1
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Karim M, Mishra M, Lo CW, Saul S, Cagirici HB, Tran DHN, Agrawal A, Ghita L, Ojha A, East MP, Gammeltoft KA, Sahoo MK, Johnson GL, Das S, Jochmans D, Cohen CA, Gottwein J, Dye J, Neff N, Pinsky BA, Laitinen T, Pantsar T, Poso A, Zanini F, Jonghe SD, Asquith CRM, Einav S. PIP4K2C inhibition reverses autophagic flux impairment induced by SARS-CoV-2. bioRxiv 2024:2024.04.15.589676. [PMID: 38659941 PMCID: PMC11042293 DOI: 10.1101/2024.04.15.589676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
In search for broad-spectrum antivirals, we discovered a small molecule inhibitor, RMC-113, that potently suppresses the replication of multiple RNA viruses including SARS-CoV-2 in human lung organoids. We demonstrated selective dual inhibition of the lipid kinases PIP4K2C and PIKfyve by RMC-113 and target engagement by its clickable analog. Advanced lipidomics revealed alteration of SARS-CoV-2-induced phosphoinositide signature by RMC-113 and linked its antiviral effect with functional PIP4K2C and PIKfyve inhibition. We discovered PIP4K2C's roles in SARS-CoV-2 entry, RNA replication, and assembly/egress, validating it as a druggable antiviral target. Integrating proteomics, single-cell transcriptomics, and functional assays revealed that PIP4K2C binds SARS-CoV-2 nonstructural protein 6 and regulates virus-induced impairment of autophagic flux. Reversing this autophagic flux impairment is a mechanism of antiviral action of RMC-113. These findings reveal virus-induced autophagy regulation via PIP4K2C, an understudied kinase, and propose dual inhibition of PIP4K2C and PIKfyve as a candidate strategy to combat emerging viruses.
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Affiliation(s)
- Marwah Karim
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Manjari Mishra
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Chieh-Wen Lo
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Halise Busra Cagirici
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Do Hoang Nhu Tran
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Aditi Agrawal
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Luca Ghita
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Amrita Ojha
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Michael P East
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Karen Anbro Gammeltoft
- Department of Infectious Diseases, University of Copenhagen, Denmark. Copenhagen Hepatitis C Program (CO-HEP), Department of Infectious Diseases, Copenhagen
- University Hospital-Hvidovre, Hvidovre, Denmark
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Malaya Kumar Sahoo
- Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
| | - Gary L Johnson
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Soumita Das
- Biomedical & Nutritional Science, Center for Pathogen Research & Training (CPRT), University of Massachusetts-Lowell, USA
| | - Dirk Jochmans
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Courtney A Cohen
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Frederick, Maryland, USA
| | - Judith Gottwein
- Department of Infectious Diseases, University of Copenhagen, Denmark. Copenhagen Hepatitis C Program (CO-HEP), Department of Infectious Diseases, Copenhagen
- University Hospital-Hvidovre, Hvidovre, Denmark
- Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - John Dye
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Frederick, Maryland, USA
| | - Norma Neff
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
| | - Benjamin A Pinsky
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
- Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
| | - Tuomo Laitinen
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Finland
| | - Tatu Pantsar
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Finland
| | - Antti Poso
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Finland
| | - Fabio Zanini
- School of Clinical Medicine, UNSW Sydney, Sydney, New South Wales, Australia
- Cellular Genomics Futures Institute, UNSW Sydney, Sydney, New South Wales, Australia
- Evolution and Ecology Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Steven De Jonghe
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | | | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
- Department of Microbiology and Immunology, Stanford University, CA, USA
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2
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Saul S, Karim M, Ghita L, Huang PT, Chiu W, Durán V, Lo CW, Kumar S, Bhalla N, Leyssen P, Alem F, Boghdeh NA, Tran DH, Cohen CA, Brown JA, Huie KE, Tindle C, Sibai M, Ye C, Khalil AM, Chiem K, Martinez-Sobrido L, Dye JM, Pinsky BA, Ghosh P, Das S, Solow-Cordero DE, Jin J, Wikswo JP, Jochmans D, Neyts J, De Jonghe S, Narayanan A, Einav S. Anticancer pan-ErbB inhibitors reduce inflammation and tissue injury and exert broad-spectrum antiviral effects. J Clin Invest 2023; 133:e169510. [PMID: 37581931 PMCID: PMC10541190 DOI: 10.1172/jci169510] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 08/10/2023] [Indexed: 08/17/2023] Open
Abstract
Targeting host factors exploited by multiple viruses could offer broad-spectrum solutions for pandemic preparedness. Seventeen candidates targeting diverse functions emerged in a screen of 4,413 compounds for SARS-CoV-2 inhibitors. We demonstrated that lapatinib and other approved inhibitors of the ErbB family of receptor tyrosine kinases suppress replication of SARS-CoV-2, Venezuelan equine encephalitis virus (VEEV), and other emerging viruses with a high barrier to resistance. Lapatinib suppressed SARS-CoV-2 entry and later stages of the viral life cycle and showed synergistic effect with the direct-acting antiviral nirmatrelvir. We discovered that ErbB1, ErbB2, and ErbB4 bind SARS-CoV-2 S1 protein and regulate viral and ACE2 internalization, and they are required for VEEV infection. In human lung organoids, lapatinib protected from SARS-CoV-2-induced activation of ErbB-regulated pathways implicated in non-infectious lung injury, proinflammatory cytokine production, and epithelial barrier injury. Lapatinib suppressed VEEV replication, cytokine production, and disruption of blood-brain barrier integrity in microfluidics-based human neurovascular units, and reduced mortality in a lethal infection murine model. We validated lapatinib-mediated inhibition of ErbB activity as an important mechanism of antiviral action. These findings reveal regulation of viral replication, inflammation, and tissue injury via ErbBs and establish a proof of principle for a repurposed, ErbB-targeted approach to combat emerging viruses.
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Affiliation(s)
- Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Marwah Karim
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Luca Ghita
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Pei-Tzu Huang
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Winston Chiu
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Verónica Durán
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
- Chan Zuckerberg Biohub, San Francisco, California, USA
| | - Chieh-Wen Lo
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Sathish Kumar
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Nishank Bhalla
- National Center for Biodefense and Infectious Disease, Biomedical Research Laboratory, and
| | - Pieter Leyssen
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Farhang Alem
- Institute for Biohealth Innovation, George Mason University, Manassas, Virginia, USA
| | - Niloufar A. Boghdeh
- Institute for Biohealth Innovation, George Mason University, Manassas, Virginia, USA
| | - Do H.N. Tran
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
| | - Courtney A. Cohen
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Frederick, Maryland, USA
| | - Jacquelyn A. Brown
- Department of Physics and Astronomy, Vanderbilt Institute for Integrative Biosystems Research and Education, Vanderbilt University, Nashville, Tennessee, USA
| | - Kathleen E. Huie
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Frederick, Maryland, USA
| | - Courtney Tindle
- Department of Cellular and Molecular Medicine and
- HUMANOID Center of Research Excellence, UCSD, San Diego, California, USA
| | - Mamdouh Sibai
- Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
| | - Chengjin Ye
- Disease Prevention and Intervention, Texas Biomedical Research Institute, San Antonio, Texas, USA
| | - Ahmed Magdy Khalil
- Disease Prevention and Intervention, Texas Biomedical Research Institute, San Antonio, Texas, USA
| | - Kevin Chiem
- Disease Prevention and Intervention, Texas Biomedical Research Institute, San Antonio, Texas, USA
| | - Luis Martinez-Sobrido
- Disease Prevention and Intervention, Texas Biomedical Research Institute, San Antonio, Texas, USA
| | - John M. Dye
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Frederick, Maryland, USA
| | - Benjamin A. Pinsky
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
- Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
| | - Pradipta Ghosh
- Department of Cellular and Molecular Medicine and
- HUMANOID Center of Research Excellence, UCSD, San Diego, California, USA
- Department of Medicine and
| | - Soumita Das
- HUMANOID Center of Research Excellence, UCSD, San Diego, California, USA
- Department of Pathology, UCSD, San Diego, California, USA
| | | | - Jing Jin
- Vitalant Research Institute, San Francisco, California, USA
| | - John P. Wikswo
- Department of Biomedical Engineering, Department of Molecular Physiology and Biophysics, and Department of Physics and Astronomy, Vanderbilt Institute for Integrative Biosystems Research and Education, Vanderbilt University, Nashville, Tennessee, USA
| | - Dirk Jochmans
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Johan Neyts
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Steven De Jonghe
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Aarthi Narayanan
- National Center for Biodefense and Infectious Disease, Biomedical Research Laboratory, and
- School of Systems Biology, George Mason University, Manassas, Virginia, USA
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
- Chan Zuckerberg Biohub, San Francisco, California, USA
- Department of Microbiology and Immunology, Stanford University, Stanford, California, USA
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3
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Saul S, Karim M, Ghita L, Huang PT, Chiu W, Durán V, Lo CW, Kumar S, Bhalla N, Leyssen P, Alem F, Boghdeh NA, Tran DH, Cohen CA, Brown JA, Huie KE, Tindle C, Sibai M, Ye C, Khalil AM, Martinez-Sobrido L, Dye JM, Pinsky BA, Ghosh P, Das S, Solow-Cordero DE, Jin J, Wikswo JP, Jochmans D, Neyts J, Jonghe SD, Narayanan A, Einav S. Anticancer pan-ErbB inhibitors reduce inflammation and tissue injury and exert broad-spectrum antiviral effects. bioRxiv 2023:2021.05.15.444128. [PMID: 34159337 PMCID: PMC8219101 DOI: 10.1101/2021.05.15.444128] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
Targeting host factors exploited by multiple viruses could offer broad-spectrum solutions for pandemic preparedness. Seventeen candidates targeting diverse functions emerged in a screen of 4,413 compounds for SARS-CoV-2 inhibitors. We demonstrated that lapatinib and other approved inhibitors of the ErbB family receptor tyrosine kinases suppress replication of SARS-CoV-2, Venezuelan equine encephalitis virus (VEEV), and other emerging viruses with a high barrier to resistance. Lapatinib suppressed SARS-CoV-2 entry and later stages of the viral life cycle and showed synergistic effect with the direct-acting antiviral nirmatrelvir. We discovered that ErbB1, 2 and 4 bind SARS-CoV-2 S1 protein and regulate viral and ACE2 internalization, and they are required for VEEV infection. In human lung organoids, lapatinib protected from SARS-CoV-2-induced activation of ErbB-regulated pathways implicated in non-infectious lung injury, pro-inflammatory cytokine production, and epithelial barrier injury. Lapatinib suppressed VEEV replication, cytokine production and disruption of the blood-brain barrier integrity in microfluidic-based human neurovascular units, and reduced mortality in a lethal infection murine model. We validated lapatinib-mediated inhibition of ErbB activity as an important mechanism of antiviral action. These findings reveal regulation of viral replication, inflammation, and tissue injury via ErbBs and establish a proof-of-principle for a repurposed, ErbB-targeted approach to combat emerging viruses.
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4
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Martinez-Gualda B, Graus M, Camps A, Vanhulle E, Saul S, Azari S, Nhu Tran DH, Vangeel L, Chiu W, Neyts J, Schols D, Einav S, Vermeire K, De Jonghe S. Synthesis and evaluation of 3-alkynyl-5-aryl-7-aza-indoles as broad-spectrum antiviral agents. Front Chem 2022; 10:1058229. [PMID: 36385995 PMCID: PMC9643853 DOI: 10.3389/fchem.2022.1058229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 10/17/2022] [Indexed: 11/13/2022] Open
Abstract
RNA viral infections, including those caused by respiratory syncytial virus (RSV), severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and Venezuelan Equine encephalitis virus (VEEV), pose a major global health challenge. Here, we report the synthesis and screening of a series of pyrrolo[2,3-b]pyridines targeting RSV, SARS-CoV-2 and/or VEEV. From this campaign, a series of lead compounds was generated that demonstrated antiviral activity in the low single-digit micromolar range against the various viruses and did not show cytotoxicity. These findings highlight the potential of 3-alkynyl-5-aryl-7-aza-indoles as a promising chemotype for the development of broad-spectrum antiviral agents.
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5
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Karim M, Saul S, Ghita L, Sahoo MK, Ye C, Bhalla N, Lo CW, Jin J, Park JG, Martinez-Gualda B, East MP, Johnson GL, Pinsky BA, Martinez-Sobrido L, Asquith CRM, Narayanan A, De Jonghe S, Einav S. Numb-associated kinases are required for SARS-CoV-2 infection and are cellular targets for antiviral strategies. Antiviral Res 2022; 204:105367. [PMID: 35738348 PMCID: PMC9212491 DOI: 10.1016/j.antiviral.2022.105367] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/08/2022] [Accepted: 06/15/2022] [Indexed: 12/02/2022]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to pose serious threats to global health. We previously reported that AAK1, BIKE and GAK, members of the Numb-associated kinase family, control intracellular trafficking of multiple RNA viruses during viral entry and assembly/egress. Here, using both genetic and pharmacological approaches, we probe the functional relevance of NAKs for SARS-CoV-2 infection. siRNA-mediated depletion of AAK1, BIKE, GAK, and STK16, the fourth member of the NAK family, suppressed SARS-CoV-2 infection in human lung epithelial cells. Both known and novel small molecules with potent AAK1/BIKE, GAK or STK16 activity suppressed SARS-CoV-2 infection. Moreover, combination treatment with the approved anti-cancer drugs, sunitinib and erlotinib, with potent anti-AAK1/BIKE and GAK activity, respectively, demonstrated synergistic effect against SARS-CoV-2 infection in vitro. Time-of-addition experiments revealed that pharmacological inhibition of AAK1 and BIKE suppressed viral entry as well as late stages of the SARS-CoV-2 life cycle. Lastly, suppression of NAKs expression by siRNAs inhibited entry of both wild type and SARS-CoV-2 pseudovirus. These findings provide insight into the roles of NAKs in SARS-CoV-2 infection and establish a proof-of-principle that pharmacological inhibition of NAKs can be potentially used as a host-targeted approach to treat SARS-CoV-2 with potential implications to other coronaviruses.
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Affiliation(s)
- Marwah Karim
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA
| | - Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA
| | - Luca Ghita
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA
| | - Malaya Kumar Sahoo
- Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
| | - Chengjin Ye
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Nishank Bhalla
- National Center for Biodefence and Infectious Disease, Biomedical Research Laboratory, School of Systems Biology, George Mason University, Manassas, VA, USA
| | - Chieh-Wen Lo
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA
| | - Jing Jin
- Vitalant Research Institute, San Francisco, CA, USA
| | - Jun-Gyu Park
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Belén Martinez-Gualda
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Michael Patrick East
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Gary L Johnson
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA; Lineberger Comprehensive Cancer Center, School of Medicine, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Benjamin A Pinsky
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA; Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
| | | | - Christopher R M Asquith
- Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA; School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, 70211, Finland
| | - Aarthi Narayanan
- National Center for Biodefence and Infectious Disease, Biomedical Research Laboratory, School of Systems Biology, George Mason University, Manassas, VA, USA
| | - Steven De Jonghe
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Leuven, Belgium
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, CA, USA; Department of Microbiology and Immunology, Stanford University, CA, USA; Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA.
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Schor S, Pu S, Nicolaescu V, Azari S, Kõivomägi M, Karim M, Cassonnet P, Saul S, Neveu G, Yueh A, Demeret C, Skotheim JM, Jacob Y, Randall G, Einav S. The cargo adapter protein CLINT1 is phosphorylated by the Numb-associated kinase BIKE and mediates dengue virus infection. J Biol Chem 2022; 298:101956. [PMID: 35452674 PMCID: PMC9133654 DOI: 10.1016/j.jbc.2022.101956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 03/22/2022] [Accepted: 03/24/2022] [Indexed: 11/25/2022] Open
Abstract
The signaling pathways and cellular functions regulated by the four Numb-associated kinases are largely unknown. We reported that AAK1 and GAK control intracellular trafficking of RNA viruses and revealed a requirement for BIKE in early and late stages of dengue virus (DENV) infection. However, the downstream targets phosphorylated by BIKE have not yet been identified. Here, to identify BIKE substrates, we conducted a barcode fusion genetics-yeast two-hybrid screen and retrieved publicly available data generated via affinity-purification mass spectrometry. We subsequently validated 19 of 47 putative BIKE interactors using mammalian cell-based protein-protein interaction assays. We found that CLINT1, a cargo-specific adapter implicated in bidirectional Golgi-to-endosome trafficking, emerged as a predominant hit in both screens. Our experiments indicated that BIKE catalyzes phosphorylation of a threonine 294 CLINT1 residue both in vitro and in cell culture. Our findings revealed that CLINT1 phosphorylation mediates its binding to the DENV nonstructural 3 protein and subsequently promotes DENV assembly and egress. Additionally, using live-cell imaging we revealed that CLINT1 cotraffics with DENV particles and is involved in mediating BIKE's role in DENV infection. Finally, our data suggest that additional cellular BIKE interactors implicated in the host immune and stress responses and the ubiquitin proteasome system might also be candidate phosphorylation substrates of BIKE. In conclusion, these findings reveal cellular substrates and pathways regulated by the understudied Numb-associated kinase enzyme BIKE, a mechanism for CLINT1 regulation, and control of DENV infection via BIKE signaling, with potential implications for cell biology, virology, and host-targeted antiviral design.
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Affiliation(s)
- Stanford Schor
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | - Szuyuan Pu
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | - Vlad Nicolaescu
- Department of Microbiology, University of Chicago, Chicago, Illinois, USA
| | - Siavash Azari
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | | | - Marwah Karim
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | - Patricia Cassonnet
- Department of Virology, Molecular Genetics of RNA Virus Genetics (GMVR), Pasteur Institute, National Center for Scientific Research, and Paris Diderot University, Paris, France
| | - Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | - Gregory Neveu
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA
| | - Andrew Yueh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Zhunan, Taiwan
| | - Caroline Demeret
- Department of Virology, Molecular Genetics of RNA Virus Genetics (GMVR), Pasteur Institute, National Center for Scientific Research, and Paris Diderot University, Paris, France
| | - Jan M Skotheim
- Department of Biology, Stanford University, California, USA
| | - Yves Jacob
- Department of Virology, Molecular Genetics of RNA Virus Genetics (GMVR), Pasteur Institute, National Center for Scientific Research, and Paris Diderot University, Paris, France
| | - Glenn Randall
- Department of Microbiology, University of Chicago, Chicago, Illinois, USA
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University, California, USA; Chan Zuckerberg Biohub, San Francisco, California, USA.
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7
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Liu YE, Saul S, Rao AM, Robinson ML, Agudelo Rojas OL, Sanz AM, Verghese M, Solis D, Sibai M, Huang CH, Sahoo MK, Gelvez RM, Bueno N, Estupiñan Cardenas MI, Villar Centeno LA, Rojas Garrido EM, Rosso F, Donato M, Pinsky BA, Einav S, Khatri P. An 8-gene machine learning model improves clinical prediction of severe dengue progression. Genome Med 2022; 14:33. [PMID: 35346346 PMCID: PMC8959795 DOI: 10.1186/s13073-022-01034-w] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 02/24/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Each year 3-6 million people develop life-threatening severe dengue (SD). Clinical warning signs for SD manifest late in the disease course and are nonspecific, leading to missed cases and excess hospital burden. Better SD prognostics are urgently needed. METHODS We integrated 11 public datasets profiling the blood transcriptome of 365 dengue patients of all ages and from seven countries, encompassing biological, clinical, and technical heterogeneity. We performed an iterative multi-cohort analysis to identify differentially expressed genes (DEGs) between non-severe patients and SD progressors. Using only these DEGs, we trained an XGBoost machine learning model on public data to predict progression to SD. All model parameters were "locked" prior to validation in an independent, prospectively enrolled cohort of 377 dengue patients in Colombia. We measured expression of the DEGs in whole blood samples collected upon presentation, prior to SD progression. We then compared the accuracy of the locked XGBoost model and clinical warning signs in predicting SD. RESULTS We identified eight SD-associated DEGs in the public datasets and built an 8-gene XGBoost model that accurately predicted SD progression in the independent validation cohort with 86.4% (95% CI 68.2-100) sensitivity and 79.7% (95% CI 75.5-83.9) specificity. Given the 5.8% proportion of SD cases in this cohort, the 8-gene model had a positive and negative predictive value (PPV and NPV) of 20.9% (95% CI 16.7-25.6) and 99.0% (95% CI 97.7-100.0), respectively. Compared to clinical warning signs at presentation, which had 77.3% (95% CI 58.3-94.1) sensitivity and 39.7% (95% CI 34.7-44.9) specificity, the 8-gene model led to an 80% reduction in the number needed to predict (NNP) from 25.4 to 5.0. Importantly, the 8-gene model accurately predicted subsequent SD in the first three days post-fever onset and up to three days prior to SD progression. CONCLUSIONS The 8-gene XGBoost model, trained on heterogeneous public datasets, accurately predicted progression to SD in a large, independent, prospective cohort, including during the early febrile stage when SD prediction remains clinically difficult. The model has potential to be translated to a point-of-care prognostic assay to reduce dengue morbidity and mortality without overwhelming limited healthcare resources.
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Affiliation(s)
- Yiran E. Liu
- grid.168010.e0000000419368956Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Cancer Biology Graduate Program, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Division of Infectious Diseases and Geographic Medicine, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA
| | - Sirle Saul
- grid.168010.e0000000419368956Division of Infectious Diseases and Geographic Medicine, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA
| | - Aditya Manohar Rao
- grid.168010.e0000000419368956Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Immunology Graduate Program, School of Medicine, Stanford University, CA Stanford, USA
| | - Makeda Lucretia Robinson
- grid.168010.e0000000419368956Division of Infectious Diseases and Geographic Medicine, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | | | - Ana Maria Sanz
- grid.477264.4Clinical Research Center, Fundación Valle del Lili, Cali, Colombia
| | - Michelle Verghese
- grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Daniel Solis
- grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Mamdouh Sibai
- grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Chun Hong Huang
- grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Malaya Kumar Sahoo
- grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Rosa Margarita Gelvez
- Centro de Atención y Diagnóstico de Enfermedades Infecciosas (CDI), Bucaramanga, Colombia
| | - Nathalia Bueno
- Centro de Atención y Diagnóstico de Enfermedades Infecciosas (CDI), Bucaramanga, Colombia
| | | | | | | | - Fernando Rosso
- grid.477264.4Clinical Research Center, Fundación Valle del Lili, Cali, Colombia ,grid.477264.4Division of Infectious Diseases, Department of Internal Medicine, Fundación Valle del Lili, Cali, Colombia
| | - Michele Donato
- grid.168010.e0000000419368956Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Center for Biomedical Informatics Research, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA
| | - Benjamin A. Pinsky
- grid.168010.e0000000419368956Division of Infectious Diseases and Geographic Medicine, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Department of Pathology, School of Medicine, Stanford University, CA Stanford, USA
| | - Shirit Einav
- grid.168010.e0000000419368956Division of Infectious Diseases and Geographic Medicine, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Department of Microbiology and Immunology, School of Medicine, Stanford University, CA Stanford, USA
| | - Purvesh Khatri
- grid.168010.e0000000419368956Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, CA Stanford, USA ,grid.168010.e0000000419368956Center for Biomedical Informatics Research, Department of Medicine, School of Medicine, Stanford University, CA Stanford, USA
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8
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Martinez-Gualda B, Saul S, Froeyen M, Schols D, Herdewijn P, Einav S, De Jonghe S. Discovery of 3-phenyl- and 3-N-piperidinyl-isothiazolo[4,3-b]pyridines as highly potent inhibitors of cyclin G-associated kinase. Eur J Med Chem 2021; 213:113158. [PMID: 33497888 DOI: 10.1016/j.ejmech.2021.113158] [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: 10/22/2020] [Revised: 01/02/2021] [Accepted: 01/03/2021] [Indexed: 01/26/2023]
Abstract
Structural modifications at position 3 of the isothiazolo[4,3-b]pyridine scaffold afforded a new series of cyclin G-associated kinase (GAK) inhibitors. It was shown that the insertion of a carboxamide residue at position 3 of a phenyl or piperidinyl moiety generated potent GAK inhibitors with IC50 values in a low nanomolar range. This potent GAK binding affinity was rationalized by molecular modelling demonstrating that the carboxamide moiety engages in an extra hydrogen bond with GAK. Moreover, this new series of compounds was also endowed with antiviral activity against dengue virus, highlighting the potential utility of GAK as a target for the development of antiviral drugs.
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Affiliation(s)
- Belén Martinez-Gualda
- KU Leuven, Rega Institute for Medical Research, Laboratory of Medicinal Chemistry, Herestraat 49, 3000, Leuven, Belgium
| | - Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Mathy Froeyen
- KU Leuven, Rega Institute for Medical Research, Laboratory of Medicinal Chemistry, Herestraat 49, 3000, Leuven, Belgium
| | - Dominique Schols
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Herestraat 49, 3000, Leuven, Belgium
| | - Piet Herdewijn
- KU Leuven, Rega Institute for Medical Research, Laboratory of Medicinal Chemistry, Herestraat 49, 3000, Leuven, Belgium
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Steven De Jonghe
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, Herestraat 49, 3000, Leuven, Belgium.
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9
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Pu S, Schor S, Karim M, Saul S, Robinson M, Kumar S, Prugar LI, Dorosky DE, Brannan J, Dye JM, Einav S. BIKE regulates dengue virus infection and is a cellular target for broad-spectrum antivirals. Antiviral Res 2020; 184:104966. [PMID: 33137362 DOI: 10.1016/j.antiviral.2020.104966] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 06/09/2020] [Revised: 10/07/2020] [Accepted: 10/26/2020] [Indexed: 12/15/2022]
Abstract
Global health is threatened by emerging viruses, many of which lack approved therapies and effective vaccines, including dengue, Ebola, and Venezuelan equine encephalitis. We previously reported that AAK1 and GAK, two of the four members of the understudied Numb-associated kinases (NAK) family, control intracellular trafficking of RNA viruses. Nevertheless, the role of BIKE and STK16 in viral infection remained unknown. Here, we reveal a requirement for BIKE, but not STK-16, in dengue virus (DENV) infection. BIKE mediates both early (postinternalization) and late (assembly/egress) stages in the DENV life cycle, and this effect is mediated in part by phosphorylation of a threonine 156 (T156) residue in the μ subunit of the adaptor protein (AP) 2 complex. Pharmacological compounds with potent anti-BIKE activity, including the investigational anticancer drug 5Z-7-oxozeaenol and more selective inhibitors, suppress DENV infection both in vitro and ex vivo. BIKE overexpression reverses the antiviral activity, validating that the mechanism of antiviral action is, at least in part, mediated by BIKE. Lastly, 5Z-7-oxozeaenol exhibits antiviral activity against viruses from three unrelated RNA viral families with a high genetic barrier to resistance. These findings reveal regulation of poorly understood stages of the DENV life cycle via BIKE signaling and establish a proof-of-principle that pharmacological inhibition of BIKE can be potentially used as a broad-spectrum strategy against acute emerging viral infections.
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Affiliation(s)
- Szuyuan Pu
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Stanford Schor
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Marwah Karim
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Makeda Robinson
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Sathish Kumar
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA
| | - Laura I Prugar
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Fort Detrick, Maryland, USA
| | - Danielle E Dorosky
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Fort Detrick, Maryland, USA
| | - Jennifer Brannan
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Fort Detrick, Maryland, USA
| | - John M Dye
- US Army Medical Research Institute of Infectious Diseases, Viral Immunology Branch, Fort Detrick, Maryland, USA
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Department of Microbiology and Immunology, Stanford University, CA, USA.
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10
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Abstract
There is a large global unmet need for effective countermeasures to combat severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of coronavirus disease 2019 (COVID-19). The development of novel antiviral drugs is expensive and too slow to meet the immediate need. The repurposing of drugs that are approved or are under advanced clinical investigation provides a cost- and time-effective therapeutic solution. This review summarizes the major repurposed approaches that have been proposed or are already being studied in clinical trials for COVID-19. Among these approaches are drugs that aim to reduce SARS-CoV-2 replication by targeting either viral enzymatic functions or cellular factors required for the viral life cycle. Drugs that modulate the host immune response to SARS-CoV-2 infection by boosting it to enhance viral clearance or by suppressing it to prevent excessive inflammation and tissue injury represent another category. Lastly, we discuss means to discover repurposed drugs and the ongoing challenges associated with the off-label use of existing drugs in the context of the COVID-19 outbreak.
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Affiliation(s)
- Sirle Saul
- Department of Medicine, Division of Infectious Diseases and
Geographic Medicine, and Department of Microbiology and Immunology,
Stanford University School of Medicine, Stanford
University, 300 Pasteur Drive, Lane Building, Rm
L127, Stanford, California 94305, United
States
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and
Geographic Medicine, and Department of Microbiology and Immunology,
Stanford University School of Medicine, Stanford
University, 300 Pasteur Drive, Lane Building, Rm
L127, Stanford, California 94305, United
States
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11
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Saul S, Pu SY, Zuercher WJ, Einav S, Asquith CRM. Potent antiviral activity of novel multi-substituted 4-anilinoquin(az)olines. Bioorg Med Chem Lett 2020; 30:127284. [PMID: 32631507 DOI: 10.1016/j.bmcl.2020.127284] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [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: 05/01/2020] [Revised: 05/19/2020] [Accepted: 05/20/2020] [Indexed: 12/31/2022]
Abstract
Screening a series of 4-anilinoquinolines and 4-anilinoquinazolines enabled identification of potent novel inhibitors of dengue virus (DENV). Preparation of focused 4-anilinoquinoline/quinazoline scaffold arrays led to the identification of a series of high potency 6-substituted bromine and iodine derivatives. The most potent compound 6-iodo-4-((3,4,5-trimethoxyphenyl)amino)quinoline-3-carbonitrile (47) inhibited DENV infection with an EC50 = 79 nM. Crucially, these compounds showed very limited toxicity with CC50 values >10 µM in almost all cases. This new promising series provides an anchor point for further development to optimize compound properties.
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Affiliation(s)
- Sirle Saul
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Szu-Yuan Pu
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - William J Zuercher
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Shirit Einav
- Department of Medicine, Division of Infectious Diseases and Geographic Medicine, and Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.
| | - Christopher R M Asquith
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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12
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Lulla V, Karo-Astover L, Rausalu K, Saul S, Merits A, Lulla A. Timeliness of Proteolytic Events Is Prerequisite for Efficient Functioning of the Alphaviral Replicase. J Virol 2018; 92:e00151-18. [PMID: 29695431 PMCID: PMC6026757 DOI: 10.1128/jvi.00151-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 04/16/2018] [Indexed: 11/20/2022] Open
Abstract
Polyprotein processing has an important regulatory role in the life cycle of positive-strand RNA viruses. In the case of alphaviruses, sequential cleavage of the nonstructural polyprotein (ns-polyprotein) at three sites eventually yields four mature nonstructural proteins (nsPs) that continue working in complex to replicate viral genomic RNA and transcribe subgenomic RNA. Recognition of cleavage sites by viral nsP2 protease is guided by short sequences upstream of the scissile bond and, more importantly, by the spatial organization of the replication complex. In this study, we analyzed the consequences of the artificially accelerated processing of the Semliki Forest virus ns-polyprotein. It was found that in mammalian cells, not only the order but also the correct timing of the cleavage events is essential for the success of viral replication. Analysis of the effects of compensatory mutations in rescued viruses as well as in vitro translation and trans-replicase assays corroborated our findings and revealed the importance of the V515 residue in nsP2 for recognizing the P4 position in the nsP1/nsP2 cleavage site. We also extended our conclusions to Sindbis virus by analyzing the properties of the hyperprocessive variant carrying the N614D mutation in nsP2. We conclude that the sequence of the nsP1/nsP2 site in alphaviruses is under selective pressure to avoid the presence of sequences that are recognized too efficiently and would otherwise lead to premature cleavage at this site before completion of essential tasks of RNA synthesis or virus-induced replication complex formation. Even subtle changes in the ns-polyprotein processing pattern appear to lead to virus attenuation.IMPORTANCE The polyprotein expression strategy is a cornerstone of alphavirus replication. Three sites within the ns-polyprotein are recognized by the viral nsP2 protease and cleaved in a defined order. Specific substrate targeting is achieved by the recognition of the short sequence upstream of the scissile bond and a correct macromolecular assembly of ns-polyprotein. Here, we highlighted the importance of the timeliness of proteolytic events, as an additional layer of regulation of efficient virus replication. We conclude that, somewhat counterintuitively, the cleavage site sequences at the nsP1/nsP2 and nsP2/nsP3 junctions are evolutionarily selected to be recognized by protease inefficiently, to avoid premature cleavages that would be detrimental for the assembly and functionality of the replication complex. Understanding the causes and consequences of viral polyprotein processing events is important for predicting the properties of mutant viruses and should be helpful for the development of better vaccine candidates and understanding potential mechanisms of resistance to protease inhibitors.
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Affiliation(s)
- Valeria Lulla
- Institute of Technology, University of Tartu, Tartu, Estonia
| | | | - Kai Rausalu
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Sirle Saul
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Aleksei Lulla
- Institute of Technology, University of Tartu, Tartu, Estonia
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13
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Mutso M, Morro AM, Smedberg C, Kasvandik S, Aquilimeba M, Teppor M, Tarve L, Lulla A, Lulla V, Saul S, Thaa B, McInerney GM, Merits A, Varjak M. Mutation of CD2AP and SH3KBP1 Binding Motif in Alphavirus nsP3 Hypervariable Domain Results in Attenuated Virus. Viruses 2018; 10:E226. [PMID: 29702546 PMCID: PMC5977219 DOI: 10.3390/v10050226] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 04/17/2018] [Accepted: 04/20/2018] [Indexed: 12/28/2022] Open
Abstract
Infection by Chikungunya virus (CHIKV) of the Old World alphaviruses (family Togaviridae) in humans can cause arthritis and arthralgia. The virus encodes four non-structural proteins (nsP) (nsP1, nsp2, nsP3 and nsP4) that act as subunits of the virus replicase. These proteins also interact with numerous host proteins and some crucial interactions are mediated by the unstructured C-terminal hypervariable domain (HVD) of nsP3. In this study, a human cell line expressing EGFP tagged with CHIKV nsP3 HVD was established. Using quantitative proteomics, it was found that CHIKV nsP3 HVD can bind cytoskeletal proteins, including CD2AP, SH3KBP1, CAPZA1, CAPZA2 and CAPZB. The interaction with CD2AP was found to be most evident; its binding site was mapped to the second SH3 ligand-like element in nsP3 HVD. Further assessment indicated that CD2AP can bind to nsP3 HVDs of many different New and Old World alphaviruses. Mutation of the short binding element hampered the ability of the virus to establish infection. The mutation also abolished ability of CD2AP to co-localise with nsP3 and replication complexes of CHIKV; the same was observed for Semliki Forest virus (SFV) harbouring a similar mutation. Similar to CD2AP, its homolog SH3KBP1 also bound the identified motif in CHIKV and SFV nsP3.
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Affiliation(s)
- Margit Mutso
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Ainhoa Moliner Morro
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden.
| | - Cecilia Smedberg
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden.
| | - Sergo Kasvandik
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | | | - Mona Teppor
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Liisi Tarve
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Aleksei Lulla
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Valeria Lulla
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Sirle Saul
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Bastian Thaa
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden.
| | - Gerald M McInerney
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-171 77 Stockholm, Sweden.
| | - Andres Merits
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
| | - Margus Varjak
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
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14
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Mutso M, Saul S, Rausalu K, Susova O, Žusinaite E, Mahalingam S, Merits A. Reverse genetic system, genetically stable reporter viruses and packaged subgenomic replicon based on a Brazilian Zika virus isolate. J Gen Virol 2017; 98:2712-2724. [PMID: 29022864 DOI: 10.1099/jgv.0.000938] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Zika virus (ZIKV, genus Flavivirus) has emerged as a major mosquito-transmitted human pathogen, with recent outbreaks associated with an increased incidence of neurological complications, particularly microcephaly and the Guillain-Barré syndrome. Because the virus has only very recently emerged as an important pathogen, research is being hampered by a lack of reliable molecular tools. Here we report an infectious cDNA (icDNA) clone for ZIKV isolate BeH819015 from Brazil, which was selected as representative of South American ZIKV isolated at early stages of the outbreak. icDNA clones were assembled from synthetic DNA fragments corresponding to the consensus sequence of the BeH819015 isolate. Virus rescued from the icDNA clone had properties identical to a natural ZIKV isolate from South America. Variants of the clone-derived virus, expressing nanoluciferase, enhanced green fluorescent or mCherry marker proteins in both mammalian and insect cells and being genetically stable for multiple in vitro passages, were obtained. A ZIKV subgenomic replicon, lacking a prM- and E glycoprotein encoding region and expressing a Gaussia luciferase marker, was constructed and shown to replicate both in mammalian and insect cells. In the presence of the Semliki Forest virus replicon, expressing ZIKV structural proteins, the ZIKV replicon was packaged into virus-replicon particles. Efficient reverse genetic systems, genetically stable marker viruses and packaged replicons offer significant improvements for biological studies of ZIKV infection and disease, as well as for the development of antiviral approaches.
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Affiliation(s)
- Margit Mutso
- Institute of Technology, University of Tartu, Tartu, Estonia.,Institute for Glycomics, Griffith University, Gold Coast Campus, Southport, 4222, Queensland, Australia
| | - Sirle Saul
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Kai Rausalu
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Olga Susova
- Blokhin Russian Cancer Research Center, Ministry of Health of the Russian Federation, Moscow, 115487, Russia
| | - Eva Žusinaite
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Suresh Mahalingam
- Institute for Glycomics, Griffith University, Gold Coast Campus, Southport, 4222, Queensland, Australia
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
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15
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Ramachandran M, Yu D, Dyczynski M, Baskaran S, Zhang L, Lulla A, Lulla V, Saul S, Nelander S, Dimberg A, Merits A, Leja-Jarblad J, Essand M. Safe and Effective Treatment of Experimental Neuroblastoma and Glioblastoma Using Systemically Delivered Triple MicroRNA-Detargeted Oncolytic Semliki Forest Virus. Clin Cancer Res 2016; 23:1519-1530. [PMID: 27637889 DOI: 10.1158/1078-0432.ccr-16-0925] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 08/10/2016] [Accepted: 08/31/2016] [Indexed: 11/16/2022]
Abstract
Background: Glioblastoma multiforme and high-risk neuroblastoma are cancers with poor outcome. Immunotherapy in the form of neurotropic oncolytic viruses is a promising therapeutic approach for these malignancies. Here we evaluate the oncolytic capacity of the neurovirulent and partly IFNβ-resistant Semliki Forest virus (SFV)-4 in glioblastoma multiformes and neuroblastomas. To reduce neurovirulence we constructed SFV4miRT, which is attenuated in normal central nervous system (CNS) cells through insertion of microRNA target sequences for miR124, miR125, miR134.Methods: Oncolytic activity of SFV4miRT was examined in mouse neuroblastoma and glioblastoma multiforme cell lines and in patient-derived human glioblastoma cell cultures (HGCC). In vivo neurovirulence and therapeutic efficacy was evaluated in two syngeneic orthotopic glioma models (CT-2A, GL261) and a syngeneic subcutaneous neuroblastoma model (NXS2). The role of IFNβ in inhibiting therapeutic efficacy was investigated.Results: The introduction of miRNA target sequences reduced neurovirulence of SFV4 in terms of attenuated replication in mouse CNS cells and ability to cause encephalitis when administered intravenously. A single intravenous injection of SFV4miRT prolonged survival and cured four of eight mice (50%) with NXS2 and three of 11 mice (27%) with CT-2A, but not for GL261 tumor-bearing mice. In vivo therapeutic efficacy in different tumor models inversely correlated to secretion of IFNβ by respective cells upon SFV4 infection in vitro Similarly, killing efficacy of HGCC lines inversely correlated to IFNβ response and interferon-α/β receptor-1 expression.Conclusions: SFV4miRT has reduced neurovirulence, while retaining its oncolytic capacity. SFV4miRT is an excellent candidate for treatment of glioblastoma multiforme and neuroblastoma with low IFN-β secretion. Clin Cancer Res; 23(6); 1519-30. ©2016 AACR.
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Affiliation(s)
- Mohanraj Ramachandran
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Di Yu
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Matheus Dyczynski
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Sathishkumar Baskaran
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Lei Zhang
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Aleksei Lulla
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Valeria Lulla
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Sirle Saul
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Sven Nelander
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Anna Dimberg
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Justyna Leja-Jarblad
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Magnus Essand
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
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16
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Utt A, Quirin T, Saul S, Hellström K, Ahola T, Merits A. Versatile Trans-Replication Systems for Chikungunya Virus Allow Functional Analysis and Tagging of Every Replicase Protein. PLoS One 2016; 11:e0151616. [PMID: 26963103 PMCID: PMC4786200 DOI: 10.1371/journal.pone.0151616] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 03/01/2016] [Indexed: 02/06/2023] Open
Abstract
Chikungunya virus (CHIKV; genus Alphavirus, family Togaviridae) has recently caused several major outbreaks affecting millions of people. There are no licensed vaccines or antivirals, and the knowledge of the molecular biology of CHIKV, crucial for development of efficient antiviral strategies, remains fragmentary. CHIKV has a 12 kb positive-strand RNA genome, which is translated to yield a nonstructural (ns) or replicase polyprotein. CHIKV structural proteins are expressed from a subgenomic RNA synthesized in infected cells. Here we have developed CHIKV trans-replication systems, where replicase expression and RNA replication are uncoupled. Bacteriophage T7 RNA polymerase or cellular RNA polymerase II were used for production of mRNAs for CHIKV ns polyprotein and template RNAs, which are recognized by CHIKV replicase and encode for reporter proteins. CHIKV replicase efficiently amplified such RNA templates and synthesized large amounts of subgenomic RNA in several cell lines. This system was used to create tagged versions of ns proteins including nsP1 fused with enhanced green fluorescent protein and nsP4 with an immunological tag. Analysis of these constructs and a matching set of replicon vectors revealed that the replicases containing tagged ns proteins were functional and maintained their subcellular localizations. When cells were co-transfected with constructs expressing template RNA and wild type or tagged versions of CHIKV replicases, formation of characteristic replicase complexes (spherules) was observed. Analysis of mutations associated with noncytotoxic phenotype in CHIKV replicons showed that a low level of RNA replication is not a pre-requisite for reduced cytotoxicity. The CHIKV trans-replicase does not suffer from genetic instability and represents an efficient, sensitive and reliable tool for studies of different aspects of CHIKV RNA replication process.
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Affiliation(s)
- Age Utt
- Institute of Technology, University of Tartu, Tartu, 50411, Estonia
| | - Tania Quirin
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Sirle Saul
- Institute of Technology, University of Tartu, Tartu, 50411, Estonia
| | - Kirsi Hellström
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Tero Ahola
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, 50411, Estonia
- * E-mail:
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17
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Abstract
A range of joyful emotions may be woven into the therapeutic group process for older persons. Experiencing joy is a powerful healing factor because it helps reduce the pain of losses inherent in the aging process, restores self-confidence and hope, and renews an investment in living. This paper identifies ten facets of joy which can help develop a therapeutic group climate. Examples from the authors' practice illustrate conceptual approaches.
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Affiliation(s)
- S Saul
- Kingsbridge Heights Nursing Home, Bronx, New York
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18
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Strom BL, Maislin G, West SL, Atkinson B, Herlyn M, Saul S, Rodriguez-Martinez HA, Rios-Dalenz J, Iliopoulos D, Soloway RD. Serum CEA and CA 19-9: potential future diagnostic or screening tests for gallbladder cancer? Int J Cancer 1990; 45:821-4. [PMID: 2335386 DOI: 10.1002/ijc.2910450505] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The poor prognosis of gallbladder cancer and the presence of high-risk populations make the identification of a screening test for this disease very desirable. As part of an ongoing case-control study of gallbladder cancer being conducted in Mexico City, Mexico, and in La Paz, Bolivia, blood specimens were sought from all patients with cancer of the gallbladder and on controls of similar age and sex undergoing upper abdominal surgery. Each sample was analyzed for carcino-embryonic antigen (CEA) and CA 19-9. Using the specimens from Bolivia, a serum CEA cutoff of 4.0 ng/ml yielded a sensitivity of 50.0% and a specificity of 92.7%, while a serum CA 19-9 cutoff of 20.0 units/ml yielded a sensitivity of 79.4% and a specificity of 79.2%. Using ROC curve analysis, the latter was a much better test than the former (p less than 0.05). Using the tests in series or in parallel did not substantively improve the results. The specimens from Mexico were used for validation purposes, and yielded very similar results. In conclusion, serum CA 19-9 and CEA are fairly good tests for discriminating patients with gallbladder cancer from patients with gallstones and no cancer, the former being a better test than the latter. These tests may be useful in identifying disease recurrences. In addition, if a sufficiently high-risk population could be identified, this could potentially become a useful screening test for this serious disease, allowing early intervention. However, additional data are needed prior to recommending this clinically.
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Affiliation(s)
- B L Strom
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104-6095
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19
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Abstract
20 UK general-practice centres entered 243 patients into a 6-week double-blind, double-dummy, randomised, parallel-group trial designed to compare nabumetone 1 g at night with slow release diclofenac 100mg at night in the treatment of osteoarthritis. Seven efficacy parameters were measured, adverse events were recorded and laboratory monitoring was performed. The study monitor entered trial data into a portable laptop microcomputer at the participating centres. Both treatment groups showed highly significant clinical improvements at the end of the 6-week study period and there were no significant inter-group differences. Overall, the incidence of adverse events was similar in the 2 groups, but significantly fewer patients in the nabumetone group (n = 21) than in the diclofenac group (n = 35) complained of gastrointestinal adverse events (p = 0.03). On-site use of the microcomputer contributed to increased monitoring efficiency and trialist motivation, resulting in rapid recruitment of patients, collection of high quality data and speedy analysis at the end of the study.
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Affiliation(s)
- D Laws
- Herrington House, Houghton-le-Spring, Tyne and Wear, United Kingdom
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20
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Strom BL, Iliopoulos D, Atkinson B, Herlyn M, West SL, Maislin G, Saul S, Varello MA, Rodriguez-Martinez HA, Rios-Dalenz J. Pathophysiology of tumor progression in human gallbladder: flow cytometry, CEA, and CA 19-9 levels in bile and serum in different stages of gallbladder disease. J Natl Cancer Inst 1989; 81:1575-80. [PMID: 2795683 DOI: 10.1093/jnci/81.20.1575] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Gallbladder epithelium is unique among the gastrointestinal cell types because proteins and protein levels in the fluid bathing the luminal side of the cells (bile) are different from and can be compared with those in the fluid bathing the basal side (serum). To help identify cellular changes that occur during the development of gallbladder cancer, we obtained gallbladder tissue, serum, and bile specimens from 20 patients with invasive adenocarcinoma of the gallbladder, three with high-grade dysplasia (carcinoma in situ), six with low-grade dysplasia, 12 with hyperplasia, and 10 with acute or chronic cholecystitis. We obtained serum samples from 40 patients with invasive adenocarcinoma and bile samples from 29 of these patients; serum samples from three with high-grade dysplasia and bile specimens from two of these; serum and bile samples from five with low-grade dysplasia; serum or bile samples from 126 with metaplasia, hyperplasia, or cholecystitis, including serum samples from 121 and bile samples from 110; and serum and bile samples from eight with normal biliary tracts. The study was conducted in Mexico City, Mexico, and La Paz, Bolivia. We performed flow cytometric DNA analysis on gallbladder tissue specimens and measured levels of carcinoembryonic antigen (CEA) and CA 19-9 antigen in the serum and bile specimens. Analysis of the cell cycle compartments by flow cytometry revealed marked variations of the proliferation index for the different disease states (P less than .0001). The proliferation index increased with progression from cholecystitis to invasive adenocarcinoma. Of the bile and serum measurements, only serum CA 19-9 values were correlated with flow cytometry measurements (r = -.49, P = .005). Overall, the serum and bile measurements were in agreement (P less than .01). However, with the exception of the correlations among serum measurements for the patients with invasive adenocarcinoma, most of the correlations could be explained by differences in the disease state. In particular, the progression from normal tissue to invasive adenocarcinoma involved no change in bile CA 19-9 level and only a slight change in bile CEA level but much larger changes in serum CEA and CA 19-9 levels. It appears that the progression from normal tissue to invasive adenocarcinoma results in increased production of these antigens and often in loss of cell polarity as well, i.e., inability to prevent leakage of the antigens into the serum.
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Affiliation(s)
- B L Strom
- Department of Medicine, University of Pennsylvania School of Medicine,Philadelphia 19104-6095
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21
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Sugumaran M, Semensi V, Dali H, Saul S. Nonenzymatic transformations of enzymatically generated N-acetyldopamine quinone and isomeric dihydrocaffeiyl methyl amide quinone. FEBS Lett 1989; 255:345-9. [PMID: 2507359 DOI: 10.1016/0014-5793(89)81118-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have recently demonstrated that the side chain hydroxylation of N-acetyldopamine and related compounds observed in several insects is caused by a two-enzyme system catalyzing the initial oxidation of catecholamine derivatives and subsequent isomerization of the resultant quinones to isomeric quinone methides, which undergo rapid nonenzymatic hydration to yield the observed products [Saul, S.J. and Sugumaran, M. (1989) FEBS Lett. 249, 155-158]. During our studies on o-quinone/p-quinone methide tautomerase, we observed that quinone methides are also produced nonenzymatically slowly, under physiological conditions. The quinone methide derived from N-acetyldopamine was hydrated to yield N-acetylnorepinephrine as the stable product as originally shown by Senoh and Witkop [(1959) J. Am. Chem. Soc. 81, 6222-6231], while the isomeric quinone methide from dihydrocaffeiyl methylamide exhibited a new reaction to form caffeiyl amide as the stable product. The identity of this product was established by UV and IR spectral studies and by chemical synthesis. We could not find any evidence of intramolecular cyclization of N-acetyldopamine quinone to iminochrome-type compound(s). The importance of quinone methides in these reactions is discussed.
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Affiliation(s)
- M Sugumaran
- Department of Biology, University of Massachusetts, Boston 02125
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22
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Abstract
We have demonstrated that quinone methide formation is an important aspect of insect physiology and proposed that enzymatically generated quinone methides react nonenzymatically with water or other nucleophiles to form Michael-1,6-addition products [(1988) Adv. Insect Physiol. 21, 179-231; (1989) J. Cell. Biochem. suppl. 13C, 58]. Using a purified o-quinone isomerase from the larval cuticle of Sacrophaga bullata and mushroom tyrosinase, we now demonstrate that transiently formed N-acetyldopamine quinone methide from N-acetyldopamine can be trapped by methanol to produce beta-methoxy N-acetyldopamine. The methanol adduct thus formed was found to be a racemic mixture and can be resolved into the optical isomers on cyclodextrin chiral column. These results confirm our contention that enzymatically generated quinone methides are nonenzymatically and nonstereoselectively transformed to Michael-1,6-adducts by reaction with water or other nucleophiles.
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Affiliation(s)
- M Sugumaran
- Department of Biology, University of Massachusetts, Boston 02125
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23
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Warrington SJ, Dawnay A, Johnston A, Saul S, Turner P, Ferber HP. Chlortenoxicam and renal function of normal human volunteers. Hum Toxicol 1989; 8:53-4. [PMID: 2714812 DOI: 10.1177/096032718900800110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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24
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Abstract
Insoluble cuticle-bound enzyme(s) of Manduca sexta pharate pupae, which is known to convert N-acetyldopamine to N-acetylnorepinephrine through the intermediate formation of quinone methide, also converted exogenously supplied N-acetyldopamine quinone to N-acetylnorepinephrine. The presence of a quinone trap such as N-acetylcysteine in the reaction mixture containing N-acetyldopamine and cuticle prevented the formation of N-acetylnorepinephrine but readily yielded N-acetylcysteine-N-acetyldopamine quinone adduct as a dead-end product. These results indicate the oxidation of N-acetyldopamine to its quinone and its enzyme-catalyzed isomerization to quinone methide before yielding N-acetylnorepinephrine as the stable product. The role of this newly discovered isomerase in sclerotization of insect cuticle is discussed.
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Affiliation(s)
- S Saul
- Department of Biology, University of Massachusetts, Boston 02125
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25
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Abstract
Nonspecific changes in bowel segments adjacent to areas of Crohn disease were identified radiographically in 12 patients. In eight patients such changes were related to fistulization; in four patients they were due to close proximity of an inflammatory mass, abscess, or phlegmon of Crohn disease origin. The radiographic feature of nonspecific involvement was focal fold thickening, either in relation to the site of entry of fistulas or, together with mass effect, in response to the extrinsic inflammatory process. Radiographic differentiation of nonspecific bowel changes from actual Crohn disease is possible and is relevant to management, since nonspecific changes revert to normal once the underlying Crohn disease has been resected. Preoperative identification of nonspecificity supports a more conservative approach to surgery in patients with Crohn disease.
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Saul S. The interdisciplinary component of education in a long term care facility. Nurs Homes 1983; 32:6-10. [PMID: 10310296] [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: 02/12/2023]
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27
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Pazin GJ, Saul S, Thompson ME. Blood Culture Positivity: Suppression by Outpatient Antibiotic Therapy in Patients With Bacterial Endocarditis. ACTA ACUST UNITED AC 1982. [DOI: 10.1001/archinte.1982.00340150063012] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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28
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Pazin GJ, Saul S, Thompson ME. Blood culture positivity: suppression by outpatient antibiotic therapy in patients with bacterial endocarditis. Arch Intern Med 1982; 142:263-8. [PMID: 7059254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Recognition of the increasing prevalence of outpatient antibiotic use prompted this review of 32 patients with verified infectious endocarditis. The results of 161 quantitative blood cultures obtained before definitive therapy were correlated with clinical information to determine whether outpatient antibiotic administration influenced blood culture positivity. In 17 patients receiving outpatient antibiotics, 56 (64%) of 88 blood cultures obtained before definitive treatment were positive, whereas all cultures obtained from 15 patients without recent antibiotic exposure were positive. Notably, seven patients showed a phase of total suppression, and two patients showed a phase of partial suppression of blood culture positivity after discontinuation of outpatient antibiotic treatment. Consequently, patients with recent antibiotic exposure and suspected endocarditis should have blood cultures obtained initially and periodically throughout the phase of potential suppression of bacteremia to optimize the chance of obtaining a positive result.
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29
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Abstract
This paper describes a unique experience in training the staff in the Borders Health District in Scotland in techniques to improve the quality of life of elderly people inside and out of the institution. The reader is given a concise description of the curriculum; the philosophic approach; and the methodology. The latter is of particular interest since it appeals to emotional as well as cognitive learning. These techniques are spelled out as are some of the simple exercises used to demonstrate how elderly people may feel re: specific physical and emotional handicaps. The need for and a plan for administrative support and follow up are described as well as the close relationship of education and improved services.
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30
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Saul S, Berlin M. Helping staff deal with death in the institution. Nurs Homes 1977; 26:22-5. [PMID: 10305670] [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: 02/12/2023]
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31
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32
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33
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Saul SR, Saul S. Social group work in community mental health. Hosp Community Psychiatry 1970; 21:234-5. [PMID: 5489409 DOI: 10.1176/ps.21.7.234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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34
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Saul S. Planning dental office manual. Oral Hyg 1966; 56:35 passim. [PMID: 5218530] [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: 01/14/2023]
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