1
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Peng X, Holler CJ, Alves AMF, Oliviera MG, Speake M, Pugliese A, Oskouei MR, de Freitas ID, Chen AYP, Gallegos R, McTighe SM, Koenig G, Hurst RS, Blain JF, Lanter JC, Burnett DA. Discovery and characterization of novel TRPML1 agonists. Bioorg Med Chem Lett 2024; 98:129595. [PMID: 38141860 DOI: 10.1016/j.bmcl.2023.129595] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/30/2023] [Accepted: 12/17/2023] [Indexed: 12/25/2023]
Abstract
Screening a library of >100,000 compounds identified the substituted tetrazole compound 1 as a selective TRPML1 agonist. Both enantiomers of compound 1 were separated and profiled in vitro and in vivo. Their selectivity, ready availability and CNS penetration should enable them to serve as the tool compounds of choice in future TRPML1 channel activation studies. SAR studies on conformationally locked macrocyclic analogs further improved the TRPML1 agonist potency while retaining the selectivity.
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Affiliation(s)
- Xiaowen Peng
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA.
| | | | - Anna-Maria F Alves
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Michelle G Oliviera
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Michael Speake
- BioAscent Discovery Ltd, Bo'Ness Rd, Chapelhall, Motherwell ML1 5UH, United Kingdom
| | - Angelo Pugliese
- BioAscent Discovery Ltd, Bo'Ness Rd, Chapelhall, Motherwell ML1 5UH, United Kingdom
| | - Mina R Oskouei
- Symeres Inc, Kerkenbos 1013, 6546 BB Nijmegen, the Netherlands
| | | | - Angela Y-P Chen
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Richard Gallegos
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Stephanie M McTighe
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Gerhard Koenig
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Raymond S Hurst
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Jean-François Blain
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - James C Lanter
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Duane A Burnett
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
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2
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Peng X, Lanter JC, Y-P Chen A, Brand MA, Wozniak MK, Hoekman S, Longin O, Regeling H, Zonneveld W, P L Bell R, Koenig G, Hurst RS, Blain JF, Burnett DA. Discovery of oxazoline enhancers of cellular progranulin release. Bioorg Med Chem Lett 2023; 80:129048. [PMID: 36368496 DOI: 10.1016/j.bmcl.2022.129048] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 07/22/2022] [Revised: 10/28/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022]
Abstract
Phenotypic screening of an annotated small molecule library and initial SAR studies identified compound 2 as a robust enhancer of progranulin secretion. Detailed SAR development on conformationally restricted carbamate isosteres led to the identification of compound 60 with a 3-fold improvement in BV-2 potency and a 9-fold decrease in hERG inhibition over compound 2, substantially improving this important margin of safety relative to compound 2.
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Affiliation(s)
- Xiaowen Peng
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA.
| | - James C Lanter
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Angela Y-P Chen
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Morgan A Brand
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Mary K Wozniak
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Steven Hoekman
- Symeres, Kerkenbos 1013, 6546 BB Nijmegen, the Netherlands
| | - Ondřej Longin
- Symeres, Kerkenbos 1013, 6546 BB Nijmegen, the Netherlands
| | | | - Wim Zonneveld
- Symeres, Kerkenbos 1013, 6546 BB Nijmegen, the Netherlands
| | - Roel P L Bell
- Symeres, Kerkenbos 1013, 6546 BB Nijmegen, the Netherlands
| | - Gerhard Koenig
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Raymond S Hurst
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Jean-François Blain
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Duane A Burnett
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
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3
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Blain J, Chen AY, Brand MA, Lanter JC, Holler CJ, Brendel JK, Koenig G, Burnett DA, Hurst RS. A Novel In Vivo‐Active Small Molecule Inducer of Progranulin for the Treatment of Frontotemporal Dementia. Alzheimers Dement 2022. [DOI: 10.1002/alz.061924] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Bursavich MG, Harrison BA, Acharya R, Costa DE, Freeman EA, Hrdlicka LA, Jin H, Kapadnis S, Moffit JS, Murphy D, Nolan SJ, Patzke H, Tang C, Van Voorhies HE, Wen M, Koenig G, Blain JF, Burnett DA. Discovery of the Oxadiazine FRM-024: A Potent CNS-Penetrant Gamma Secretase Modulator. J Med Chem 2021; 64:14426-14447. [PMID: 34550687 DOI: 10.1021/acs.jmedchem.1c00904] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The recent approval of aducanumab for Alzheimer's disease has heightened the interest in therapies targeting the amyloid hypothesis. Our research has focused on identification of novel compounds to improve amyloid processing by modulating gamma secretase activity, thereby addressing a significant biological deficit known to plague the familial form of the disease. Herein, we describe the design, synthesis, and optimization of new gamma secretase modulators (GSMs) based on previously reported oxadiazine 1. Potency improvements with a focus on predicted and measured properties afforded high-quality compounds further differentiated via robust Aβ42 reductions in both rodents and nonhuman primates. Extensive preclinical profiling, efficacy studies, and safety studies resulted in the nomination of FRM-024, (+)-cis-5-(4-chlorophenyl)-6-cyclopropyl-3-(6-methoxy-5-(4-methyl-1H-imidazole-1-yl)pyridin-2-yl)-5,6-dihydro-4H-1,2,4-oxadiazine, as a GSM preclinical candidate for familial Alzheimer's disease.
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Affiliation(s)
- Matthew G Bursavich
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Bryce A Harrison
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Raksha Acharya
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Donald E Costa
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Emily A Freeman
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Lori A Hrdlicka
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Hong Jin
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Sudarshan Kapadnis
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Jeffrey S Moffit
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Deirdre Murphy
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Scott J Nolan
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Holger Patzke
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Cuyue Tang
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | | | - Melody Wen
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Gerhard Koenig
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Jean-François Blain
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Duane A Burnett
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
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5
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Eng M, Al-Darzi W, Basir M, Singh-Kucukarslan G, Villablanca P, Koenig G, Alaswad K, Cowger J, Oneill W. Left atrial venous arterial extracorporeal membrane oxygenation for biventricular failure in cardiogenic shock. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1061] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Cardiogenic shock complicated by biventricular (BIV) heart failure is associated with high mortality. Venous-arterial extra-corporeal membrane oxygenation is limited by the increase of left ventricular (LV) afterload. Complex configurations of paired circulatory support devices have been used with mixed results due to vascular access complications. One way to simply vascular access is to place a transseptal cannula under echocardiographic guidance with a long fenestrated segment enabling simultaneous left and right sided unloading known as left-atrial venous arterial (LAVA) ECMO.
Purpose
We aimed to review the safety and outcomes of LAVA ECMO utilized for shock at our institution.
Methods
Retrospective analysis of our Hospital Cath Lab Database yielded 6 patients undergoing LAVA-ECMO for shock from 7/2020–3/2021. Patient characteristics, procedural data and outcomes were analyzed. Variables are either expressed as proportions or medians (Interquartile range; IQR).
Results
Median age was 55.5 years (IQR, 51–61) and most patients were men (83.3%). Median baseline LV ejection fraction was 38% (IQR, 23–56%) and all had right ventricular dysfunction. 4/6 (66.7%) had severe valvular dysfunction including aortic regurgitation (2/6), mitral regurgitation (2/6) and mitral stenosis (1/6). One patient had a LV thrombus and hemodynamics necessitated LV unloading. Intracardiac echocardiography was used to guide the transseptal puncture in 5/6 (83%). Transesophageal echocardiography was used in one case. Procedural outcomes and hemodynamic variables are outlined in Tables 1 and 2 consecutively. One case of limb ischemia resulted from an embolus in the contralateral limb. LAVA-ECMO bridged 83% of patients to valve replacement, durable ventricular support or heart transplant (Table 1).
Conclusions
LAVA-ECMO provides BIV support with a single circuit and successfully bridged patients without direct complications. Given the safety, efficacy and simplified configuration of LAVA-ECMO, prospective studies are indicated.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- M Eng
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - W Al-Darzi
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - M Basir
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | | | - P Villablanca
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - G Koenig
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - K Alaswad
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - J Cowger
- Henry Ford Hospital, Cardiology, Detroit, United States of America
| | - W Oneill
- Henry Ford Hospital, Cardiology, Detroit, United States of America
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6
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Ljubenkov PA, Edwards L, Iaccarino L, La Joie R, Rojas JC, Koestler M, Harris B, Boeve BF, Borroni B, van Swieten JC, Grossman M, Pasquier F, Frisoni GB, Mummery CJ, Vandenberghe R, Le Ber I, Hannequin D, McGinnis SM, Auriacombe S, Onofrj M, Goodman IJ, Riordan HJ, Wisniewski G, Hesterman J, Marek K, Haynes BA, Patzke H, Koenig G, Hilt D, Moebius H, Boxer AL. Effect of the Histone Deacetylase Inhibitor FRM-0334 on Progranulin Levels in Patients With Progranulin Gene Haploinsufficiency: A Randomized Clinical Trial. JAMA Netw Open 2021; 4:e2125584. [PMID: 34559230 PMCID: PMC8463943 DOI: 10.1001/jamanetworkopen.2021.25584] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
IMPORTANCE Histone deacetylase inhibitors have been repeatedly shown to elevate progranulin levels in preclinical models. This report describes the first randomized clinical trial of a histone deacetylase inhibitor in frontotemporal dementia (FTD) resulting from progranulin (GRN) gene variations. OBJECTIVE To characterize the safety, tolerability, plasma pharmacokinetics, and pharmacodynamic effects of oral FRM-0334 on plasma progranulin and other exploratory biomarkers, including fluorodeoxyglucose (FDG)-positron emission tomography (PET), in individuals with GRN haploinsufficiency. DESIGN, SETTING, AND PARTICIPANTS In this randomized, double-blind, placebo-controlled, dose-escalating, phase 2a safety, tolerability, and pharmacodynamic clinical study, 2 doses of a histone deacetylase inhibitor (FRM-0334) were administered to participants with prodromal to moderate FTD with granulin variations. Participants were recruited from January 13, 2015, to April 13, 2016. The study included 27 participants with prodromal (n = 8) or mild-to-moderate symptoms of FTD (n = 19) and heterozygous pathogenic variations in GRN and was conducted at multiple centers in North America, the UK, and the European Union. Data were analyzed from June 9, 2019, to May 13, 2021. INTERVENTIONS Daily oral placebo (n = 5), 300 mg of FRM-0334 (n = 11), or 500 mg of FRM-0334 (n = 11) was administered for 28 days. MAIN OUTCOMES AND MEASURES Primary outcomes were safety and tolerability of FRM-0334 and its peripheral pharmacodynamic effect on plasma progranulin. Secondary outcomes were the plasma pharmacokinetic profile of FRM-0334 and its pharmacodynamic effect on cerebrospinal fluid progranulin. Exploratory outcomes were FDG-PET, FTD clinical severity, and cerebrospinal fluid biomarkers (neurofilament light chain [NfL], amyloid β 1-42, phosphorylated tau 181, and total tau [t-tau]). RESULTS A total of 27 participants (mean [SD] age, 56.6 [10.5] years; 16 women [59.3%]; 26 White participants [96.3%]) with GRN variations were randomized and completed treatment. FRM-0334 was safe and well tolerated but did not affect plasma progranulin (4.3 pg/mL per day change after treatment; 95% CI, -10.1 to 18.8 pg/mL; P = .56), cerebrospinal fluid progranulin (0.42 pg/mL per day; 95% CI, -0.12 to 0.95 pg/mL; P = .13), or exploratory pharmacodynamic measures. Plasma FRM-0334 exposure did not increase proportionally with dose. Brain FDG-PET data were available in 26 of 27 randomized participants. In a cross-sectional analysis of 26 individuals, bifrontal cortical FDG hypometabolism was associated with worse Clinical Dementia Rating (CDR) plus National Alzheimer's Coordinating Center frontotemporal lobar degeneration sum of boxes score (b = -3.6 × 10-2 standardized uptake value ratio [SUVR] units/CDR units; 95% CI, -4.9 × 10-2 to -2.2 × 10-2; P < .001), high cerebrospinal fluid NfL (b = -9.2 × 10-5 SUVR units/pg NfL/mL; 95% CI, -1.3 × 10-4 to -5.6 × 10-5; P < .001), and high CSF t-tau (-7.2 × 10-4 SUVR units/pg t-tau/mL; 95% CI, -1.4 × 10-3 to -9.5 × 10-5; P = .03). CONCLUSIONS AND RELEVANCE In this randomized clinical trial, the current formulation of FRM-0334 did not elevate PRGN levels, which could reflect a lack of efficacy at attained exposures, low bioavailability, or some combination of the 2 factors. Bifrontal FDG-PET is a sensitive measure of symptomatic GRN haploinsufficiency. International multicenter clinical trials of FTD-GRN are feasible. TRIAL REGISTRATION ClinicalTrials.gov Identifier: NCT02149160.
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Affiliation(s)
- Peter A. Ljubenkov
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Lauren Edwards
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Leonardo Iaccarino
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Renaud La Joie
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Julio C. Rojas
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Mary Koestler
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
| | - Baruch Harris
- ROME Therapeutics, Cambridge, Massachusetts
- Metera Pharmaceuticals, Cambridge, Massachusetts
| | | | - Barbara Borroni
- Neurology Unit, Centre for Neurodegenerative Disorders, ASST Spedali Civili Brescia, Italy
- Department of Clinical and Experimental Sciences, University of Brescia, Italy
| | - John C. van Swieten
- Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Murray Grossman
- Perelman School of Medicine, University of Pennsylvania, Philadelphia
| | - Florence Pasquier
- Lille University, Inserm 1172, CHU Lille, CNR-MAJ, DISTALZ, LiCEND, Lille, France
| | - Giovanni B. Frisoni
- Lab of Alzheimer's Neuroimaging and Epidemiology, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Catherine J. Mummery
- Dementia Research Centre, Institute of Neurology, University College London, London, United Kingdom
| | - Rik Vandenberghe
- Neurology Service University Hospitals Leuven, Leuven, Belgium
- Laboratory for Cognitive Neurology, Department of Neurosciences, Leuven Brain Institute, Leuven, Belgium
| | - Isabelle Le Ber
- Paris Brain Institute, Sorbonne University, Paris, France
- Neurology Department, Reference Centre for Rare or Early Dementias, Paris, France
| | - Didier Hannequin
- CHU Rouen Normandie, Service de Neurologie, Rouen University Hospital, Rouen, France
| | - Scott M. McGinnis
- Department of Neurology, Massachusetts General Hospital, Charlestown
| | - Sophie Auriacombe
- Neurology Department, CHU Bordeaux, Bordeaux Hospital, Bordeaux, France
| | - Marco Onofrj
- Department of Neuroscience Imaging, University G d'Annunzio of Chieti-Pescara, Chieti, Italy
| | | | | | | | - Jacob Hesterman
- Institute for Neurodegenerative Disorders, New Haven, Connecticut
| | - Ken Marek
- Invicro, A Konica Minolta Company, Boston, Massachusetts
- Institute for Neurodegenerative Disorders, New Haven, Connecticut
| | - Beth Ann Haynes
- FORUM Pharmaceuticals Incorporated, Waltham, Massachusetts
- Alector, South San Francisco, California
| | | | - Gerhard Koenig
- FORUM Pharmaceuticals Incorporated, Waltham, Massachusetts
- Arkuda Therapeutics, Watertown, Massachusetts
| | - Dana Hilt
- Arkuda Therapeutics, Watertown, Massachusetts
- Lysosomal Therapeutics, Cambridge, Massachusetts
- Frequency Therapeutics, Farmington, Connecticut
| | - Hans Moebius
- FORUM Pharmaceuticals Incorporated, Waltham, Massachusetts
- Athira Pharma Inc, Seattle, Washington
| | - Adam L. Boxer
- Memory and Aging Center, Department of Neurology, University of California at San Francisco, Weill Institute for Neurosciences, San Francisco
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7
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Lanter JC, Chen AYP, Williamson T, Koenig G, Blain JF, Burnett DA. Discovery of quinuclidine modulators of cellular progranulin. Bioorg Med Chem Lett 2021; 47:128209. [PMID: 34153473 DOI: 10.1016/j.bmcl.2021.128209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 04/01/2021] [Revised: 06/10/2021] [Accepted: 06/14/2021] [Indexed: 11/16/2022]
Abstract
Phenotypic screening of an annotated small molecule library identified the quinuclidine tetrahydroisoquinoline solifenacin (1) as a robust enhancer of progranulin secretion with single digit micromolar potency in a murine microglial (BV-2) cell line. Subsequent SAR development led to the identification of 29 with a 38-fold decrease in muscarinic receptor antagonist activity and a 10-fold improvement in BV-2 potency.
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Affiliation(s)
- James C Lanter
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Angela Y-P Chen
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Toni Williamson
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Gerhard Koenig
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Jean-François Blain
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
| | - Duane A Burnett
- Arkuda Therapeutics, 200 Arsenal Yards Blvd Suite 220, Watertown, MA 02472, USA
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8
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Boxer AL, Moebius H, Harris B, Boeve BF, Borroni B, van Swieten JC, Grossman M, Pasquier F, Frisoni GB, Mummery CJ, Vandenberghe R, Le Ber I, Hannequin D, McGinnis SM, Auriacombe S, Onofrj M, Goodman IJ, Riordan HJ, Wisniewski G, Hesterman J, Marek K, Patzke H, Koenig G, Hilt D. O4-02-01: PHASE 2A RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED TRIAL OF THE HISTONE DEACETYLASE INHIBITOR (HDACI), FRM-0334, IN ASYMPTOMATIC CARRIERS OF, OR PATIENTS WITH FRONTOTEMPORAL LOBAR DEGENERATION (FTLD) DUE TO, PROGRANULIN GENE MUTATIONS. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.4746] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam L. Boxer
- University of California, San Francisco; San Francisco CA USA
| | | | | | | | | | - John C. van Swieten
- Department of Neurology; Erasmus University Medical Center; Rotterdam Netherlands
| | - Murray Grossman
- Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
| | | | | | | | | | | | | | | | | | - Marco Onofrj
- Department of Neuroscience Imaging; University G d'Annunzio of Chieti-Pescara; Chieti Italy
| | | | | | | | | | | | | | | | - Dana Hilt
- Lysosomal Therapeutics; Cambridge MA USA
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9
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Lutzweiler G, Barthes J, Koenig G, Kerdjoudj H, Mayingi J, Boulmedais F, Schaaf P, Drenckhan W, Vrana NE. Modulation of Cellular Colonization of Porous Polyurethane Scaffolds via the Control of Pore Interconnection Size and Nanoscale Surface Modifications. ACS Appl Mater Interfaces 2019; 11:19819-19829. [PMID: 31074959 DOI: 10.1021/acsami.9b04625] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Full-scale cell penetration within porous scaffolds is required to obtain functional connective tissue components in tissue engineering applications. For this aim, we produced porous polyurethane structures with well-controlled pore and interconnection sizes. Although the influence of the pore size on cellular behavior is widely studied, we focused on the impact of the size of the interconnections on the colonization by NIH 3T3 fibroblasts and Wharton's jelly-derived mesenchymal stem cells (WJMSCs). To render the material hydrophilic and allow good material wettability, we treated the material either by plasma or by polydopamine (PDA) coating. We show that cells weakly adhere on these surfaces. Keeping the average pore diameter constant at 133 μm, we compare two structures, one with LARGE (52 μm) and one with SMALL (27 μm) interconnection diameters. DNA quantification and extracellular matrix (ECM) production reveal that larger interconnections is more suitable for cells to move across the scaffold and form a three-dimensional cellular network. We argue that LARGE interconnections favor cell communication between different pores, which then favors the production of the ECM. Moreover, PDA treatment shows a truly beneficial effect on fibroblast viability and on matrix production, whereas plasma treatment shows the same effect for WJMSCs. We, therefore, claim that both pore interconnection size and surface treatment play a significant role to improve the quality of integration of tissue engineering scaffolds.
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Affiliation(s)
- G Lutzweiler
- Institut National de la Santé et de la Recherche Medicale, UMR_S 1121 , 11 rue Humann , 67085 Strasbourg Cedex , France
- Faculté de Chirurgie Dentaire , Université de Strasbourg , 8 rue Sainte Elisabeth , 67000 Strasbourg , France
- Université de Strasbourg, CNRS, Institut Charles Sadron , 23 rue de Loess , 67034 Strasbourg , France
| | - J Barthes
- Protip Medical SAS , 8 Place de l'Hôpital , 67000 Strasbourg , France
| | - G Koenig
- Institut National de la Santé et de la Recherche Medicale, UMR_S 1121 , 11 rue Humann , 67085 Strasbourg Cedex , France
- Faculté de Chirurgie Dentaire , Université de Strasbourg , 8 rue Sainte Elisabeth , 67000 Strasbourg , France
| | - H Kerdjoudj
- EA 4691, Biomateŕiaux et Inflammation en Site Osseux (BIOS), SFR-CAP Santé (FED4231), Université de Reims Champagne Ardenne , 51100 Reims , France
- UFR d'Odontologie, Université de Reims Champagne Ardenne , 51100 Reims , France
| | - J Mayingi
- Cetim Grand Est , 24a Rue d'Alsace , 67400 Illkirch-Graffenstaden , France
| | - F Boulmedais
- Université de Strasbourg, CNRS, Institut Charles Sadron , 23 rue de Loess , 67034 Strasbourg , France
| | - P Schaaf
- Institut National de la Santé et de la Recherche Medicale, UMR_S 1121 , 11 rue Humann , 67085 Strasbourg Cedex , France
- Faculté de Chirurgie Dentaire , Université de Strasbourg , 8 rue Sainte Elisabeth , 67000 Strasbourg , France
| | - W Drenckhan
- Université de Strasbourg, CNRS, Institut Charles Sadron , 23 rue de Loess , 67034 Strasbourg , France
| | - N E Vrana
- Protip Medical SAS , 8 Place de l'Hôpital , 67000 Strasbourg , France
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10
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Blume T, Filser S, Jaworska A, Blain JF, Koenig G, Moschke K, Lichtenthaler SF, Herms J. BACE1 Inhibitor MK-8931 Alters Formation but Not Stability of Dendritic Spines. Front Aging Neurosci 2018; 10:229. [PMID: 30093858 PMCID: PMC6070607 DOI: 10.3389/fnagi.2018.00229] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 01/09/2018] [Accepted: 07/11/2018] [Indexed: 11/23/2022] Open
Abstract
Beta-site amyloid-precursor-protein cleaving enzyme 1 (BACE1) is the rate limiting protease in the production of the amyloid-beta peptide (Aβ), which is considered to be the causative agent in the pathogenesis of Alzheimer’s Disease (AD). Therefore, the therapeutic potential of pharmacological BACE1 inhibitors is currently tested in clinical trials for AD treatment. To ensure a positive clinical outcome it is crucial to identify and evaluate adverse effects associated with BACE1 inhibition. Preclinical studies show that chronic blockade of BACE1 activity alters synaptic functions and leads to loss of dendritic spines. To assess the mechanism of synapse loss, dendritic spine dynamics of pyramidal layer V cells were monitored by in vivo two-photon microscopy in the somatosensory cortex of mice, treated with the BACE1 inhibitor MK-8931. MK-8931 treatment significantly reduced levels of Aβ40 and density of dendritic spines in the brain. However, the steady decline in dendritic spine density specifically resulted from a diminished formation of new spines and not from a loss of stable spines. Furthermore, the described effects on spine formation were transient and recovered after inhibitor withdrawal. Since MK-8931 inhibition did not completely abolish spine formation, our findings suggest that carefully dosed inhibitors might be therapeutically effective without affecting the structural integrity of excitatory synapses if given at an early disease stage.
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Affiliation(s)
- Tanja Blume
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany
| | - Severin Filser
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany
| | - Anna Jaworska
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany
| | | | | | - Katrin Moschke
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany.,Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany
| | - Stefan F Lichtenthaler
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany.,Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany.,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Jochen Herms
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Helmholtz-Gemeinschaft Deutscher Forschungszentren (HZ)-German Center for Neurodegenerative Diseases, Munich, Germany.,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany.,Zentrum für Neuropathologie und Prionforschung, Munich, Germany
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11
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Bursavich MG, Harrison BA, Acharya R, Costa DE, Freeman EA, Hodgdon HE, Hrdlicka LA, Jin H, Kapadnis S, Moffit JS, Murphy DA, Nolan S, Patzke H, Tang C, Wen M, Koenig G, Blain JF, Burnett DA. Design, Synthesis, and Evaluation of a Novel Series of Oxadiazine Gamma Secretase Modulators for Familial Alzheimer’s Disease. J Med Chem 2017; 60:2383-2400. [DOI: 10.1021/acs.jmedchem.6b01620] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Matthew G. Bursavich
- FORUM Pharmaceuticals, 225 Second Avenue, Waltham, Massachusetts 02451, United States
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12
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Levin JM, Holtzman SH, Maraganore J, Hastings PJ, Cohen R, Dahiyat B, Adams J, Adams C, Ahrens B, Albers J, Aspinall MG, Audia JE, Babler M, Barrett P, Barry Z, Bermingham N, Bloch S, Blum RI, Bolno PB, Bonney MW, Booth B, Bradbury DM, Brauer SK, Byers B, Cagnoni PJ, Cali BM, Ciechanover I, Clark C, Clayman MD, Cleland JL, Cobb P, Cooper R, Currie MG, Diekman J, Dobmeier EL, Doerfler D, Donley EL, Dunsire D, During M, Eckstein JW, Elenko E, Exter NA, Fleming JJ, Flesher GJ, Formela JF, Forrester R, Francois C, Franklin H, Freeman MW, Furst H, Gage LP, Galakatos N, Gallagher BM, Geraghty JA, Gill S, Goeddel DV, Goldsmith MA, Gowen M, Goyal V, Graney T, Grayzel D, Greene B, Grint P, Gutierrez-Ramos JC, Haney B, Ha-Ngoc T, Harris T, Hasnain F, Hata YS, Hecht P, Henshaw L, Heyman R, Hoppenot H, Horvitz HR, Hughes TE, Hutton WS, Isaacs ST, Jenkins A, Jonker J, Kaplan J, Karsen P, Keiper J, Kim J, Kindler J, King R, King V, Kjellson N, Koenig S, Koenig G, Kolchinsky P, Laikind P, Langer RB, Lee JJ, Leff JS, Leicher BA, Leschly N, Levin A, Levin M, Levine AJ, Levy A, Liu DR, Lodish HF, Lopatin U, Love TW, Macdonald G, Maderis GJ, Mahadevia A, Mahanthappa NK, Martin JF, Martin A, Martucci WE, McArthur JG, McCann CM, McCarthy SA, McDonough CG, Mendlein J, Miller L, Miralles D, Moch KI, More B, Myers AG, Narachi MA, Nashat A, Nelson W, Newell WJ, Olle B, Osborn JE, Owens JC, Pande A, Papadopoulos S, Parker HS, Parmar KM, Patterson MR, Paul SM, Perez R, Perry M, Pfeffer CG, Powell M, Pruzanski M, Purcell DJ, Rakhit A, Ramamoorthi K, Rastetter W, Rawcliffe AA, Reid LE, Renaud RC, Rhodes JP, Rieflin WJ, Robins C, Rocklage SM, Rosenblatt M, Rosin JG, Rutter WJ, Saha S, Samuels C, Sato VL, Scangos G, Scarlett JA, Schenkein D, Schreiber SL, Schwab A, Sekhri P, Shah R, Shenk T, Siegall CB, Simon NJ, Simonian N, Stein J, Su M, Szela MT, Taglietti M, Tandon N, Termeer H, Thornberry NA, Tolar M, Ulevitch R, Vaishnaw AK, VanLent A, Varsavsky M, Vlasuk GP, Vounatsos M, Waksal SG, Warma N, Watts RJ, Werber Y, Westphal C, Wierenga W, Williams DE, Williams LR, Xanthopoulos KG, Zohar D, Zweifach SS. US immigration order strikes against biotech. Nat Biotechnol 2017; 35:204-206. [PMID: 28267733 DOI: 10.1038/nbt.3824] [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: 11/09/2022]
Affiliation(s)
| | | | | | | | - Ron Cohen
- Acorda Therapeutics, Inc., Ardsley, New York, USA
| | | | - Julian Adams
- Clal Biotechnology Industries (CBI), Cambridge, Massachusetts, USA
| | - Chris Adams
- Cydan Development Inc., Cambridge, Massachusetts, USA
| | | | - Jeff Albers
- Blueprint Medicines, Cambridge, Massachusetts, USA
| | | | - James E Audia
- Constellation Pharmaceuticals, Inc., Cambridge, Massachusetts, USA
| | - Martin Babler
- Principia Biopharma, South San Francisco, California, USA
| | | | | | | | | | - Robert I Blum
- Cytokinetics, Inc., South San Francisco, California, USA
| | - Paul B Bolno
- Wave Life Sciences, Cambridge, Massachusetts, USA
| | | | - Bruce Booth
- Atlas Venture, Cambridge, Massachusetts, USA
| | | | | | - Brook Byers
- Biotech Venture Capitalist since 1978, Menlo Park, California, USA
| | - Pablo J Cagnoni
- Tizona Therapeutics, Inc., South San Francisco, California, USA
| | - Brian M Cali
- Ironwood Pharmaceuticals, Cambridge, Massachusetts, USA
| | | | - Chip Clark
- Genocea Biosciences, Inc., Cambridge, Massachusetts, USA
| | | | | | - Paula Cobb
- Decibel Therapeutics, Cambridge, Massachusetts, USA
| | - Ron Cooper
- Albireo Pharma Inc., Boston, Massachusetts, USA
| | - Mark G Currie
- Ironwood Pharmaceuticals, Cambridge, Massachusetts, USA
| | | | | | | | | | - Deborah Dunsire
- Southern Cross Biotech Consulting, Waltham, Massachusetts, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Simba Gill
- Evelo Biosciences, Cambridge, Massachusetts, USA
| | | | | | - Maxine Gowen
- Trevena Inc., King of Prussia, Pennsylvania, USA
| | | | - Tom Graney
- Ironwood Pharmaceuticals, Cambridge, Massachusetts, USA
| | | | - Barry Greene
- Alnylam Pharmaceuticals, Cambridge, Massachusetts, USA
| | - Paul Grint
- Regulus Therapeutics, San Diego, California, USA
| | | | - Bill Haney
- Dragonfly Therapeutics, Inc., Cambridge, Massachusetts, USA
| | | | - Tim Harris
- SV Life Sciences, Boston, Massachusetts, USA
| | | | | | - Peter Hecht
- Ironwood Pharmaceuticals, Cambridge, Massachusetts, USA
| | | | | | | | - H Robert Horvitz
- Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | | | | | | | | | - Jeff Jonker
- NGM Biopharmaceuticals, Inc., South San Francisco, California, USA
| | - Jeff Kaplan
- Deerfield Management, New York, New York, USA
| | - Perry Karsen
- Intellia Therapeutics, Cambridge, Massachusetts, USA
| | - Jeb Keiper
- Nimbus Therapeutics, Cambridge, Massachusetts, USA
| | - Jean Kim
- Deerfield Management, New York, New York, USA
| | - Jeff Kindler
- Centrexion Therapeutics Inc., Boston, Massachusetts, USA
| | - Rachel King
- GlycoMimetics, Inc., Rockville, Maryland, USA
| | - Vanessa King
- Luc Therapeutics, Inc., Cambridge, Massachusetts, USA
| | | | | | | | | | | | - Robert Bob Langer
- Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - John J Lee
- Decibel Therapeutics, Cambridge, Massachusetts, USA
| | | | - Bruce A Leicher
- Momenta Pharmaceuticals, Inc., Cambridge, Massachusetts, USA
| | | | - Andrew Levin
- RA Capital Management, LLC, Boston, Massachusetts, USA
| | - Mark Levin
- Third Rock Ventures, Boston, Massachusetts, USA
| | | | - Alan Levy
- Chrono Therapeutics, Hayward, California, USA
| | - David R Liu
- Editas Medicine, Cambridge, Massachusetts, USA
| | | | | | - Ted W Love
- Global Blood Therapeutics, South San Francisco, California, USA
| | | | - Gail J Maderis
- Antiva Biosciences, Inc., South San Francisco, California, USA
| | | | | | - Joel F Martin
- Dauntless Pharmaceuticals, Inc., San Diego, California, USA
| | - Alex Martin
- Realm Therapeutics, Malvern, Pennsylvania, USA
| | | | | | | | | | | | | | - Larry Miller
- Macrolide Pharmaceuticals, Watertown, Massachusetts, USA
| | | | - Kenneth I Moch
- Cognition Therapeutics, Inc., Pittsburgh, Pennsylvania, USA
| | - Bob More
- Alta Partners, San Francisco, California, USA
| | | | | | - Amir Nashat
- Polaris Partners, Boston, Massachusetts, USA
| | - Wendy Nelson
- Boston Biotech Forum, Cambridge, Massachusetts, USA
| | | | - Bernat Olle
- Vedanta Biosciences, Inc., Cambridge, Massachusetts, USA
| | | | - Julia C Owens
- Millendo Therapeutics, Inc., Ann Arbor, Michigan, USA
| | - Atul Pande
- Verity BioConsulting, San Diego, California, USA
| | - Stelios Papadopoulos
- Biogen Inc., Exelixis Inc. &Regulus Therapeutics Inc., Great Neck, New York, USA
| | | | | | | | - Steve M Paul
- Voyager Therapeutics, Inc., Cambridge, Massachusetts, USA
| | - Rob Perez
- Life Science Cares, Boston, Massachusetts, USA
| | | | | | - Mike Powell
- Sofinnova Ventures, Menlo Park, California, USA
| | | | | | | | | | | | | | | | - Ron C Renaud
- RaNa Therapeutics, Cambridge, Massachusetts, USA
| | | | | | - Chad Robins
- Adaptive Biotechnologies, Seattle, Washington, USA
| | | | | | | | | | | | | | - Vicki L Sato
- Harvard Business School, Cambridge, Massachusetts, USA
| | | | | | | | | | | | | | - Rajeev Shah
- RA Capital Management, LLC, Boston, Massachusetts, USA
| | - Thomas Shenk
- Lewis Thomas Laboratory, Princeton, New Jersey, USA
| | | | - Nick J Simon
- Clarus Ventures LLC, South San Francisco, California, USA
| | | | - Jeff Stein
- Cidara Therapeutics, San Diego, California, USA
| | - Michael Su
- Decibel Therapeutics, Cambridge, Massachusetts, USA
| | - Mary T Szela
- Novelion Therapeutics, Vancouver, British Columbia, USA
| | | | | | - Henri Termeer
- Genzyme Corporation (former CEO), Cambridge, Massachusetts, USA
| | | | | | | | | | | | | | - George P Vlasuk
- Navitor Pharmaceuticals, Inc., Cambridge, Massachusetts, USA
| | | | | | - Neil Warma
- Opexa Therapeutics, Inc., The Woodlands, Texas, USA
| | - Ryan J Watts
- Denali Therapeutics Inc., South San Francisco, California, USA
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13
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Carradò A, Perrin-Schmitt F, Le Q, Giraudel M, Fischer C, Koenig G, Jacomine L, Behr L, Chalom A, Fiette L, Morlet A, Pourroy G. Nanoporous hydroxyapatite/sodium titanate bilayer on titanium implants for improved osteointegration. Dent Mater 2017; 33:321-332. [DOI: 10.1016/j.dental.2016.12.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 12/27/2016] [Accepted: 12/28/2016] [Indexed: 12/21/2022]
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14
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Townsend M, Whyment A, Walczak JS, Jeggo R, van den Top M, Flood DG, Leventhal L, Patzke H, Koenig G. α7-nAChR agonist enhances neural plasticity in the hippocampus via a GABAergic circuit. J Neurophysiol 2016; 116:2663-2675. [PMID: 27655963 DOI: 10.1152/jn.00243.2016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [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: 03/21/2016] [Accepted: 09/18/2016] [Indexed: 11/22/2022] Open
Abstract
Agonists of the α7-nicotinic acetylcholine receptor (α7-nAChR) have entered clinical trials as procognitive agents for treating schizophrenia and Alzheimer's disease. The most advanced compounds are orthosteric agonists, which occupy the ligand binding site. At the molecular level, agonist activation of α7-nAChR is reasonably well understood. However, the consequences of activating α7-nAChRs on neural circuits underlying cognition remain elusive. Here we report that an α7-nAChR agonist (FRM-17848) enhances long-term potentiation (LTP) in rat septo-hippocampal slices far below the cellular EC50 but at a concentration that coincides with multiple functional outcome measures as we reported in Stoiljkovic M, Leventhal L, Chen A, Chen T, Driscoll R, Flood D, Hodgdon H, Hurst R, Nagy D, Piser T, Tang C, Townsend M, Tu Z, Bertrand D, Koenig G, Hajós M. Biochem Pharmacol 97: 576-589, 2015. In this same concentration range, we observed a significant increase in spontaneous γ-aminobutyric acid (GABA) inhibitory postsynaptic currents and a moderate suppression of excitability in whole cell recordings from rat CA1 pyramidal neurons. This modulation of GABAergic activity is necessary for the LTP-enhancing effects of FRM-17848, since inhibiting GABAA α5-subunit-containing receptors fully reversed the effects of the α7-nAChR agonist. These data suggest that α7-nAChR agonists may increase synaptic plasticity in hippocampal slices, at least in part, through a circuit-level enhancement of a specific subtype of GABAergic receptor.
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Affiliation(s)
| | | | | | - Ross Jeggo
- Cerebrasol, Ltd., Montreal, Quebec City, Canada
| | | | | | - Liza Leventhal
- FORUM Pharmaceuticals, Inc., Waltham, Massachusetts; and
| | - Holger Patzke
- FORUM Pharmaceuticals, Inc., Waltham, Massachusetts; and
| | - Gerhard Koenig
- FORUM Pharmaceuticals, Inc., Waltham, Massachusetts; and
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15
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Blain JF, Bursavich MG, Freeman EA, Hrdlicka LA, Hodgdon HE, Chen T, Costa DE, Harrison BA, Kapadnis S, Murphy DA, Nolan S, Tu Z, Tang C, Burnett DA, Patzke H, Koenig G. Characterization of FRM-36143 as a new γ-secretase modulator for the potential treatment of familial Alzheimer's disease. Alzheimers Res Ther 2016; 8:34. [PMID: 27572246 PMCID: PMC5004293 DOI: 10.1186/s13195-016-0199-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 07/18/2016] [Indexed: 01/01/2023]
Abstract
Background Familial Alzheimer’s disease (FAD) is caused by mutations in the amyloid precursor protein (APP) or presenilin (PS). Most PS mutations, which account for the majority of FAD cases, lead to an increased ratio of longer to shorter forms of the amyloid beta (Aβ) peptide. The therapeutic rationale of γ-secretase modulators (GSMs) for Alzheimer’s disease is based on this genetic evidence as well as on enzyme kinetics measurements showing changes in the processivity of the γ-secretase complex. This analysis suggests that GSMs could potentially offset some of the effects of PS mutations on APP processing, thereby addressing the root cause of early onset FAD. Unfortunately, the field has generated few, if any, molecules with good central nervous system (CNS) drug-like properties to enable proof-of-mechanism studies. Method We characterized the novel GSM FRM-36143 using multiple cellular assays to determine its in vitro potency and off-target activity as well as its potential to reverse the effect of PS mutations. We also tested its efficacy in vivo in wild-type mice and rats. Results FRM-36143 has much improved CNS drug-like properties compared to published GSMs. It has an in vitro EC50 for Aβ42 of 35 nM in H4 cells, can reduce Aβ42 to 58 % of the baseline in rat cerebrospinal fluid, and also increases the non-amyloidogenic peptides Aβ37 and Aβ38. It does not inhibit Notch processing, nor does it inhibit 24-dehydrocholesterol reductase (DHCR24) activity. Most interestingly, it can reverse the effects of presenilin mutations on APP processing in vitro. Conclusions FRM-36143 possesses all the characteristics of a GSM in terms of Aβ modulation Because FRM-36143 was able to reverse the effect of PS mutations, we suggest that targeting patients with this genetic defect would be the best approach at testing the efficacy of a GSM in the clinic. While the amyloid hypothesis is still being tested with β-site APP-cleaving enzyme inhibitors and monoclonal antibodies in sporadic AD, we believe it is not a hypothesis for FAD. Since GSMs can correct the molecular defect caused by PS mutations, they have the promise to provide benefits to the patients when treated early enough in the course of the disease.
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Affiliation(s)
| | | | - Emily A Freeman
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Lori A Hrdlicka
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | | | - Ting Chen
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Don E Costa
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Bryce A Harrison
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | | | - Deirdre A Murphy
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Scott Nolan
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Zhiming Tu
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Cuyue Tang
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Duane A Burnett
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Holger Patzke
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
| | - Gerhard Koenig
- FORUM Pharmaceuticals Inc, 225 2nd Avenue, Waltham, MA, 02451, USA
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Masilamoni GJ, Uthayathas S, Koenig G, Leventhal L, Papa SM. Effects of a novel phosphodiesterase 10A inhibitor in non-human primates: A therapeutic approach for schizophrenia with improved side effect profile. Neuropharmacology 2016; 110:449-457. [PMID: 27539962 DOI: 10.1016/j.neuropharm.2016.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/09/2016] [Accepted: 08/13/2016] [Indexed: 12/31/2022]
Abstract
Schizophrenia symptoms are associated with alterations in basal ganglia-cortical networks that include the cyclic nucleotides (cAMP/cGMP) signaling pathways. Phosphodiesterase 10A (PDE10A) inhibitors have been considered as therapeutic agents for schizophrenia because the regulation of cAMP and cGMP in the striatum by PDE10A plays an important role in the signaling mechanisms of the striatal-cortical network, and thereby in cognitive function. In the present study we assessed in non-human primates (NHPs) the effects of a novel PDE10A inhibitor (FRM-6308) that has demonstrated high potency and selectivity for human recombinant PDE10A in vitro. The behavioral effects of FRM-6308 in a dose range were determined in rhesus monkeys using a standardized motor disability scale for primates, motor tasks, and the "drug effects on the nervous system" (DENS) scale. The neuronal metabolic effects of FRM-6308 were determined with [(18)F]-fluorodeoxyglucose PET imaging. Results showed that FRM-6308 did not have any specific effects on the motor system at s.c. doses up to 0.32 mg/kg in NHPs, which induced a significant increase in the FDG-SUV in striatum (F 16.069, p < 0.05) and cortical (F 15.181, p < 0.05) regions. Higher doses induced sedation and occasional involuntary movements with clear development of tolerance after repeated exposures. These findings suggest that FRM-6308 has the adequate pharmacological profile to advance testing in clinical trials and demonstrate antipsychotic efficacy of PDE10A inhibition for the treatment of schizophrenia patients.
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Affiliation(s)
- Gunasingh J Masilamoni
- Yerkes National Primate Research Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Subramanian Uthayathas
- Yerkes National Primate Research Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Gerhard Koenig
- Research, FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA, USA
| | - Liza Leventhal
- Research, FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA, USA
| | - Stella M Papa
- Yerkes National Primate Research Center, Emory University School of Medicine, Atlanta, GA, USA; Department of Neurology, Emory University School of Medicine, Atlanta, GA, USA.
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Jin H, Kapadnis S, Chen T, Lee D, McRiner A, Cook A, Burnett DA, Koenig G, Tang C. Intracellular Retention of Three Quinuclidine Derivatives in Caco-2 Permeation Experiments: Mechanisms and Impact on Estimating Permeability and Active Efflux Ratio. Drug Metab Lett 2016; 10:161-171. [PMID: 27456669 DOI: 10.2174/1872312810666160725123322] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Three quinuclidine derivatives (FRM-1, FRM-2 and FRM-3) were subject to significant mass loss to cellular retention in Caco-2 permeation experiments. The apparent permeability coefficient (Papp) calculated with either 'sink' (Papp,sink) or 'non-sink' (Papp,nonsink) method was significantly biased. As a result, a simplified 3-compartmental distribution model was applied in this study to derive the 'intrinsic' Papp (Papp,int) and to understand the impact of cellular retention on estimating Papp and active efflux ratio (ER) values. METHODS Time-courses of the amount of test compounds in the donor, receiver and cells were determined in the presence and absence of bafilomycin A1 (BFA, 100 nM) and / or cyclosporine A (CsA, 10 .M). A mathematical model was constructed to describe the mass transfer of test compounds among three compartments. The temporal profiles of directional Papp,sink, Papp,nonsink and the corresponding of ER values were compared with the counterpart parameters derived from data-fitting to the mathematical model. Simulations were performed for a better understanding of experimental observations. RESULTS The mass recovery of test compounds deteriorated with incubation time and was direction dependent. Based on the directional Papp,sink values, the resulting ER is close to unity for FRM-1, and approximately 2 and 3.5 for FRM-2 and FRM-3. Treatment with BFA considerably enhanced mass recovery for FRM-1 and FRM-3 (by 5- and 2-fold) but elicited no impact on FRM-2, while ER values largely unchanged. Expectedly, Papp,nonsink was higher than Papp,sink, but the resulting ER was lower in most cases. In contrast, the model-derived Papp,int was much greater than the values of Papp,sink and Papp,nonsink. The model also quantitatively unveiled the respective contributions of lysosomal sequestration and nonspecific binding to the cellular retention of the compounds. CONCLUSION Our work reveals the different mechanisms involved in cellular retention of these quinuclidine derivatives, and more importantly, demonstrates the value of kinetic analyses with mathematical modeling in minimizing the bias in Papp estimation when assumptions for conventional calculations are violated.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Cuyue Tang
- FORUM Pharmaceuticals, 225 2nd Ave, Waltham, MA 02451, USA
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18
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Keefe RSE, Meltzer HA, Dgetluck N, Gawryl M, Koenig G, Moebius HJ, Lombardo I, Hilt DC. Randomized, Double-Blind, Placebo-Controlled Study of Encenicline, an α7 Nicotinic Acetylcholine Receptor Agonist, as a Treatment for Cognitive Impairment in Schizophrenia. Neuropsychopharmacology 2015; 40:3053-60. [PMID: 26089183 PMCID: PMC4864641 DOI: 10.1038/npp.2015.176] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 04/14/2015] [Accepted: 06/03/2015] [Indexed: 01/03/2023]
Abstract
Encenicline is a novel, selective α7 nicotinic acetylcholine receptor agonist in development for treating cognitive impairment in schizophrenia and Alzheimer's disease. A phase 2, double-blind, randomized, placebo-controlled, parallel-design, multinational study was conducted. Patients with schizophrenia on chronic stable atypical antipsychotics were randomized to encenicline 0.27 or 0.9 mg once daily or placebo for 12 weeks. The primary efficacy end point was the Overall Cognition Index (OCI) score from the CogState computerized battery. Secondary end points include MATRICS Consensus Cognitive Battery (MCCB) (in US patients), the Schizophrenia Cognition Rating Scale (SCoRS) total score, SCoRS global rating, and Positive and Negative Syndrome Scale (PANSS) total and subscale and cognition factor scores. Of 319 randomized patients, 317 were included in the safety population, and 307 were included in the intent-to-treat population. Notable trends in improvement were demonstrated across all cognition scales. For the OCI score, the LS mean difference for encenicline 0.27 mg vs placebo was significant (Cohen's d=0.257; P=0.034). Mean SCoRS total scores decreased showing improvement in function over time, and the difference was significant for encenicline 0.9 mg vs placebo (P=0.011). Furthermore, the difference between encenicline 0.9 mg and placebo was significant for the PANSS Cognition Impairment Domain (P=0.0098, Cohen's d=0.40) and for the PANSS Negative scale (P=0.028, Cohen's d=0.33). Treatment-emergent adverse events were reported at similar frequencies across all treatment groups (39.0% with placebo, 23.4% with encenicline 0.27 mg, and 33.3% with encenicline 0.9 mg). Overall, encenicline was generally well tolerated and demonstrated clinically meaningful improvements in cognition and function in patients with schizophrenia.
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Affiliation(s)
- Richard SE Keefe
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Herbert A Meltzer
- Department of Psychiatry and Behavioral Sciences Psychiatry, Northwestern University, Feinberg School of Medicine, USA
| | | | | | | | | | | | - Dana C Hilt
- FORUM Pharmaceuticals Inc., Waltham, MA, USA,FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA, Tel: +1 617 225 4250, Fax: +1 617 225 4267, E-mail:
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Stoiljkovic M, Leventhal L, Chen A, Chen T, Driscoll R, Flood D, Hodgdon H, Hurst R, Nagy D, Piser T, Tang C, Townsend M, Tu Z, Bertrand D, Koenig G, Hajós M. Concentration-response relationship of the α7 nicotinic acetylcholine receptor agonist FRM-17874 across multiple in vitro and in vivo assays. Biochem Pharmacol 2015. [PMID: 26206187 DOI: 10.1016/j.bcp.2015.07.006] [Citation(s) in RCA: 24] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Pharmacological activation of α7 nicotinic acetylcholine receptors (α7 nAChRs) may improve cognition in schizophrenia and Alzheimer's disease. The present studies describe an integrated pharmacological analysis of the effects of FRM-17874, an analogue of encenicline, on α7 nAChRs in vitro and in behavioral and neurophysiological assays relevant to cognitive function. FRM-17874 demonstrated high affinity binding to human α7 nAChRs, displacing [(3)H]-methyllacaconitine (Ki=4.3nM). In Xenopus laevis oocytes expressing human α7 nAChRs, FRM-17874 acted as an agonist, evoking inward currents with an EC50 of 0.42μM. Lower concentrations of FRM-17874 (0.01-3nM) elicited no detectable current, but primed receptors to respond to sub-maximal concentrations of acetylcholine. FRM-17874 improved novel object recognition in rats, and enhanced memory acquisition and reversal learning in the mouse water T-maze. Neurophysiological correlates of cognitive effects of drug treatment, such as synaptic transmission, long-term potentiation, and hippocampal theta oscillation were also evaluated. Modulation of synaptic transmission and plasticity was observed in rat hippocampal slices at concentrations of 3.2 and 5nM. FRM-17874 showed a dose-dependent facilitation of stimulation-induced hippocampal theta oscillation in mice and rats. The FRM-17874 unbound brain concentration-response relationship for increased theta oscillation power was similar in both species, exhibited a biphasic pattern peaking around 3nM, and overlapped with active doses and exposures observed in cognition assays. In summary, behavioral and neurophysiological assays indicate a bell-shaped effective concentration range and this report represents the first attempt to explain the concentration-response function of α7 nAChR-mediated pro-cognitive effects in terms of receptor pharmacology.
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Affiliation(s)
- Milan Stoiljkovic
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, 310 Cedar St., New Haven, CT 06520, USA.
| | - Liza Leventhal
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Angela Chen
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Ting Chen
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Rachelle Driscoll
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Dorothy Flood
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Hilliary Hodgdon
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Raymond Hurst
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - David Nagy
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, 310 Cedar St., New Haven, CT 06520, USA.
| | - Timothy Piser
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Cuyue Tang
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Matthew Townsend
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Zhiming Tu
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Daniel Bertrand
- HiQScreen Sàrl, 6, rte de Compois, 1222 Vésenaz, Geneva, Switzerland.
| | - Gerhard Koenig
- FORUM Pharmaceuticals Inc., 225 Second Avenue, Waltham, MA 02451, USA.
| | - Mihaly Hajós
- Translational Neuropharmacology, Section of Comparative Medicine, Yale University School of Medicine, 310 Cedar St., New Haven, CT 06520, USA.
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Shao Y, Simmonett A, Pickard F, Koenig G, Brooks B. Quantum Mechanical Molecular Mechanical Calculations using AMOEBA Force Fields. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.871] [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: 11/29/2022] Open
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21
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Koenig G. S1‐02‐03: NACHR7 AGONIST FOR ALZHEIMER'S DISEASE. Alzheimers Dement 2014. [DOI: 10.1016/j.jalz.2014.04.041] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Koenig G. Nicotinic agonists for Alzheimer therapy. Neurobiol Aging 2014. [DOI: 10.1016/j.neurobiolaging.2014.01.077] [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: 11/28/2022]
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Rogers K, Felsenstein KM, Hrdlicka L, Tu Z, Albayya F, Lee W, Hopp S, Miller MJ, Spaulding D, Yang Z, Hodgdon H, Nolan S, Wen M, Costa D, Blain JF, Freeman E, De Strooper B, Vulsteke V, Scrocchi L, Zetterberg H, Portelius E, Hutter-Paier B, Havas D, Ahlijanian M, Flood D, Leventhal L, Shapiro G, Patzke H, Chesworth R, Koenig G. Modulation of γ-secretase by EVP-0015962 reduces amyloid deposition and behavioral deficits in Tg2576 mice. Mol Neurodegener 2012; 7:61. [PMID: 23249765 PMCID: PMC3573960 DOI: 10.1186/1750-1326-7-61] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [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: 07/08/2012] [Accepted: 12/14/2012] [Indexed: 12/19/2022] Open
Abstract
Background A hallmark of Alzheimer’s disease is the presence of senile plaques in human brain primarily containing the amyloid peptides Aβ42 and Aβ40. Many drug discovery efforts have focused on decreasing the production of Aβ42 through γ-secretase inhibition. However, identification of γ-secretase inhibitors has also uncovered mechanism-based side effects. One approach to circumvent these side effects has been modulation of γ-secretase to shift Aβ production to favor shorter, less amyloidogenic peptides than Aβ42, without affecting the overall cleavage efficiency of the enzyme. This approach, frequently called γ-secretase modulation, appears more promising and has lead to the development of new therapeutic candidates for disease modification in Alzheimer’s disease. Results Here we describe EVP-0015962, a novel small molecule γ-secretase modulator. EVP-0015962 decreased Aβ42 in H4 cells (IC50 = 67 nM) and increased the shorter Aβ38 by 1.7 fold at the IC50 for lowering of Aβ42. AβTotal, as well as other carboxyl-terminal fragments of amyloid precursor protein, were not changed. EVP-0015962 did not cause the accumulation of other γ-secretase substrates, such as the Notch and ephrin A4 receptors, whereas a γ-secretase inhibitor reduced processing of both. A single oral dose of EVP-0015962 (30 mg/kg) decreased Aβ42 and did not alter AβTotal peptide levels in a dose-dependent manner in Tg2576 mouse brain at an age when overt Aβ deposition was not present. In Tg2576 mice, chronic treatment with EVP-0015962 (20 or 60 mg/kg/day in a food formulation) reduced Aβ aggregates, amyloid plaques, inflammatory markers, and cognitive deficits. Conclusions EVP-0015962 is orally bioavailable, detected in brain, and a potent, selective γ-secretase modulator in vitro and in vivo. Chronic treatment with EVP-0015962 was well tolerated in mice and lowered the production of Aβ42, attenuated memory deficits, and reduced Aβ plaque formation and inflammation in Tg2576 transgenic animals. In summary, these data suggest that γ-secretase modulation with EVP-0015962 represents a viable therapeutic alternative for disease modification in Alzheimer’s disease.
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Affiliation(s)
- Kathryn Rogers
- EnVivo Pharmaceuticals, Inc, 500 Arsenal Street, Watertown, MA 02472, USA
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Hilt D, Gawryl M, Koenig G, Dgetluck N, Moebius H. O4‐12‐04: EVP‐6124, a selective alpha‐7 partial agonist, has positive effects on cognition and clinical function in mild‐to‐moderate Alzheimer's disease patients: Results of a six‐month, double‐blind, placebo controlled, dose ranging study. Alzheimers Dement 2012. [DOI: 10.1016/j.jalz.2013.08.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Dana Hilt
- EnVivo PharmaceuticalsWatertownMassachusettsUnited States
| | - Maria Gawryl
- EnVivo PharmaceuticalsWatertownMassachusettsUnited States
| | - Gerhard Koenig
- EnVivo PharmaceuticalsWatertownMassachusettsUnited States
| | - Nancy Dgetluck
- EnVivo PharmaceuticalsWatertownMassachusettsUnited States
| | - Hans Moebius
- EnVivo PharmaceuticalsWatertownMassachusettsUnited States
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Flood D, Chen A, Driscoll R, Lovric I, Freeman E, Hodgdon H, Yang Z, Spaulding D, Costa D, Koperniak T, Ramirez R, Rogers K, Patzke H, Blain J, Leventhal L, Koenig G. P1‐219: GSM treatment after the onset of Aβ deposition in mice reduces total Aβ load. Alzheimers Dement 2012. [DOI: 10.1016/j.jalz.2012.05.498] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dorothy Flood
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Angela Chen
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | | | - Irena Lovric
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Emily Freeman
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | | | - Zhiyong Yang
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | | | - Don Costa
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Tom Koperniak
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Ricardo Ramirez
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Kathryn Rogers
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Holger Patzke
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | | | - Liza Leventhal
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
| | - Gerhard Koenig
- EnVivo Pharmaceuticals, Inc.WatertownMassachusettsUnited States
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Wu J, Shih HP, Vigont V, Hrdlicka L, Diggins L, Singh C, Mahoney M, Chesworth R, Shapiro G, Zimina O, Chen X, Wu Q, Glushankova L, Ahlijanian M, Koenig G, Mozhayeva GN, Kaznacheyeva E, Bezprozvanny I. Neuronal store-operated calcium entry pathway as a novel therapeutic target for Huntington's disease treatment. ACTA ACUST UNITED AC 2011; 18:777-93. [PMID: 21700213 DOI: 10.1016/j.chembiol.2011.04.012] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 04/05/2011] [Accepted: 04/18/2011] [Indexed: 10/18/2022]
Abstract
Huntington's disease (HD) is a neurodegenerative disorder caused by a polyglutamine expansion within Huntingtin (Htt) protein. In the phenotypic screen we identified a class of quinazoline-derived compounds that delayed a progression of a motor phenotype in transgenic Drosophila HD flies. We found that the store-operated calcium (Ca(2+)) entry (SOC) pathway activity is enhanced in neuronal cells expressing mutant Htt and that the identified compounds inhibit SOC pathway in HD neurons. The same compounds exerted neuroprotective effects in glutamate-toxicity assays with YAC128 medium spiny neurons primary cultures. We demonstrated a key role of TRPC1 channels in supporting SOC pathway in HD neurons. We concluded that the TRPC1-mediated neuronal SOC pathway constitutes a novel target for HD treatment and that the identified compounds represent a novel class of therapeutic agents for treatment of HD and possibly other neurodegenerative disorders.
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Affiliation(s)
- Jun Wu
- Department of Physiology, UT Southwestern Medical Center, Dallas, TX 75390, USA
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Felsenstein KM, Spaulding D, Yang Z, Hodgdon H, Costa D, Nolan S, Wen M, Lee W, Hrdlicka L, Catana F, Albayya F, Tu Z, Patzke H, Chesworth R, Shapiro G, Zaninovic I, Ahlijanian M, Koenig G, Rogers K. P3‐295: Pharmacokinetic and pharmacodynamic analysis of the gamma‐secretase modulator (GSM) EVP‐0015962. Alzheimers Dement 2010. [DOI: 10.1016/j.jalz.2010.05.1795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | | | | | | | - Don Costa
- EnVivo PharmaceuticalsWatertown MA USA
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Rogers K, Chesworth R, Felsenstein K, Shapiro G, Albayya F, Tu Z, Spaulding D, Catana F, Hrdlicka L, Nolan S, Wen M, Yang Z, Vulsteke V, Patzke H, Koenig G, DeStrooper B, Ahlijanian M. P3‐291: Putative gamma secretase modulators lower Aβ
42
in multiple in vitro and in vivo models. Alzheimers Dement 2009. [DOI: 10.1016/j.jalz.2009.04.962] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Boess F, Vry J, Erb C, Flessner T, Hendrix M, Luithle J, Methfessel C, Schnizler K, Staay FJ, Kampen M, Wiese W, Koenig G. P1‐234: Pharmacological and behavioral profile of EVP‐5141, a novel α7 nicotinic acetylcholine receptor agonist. Alzheimers Dement 2009. [DOI: 10.1016/j.jalz.2009.04.241] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Frank Boess
- Lilly DeutschlandBad HomburgGermany
- Bayer Healthcare AGWuppertalGermany
| | - Jean Vry
- Bayer Healthcare AGWuppertalGermany
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Hilt D, Gawryl M, Koenig G. P4‐348: Evp‐6124: Safety, Tolerability And Cognitive Effects Of A Novel A7 Nicotinic Receptor Agonist In Alzheimer's Disease Patients On Stable Donepezil Or Rivastigmine Therapy. Alzheimers Dement 2009. [DOI: 10.1016/j.jalz.2009.07.147] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [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)
- Dana Hilt
- EnVivo Pharmaceuticals Inc.WatertownMAUSA
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Boess FG, De Vry J, Erb C, Flessner T, Hendrix M, Luithle J, Methfessel C, Riedl B, Schnizler K, van der Staay FJ, van Kampen M, Wiese WB, Koenig G. The novel alpha7 nicotinic acetylcholine receptor agonist N-[(3R)-1-azabicyclo[2.2.2]oct-3-yl]-7-[2-(methoxy)phenyl]-1-benzofuran-2-carboxamide improves working and recognition memory in rodents. J Pharmacol Exp Ther 2007; 321:716-25. [PMID: 17308038 DOI: 10.1124/jpet.106.118976] [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: 11/22/2022] Open
Abstract
The relative contribution of alpha4beta2, alpha7 and other nicotinic acetylcholine receptor (nAChR) subtypes to the memory enhancing versus the addictive effects of nicotine is the subject of ongoing debate. In the present study, we characterized the pharmacological and behavioral properties of the alpha7 nAChR agonist N-[(3R)-1-azabicyclo[2.2.2]oct-3-yl]-7-[2-(methoxy)phenyl]-1-benzofuran-2-carboxamide (ABBF). ABBF bound to alpha7 nAChR in rat brain membranes (Ki=62 nM) and to recombinant human 5-hydroxytryptamine (5-HT)3 receptors (Ki=60 nM). ABBF was a potent agonist at the recombinant rat and human alpha7 nAChR expressed in Xenopus oocytes, but it did not show agonist activity at other nAChR subtypes. ABBF acted as an antagonist of the 5-HT3 receptor and alpha3beta4, alpha4beta2, and muscle nAChRs (at higher concentrations). ABBF improved social recognition memory in rats (0.3-1 mg/kg p.o.). This improvement was blocked by intracerebroventricular administration of the alpha7 nAChR antagonist methyllycaconitine at 10 microg, indicating that it is mediated by alpha7 nAChR agonism. In addition, ABBF improved working memory of aged rats in a water maze repeated acquisition paradigm (1 mg/kg p.o.) and object recognition memory in mice (0.3-1 mg/kg p.o.). Rats trained to discriminate nicotine (0.4 mg/kg s.c.) from vehicle did not generalize to ABBF (0.3-30 mg/kg p.o.), suggesting that the nicotine cue is not mediated by the alpha7 nAChR and that selective alpha7 nAChR agonists may not share the abuse liability of nicotine. Our results support the hypothesis that alpha7 nAChR agonists may provide a novel therapeutic strategy for the treatment of cognitive deficits with low abuse potential.
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Affiliation(s)
- Frank G Boess
- Pharma Research CNS, Medicinal Chemistry, Bayer HealthCare AG, Wuppertal, Germany
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Affiliation(s)
- F. Krafft
- Laboratorium des Prof. F. Krafft, Heidelberg
| | - G. Koenig
- Laboratorium des Prof. F. Krafft, Heidelberg
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Boess FG, Hendrix M, van der Staay FJ, Erb C, Schreiber R, van Staveren W, de Vente J, Prickaerts J, Blokland A, Koenig G. Inhibition of phosphodiesterase 2 increases neuronal cGMP, synaptic plasticity and memory performance. Neuropharmacology 2004; 47:1081-92. [PMID: 15555642 DOI: 10.1016/j.neuropharm.2004.07.040] [Citation(s) in RCA: 244] [Impact Index Per Article: 12.2] [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: 03/23/2004] [Revised: 06/02/2004] [Accepted: 07/28/2004] [Indexed: 10/25/2022]
Abstract
An essential element of the signalling cascade leading to synaptic plasticity is the intracellular second messenger molecule guanosine 3',5'-cyclic monophosphate (cGMP). Using the novel, potent, and selective inhibitor Bay 60-7550, we show that the enzyme 3',5'-cyclic nucleotide phosphodiesterase type 2 (PDE2) is responsible for the degradation of newly synthesized cGMP in cultured neurons and hippocampal slices. Inhibition of PDE2 enhanced long-term potentiation of synaptic transmission without altering basal synaptic transmission. Inhibition of PDE2 also improved the performance of rats in social and object recognition memory tasks, and reversed MK801-induced deficits in spontaneous alternation in mice in a T-maze. Our data provide strong evidence that inhibition of PDE2 can improve memory functions by enhancing neuronal plasticity.
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Affiliation(s)
- Frank G Boess
- Bayer Healthcare AG, Pharma Research CNS, 42096 Wuppertal-Elberfeld, Germany
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Fisher MC, Koenig G, White TJ, Taylor JW. A test for concordance between the multilocus genealogies of genes and microsatellites in the pathogenic fungus Coccidioides immitis. Mol Biol Evol 2000; 17:1164-74. [PMID: 10908636 DOI: 10.1093/oxfordjournals.molbev.a026399] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [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: 11/13/2022] Open
Abstract
Uncovering the correct phylogeny of closely related species requires analysis of multiple gene genealogies or, alternatively, genealogies inferred from the multiple alleles found at highly polymorphic loci, such as microsatellites. However, a concern in using microsatellites is that constraints on allele sizes may occur, resulting in homoplasious distributions of alleles, leading to incorrect phylogenies. Seven microsatellites from the pathogenic fungus Coccidioides immitis were sequenced for 20 clinical isolates chosen to represent the known genetic diversity of the pathogen. An organismal phylogeny for C. immitis was inferred from microsatellite-flanking sequence polymorphisms and other restriction fragment length polymorphism-containing loci. Two microsatellite genetic distances were then used to determine phylogenies for C. immitis, and the trees found by these three methods were compared. Congruence between the organismal and microsatellite phylogenies occurred when microsatellite distances were based on simple allele frequency data. However, complex mutation events at some loci made distances based on stepwise mutation models unreliable. Estimates of times of divergence for the two species of C. immitis based on microsatellites were significantly lower than those calculated from flanking sequence, most likely due to constraints on microsatellite allele sizes. Flanking-sequence insertions/deletions significantly decreased the accuracy of genealogical information inferred from microsatellite loci and caused interspecific length homoplasies at one of the seven loci. Our analysis shows that microsatellites are useful phylogenetic markers, although care should be taken to choose loci with appropriate flanking sequences when they are intended for use in evolutionary studies.
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Affiliation(s)
- M C Fisher
- Department of Plant and Microbial Biology, University of California at Berkeley. Roche Molecular Systems, Alameda, California 94720-3102, USA.
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McPeters RD, Hofmann DJ, Clark M, Flynn L, Froidevaux L, Gross M, Johnson B, Koenig G, Liu X, McDermid S, McGee T, Murcray F, Newchurch MJ, Oltmans S, Parrish A, Schnell R, Singh U, Tsou JJ, Walsh T, Zawodny JM. Results from the 1995 Stratospheric Ozone Profile Intercomparison at Mauna Loa. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jd900760] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Slusser J, Gibson J, Bigelow D, Kolinski D, Mou W, Koenig G, Beaubien A. Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers. Appl Opt 1999; 38:1543-1551. [PMID: 18305778 DOI: 10.1364/ao.38.001543] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The U.S. Department of Agriculture UV-B Monitoring Program measures ultraviolet light at seven wavelengths from 300 to 368 nm with an ultraviolet multifilter rotating shadow-band radiometer (UV-MFRSR) at 25 sites across the United States, including Mauna Loa, Hawaii. Column ozone has been retrieved under all-sky conditions near Boulder, Colorado (40.177 degrees N, 105.276 degrees W), from global irradiances of the UV-MFRSR 332- and 305-nm channels (2 nm FWHM) using lookup tables generated from a multiple-scattering radiative transfer code suitable for solar zenith angles (SZA's) up to 90 degrees. The most significant sources of error for UV-MFRSR column ozone retrievals at SZA's less than 75 degrees are the spectral characterizations of the filters and the absolute calibration uncertainty, which together yield an estimated uncertainty in ozone retrievals of +/-4.0%. Using model sensitivity studies, we determined that the retrieved column ozone is relatively insensitive (<+/-2%) to typical variations in aerosol optical depth, cloud cover, surface pressure, stratospheric temperature, and surface albedo. For 5 months in 1996-1997 the mean ratio of column ozone retrieved by the UV-MFRSR divided by that retrieved by the collocated Brewer was 1.024 and for the UV-MFRSR divided by those from a nearby Dobson was 1.025. The accuracy of the retrieval becomes unreliable at large SZA's of more than 75 degrees as the detection limit of the 305-nm channel is reached and because of overall angular response errors. The UV-MFRSR advantages of relatively low cost, unattended operation, automated calibration stability checks using Langley plots, and minimal maintenance make it a unique instrument for column ozone measurement.
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Affiliation(s)
- J Slusser
- UV-B Radiation Monitoring Program, Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado 80523, USA.
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Abstract
Immunoglobulin E (IgE) plays an important role in allergy, acting as an initiating factor and being involved in its persistence and exacerbations. As interleukin-4 (IL-4) is critical in IgE synthesis, we propose that treatment of mice with monoclonal anti-IL-4 (11B11) prior to active sensitization with ovalbumin will inhibit IgE synthesis, therefore arresting the allergic process at an early stage. Mice treated with 11B11 and sensitized with saline or ovalbumin had significantly less serum IgE than their respective control groups which were treated with saline (p < 0.05). This study suggests that anti-IL-4 may be a prophylactic agent in asthma and allergic disease.
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Affiliation(s)
- C Y Zhou
- Creighton University Allergic Disease Center, Omaha, Nebraska 68178, USA
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Abstract
Systemic mastocytosis was diagnosed in a 4-year-old, female Nubian goat. Clinically, the animal was depressed and had severe macrocytic hypochromic anemia and leukopenia. Postmortem examination revealed neoplastic mast cells invading the heart, lung, liver, spleen, lymph nodes, and bone marrow. Eosinophils were frequently admixed with infiltrating mast cells in all organs. Using routine light microscopy, histochemistry, and transmission electron microscopy, metachromatic and periodic acid-Schiff-positive granules were identified within the cytoplasm of neoplastic mast cells. Erythrophagocytosis was observed in some neoplastic cells, although its contribution to the anemia was not clear. This report represents the first description of mast cell neoplasia in the goat.
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Affiliation(s)
- K N Khan
- Department of Veterinary Pathobiology, Ohio State University, Columbus 43210, USA
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Brodie SJ, de la Concha-Bermejillo A, Koenig G, Snowder GD, DeMartini JC. Maternal factors associated with prenatal transmission of ovine lentivirus. J Infect Dis 1994; 169:653-7. [PMID: 8158044 DOI: 10.1093/infdis/169.3.653] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [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: 01/29/2023] Open
Abstract
Prenatal transmission of ovine lentivirus (OvLV) was studied in 85 eyes and their offspring. The animals were from a flock with endemic OvLV infection and 49 (58%) had serum antibodies to OvLV. Blood was collected from all lambs before they nursed. Using the polymerase chain reaction (PCR), OvLV DNA was detected in peripheral blood mononuclear cells of 13 (11%) of 117 lambs, including two sets of twins. Mothers with OvLV-infected lambs (n = 11) were younger (mean, 2.5 years) and had fewer pregnancies (mean, 2.4) than seropositive ewes (3.2 years and 3.2 pregnancies; P < .05). Of mothers with OvLV-positive lambs, 4 had plasma antigenemia (mean, 31.3 +/- 2.1 ng/mL OvLV) in conjunction with indeterminate antiviral antibody responses by immunoblotting. These results suggest that maternal factors (age and parity) and host-virus interactions (antiviral antibody and antigenemia) are important risk factors in prenatal transmission of OvLV.
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Affiliation(s)
- S J Brodie
- New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts
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41
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Simon DM, Koenig G, Trenholme GM. Differences in release of tumor necrosis factor from THP-1 cells stimulated by filtrates of antibiotic-killed Escherichia coli. J Infect Dis 1991; 164:800-2. [PMID: 1894940 DOI: 10.1093/infdis/164.4.800] [Citation(s) in RCA: 50] [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: 12/29/2022] Open
Abstract
Bacterial products, such as endotoxin, activate mononuclear cells to produce tumor necrosis factor (TNF) and other monokines capable of producing host cell injury. THP-1 cell TNF release in response to bacterial products generated during antibiotic killing of Escherichia coli (ATCC 12014) was evaluated. THP-1 is a mature monocytic leukemia cell line that produces TNF in a dose-dependent fashion in response to purified endotoxin. E. coli were incubated in the presence of amikacin, ciprofloxacin, ceftazidime, cefotaxime, aztreonam, or imipenem at concentrations that killed greater than 99.9% of the organisms. Aliquots of these antibiotic-bacterial cultures were added to THP-1 cells, and TNF concentrations were determined by specific immunoassay. Amikacin and imipenem produced rapid bacterial killing and were associated with low TNF levels. Ceftazidime, aztreonam, and cefotaxime killed E. coli at a slower rate and were associated with significant increases in mononuclear cell TNF responses. Ciprofloxacin produced intermediate TNF levels. Differences exist among bactericidal antibodies in their ability to generate products capable of stimulating mononuclear cell TNF release.
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Affiliation(s)
- D M Simon
- Department of Medicine, Rush-Presbyterian-St. Luke's Medical Center, Chicago, IL 60612
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42
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Wehle K, Blanke M, Koenig G, Pfitzer P. The cytological diagnosis of Pneumocystis carinii by fluorescence microscopy of Papanicolaou stained bronchoalveolar lavage specimens. Cytopathology 1991; 2:113-20. [PMID: 1718475 DOI: 10.1111/j.1365-2303.1991.tb00395.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [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: 12/28/2022]
Abstract
In a retrospective and prospective analysis fluorescence microscopy of Papanicolaou stained bronchoalveolar lavage specimens has been applied to the diagnosis of Pneumocystis carinii (PC) in routine cytology. The pneumocysts presented as circular structures of 5 microns in diameter and of brilliant green-yellow fluorescence surrounding two mirror image reniform structures. Fluorescent inclusions of 1-3 microns diameter within the alveolar macrophages could be identified as remnants of pneumocysts by a follow-up of all steps of degradation ending in very small irregular granules. By applying both criteria, i.e. pneumocysts with reniform bodies and degradation inclusions within macrophages, Pneumocystis carinii pneumonitis (PCP) could be detected in 100% of cases. Transbronchial biopsy permitted the correct diagnosis in only 65.2% of cases. Retrospective analysis of slides is possible after a long period as no significant loss of fluorescence occurs after 4 years. Thus fluorescence microscopy permits the diagnosis of Pneumocystis carinii without any additional staining or loss of time.
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Affiliation(s)
- K Wehle
- Department of Cytopathology, Heinrich-Heine-University, Düsseldorf, Germany
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43
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Fritz P, Arold N, Mischlinski A, Wisser H, Oeffinger B, Neuhoff V, Laschner W, Koenig G. Two-dimensional electrophoresis of synovial tissue, synovial fluid and serum in patients with rheumatoid arthritis and related diseases. Rheumatol Int 1990; 10:177-83. [PMID: 2075369 DOI: 10.1007/bf02274830] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [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: 12/30/2022]
Abstract
Using the technique of two-dimensional (2D) electrophoresis with consecutive silver staining, we investigated samples of serum, synovial fluid and synovial tissue obtained from 19 patients suffering from rheumatoid arthritis (RA) or non-RA arthritis. From these experiments we have drawn the following conclusions. 2D electrophoresis of serum, synovial fluid and synovial tissue extracts taken from patients suffering from joint diseases is a reproducible method. Repeated runs of the same sample reveal an essentially constant protein spot pattern. The time period between surgery and tissue preparation did not influence the number of protein spots when less than 15 h was involved. The protein spot number is always lower in synovial fluid than in either synovial tissue or serum in RA and non-RA patients. The mean value for the number of spots is 68 for the inflamed tissue irrespective of the cause of arthritis (RA and non-RA group taken together) and 47 for the control group. This difference is significant. We were able to definitely identify 7 spots in the tissue extract. We did not find RA-specific protein spots in either serum, synovial fluid or tissue extracts from the synovial membrane. The only significant difference between RA patients and either non-RA or control group patients concerning the protein spot pattern is the increased size of the immunoglobulin spot (mainly IgG) in RA. In addition, we discuss possible reasons for failure of the 2D electrophoresis technique to detect disease-specific protein patterns.
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Affiliation(s)
- P Fritz
- Pathologisches Institut, Robert Bosch-Krankenhaus, Stuttgart, Federal Republic of Germany
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Abstract
Report of follow-up studies in 65 children with occipital slow rhythms in the EEG (287 records). Two types of occipital rhythms can be differentiated: Paroxysmal bursts of 3--4/s-rhythms with high amplitude (I) accentuated by closing eyes and continuous usually regular occipital 3--4/s-rhythms (II). Type I is identical with the sinusoidal occipital 3/s-rhythms, which are observed especially frequently in childhood epilepsies. It could be demonstrated by follow-up studies, that the phenomenon usually disappears at latest during puberty. --The second type may also disappear during puberty or may even persist until the adult age. This persisting type is identical with what is quoted as "Grundrhythmusvariante" in the German literature. The continuous occipital rhythms could be demonstrated at earliest at age 3. The rhythms change their shape, amplitude, frequency and localisation during growth: In children prior to age 10 the rhythms show more often occipital accentuation in monopolar leads (against ear as reference); the amplitudes are higher on average; the frequency is often less than 4/s, and alpha groups preceding the rhythms after closing the eyes are less pronounced than in older children. Subharmonic waves are frequent. In the same manner as in adults a mostly right sided lateralisation can be seen. Genetic factors may be involved in the development of the occipital rhythms, although a simple mendelian transmission could not be confirmed. The EEG phenomenon is correlated with symptoms of psychic and vegetative lability. There is no correlation to epilepsy. The high incidence of anamnestic risk factors suggests that exogenous factors are at least contributing to the development of the rhythms. The continuous occipital 3--4/s-rhythms must be understood as the symptom of a disturbed development of central pacemaker systems. It can lead to persisting abnormalities or only occur transitorily in certain stages of the brain maturation.
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Abstract
Feline spinal cords were traumatised by the weight dropping technique. Five trauma groups were studied (5 g X 80 cm, 10 g X 40 cm, 20 g X 20 cm, 40 g X 10 cm, and 80 g X 5 cm), each having a 'standardised' injury of '400 g--cm.' The spinal cords were sectioned serially two hours after contusion and examined by light microscopy. Relative to the larger weights falling from lesser heights, the smaller weights falling from greater heights were associated with less haemorrhage, oedema, axonal disruption, and myelin fragmentation as well as a smaller volume of grey matter containing altered anterior horn cells. In all trauma groups the cortical evoked responses disappeared at the time of the injury and did not reappear. Even though each trauma group received a '400 g--cm' contusion, each weight--height combination was associated with differing degrees of histopathological alterations. A plea is made for more accurate quantitation of experimental spinal cord trauma than the 'g--cm' unit.
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Koenig G. [Advantages and use of precise high frequency power measurements of dosage used as short wave therapy]. Elektromed Biomed Tech 1969; 14:98-103. [PMID: 5385976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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