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Ganesh BH, Raj AG, Aruchamy B, Nanjan P, Drago C, Ramani P. Pyrrole: A Decisive Scaffold for the Development of Therapeutic Agents and Structure-Activity Relationship. ChemMedChem 2024; 19:e202300447. [PMID: 37926686 DOI: 10.1002/cmdc.202300447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 10/25/2023] [Accepted: 11/01/2023] [Indexed: 11/07/2023]
Abstract
An overview of pyrroles as distinct scaffolds with therapeutic potential and the significance of pyrrole derivatives for drug development are provided in this article. It lists instances of naturally occurring pyrrole-containing compounds and describes the sources of pyrroles in nature, including plants and microbes. It also explains the many conventional and modern synthetic methods used to produce pyrroles. The key topics are the biological characteristics, pharmacological behavior, and functional alterations displayed by pyrrole derivatives. It also details how pyrroles are used to treat infectious diseases. It describes infectious disorders resistant to standard treatments and discusses the function of compounds containing pyrroles in combating infectious diseases. Furthermore, the review covers the uses of pyrrole derivatives in treating non-infectious diseases and resistance mechanisms in non-infectious illnesses like cancer, diabetes, and Alzheimer's and Parkinson's diseases. The important discoveries and probable avenues for pyrrole research are finally summarized, along with their significance for medicinal chemists and drug development. A reference from the last two decades is included in this review.
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Affiliation(s)
- Bharathi Hassan Ganesh
- Dhanvanthri Laboratory, Department of Sciences, Amrita School of Physical Sciences, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
- Center of Excellence in Advanced Materials & Green Technologies (CoE-AMGT), Amrita School of Engineering, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
| | - Anirudh G Raj
- Dhanvanthri Laboratory, Department of Sciences, Amrita School of Physical Sciences, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
| | - Baladhandapani Aruchamy
- Dhanvanthri Laboratory, Department of Sciences, Amrita School of Physical Sciences, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
- Center of Excellence in Advanced Materials & Green Technologies (CoE-AMGT), Amrita School of Engineering, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
| | - Pandurangan Nanjan
- Dhanvanthri Laboratory, Department of Sciences, Amrita School of Physical Sciences, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
- Amrita School of Engineering, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
| | - Carmelo Drago
- Institute of Biomolecular Chemistry CNR, via Paolo Gaifami 18, 95126, Catania, Italy
| | - Prasanna Ramani
- Dhanvanthri Laboratory, Department of Sciences, Amrita School of Physical Sciences, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
- Center of Excellence in Advanced Materials & Green Technologies (CoE-AMGT), Amrita School of Engineering, Coimbatore, 641112, Amrita Vishwa Vidyapeetham, India
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2
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Urvashi, Senthil Kumar JB, Das P, Tandon V. Development of Azaindole-Based Frameworks as Potential Antiviral Agents and Their Future Perspectives. J Med Chem 2022; 65:6454-6495. [PMID: 35477274 PMCID: PMC9063994 DOI: 10.1021/acs.jmedchem.2c00444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Indexed: 11/29/2022]
Abstract
The azaindole (AI) framework continues to play a significant role in the design of new antiviral agents. Modulating the position and isosteric replacement of the nitrogen atom of AI analogs notably influences the intrinsic physicochemical properties of lead compounds. The intra- and intermolecular interactions of AI derivatives with host receptors or viral proteins can also be fine tuned by carefully placing the nitrogen atom in the heterocyclic core. This wide-ranging perspective article focuses on AIs that have considerable utility in drug discovery programs against RNA viruses. The inhibition of influenza A, human immunodeficiency, respiratory syncytial, neurotropic alpha, dengue, ebola, and hepatitis C viruses by AI analogs is extensively reviewed to assess their plausible future potential in antiviral drug discovery. The binding interaction of AIs with the target protein is examined to derive a structural basis for designing new antiviral agents.
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Affiliation(s)
- Urvashi
- Drug Discovery Laboratory, Special Centre for
Molecular Medicine, Jawaharlal Nehru University, New Delhi 110
067, India
- Department of Chemistry, University of
Delhi, New Delhi 110007, India
| | - J. B. Senthil Kumar
- Drug Discovery Laboratory, Special Centre for
Molecular Medicine, Jawaharlal Nehru University, New Delhi 110
067, India
| | - Parthasarathi Das
- Department of Chemistry, Indian Institute
of Technology (ISM), Dhanbad 826004, India
| | - Vibha Tandon
- Drug Discovery Laboratory, Special Centre for
Molecular Medicine, Jawaharlal Nehru University, New Delhi 110
067, India
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3
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Saigal, Khizr M, Sahoo SC, Khan MM. Synthesis, characterization, X-ray crystallographic study and in silico ADME predictions of functionalized nitropyrrole derivatives. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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4
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New Sulfanilamide Derivatives Incorporating Heterocyclic Carboxamide Moieties as Carbonic Anhydrase Inhibitors. Pharmaceuticals (Basel) 2021; 14:ph14080828. [PMID: 34451924 PMCID: PMC8398262 DOI: 10.3390/ph14080828] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/12/2021] [Accepted: 08/19/2021] [Indexed: 01/12/2023] Open
Abstract
Carbonic Anhydrases (CAs) are ubiquitous metalloenzymes involved in several disease conditions. There are 15 human CA (hCA) isoforms and their high homology represents a challenge for the discovery of potential drugs devoid of off-target side effects. For this reason, many synthetic and pharmacologic research efforts are underway to achieve the full pharmacological potential of CA modulators of activity. We report here a novel series of sulfanilamide derivatives containing heterocyclic carboxamide moieties which were evaluated as CA inhibitors against the physiological relevant isoforms hCA I, II, IX, and XII. Some of them showed selectivity toward isoform hCA II and hCA XII. Molecular docking was performed for some of these compounds on isoforms hCA II and XII to understand the possible interaction with the active site amino acid residues, which rationalized the reported inhibitory activity.
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5
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Barraza SJ, Sindac JA, Dobry CJ, Delekta PC, Lee PH, Miller DJ, Larsen SD. Synthesis and biological activity of conformationally restricted indole-based inhibitors of neurotropic alphavirus replication: Generation of a three-dimensional pharmacophore. Bioorg Med Chem Lett 2021; 46:128171. [PMID: 34098081 PMCID: PMC8272561 DOI: 10.1016/j.bmcl.2021.128171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/26/2021] [Accepted: 05/30/2021] [Indexed: 11/29/2022]
Abstract
We have previously reported the development of indole-based CNS-active antivirals for the treatment of neurotropic alphavirus infection, but further optimization is impeded by a lack of knowledge of the molecular target and binding site. Herein we describe the design, synthesis and evaluation of a series of conformationally restricted analogues with the dual objectives of improving potency/selectivity and identifying the most bioactive conformation. Although this campaign was only modestly successful at improving potency, the sharply defined SAR of the rigid analogs enabled the definition of a three-dimensional pharmacophore, which we believe will be of value in further analog design and virtual screening for alternative antiviral leads.
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Affiliation(s)
- Scott J Barraza
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States
| | - Janice A Sindac
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States
| | - Craig J Dobry
- Departments of Internal Medicine and Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Philip C Delekta
- Departments of Internal Medicine and Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Pil H Lee
- Vahlteich Medicinal Chemistry Core, University of Michigan, Ann Arbor, MI 48109, United States; Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States
| | - David J Miller
- Departments of Internal Medicine and Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, United States
| | - Scott D Larsen
- Vahlteich Medicinal Chemistry Core, University of Michigan, Ann Arbor, MI 48109, United States; Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States.
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6
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Schmidt EY, Semenova NV, Tatarinova IV, Ushakov IA, Vashchenko AV, Trofimov BA. Functionalized Thieno[3,2‐
b
]pyrroles from Acylthiophenes, Acetylene Gas and Hydrazines in Two Steps. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Elena Yu. Schmidt
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
| | - Nadezhda V. Semenova
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
| | - Inna V. Tatarinova
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
| | - Igor A. Ushakov
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
| | - Alexander V. Vashchenko
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
| | - Boris A. Trofimov
- A. E. Favorsky Irkutsk Institute of Chemistry SB RAS 1 Favorsky St Irkutsk 664033 Russian Federation
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7
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Yue Y, Shao H, Wang Z, Wang K, Wang L, Zhuo K, Liu J. Elemental-Sulfur-Incorporated Cyclizations of Pyrrolidines Leading to Thienopyrroles. J Org Chem 2020; 85:11265-11279. [PMID: 32701277 DOI: 10.1021/acs.joc.0c01363] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report, herein, the synthesis of thieno[3,2-b]pyrroles from the direct oxidative [4 + 1] cyclization of 2-alkynyl pyrrolidines with elemental sulfur. This transformation likely originates from electrophilic attack at the β-position of pyrrolidine followed by an intramolecular thienannulation to deliver the desired product. Mechanistic investigation suggests that the present reaction involves the formation of dihydrothieno[3,2-b]pyrrole as an intermediate.
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Affiliation(s)
- Yuanyuan Yue
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Huibin Shao
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Zhixian Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Ke Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Le Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Kelei Zhuo
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Jianming Liu
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
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8
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Nguyen TH, Haese NN, Madadi N, Sarkar S, Bonin K, Streblow CE, Taft-Benz S, Tower NA, Rasmussen L, Bostwick R, Augelli-Szafran CE, Suto MJ, Morrison TE, DeFilippis V, Heise MT, Streblow DN, Pathak AK. Studies on Dibenzylamines as Inhibitors of Venezuelan Equine Encephalitis Virus. ACS Infect Dis 2019; 5:2014-2028. [PMID: 31257853 DOI: 10.1021/acsinfecdis.9b00035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Alphaviruses are arthropod-transmitted members of the Togaviridae family that can cause severe disease in humans, including debilitating arthralgia and severe neurological complications. Currently, there are no approved vaccines or antiviral therapies directed against the alphaviruses, and care is limited to treating disease symptoms. A phenotypic cell-based high-throughput screen was performed to identify small molecules that inhibit the replication of Venezuelan Equine Encephalitis Virus (VEEV). The compound, 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-N-(3-fluoro-4-methoxybenzyl)ethan-1-amine (1), was identified as a highly active, potent inhibitor of VEEV with an effective concentration for 90% inhibition of virus (EC90) of 0.89 μM and 7.49 log reduction in virus titers at 10 μM concentration. These data suggest that further investigation of compound 1 as an antiviral therapeutic against VEEV, and perhaps other alphaviruses, is warranted. Experiments suggested that the antiviral activity of compound 1 is directed at an early step in the VEEV replication cycle by blocking viral RNA and protein synthesis.
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Affiliation(s)
- Theresa H. Nguyen
- Chemistry Department, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Nicole N. Haese
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, Oregon 97006, United States
| | - Nikhil Madadi
- Chemistry Department, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Sanjay Sarkar
- Department of Genetics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, United States
| | - Kiley Bonin
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, Oregon 97006, United States
| | - Cassilyn E. Streblow
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, Oregon 97006, United States
| | - Sharon Taft-Benz
- Department of Genetics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, United States
| | - Nichole A. Tower
- High-Throughput Screening Center, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Lynn Rasmussen
- High-Throughput Screening Center, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Robert Bostwick
- High-Throughput Screening Center, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Corinne E. Augelli-Szafran
- Chemistry Department, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Mark J. Suto
- Chemistry Department, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Thomas E. Morrison
- Department of Immunology and Microbiology, University of Colorado School of Medicine, 12800 E. 19th Avenue, Aurora, Colorado 80045, United States
| | - Victor DeFilippis
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, Oregon 97006, United States
| | - Mark T. Heise
- Department of Genetics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, United States
| | - Daniel N. Streblow
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, Oregon 97006, United States
| | - Ashish K. Pathak
- Chemistry Department, Drug Discovery Division, Southern Research, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
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9
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Pérez-Pérez MJ, Delang L, Ng LFP, Priego EM. Chikungunya virus drug discovery: still a long way to go? Expert Opin Drug Discov 2019; 14:855-866. [DOI: 10.1080/17460441.2019.1629413] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Leen Delang
- KU Leuven Department of Microbiology and Immunology, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Lisa F. P. Ng
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
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10
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Ching KC, F P Ng L, Chai CLL. A compendium of small molecule direct-acting and host-targeting inhibitors as therapies against alphaviruses. J Antimicrob Chemother 2018; 72:2973-2989. [PMID: 28981632 PMCID: PMC7110243 DOI: 10.1093/jac/dkx224] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Alphaviruses were amongst the first arboviruses to be isolated, characterized and assigned a taxonomic status. They are globally widespread, infecting a large variety of terrestrial animals, birds, insects and even fish. Moreover, they are capable of surviving and circulating in both sylvatic and urban environments, causing considerable human morbidity and mortality. The re-emergence of Chikungunya virus (CHIKV) in almost every part of the world has caused alarm to many health agencies throughout the world. The mosquito vector for this virus, Aedes, is globally distributed in tropical and temperate regions and capable of thriving in both rural and urban landscapes, giving the opportunity for CHIKV to continue expanding into new geographical regions. Despite the importance of alphaviruses as human pathogens, there is currently no targeted antiviral treatment available for alphavirus infection. This mini-review discusses some of the major features in the replication cycle of alphaviruses, highlighting the key viral targets and host components that participate in alphavirus replication and the molecular functions that were used in drug design. Together with describing the importance of these targets, we review the various direct-acting and host-targeting inhibitors, specifically small molecules that have been discovered and developed as potential therapeutics as well as their reported in vitro and in vivo efficacies.
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Affiliation(s)
- Kuan-Chieh Ching
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456.,Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
| | - Lisa F P Ng
- Singapore Immunology Network, A*STAR, 8A Biomedical Grove, Immunos Building, #04-06, Singapore 138648.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Block MD6, Centre for Translational Medicine, 14 Medical Drive, #14-01T, Singapore 117599.,Institute of Infection and Global Health, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool L697BE, UK
| | - Christina L L Chai
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456.,Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
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11
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Balachandra B, Shanmugam S. A Simple and Direct Synthesis of Pentasubstituted Pyrroles via [3+4] Annulation and Their In Vitro Evaluation as Thrombolytic Agents and Cytotoxicity Studies on L929 Cells. ChemistrySelect 2018. [DOI: 10.1002/slct.201702476] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Biguvu Balachandra
- Department of Organic Chemistry; School of Chemistry; Madurai Kamaraj University; Madurai - 625021
| | - Sivakumar Shanmugam
- Department of Organic Chemistry; School of Chemistry; Madurai Kamaraj University; Madurai - 625021
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12
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Lu C, Dong M, Zhu HY. Regioselective Bromination of Thieno[2′,3′:4,5]pyrrolo[1,2-d][1,2,4]triazin-8(7H)-one and Sequential Suzuki Couplings. J Org Chem 2017; 82:9229-9234. [DOI: 10.1021/acs.joc.7b01542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chunliang Lu
- Novartis Institutes for BioMedical Research (China), Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Minyu Dong
- Shanghai ChemPartner Co., Ltd., Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Hugh Y. Zhu
- Novartis Institutes for BioMedical Research (China), Zhangjiang Hi-Tech Park, Shanghai 201203, China
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13
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Abstract
Alphaviruses, such as Chikungunya virus, O’Nyong–Nyong virus, Ross River virus, have been widely known to cause fever, rash, and rheumatic diseases. In addition, several other alphaviruses, for instance Eastern equine encephalitis virus, Venezuelan equine encephalitis virus, and Western equine encephalitis virus, potentially cause fatal encephalitis in humans. These diseases are considered as neglected tropical diseases for which there are no current antiviral therapies or vaccines available. The replication process in alphaviruses depends on four nonstructural proteins, NSP1–NSP4, which are produced as a single polyprotein. Therefore, the Alphavirus-mediated diseases in humans remain challenging among the virologists worldwide. Thus researchers are trying to find out proficient approaches, including the discovery of novel chemotherapeutic agents for the possible management and treatment of infected patients. Attempts were also made to identify an active compound against alphaviruses from natural sources. The genomes of various alphaviruses have already been revealed, and the function of proteins may be predicted by homology modeling, with the known proteins of closely related viruses. With the help of this information of protein modeling and subsequent virtual screening approach, the research teams will be able to identify few potential leads. The drug discovery against various alphaviruses is still in its early stages. Moreover, consolidating the available information and making it available for the scientific community are urgent requirements to expedite the research of potential drug discovery. The current chapter describes the techniques available to prevent Alphavirus infection and to treat Alphavirus-associated malignancies. In addition, we also discuss the recent outcomes in the fields of synthetic and natural medicinal chemistry research that were solely aimed to fight against Alphavirus infection. Thus the present chapter may also help and expedite the drug discovery and development of inhibitors against nonstructural proteins of various alphaviruses.
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14
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Varghese FS, Thaa B, Amrun SN, Simarmata D, Rausalu K, Nyman TA, Merits A, McInerney GM, Ng LFP, Ahola T. The Antiviral Alkaloid Berberine Reduces Chikungunya Virus-Induced Mitogen-Activated Protein Kinase Signaling. J Virol 2016; 90:9743-9757. [PMID: 27535052 PMCID: PMC5068526 DOI: 10.1128/jvi.01382-16] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 08/10/2016] [Indexed: 01/06/2023] Open
Abstract
Chikungunya virus (CHIKV) has infected millions of people in the tropical and subtropical regions since its reemergence in the last decade. We recently identified the nontoxic plant alkaloid berberine as an antiviral substance against CHIKV in a high-throughput screen. Here, we show that berberine is effective in multiple cell types against a variety of CHIKV strains, also at a high multiplicity of infection, consolidating the potential of berberine as an antiviral drug. We excluded any effect of this compound on virus entry or on the activity of the viral replicase. A human phosphokinase array revealed that CHIKV infection specifically activated the major mitogen-activated protein kinase (MAPK) signaling pathways extracellular signal-related kinase (ERK), p38 and c-Jun NH2-terminal kinase (JNK). Upon treatment with berberine, this virus-induced MAPK activation was markedly reduced. Subsequent analyses with specific inhibitors of these kinases indicated that the ERK and JNK signaling cascades are important for the generation of progeny virions. In contrast to specific MAPK inhibitors, berberine lowered virus-induced activation of all major MAPK pathways and resulted in a stronger reduction in viral titers. Further, we assessed the in vivo efficacy of berberine in a mouse model and measured a significant reduction of CHIKV-induced inflammatory disease. In summary, we demonstrate the efficacy of berberine as a drug against CHIKV and highlight the importance of the MAPK signaling pathways in the alphavirus infectious cycle. IMPORTANCE Chikungunya virus (CHIKV) is a mosquito-borne virus that causes severe and persistent muscle and joint pain and has recently spread to the Americas. No licensed drug exists to counter this virus. In this study, we report that the alkaloid berberine is antiviral against different CHIKV strains and in multiple human cell lines. We demonstrate that berberine collectively reduced the virus-induced activation of cellular mitogen-activated protein kinase signaling. The relevance of these signaling cascades in the viral life cycle was emphasized by specific inhibitors of these kinase pathways, which decreased the production of progeny virions. Berberine significantly reduced CHIKV-induced inflammatory disease in a mouse model, demonstrating efficacy of the drug in vivo Overall, this work makes a strong case for pursuing berberine as a potential anti-CHIKV therapeutic compound and for exploring the MAPK signaling pathways as antiviral targets against alphavirus infections.
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Affiliation(s)
- Finny S Varghese
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Bastian Thaa
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Siti Naqiah Amrun
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Singapore
| | - Diane Simarmata
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Singapore
| | - Kai Rausalu
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Tuula A Nyman
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Gerald M McInerney
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Lisa F P Ng
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), Singapore
| | - Tero Ahola
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
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15
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Nebe MM, Kucukdisli M, Opatz T. 3,4-Dihydro-2H-pyrrole-2-carbonitriles: Useful Intermediates in the Synthesis of Fused Pyrroles and 2,2′-Bipyrroles. J Org Chem 2016; 81:4112-21. [DOI: 10.1021/acs.joc.6b00393] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marco M. Nebe
- Institute
of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Murat Kucukdisli
- Institute
of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Till Opatz
- Institute
of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
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16
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Varghese FS, Kaukinen P, Gläsker S, Bespalov M, Hanski L, Wennerberg K, Kümmerer BM, Ahola T. Discovery of berberine, abamectin and ivermectin as antivirals against chikungunya and other alphaviruses. Antiviral Res 2016; 126:117-24. [PMID: 26752081 DOI: 10.1016/j.antiviral.2015.12.012] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 12/10/2015] [Accepted: 12/29/2015] [Indexed: 01/01/2023]
Abstract
Chikungunya virus (CHIKV) is an arthritogenic arbovirus of the Alphavirus genus, which has infected millions of people after its re-emergence in the last decade. In this study, a BHK cell line containing a stable CHIKV replicon with a luciferase reporter was used in a high-throughput platform to screen approximately 3000 compounds. Following initial validation, 25 compounds were chosen as primary hits for secondary validation with wild type and reporter CHIKV infection, which identified three promising compounds. Abamectin (EC50 = 1.5 μM) and ivermectin (EC50 = 0.6 μM) are fermentation products generated by a soil dwelling actinomycete, Streptomyces avermitilis, whereas berberine (EC50 = 1.8 μM) is a plant-derived isoquinoline alkaloid. They inhibited CHIKV replication in a dose-dependent manner and had broad antiviral activity against other alphaviruses--Semliki Forest virus and Sindbis virus. Abamectin and ivermectin were also active against yellow fever virus, a flavivirus. These compounds caused reduced synthesis of CHIKV genomic and antigenomic viral RNA as well as downregulation of viral protein expression. Time of addition experiments also suggested that they act on the replication phase of the viral infectious cycle.
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Affiliation(s)
- Finny S Varghese
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Pasi Kaukinen
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Sabine Gläsker
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Maxim Bespalov
- Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland
| | - Leena Hanski
- Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Krister Wennerberg
- Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland
| | - Beate M Kümmerer
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Tero Ahola
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland.
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17
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Gholap SS. Pyrrole: An emerging scaffold for construction of valuable therapeutic agents. Eur J Med Chem 2015; 110:13-31. [PMID: 26807541 DOI: 10.1016/j.ejmech.2015.12.017] [Citation(s) in RCA: 228] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 12/05/2015] [Accepted: 12/10/2015] [Indexed: 12/20/2022]
Abstract
Pyrrole derivatives comprise a class of biologically active heterocyclic compounds which can serve as promising scaffolds for antimicrobial, antiviral, antimalarial, antitubercular, anti-inflammatory and enzyme inhibiting drugs. Due to their inimitable anticancer and anti-tubercular properties, researchers were inspired to develop novel pyrrole derivatives for the treatment of MDR pathogens. In the present review the main target is to focus on the development of pyrrole mimics, with emphasis based on their structure activity relationship (SAR). The present review is being obliging for the future development of pyrrole therapeutics.
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Affiliation(s)
- Somnath S Gholap
- Department of Chemistry, Padmashri Vikhe Patil College, Pravaranagar (Loni kd.), Rahata, Ahmednagar, 413713, Maharashtra, India.
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18
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Ching KC, Kam YW, Merits A, Ng LFP, Chai CLL. Trisubstituted Thieno[3,2-b]pyrrole 5-Carboxamides as Potent Inhibitors of Alphaviruses. J Med Chem 2015; 58:9196-213. [DOI: 10.1021/acs.jmedchem.5b01047] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kuan-Chieh Ching
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456
- Department
of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
| | - Yiu-Wing Kam
- Singapore
Immunology Network, A*STAR, 8A Biomedical Grove, Immunos Building,
Level 4, Singapore 138648
| | - Andres Merits
- Institute
of Technology, University of Tartu, Nooruse 1, Tartu, Estonia 50411
| | - Lisa F. P. Ng
- Singapore
Immunology Network, A*STAR, 8A Biomedical Grove, Immunos Building,
Level 4, Singapore 138648
- Department
of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Block MD6, Centre for Translational Medicine, 14 Medical Drive, #14-01T, Singapore 117599
| | - Christina L. L. Chai
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456
- Department
of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
- Institute
of Chemical and Engineering Sciences, A*STAR, 8 Biomedical Grove, Neuros Building,
#07-01/02/03, Singapore 138665
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19
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Larsen MJ, Larsen SD, Fribley A, Grembecka J, Homan K, Mapp A, Haak A, Nikolovska-Coleska Z, Stuckey JA, Sun D, Sherman DH. The role of HTS in drug discovery at the University of Michigan. Comb Chem High Throughput Screen 2015; 17:210-30. [PMID: 24409957 DOI: 10.2174/1386207317666140109121546] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Revised: 11/05/2013] [Accepted: 01/07/2014] [Indexed: 12/17/2022]
Abstract
High throughput screening (HTS) is an integral part of a highly collaborative approach to drug discovery at the University of Michigan. The HTS lab is one of four core centers that provide services to identify, produce, screen and follow-up on biomedical targets for faculty. Key features of this system are: protein cloning and purification, protein crystallography, small molecule and siRNA HTS, medicinal chemistry and pharmacokinetics. Therapeutic areas that have been targeted include anti-bacterial, metabolic, neurodegenerative, cardiovascular, anti-cancer and anti-viral. The centers work in a coordinated, interactive environment to affordably provide academic investigators with the technology, informatics and expertise necessary for successful drug discovery. This review provides an overview of these centers at the University of Michigan, along with case examples of successful collaborations with faculty.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - David H Sherman
- Center for Chemical Genomics, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
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20
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Barraza SJ, Delekta PC, Sindac JA, Dobry CJ, Xiang J, Keep RF, Miller DJ, Larsen SD. Discovery of anthranilamides as a novel class of inhibitors of neurotropic alphavirus replication. Bioorg Med Chem 2015; 23:1569-87. [PMID: 25740634 DOI: 10.1016/j.bmc.2015.01.054] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/22/2015] [Accepted: 01/30/2015] [Indexed: 01/16/2023]
Abstract
Neurotropic alphaviruses are debilitating pathogens that infect the central nervous system (CNS) and are transmitted to humans via mosquitoes. There exist no effective human vaccines against these viruses, underlining the need for effective antivirals, but no antiviral drugs are available for treating infection once the viruses have invaded the CNS. Previously, we reported the development of novel indole-2-carboxamide-based inhibitors of alphavirus replication that demonstrate significant reduction of viral titer and achieve measurable brain permeation in a pharmacokinetic mouse model. Herein we report our continued efforts to improve physicochemical properties predictive of in vivo blood-brain barrier (BBB) permeability through reduction of overall molecular weight, replacing the indole core with a variety of aromatic and non-aromatic monocyclics. These studies culminated in the identification of simple anthranilamides that retain excellent potency with improved metabolic stability and significantly greater aqueous solubility. Furthermore, in a live virus study, we showed that two new compounds were capable of reducing viral titer by two orders of magnitude and that these compounds likely exert their effects through a mechanism similar to that of our indole-2-carboxamide inhibitors.
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Affiliation(s)
- Scott J Barraza
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States
| | - Philip C Delekta
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, United States
| | - Janice A Sindac
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States
| | - Craig J Dobry
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, United States
| | - Jianming Xiang
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI 48109, United States
| | - Richard F Keep
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI 48109, United States
| | - David J Miller
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, United States; Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, United States.
| | - Scott D Larsen
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States; Vahlteich Medicinal Chemistry Core, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, United States.
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21
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Delekta PC, Raveh A, Larsen MJ, Schultz PJ, Tamayo-Castillo G, Sherman DH, Miller DJ. The combined use of alphavirus replicons and pseudoinfectious particles for the discovery of antivirals derived from natural products. ACTA ACUST UNITED AC 2014; 20:673-80. [PMID: 25550354 DOI: 10.1177/1087057114564868] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 11/28/2014] [Indexed: 11/15/2022]
Abstract
Alphaviruses are a prominent class of reemergent pathogens due to their globally expanding ranges, potential for lethality, and possible use as bioweapons. The absence of effective treatments for alphaviruses highlights the need for innovative strategies to identify antiviral agents. Primary screens that use noninfectious self-replicating RNAs, termed replicons, have been used to identify potential antiviral compounds for alphaviruses. Only inhibitors of viral genome replication, however, will be identified using replicons, which excludes many other druggable steps in the viral life cycle. To address this limitation, we developed a western equine encephalitis virus pseudoinfectious particle system that reproduces several crucial viral life cycle steps in addition to genome replication. We used this system to screen a library containing ~26,000 extracts derived from marine microbes, and we identified multiple bacterial strains that produce compounds with potential antiviral activity. We subsequently used pseudoinfectious particle and replicon assays in parallel to counterscreen candidate extracts, and followed antiviral activity during biochemical fractionation and purification to differentiate between inhibitors of viral entry and genome replication. This novel process led to the isolation of a known alphavirus entry inhibitor, bafilomycin, thereby validating the approach for the screening and identification of potential antiviral compounds.
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Affiliation(s)
- Phillip C Delekta
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Avi Raveh
- Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
| | - Martha J Larsen
- Center for Chemical Genomics, University of Michigan, Ann Arbor, MI, USA
| | - Pamela J Schultz
- Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
| | | | - David H Sherman
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA Department of Chemistry and Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
| | - David J Miller
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI, USA
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22
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Blakely PK, Delekta PC, Miller DJ, Irani DN. Manipulation of host factors optimizes the pathogenesis of western equine encephalitis virus infections in mice for antiviral drug development. J Neurovirol 2014; 21:43-55. [PMID: 25361697 DOI: 10.1007/s13365-014-0297-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 09/18/2014] [Accepted: 09/24/2014] [Indexed: 11/25/2022]
Abstract
While alphaviruses spread naturally via mosquito vectors, some can also be transmitted as aerosols making them potential bioterrorism agents. One such pathogen, western equine encephalitis virus (WEEV), causes fatal human encephalitis via multiple routes of infection and thus presumably via multiple mechanisms. Although WEEV also produces acute encephalitis in non-human primates, a small animal model that recapitulates features of human disease would be useful for both pathogenesis studies and to evaluate candidate antiviral therapies. We have optimized conditions to infect mice with a low passage isolate of WEEV, thereby allowing detailed investigation of virus tropism, replication, neuroinvasion, and neurovirulence. We find that host factors strongly influence disease outcome, and in particular, that age, gender, and genetic background all have significant effects on disease susceptibility independent of virus tropism or replication within the central nervous system. Our data show that experimental variables can be adjusted in mice to recapitulate disease features known to occur in both non-human primates and humans, thus aiding further study of WEEV pathogenesis and providing a realistic therapeutic window for antiviral drug delivery.
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MESH Headings
- Administration, Intranasal
- Alphavirus Infections/pathology
- Alphavirus Infections/virology
- Animals
- Behavior, Animal
- Cognition
- Disease Models, Animal
- Encephalitis Virus, Western Equine/pathogenicity
- Encephalitis Virus, Western Equine/physiology
- Host Specificity
- Injections, Intraperitoneal
- Injections, Subcutaneous
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Inbred DBA
- RNA, Viral/blood
- Seizures/pathology
- Seizures/virology
- Species Specificity
- Viral Load
- Virus Replication
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Affiliation(s)
- Pennelope K Blakely
- Department of Neurology, University of Michigan Medical School, 4007 Biomedical Sciences Research Building, 109 Zina Pitcher Place, Ann Arbor, MI, 48109-2200, USA
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23
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Schroeder CE, Yao T, Sotsky J, Smith RA, Roy S, Chu YK, Guo H, Tower NA, Noah JW, McKellip S, Sosa M, Rasmussen L, Smith LH, White EL, Aubé J, Jonsson CB, Chung D, Golden JE. Development of (E)-2-((1,4-dimethylpiperazin-2-ylidene)amino)-5-nitro-N-phenylbenzamide, ML336: Novel 2-amidinophenylbenzamides as potent inhibitors of venezuelan equine encephalitis virus. J Med Chem 2014; 57:8608-21. [PMID: 25244572 PMCID: PMC4207539 DOI: 10.1021/jm501203v] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
Venezuelan equine encephalitis virus
(VEEV) is an emerging pathogenic
alphavirus that can cause significant disease in humans. Given the
absence of therapeutic options available and the significance of VEEV
as a weaponized agent, an optimization effort was initiated around
a quinazolinone screening hit 1 with promising cellular
antiviral activity (EC50 = 0.8 μM), limited cytotoxic
liability (CC50 > 50 μM), and modest in vitro
efficacy
in reducing viral progeny (63-fold at 5 μM). Scaffold optimization
revealed a novel rearrangement affording amidines, specifically compound 45, which was found to potently inhibit several VEEV strains
in the low nanomolar range without cytotoxicity (EC50 =
0.02–0.04 μM, CC50 > 50 μM) while
limiting
in vitro viral replication (EC90 = 0.17 μM). Brain
exposure was observed in mice with 45. Significant protection
was observed in VEEV-infected mice at 5 mg kg–1 day–1 and viral replication appeared to be inhibited through
interference of viral nonstructural proteins.
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Affiliation(s)
- Chad E Schroeder
- University of Kansas Specialized Chemistry Center , Lawrence, Kansas 66049, United States
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24
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Novel indole-2-carboxamide compounds are potent broad-spectrum antivirals active against western equine encephalitis virus in vivo. J Virol 2014; 88:11199-214. [PMID: 25031353 DOI: 10.1128/jvi.01671-14] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Neurotropic alphaviruses, including western, eastern, and Venezuelan equine encephalitis viruses, cause serious and potentially fatal central nervous system infections in humans for which no currently approved therapies exist. We previously identified a series of thieno[3,2-b]pyrrole derivatives as novel inhibitors of neurotropic alphavirus replication, using a cell-based phenotypic assay (W. Peng et al., J. Infect. Dis. 199:950-957, 2009, doi:http://dx.doi.org/10.1086/597275), and subsequently developed second- and third-generation indole-2-carboxamide derivatives with improved potency, solubility, and metabolic stability (J. A. Sindac et al., J. Med. Chem. 55:3535-3545, 2012, doi:http://dx.doi.org/10.1021/jm300214e; J. A. Sindac et al., J. Med. Chem. 56:9222-9241, 2013, http://dx.doi.org/10.1021/jm401330r). In this report, we describe the antiviral activity of the most promising third-generation lead compound, CCG205432, and closely related analogs CCG206381 and CCG209023. These compounds have half-maximal inhibitory concentrations of ∼1 μM and selectivity indices of >100 in cell-based assays using western equine encephalitis virus replicons. Furthermore, CCG205432 retains similar potency against fully infectious virus in cultured human neuronal cells. These compounds show broad inhibitory activity against a range of RNA viruses in culture, including members of the Togaviridae, Bunyaviridae, Picornaviridae, and Paramyxoviridae families. Although their exact molecular target remains unknown, mechanism-of-action studies reveal that these novel indole-based compounds target a host factor that modulates cap-dependent translation. Finally, we demonstrate that both CCG205432 and CCG209023 dampen clinical disease severity and enhance survival of mice given a lethal western equine encephalitis virus challenge. These studies demonstrate that indole-2-carboxamide compounds are viable candidates for continued preclinical development as inhibitors of neurotropic alphaviruses and, potentially, of other RNA viruses. IMPORTANCE There are currently no approved drugs to treat infections with alphaviruses. We previously identified a novel series of compounds with activity against these potentially devastating pathogens (J. A. Sindac et al., J. Med. Chem. 55:3535-3545, 2012, doi:http://dx.doi.org/10.1021/jm300214e; W. Peng et al., J. Infect. Dis. 199:950-957, 2009, doi:http://dx.doi.org/10.1086/597275; J. A. Sindac et al., J. Med. Chem. 56:9222-9241, 2013, http://dx.doi.org/10.1021/jm401330r). We have now produced third-generation compounds with enhanced potency, and this manuscript provides detailed information on the antiviral activity of these advanced-generation compounds, including activity in an animal model. The results of this study represent a notable achievement in the continued development of this novel class of antiviral inhibitors.
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25
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Discovery of potent broad spectrum antivirals derived from marine actinobacteria. PLoS One 2013; 8:e82318. [PMID: 24349254 PMCID: PMC3857800 DOI: 10.1371/journal.pone.0082318] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 10/29/2013] [Indexed: 11/19/2022] Open
Abstract
Natural products provide a vast array of chemical structures to explore in the discovery of new medicines. Although secondary metabolites produced by microbes have been developed to treat a variety of diseases, including bacterial and fungal infections, to date there has been limited investigation of natural products with antiviral activity. In this report, we used a phenotypic cell-based replicon assay coupled with an iterative biochemical fractionation process to identify, purify, and characterize antiviral compounds produced by marine microbes. We isolated a compound from Streptomyces kaviengensis, a novel actinomycetes isolated from marine sediments obtained off the coast of New Ireland, Papua New Guinea, which we identified as antimycin A1a. This compound displays potent activity against western equine encephalitis virus in cultured cells with half-maximal inhibitory concentrations of less than 4 nM and a selectivity index of greater than 550. Our efforts also revealed that several antimycin A analogues display antiviral activity, and mechanism of action studies confirmed that these Streptomyces-derived secondary metabolites function by inhibiting the cellular mitochondrial electron transport chain, thereby suppressing de novo pyrimidine synthesis. Furthermore, we found that antimycin A functions as a broad spectrum agent with activity against a wide range of RNA viruses in cultured cells, including members of the Togaviridae, Flaviviridae, Bunyaviridae, Picornaviridae, and Paramyxoviridae families. Finally, we demonstrate that antimycin A reduces central nervous system viral titers, improves clinical disease severity, and enhances survival in mice given a lethal challenge with western equine encephalitis virus. Our results provide conclusive validation for using natural product resources derived from marine microbes as source material for antiviral drug discovery, and they indicate that host mitochondrial electron transport is a viable target for the continued development of broadly active antiviral compounds.
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26
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Sindac JA, Barraza SJ, Dobry CJ, Xiang J, Blakely PK, Irani DN, Keep RF, Miller DJ, Larsen SD. Optimization of novel indole-2-carboxamide inhibitors of neurotropic alphavirus replication. J Med Chem 2013; 56:9222-41. [PMID: 24151954 DOI: 10.1021/jm401330r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Neurotropic alphaviruses, which include western equine encephalitis virus (WEEV) and Fort Morgan virus, are mosquito-borne pathogens that infect the central nervous system causing acute and potentially fatal encephalitis. We previously reported a novel series of indole-2-carboxamides as alphavirus replication inhibitors, one of which conferred protection against neuroadapted Sindbis virus infection in mice. We describe here further development of this series, resulting in 10-fold improvement in potency in a WEEV replicon assay and up to 40-fold increases in half-lives in mouse liver microsomes. Using a rhodamine123 uptake assay in MDR1-MDCKII cells, we were able to identify structural modifications that markedly reduce recognition by P-glycoprotein, the key efflux transporter at the blood-brain barrier. In a preliminary mouse PK study, we were able to demonstrate that two new analogues could achieve higher and/or longer plasma drug exposures than our previous lead and that one compound achieved measurable drug levels in the brain.
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Affiliation(s)
- Janice A Sindac
- Vahlteich Medicinal Chemistry Core and ‡Department of Medicinal Chemistry, College of Pharmacy, §Departments of Internal Medicine and Microbiology and Immunology, ∥Department of Neurology, ⊥Department of Neurosurgery, University of Michigan , Ann Arbor, Michigan 48109, United States
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27
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Spurgers KB, Hurt CR, Cohen JW, Eccelston LT, Lind CM, Lingappa VR, Glass PJ. Validation of a cell-based ELISA as a screening tool identifying anti-alphavirus small-molecule inhibitors. J Virol Methods 2013; 193:226-31. [DOI: 10.1016/j.jviromet.2013.06.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 05/17/2013] [Accepted: 06/03/2013] [Indexed: 12/29/2022]
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28
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Farmer JR, Altschaefl KM, O'Shea KS, Miller DJ. Activation of the type I interferon pathway is enhanced in response to human neuronal differentiation. PLoS One 2013; 8:e58813. [PMID: 23505563 PMCID: PMC3591356 DOI: 10.1371/journal.pone.0058813] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 02/07/2013] [Indexed: 11/29/2022] Open
Abstract
Despite the crucial role of innate immunity in preventing or controlling pathogen-induced damage in most, if not all, cell types, very little is known about the activity of this essential defense system in central nervous system neurons, especially in humans. In this report we use both an established neuronal cell line model and an embryonic stem cell-based system to examine human neuronal innate immunity and responses to neurotropic alphavirus infection in cultured cells. We demonstrate that neuronal differentiation is associated with increased expression of crucial type I interferon signaling pathway components, including interferon regulatory factor-9 and an interferon receptor heterodimer subunit, which results in enhanced interferon stimulation and subsequent heightened antiviral activity and cytoprotective responses against neurotropic alphaviruses such as western equine encephalitis virus. These results identify important differentiation-dependent changes in innate immune system function that control cell-autonomous neuronal responses. Furthermore, this work demonstrates the utility of human embryonic stem cell-derived cultures as a platform to study the interactions between innate immunity, virus infection, and pathogenesis in central nervous system neurons.
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Affiliation(s)
- Jocelyn R. Farmer
- Departments of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - Kate M. Altschaefl
- Department of Epidemiology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - K. Sue O'Shea
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - David J. Miller
- Departments of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
- * E-mail: .
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29
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Neurotropic arboviruses induce interferon regulatory factor 3-mediated neuronal responses that are cytoprotective, interferon independent, and inhibited by Western equine encephalitis virus capsid. J Virol 2012. [PMID: 23192868 DOI: 10.1128/jvi.02858-12] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cell-intrinsic innate immune responses mediated by the transcription factor interferon regulatory factor 3 (IRF-3) are often vital for early pathogen control, and effective responses in neurons may be crucial to prevent the irreversible loss of these critical central nervous system cells after infection with neurotropic pathogens. To investigate this hypothesis, we used targeted molecular and genetic approaches with cultured neurons to study cell-intrinsic host defense pathways primarily using the neurotropic alphavirus western equine encephalitis virus (WEEV). We found that WEEV activated IRF-3-mediated neuronal innate immune pathways in a replication-dependent manner, and abrogation of IRF-3 function enhanced virus-mediated injury by WEEV and the unrelated flavivirus St. Louis encephalitis virus. Furthermore, IRF-3-dependent neuronal protection from virus-mediated cytopathology occurred independently of autocrine or paracrine type I interferon activity. Despite being partially controlled by IRF-3-dependent signals, WEEV also disrupted antiviral responses by inhibiting pattern recognition receptor pathways. This antagonist activity was mapped to the WEEV capsid gene, which disrupted signal transduction downstream of IRF-3 activation and was independent of capsid-mediated inhibition of host macromolecular synthesis. Overall, these results indicate that innate immune pathways have important cytoprotective activity in neurons and contribute to limiting injury associated with infection by neurotropic arboviruses.
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Jacob RT, Larsen MJ, Larsen SD, Kirchhoff PD, Sherman DH, Neubig RR. MScreen: an integrated compound management and high-throughput screening data storage and analysis system. ACTA ACUST UNITED AC 2012; 17:1080-7. [PMID: 22706349 DOI: 10.1177/1087057112450186] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
High-throughput screening (HTS) has historically been used by the pharmaceutical industry to rapidly test hundreds of thousands of compounds to identify potential drug candidates. More recently, academic groups have used HTS to identify new chemical probes or small interfering RNA (siRNA) that can serve as experimental tools to examine the biology or physiology of novel proteins, processes, or interactions. HTS presents a significant challenge with the vast and complex nature of data generated. This report describes MScreen, a Web-based, open-source cheminformatics application for chemical library and siRNA plate management, primary HTS and dose-response data handling, structure search, and administrative functions. Each project in MScreen can be secured with passwords or shared in an open-information environment that enables collaborators to easily compare data from many screens, providing a useful means to identify compounds with desired selectivity. Unique features include compound, substance, mixture, and siRNA plate creation and formatting; automated dose-response fitting and quality control (QC); and user, target, and assay method administration. MScreen provides an effective means to facilitate HTS information handling and analysis in the academic setting so that users can efficiently view their screening data and evaluate results for follow-up.
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Affiliation(s)
- Renju T Jacob
- Center for Chemical Genomics, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109, USA.
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Sindac JA, Yestrepsky BD, Barraza SJ, Bolduc KL, Blakely PK, Keep RF, Irani DN, Miller DJ, Larsen SD. Novel inhibitors of neurotropic alphavirus replication that improve host survival in a mouse model of acute viral encephalitis. J Med Chem 2012; 55:3535-45. [PMID: 22428985 DOI: 10.1021/jm300214e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Arboviral encephalitis is a potentially devastating human disease with no approved therapies that target virus replication. We previously discovered a novel class of thieno[3,2-b]pyrrole-based inhibitors active against neurotropic alphaviruses such as western equine encephalitis virus (WEEV) in cultured cells. In this report, we describe initial development of these novel antiviral compounds, including bioisosteric replacement of the 4H-thieno[3,2-b]pyrrole core with indole to improve metabolic stability and the introduction of chirality to assess target enantioselectivity. Selected modifications enhanced antiviral activity while maintaining low cytotoxicity, increased stability to microsomal metabolism, and also revealed striking enantiospecific activity in cultured cells. Furthermore, we demonstrate improved outcomes (both symptoms and survival) following treatment with indole analogue 9h (CCG-203926) in an in vivo mouse model of alphaviral encephalitis that closely correlate with the enantiospecific in vitro antiviral activity. These results represent a substantial advancement in the early preclinical development of a promising class of novel antiviral drugs against virulent neurotropic alphaviruses.
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Affiliation(s)
- Janice A Sindac
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109, USA
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Brancatelli G, Bruno G, Nicolò F, Cordaro M, Grassi G, Risitano F, Scala A. X-ray crystallography and computational studies of a variety of pyrrole derivatives obtained from mesoionic oxazoles and selected chromenones. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.01.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Peltier DC, Simms A, Farmer JR, Miller DJ. Human neuronal cells possess functional cytoplasmic and TLR-mediated innate immune pathways influenced by phosphatidylinositol-3 kinase signaling. THE JOURNAL OF IMMUNOLOGY 2010; 184:7010-21. [PMID: 20483728 DOI: 10.4049/jimmunol.0904133] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Innate immune pathways are early defense responses important for the immediate control and eventual clearance of many pathogens, where signaling is initiated via pattern recognition receptor (PRR)-mediated events that occur in a ligand- and cell-type specific manner. Within CNS neurons, innate immune pathways are likely crucial to control pathogens that target these essential yet virtually irreplaceable cells. However, relatively little is known about the induction and regulation of neuronal PRR signaling. In this report, we used human neuronal cell lines and primary rat neuronal cultures to examine PRR expression and function. We found that several innate immune receptor ligands, including Sendai virus, the dsRNA mimetic polyinosinic-polycytidylic acid, and LPS all activated differentiation-dependent neuronal innate immune pathways. Functional genetic analyses revealed that IFN regulatory factor 3-mediated pathways that resulted in IFN-beta transcriptional upregulation were activated in cultured human neuronal cells by the PRRs TLR3, MDA5, or RIG-I in a ligand-specific manner. Furthermore, genome-wide transcriptional array and targeted genetic and pharmacologic analyses identified PI3K signaling as crucial for the induction of innate immune pathways in neurons. These results indicate that human neuronal cells possess specific and functional PRR pathways essential for the effective induction of innate immune responses, and suggest that neurons can play an active role in defense against neurotropic pathogens.
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Affiliation(s)
- Daniel C Peltier
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
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