethylases. ACTA ACUST UNITED AC 2011; 17:27-38. [PMID: 21859682 DOI: 10.1177/1087057111418228] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Lysine demethylase 1 (LSD1) and Jumonji C domain-containing oxygenase D2C (JMJD2C) participate in regulating the methylation status of histone H3 lysine residues. In some contexts, LSD1 and JMJD2C activity causes enhanced cellular proliferation, which may lead to tumorigenesis. The authors explored the utility of time-resolved fluorescence resonance energy transfer (TR-FRET) immunoassays, which employed peptides consisting of the first 21 amino acids of histone H3 in which lysine 4 (H3K4) or lysine 9 (H3K9) was methylated (me) to quantify LSD1 and JMJD2C activity. The LSD1 assay monitored demethylation of the H3K4me1 peptide using an antibody that recognizes H3K4me1 but not the unmethylated peptide product. The JMJD2C assay measured demethylation of H3K9me3 with an antibody that selectively recognizes H3K9me2. The optimized conditions resulted in robust assays (Z' > 0.7) that required only 3 to 6 nM of enzyme in a reaction volume of 6 to 10 µL. These assays were used to compare the activity of different LSD1 constructs and to determine the apparent K(m) of each JMJD2C substrate. Finally, both assays were used in a high-throughput setting for identifying demethylase inhibitors. Compounds discovered by these TR-FRET methods may lead to powerful tools for ascertaining the roles of demethylases in a cellular context and ultimately for potential cancer treatments.
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19
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Plant M, Dineen T, Cheng A, Long AM, Chen H, Morgenstern KA. Screening for lysine-specific demethylase-1 inhibitors using a label-free high-throughput mass spectrometry assay. Anal Biochem 2011; 419:217-27. [PMID: 21855527 DOI: 10.1016/j.ab.2011.07.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 06/30/2011] [Accepted: 07/03/2011] [Indexed: 11/30/2022]
Abstract
Posttranslational modifications on the N terminus of histone H3 act in a combinatorial fashion to control epigenetic responses to extracellular stimuli. Lysine-specific demethylase-1 (LSD1) represents an emerging epigenetic target class for the discovery of novel antitumor therapies. In this study, a high-throughput mass spectrometry (HTMS) assay was developed to measure LSD1-catalyzed demethylation of lysine-4 on several H3 substrates. The assay leverages RapidFire chromatography in line with a triple stage quadrupole detection method to measure multiple LSD1 substrate and product reactions from an assay well. This approach minimizes artifacts from fluorescence interference and eliminates the need for antibody specificity to methylated lysines. The assay was robust in a high-throughput screen of a focused library consisting of more than 56,000 unique chemical scaffolds with a median Z' of 0.76. Validated hits from the primary screen were followed up by successive rounds of virtual and HTMS screening to mine for related structures in a parent library consisting of millions of compounds. The screen resulted in the rapid discovery of multiple chemical classes amenable to medicinal chemistry optimization. This assay was further developed into a generic platform capable of rapidly screening epigenetic targets that use the N-terminal tail of histone H3 as a substrate.
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Affiliation(s)
- Matthew Plant
- Department of Lead Discovery, Biological Mass Spectrometry Screening Group, Amgen Inc., Cambridge, MA 02142, USA
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20
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Allen JG, Bourbeau MP, Wohlhieter GE, Bartberger MD, Michelsen K, Hungate R, Gadwood RC, Gaston RD, Evans B, Mann LW, Matison ME, Schneider S, Huang X, Yu D, Andrews PS, Reichelt A, Long AM, Yakowec P, Yang EY, Lee TA, Oliner JD. Discovery and optimization of chromenotriazolopyrimidines as potent inhibitors of the mouse double minute 2-tumor protein 53 protein-protein interaction. J Med Chem 2009; 52:7044-53. [PMID: 19856920 DOI: 10.1021/jm900681h] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Tumor protein 53 (p53) is a critical regulator of cell cycle and apoptosis that is frequently disabled in human tumors. In many tumor types, p53 is deleted or mutated, but in others p53 is inactivated by overexpression or amplification of its negative regulator mouse double minute 2 (MDM2). A high-throughput screening effort identified 6,7-bis(4-bromophenyl)-7,12-dihydro-6H-chromeno[4,3-d][1,2,4]triazolo[1,5-a]pyrimidine as a potent inhibitor of the MDM2-p53 protein-protein interaction. This screening hit was found to be chemically unstable and difficult to handle due to poor DMSO solubility. Co-crystallization with the target protein helped to direct further optimization and provided a tractable lead series of novel MDM2-p53 inhibitors. In cellular assays, these compounds were shown to upregulate p53 protein levels and p53 signaling and to cause p53-dependent inhibition of proliferation and apoptosis.
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Affiliation(s)
- John G Allen
- Chemistry Research and Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, USA.
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21
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Albrecht BK, Harmange JC, Bauer D, Berry L, Bode C, Boezio AA, Chen A, Choquette D, Dussault I, Fridrich C, Hirai S, Hoffman D, Larrow JF, Kaplan-Lefko P, Lin J, Lohman J, Long AM, Moriguchi J, O'Connor A, Potashman MH, Reese M, Rex K, Siegmund A, Shah K, Shimanovich R, Springer SK, Teffera Y, Yang Y, Zhang Y, Bellon SF. Discovery and optimization of triazolopyridazines as potent and selective inhibitors of the c-Met kinase. J Med Chem 2008; 51:2879-82. [PMID: 18426196 DOI: 10.1021/jm800043g] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tumorigenesis is a multistep process in which oncogenes play a key role in tumor formation, growth, and maintenance. MET was discovered as an oncogene that is activated by its ligand, hepatocyte growth factor. Deregulated signaling in the c-Met pathway has been observed in multiple tumor types. Herein we report the discovery of potent and selective triazolopyridazine small molecules that inhibit c-Met activity.
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22
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La DS, Belzile J, Bready JV, Coxon A, DeMelfi T, Doerr N, Estrada J, Flynn JC, Flynn SR, Graceffa RF, Harriman SP, Larrow JF, Long AM, Martin MW, Morrison MJ, Patel VF, Roveto PM, Wang L, Weiss MM, Whittington DA, Teffera Y, Zhao Z, Polverino AJ, Harmange JC. Novel 2,3-Dihydro-1,4-Benzoxazines as Potent and Orally Bioavailable Inhibitors of Tumor-Driven Angiogenesis∥. J Med Chem 2008; 51:1695-705. [PMID: 18311900 DOI: 10.1021/jm701129j] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Potashman MH, Bready J, Coxon A, DeMelfi TM, DiPietro L, Doerr N, Elbaum D, Estrada J, Gallant P, Germain J, Gu Y, Harmange JC, Kaufman SA, Kendall R, Kim JL, Kumar GN, Long AM, Neervannan S, Patel VF, Polverino A, Rose P, van der Plas S, Whittington D, Zanon R, Zhao H. Design, Synthesis, and Evaluation of Orally Active Benzimidazoles and Benzoxazoles as Vascular Endothelial Growth Factor-2 Receptor Tyrosine Kinase Inhibitors. J Med Chem 2008. [DOI: 10.1021/jm800006z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Bellon SF, Kaplan-Lefko P, Yang Y, Zhang Y, Moriguchi J, Rex K, Johnson CW, Rose PE, Long AM, O'Connor AB, Gu Y, Coxon A, Kim TS, Tasker A, Burgess TL, Dussault I. c-Met inhibitors with novel binding mode show activity against several hereditary papillary renal cell carcinoma-related mutations. J Biol Chem 2007; 283:2675-83. [PMID: 18055465 DOI: 10.1074/jbc.m705774200] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
c-Met is a receptor tyrosine kinase often deregulated in human cancers, thus making it an attractive drug target. One mechanism by which c-Met deregulation leads to cancer is through gain-of-function mutations. Therefore, small molecules capable of targeting these mutations could offer therapeutic benefits for affected patients. SU11274 was recently described and reported to inhibit the activity of the wild-type and some mutant forms of c-Met, whereas other mutants are resistant to inhibition. We identified a novel series of c-Met small molecule inhibitors that are active against multiple mutants previously identified in hereditary papillary renal cell carcinoma patients. AM7 is active against wild-type c-Met as well as several mutants, inhibits c-Met-mediated signaling in MKN-45 and U-87 MG cells, and inhibits tumor growth in these two models grown as xenografts. The crystal structures of AM7 and SU11274 bound to unphosphorylated c-Met have been determined. The AM7 structure reveals a novel binding mode compared with other published c-Met inhibitors and SU11274. The molecule binds the kinase linker and then extends into a new hydrophobic binding site. This binding site is created by a significant movement of the C-helix and so represents an inactive conformation of the c-Met kinase. Thus, our results demonstrate that it is possible to identify and design inhibitors that will likely be active against mutants found in different cancers.
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Affiliation(s)
- Steven F Bellon
- Department of Molecular Structure, Amgen Inc., Thousand Oaks, CA 91320, USA
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25
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Potashman MH, Bready J, Coxon A, DeMelfi TM, DiPietro L, Doerr N, Elbaum D, Estrada J, Gallant P, Germain J, Gu Y, Harmange JC, Kaufman SA, Kendall R, Kim JL, Kumar GN, Long AM, Neervannan S, Patel VF, Polverino A, Rose P, Plas SVD, Whittington D, Zanon R, Zhao H. Design, synthesis, and evaluation of orally active benzimidazoles and benzoxazoles as vascular endothelial growth factor-2 receptor tyrosine kinase inhibitors. J Med Chem 2007; 50:4351-73. [PMID: 17696416 DOI: 10.1021/jm070034i] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.1] [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: 11/28/2022]
Abstract
Inhibition of the VEGF signaling pathway has become a valuable approach in the treatment of cancers. Guided by X-ray crystallography and molecular modeling, a series of 2-aminobenzimidazoles and 2-aminobenzoxazoles were identified as potent inhibitors of VEGFR-2 (KDR) in both enzymatic and HUVEC cellular proliferation assays. In this report we describe the synthesis and structure-activity relationship of a series of 2-aminobenzimidazoles and benzoxazoles, culminating in the identification of benzoxazole 22 as a potent and selective VEGFR-2 inhibitor displaying a good pharmacokinetic profile. Compound 22 demonstrated efficacy in both the murine matrigel model for vascular permeability (79% inhibition observed at 100 mg/kg) and the rat corneal angiogenesis model (ED(50) = 16.3 mg/kg).
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Affiliation(s)
- Michele H Potashman
- Department of Medicinal Chemistry, Amgen Inc., One Kendall Square, Building 1000, Cambridge, Massachusetts 02139, USA.
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26
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Hodous BL, Geuns-Meyer SD, Hughes PE, Albrecht BK, Bellon S, Caenepeel S, Cee VJ, Chaffee SC, Emery M, Fretland J, Gallant P, Gu Y, Johnson RE, Kim JL, Long AM, Morrison M, Olivieri PR, Patel VF, Polverino A, Rose P, Wang L, Zhao H. Synthesis, structural analysis, and SAR studies of triazine derivatives as potent, selective Tie-2 inhibitors. Bioorg Med Chem Lett 2007; 17:2886-9. [PMID: 17350837 DOI: 10.1016/j.bmcl.2007.02.067] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2006] [Revised: 02/16/2007] [Accepted: 02/21/2007] [Indexed: 11/23/2022]
Abstract
A novel class of selective Tie-2 inhibitors was derived from a multi-kinase inhibitor 1. By reversing the amide connectivity and incorporating aminotriazine or aminopyridine hinge-binding moieties, excellent Tie-2 potency and KDR selectivity could be achieved with 3-substituted terminal aryl rings. X-ray co-crystal structure analysis aided inhibitor design. This series was evaluated on the basis of potency, selectivity, and rat pharmacokinetic parameters.
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Affiliation(s)
- Brian L Hodous
- Department of Medicinal Chemistry, Amgen Inc., One Kendall Square, Building 1000, Cambridge, MA 02139, USA.
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27
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Hodous BL, Geuns-Meyer SD, Hughes PE, Albrecht BK, Bellon S, Bready J, Caenepeel S, Cee VJ, Chaffee SC, Coxon A, Emery M, Fretland J, Gallant P, Gu Y, Hoffman D, Johnson RE, Kendall R, Kim JL, Long AM, Morrison M, Olivieri PR, Patel VF, Polverino A, Rose P, Tempest P, Wang L, Whittington DA, Zhao H. Evolution of a Highly Selective and Potent 2-(Pyridin-2-yl)-1,3,5-triazine Tie-2 Kinase Inhibitor. J Med Chem 2007; 50:611-26. [PMID: 17253678 DOI: 10.1021/jm061107l] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [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: 11/29/2022]
Abstract
Inhibition of angiogenesis is a promising and clinically validated approach for limiting tumor growth and survival. The receptor tyrosine kinase Tie-2 is expressed almost exclusively in the vascular endothelium and is required for developmental angiogenesis and vessel maturation. However, the significance of Tie-2 signaling in tumor angiogenesis is not well understood. In order to evaluate the therapeutic utility of inhibiting Tie-2 signaling, we developed a series of potent and orally bioavailable small molecule Tie-2 kinase inhibitors with selectivity over other kinases, especially those that are believed to be important for tumor angiogenesis. Our earlier work provided pyridinyl pyrimidine 6 as a potent, nonselective Tie-2 inhibitor that was designed on the basis of X-ray cocrystal structures of KDR inhibitors 34 (triazine) and 35 (nicotinamide). Lead optimization resulted in pyridinyl triazine 63, which exhibited >30-fold selectivity over a panel of kinases, good oral exposure, and in vivo inhibition of Tie-2 phosphorylation.
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Affiliation(s)
- Brian L Hodous
- Department of Medicinal Chemistry, Amgen Inc., One Kendall Square, Building 1000, Cambridge, Massachusetts 02139-1581, USA.
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Cee VJ, Albrecht BK, Geuns-Meyer S, Hughes P, Bellon S, Bready J, Caenepeel S, Chaffee SC, Coxon A, Emery M, Fretland J, Gallant P, Gu Y, Hodous BL, Hoffman D, Johnson RE, Kendall R, Kim JL, Long AM, McGowan D, Morrison M, Olivieri PR, Patel VF, Polverino A, Powers D, Rose P, Wang L, Zhao H. Alkynylpyrimidine amide derivatives as potent, selective, and orally active inhibitors of Tie-2 kinase. J Med Chem 2007; 50:627-40. [PMID: 17253679 DOI: 10.1021/jm061112p] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [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: 11/29/2022]
Abstract
The recognition that aberrant angiogenesis contributes to the pathology of inflammatory diseases, cancer, and myocardial ischemia has generated considerable interest in the molecular mechanisms that regulate blood vessel growth. The receptor tyrosine kinase Tie-2 is expressed primarily by vascular endothelial cells and is critical for embryonic vasculogenesis. Interference with the Tie-2 pathway by diverse blocking agents such as soluble Tie-2 receptors, anti-Tie-2 intrabodies, anti-Ang-2 antibodies, and peptide-Fc conjugates has been shown to suppress tumor growth in xenograft studies. An alternative strategy for interfering with the Tie-2 signaling pathway involves direct inhibition of the kinase functions of the Tie-2 receptor. Herein we describe the development of alkynylpyrimidine amide derivatives as potent, selective, and orally available ATP-competitive inhibitors of Tie-2 autophosphorylation.
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Affiliation(s)
- Victor J Cee
- Department of Medicinal Chemistry, Amgen Inc., One Kendall Square, Bldg. 1000, Cambridge, Massachusetts 02139, USA.
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Cowan CA, Lazenby HC, Martin AB, McDonnell PA, Sensenig AL, Smith CE, Whittle LS, Zezza MA, Donham CS, Long AM, Stewart MW. National health expenditures, 1999. Health Care Financ Rev 2001; 22:77-110. [PMID: 12378783 PMCID: PMC4194743] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The health care spending share of gross domestic product (GDP) remained steady between 1993 and 1999 as moderate-to-strong economic growth coincided with a rapid shift to managed care. This shift, along with decelerating growth in Medicare spending, appears to have generated a mostly one-time saving that lowered aggregate health expenditure growth.
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Cowan CA, Lazenby HC, Martin AB, McDonnell PA, Sensenig AL, Stiller JM, Whittle LS, Kotova KA, Zezza MA, Donham CS, Long AM, Stewart MW. National health expenditures, 1998. Health Care Financ Rev 1999; 21:165-210. [PMID: 11481774 PMCID: PMC4194653] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
In 1998, national health care expenditures reached $1.1 trillion, an increase of 5.6 percent from the previous year. This marked the fifth consecutive year of spending growth under 6 percent. Underlying the stability of the overall growth, major changes began taking place within the Nation's health care system. Public payers felt the initial effects of the Balanced Budget Act of 1997 (BBA), and private payers experienced increased health care costs and increased premium growth.
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Affiliation(s)
- C A Cowan
- Office of the Actuary, National Health Statistics Group, Health Care Financing Administration, 7500 Security Boulevard, N3-02-02, Baltimore, MD 21244-1850, USA
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31
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Abstract
DNA polymerases change their specificity for nucleotide substrates with each catalytic cycle, while achieving error frequencies in the range of 10(-5) to 10(-6). Here we present a 2.2 A crystal structure of the replicative DNA polymerase from bacteriophage T7 complexed with a primer-template and a nucleoside triphosphate in the polymerase active site. The structure illustrates how nucleotides are selected in a template-directed manner, and provides a structural basis for a metal-assisted mechanism of phosphoryl transfer by a large group of related polymerases.
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Affiliation(s)
- S Doublié
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA
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32
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Braden BR, Cowan CA, Lazenby HC, Martin AB, McDonnell PA, Sensenig AL, Stiller JM, Whittle LS, Donham CS, Long AM, Stewart MW. National health expenditures, 1997. Health Care Financ Rev 1998; 20:83-126. [PMID: 10387428 PMCID: PMC4194531] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In 1997 health spending in the United States increased just 4.8 percent to $1.1 trillion. As a share of gross domestic product (GDP), national health expenditures (NHE) absorbed 13.5 percent of the country's output in 1997--a share that has remained relatively constant for 5 years. Despite the relative stability in recent years, signs of changing trends are emerging.
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Affiliation(s)
- B R Braden
- U.S. Health Care Financing Administration, Office of the Actuary, USA
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33
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Abstract
BACKGROUND The central player in the replication of RNA viruses is the viral RNA-dependent RNA polymerase. The 53 kDa poliovirus polymerase, together with other viral and possibly host proteins, carries out viral RNA replication in the host cell cytoplasm. RNA-dependent RNA polymerases comprise a distinct category of polymerases that have limited sequence similarity to reverse transcriptases (RNA-dependent DNA polymerases) and perhaps also to DNA-dependent polymerases. Previously reported structures of RNA-dependent DNA polymerases, DNA-dependent DNA polymerases and a DNA-dependent RNA polymerase show that structural and evolutionary relationships exist between the different polymerase categories. RESULTS We have determined the structure of the RNA-dependent RNA polymerase of poliovirus at 2.6 A resolution by X-ray crystallography. It has the same overall shape as other polymerases, commonly described by analogy to a right hand. The structures of the 'fingers' and 'thumb' subdomains of poliovirus polymerase differ from those of other polymerases, but the palm subdomain contains a core structure very similar to that of other polymerases. This conserved core structure is composed of four of the amino acid sequence motifs described for RNA-dependent polymerases. Structure-based alignments of these motifs has enabled us to modify and extend previous sequence and structural alignments so as to relate sequence conservation to function. Extensive regions of polymerase-polymerase interactions observed in the crystals suggest an unusual higher order structure that we believe is important for polymerase function. CONCLUSIONS As a first example of a structure of an RNA-dependent RNA polymerase, the poliovirus polymerase structure provides for a better understanding of polymerase structure, function and evolution. In addition, it has yielded insights into an unusual higher order structure that may be critical for poliovirus polymerase function.
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Affiliation(s)
- J L Hansen
- Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309, USA
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34
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Levit KR, Lazenby HC, Braden BR, Cowan CA, Sensenig AL, McDonnell PA, Stiller JM, Won DK, Martin AB, Sivarajan ML, Donham CS, Long AM, Stewart MW. National health expenditures, 1996. Health Care Financ Rev 1997; 19:161-200. [PMID: 10179997 PMCID: PMC4194488] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The national health expenditures (NHE) series presented in this report for 1960-96 provides a view of the economic history of health care in the United States through spending for health care services and the sources financing that care. In 1996 NHE topped $1 trillion. At the same time, spending grew at the slowest rate, 4.4 percent, ever recorded in the current series. For the first time, this article presents estimates of Medicare managed care payments by type of service, as well as nursing home and home health spending in hospital-based facilities.
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Affiliation(s)
- K R Levit
- Office of the Actuary, Health Care Financing Administration, Baltimore, MD 21244-4850, USA
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Levit KR, Lazenby HC, Sivarajan L, Stewart MW, Braden BR, Cowan CA, Donham CS, Long AM, McDonnell PA, Sensenig AL, Stiller JM, Won DK. National health expenditures, 1994. Health Care Financ Rev 1996; 17:205-42. [PMID: 10158731 PMCID: PMC4193598] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
This article presents data on health care spending for the United States, covering expenditures for various types of medical services and products and their sources of funding from 1960 to 1994. Although these statistics for 1994 show the slowest growth in more than three decades, health spending continued to grow faster than the overall economy. The Federal Government continued to fund an increasing share of health care expenditures in 1994, offset by a falling share from out-of-pocket sources. Shares paid by State and local governments and by other private payers including private health insurance remained unchanged from 1993.
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Affiliation(s)
- K R Levit
- Office of the Actuary, Health Care Financing Administration, USA
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36
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Levit KR, Lazenby HC, Braden BR, Cowan CA, McDonnell PA, Sivarajan L, Stiller JM, Won DK, Donham CS, Long AM, Stewart MW. National health expenditures, 1995. Health Care Financ Rev 1996; 18:175-214. [PMID: 10165031 PMCID: PMC4193619] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
Abstract
This article presents data on health care spending for the United States, covering expenditures for various types of medical services and products and their sources of funding from 1960 to 1995. In 1995, $988.5 billion was spent to purchase health care in the United States, up 5.5 percent from 1994. Growth in spending between 1993 and 1995 was the slowest in more than three decades, primarily because of slow growth in private health insurance and out-of-pocket spending. As a result, the share of health spending funded by private sources fell, reflecting the influence of increased enrollment in managed care plans.
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Affiliation(s)
- K R Levit
- Health Care Financing Administration, Baltimore, MD 21244, USA.
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Abstract
This report describes a case of hydrometrocolpos presenting antenatally as a cystic mass arising from the pelvis of a female fetus. The baby was born at 33 weeks and died within an hour due to pulmonary hypoplasia. Postmortem examination demonstrated hydrometrocolpos, dense adhesions in the abdomen and pulmonary hypoplasia.
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Affiliation(s)
- R Saxena
- Department of Histopathology, Farnborough Hospital, Kent, UK
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Abstract
Experience with an indwelling subcutaneous Teflon cannula for insulin delivery to 10 children with diabetes mellitus is described. There were no significant complications during a one year trial period. The device may particularly benefit children during the early phase after diagnosis and for those with true needle phobia.
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Affiliation(s)
- A M Long
- Department of Child Health, University of Wales, College of Medicine, Cardiff
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39
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Abstract
Derbyshire was one of the best known centres of endemic goitre in Great Britain. Some 160 km from the coast in the direction of the prevailing wind, topsoils in the area are generally low in iodine (mean = 5.44 mg l/kg). Weathered rocks and soils are richer in iodine than the unweathered bedrocks, with soils developed over limestones being richer than those over sandstones, shales and dolomites. Highest iodine contents in soil profiles over limestones occur in the upper horizons while over sandstones, iodine concentrates in the lower horizons. The major cause of endemic goitre in north Derbyshire is likely to be relatively low levels of iodine, while the calcium rich soils of the area may contribute by reducing plant iodine uptake.
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Affiliation(s)
- R Fuge
- Centre for Applied Geochemistry, Institute of Earth Studies, University College of Wales, SY23 3DB, Aberystwyth, Dyfed, Wales
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40
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Affiliation(s)
- P J Fleming
- University of Bristol, Department of Child Health, Bristol Maternity Hospital, United Kingdom
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41
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Abstract
A simple model of a feedback loop controlling ventilation is analysed. This model is intended to describe the response of the system, initially at equilibrium, to a sudden fall in CO2 concentration in the lung, brought about by a deep sigh. A previous paper described the model in detail and the general method of analysis. Here we continue the discussion of stability, first in terms of local stability after a small displacement from equilibrium and then by computer simulation to illustrate the behaviour after large displacements. The local analysis is used to select representative sets of system parameters to illustrate the different types of trajectory obtained by computer simulation. When the equilibrium point is stable the response to a disturbance is overdamped, underdamped or critically damped. When the equilibrium point is unstable the system responds by going into a limit cycle. The transition between these two cases proceeds via a Hopf Bifurcation. The limit cycle type of ventilatory pattern, i.e. a periodic, underdamped waxing and waning of ventilation is commonly seen in premature infants and in term infants between 1 and 6 months of age.
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Abstract
A case of fatal neonatal infection with enteric cytopathogenic human orphan virus (echovirus) type 6 is presented. The measures taken to prevent further spread of infection with special reference to the use of human normal immunoglobulin are described.
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Wyrwicka W, Long AM. The effect of companion on consumption of ethanol solution in cats. Pavlov J Biol Sci 1983; 18:49-53. [PMID: 6856364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Social influences on drinking ethanol solution were studied in two cats ("drinkers") who voluntarily drank small amounts of 10% ethanol solution in milk and three other cats ("nondrinkers") who served as companions to the drinkers. A 15-minute session was conducted daily in a compartment divided into two even parts with a transparent Plexiglass partition. The cats were introduced to the compartment either singly or in pairs. Each pair consisted either of two drinkers or one drinker and one nondrinker. Each cat of the pair was placed in one part of the compartment; the cats could see each other, but they could not make physical contact. Each drinker was offered 10% ethanol solution in milk, while each nondrinker was given plain milk, and the amount of consumption was measured. A series of five to ten sessions with a drinker was followed by a series of sessions with a nondrinker or with no companion. There were a total of 13 series of sessions for each drinker. A statistical analysis of the data showed that, in most series, the mean amount of consumption of ethanol solution was significantly higher in the presence of a companion (either drinker or nondrinker) than in its absence.
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