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Linossi EM, Li K, Veggiani G, Tan C, Dehkhoda F, Hockings C, Calleja DJ, Keating N, Feltham R, Brooks AJ, Li SS, Sidhu SS, Babon JJ, Kershaw NJ, Nicholson SE. Author Correction: Discovery of an exosite on the SOCS2-SH2 domain that enhances SH2 binding to phosphorylated ligands. Nat Commun 2023; 14:7951. [PMID: 38040684 PMCID: PMC10692122 DOI: 10.1038/s41467-023-42706-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2023] Open
Affiliation(s)
- Edmond M Linossi
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Kunlun Li
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Gianluca Veggiani
- The Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada
| | - Cyrus Tan
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Farhad Dehkhoda
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Colin Hockings
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Dale J Calleja
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Rebecca Feltham
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Andrew J Brooks
- The University of Queensland Diamantina Institute, Woolloongabba, QLD, 4102, Australia
| | - Shawn S Li
- Department of Biochemistry and the Siebens-Drake Medical Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada
| | - Sachdev S Sidhu
- The Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada
| | - Jeffrey J Babon
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Nadia J Kershaw
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia.
| | - Sandra E Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia.
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Morris R, Keating N, Tan C, Chen H, Laktyushin A, Saiyed T, Liau NPD, Nicola NA, Tiganis T, Kershaw NJ, Babon JJ. Structure guided studies of the interaction between PTP1B and JAK. Commun Biol 2023; 6:641. [PMID: 37316570 DOI: 10.1038/s42003-023-05020-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 06/06/2023] [Indexed: 06/16/2023] Open
Abstract
Protein Tyrosine Phosphatase 1B (PTP1B) is the prototypical protein tyrosine phosphatase and plays an essential role in the regulation of several kinase-driven signalling pathways. PTP1B displays a preference for bisphosphorylated substrates. Here we identify PTP1B as an inhibitor of IL-6 and show that, in vitro, it can dephosphorylate all four members of the JAK family. In order to gain a detailed understanding of the molecular mechanism of JAK dephosphorylation, we undertook a structural and biochemical analysis of the dephosphorylation reaction. We identified a product-trapping PTP1B mutant that allowed visualisation of the tyrosine and phosphate products of the reaction and a substrate-trapping mutant with a vastly decreased off-rate compared to those previously described. The latter mutant was used to determine the structure of bisphosphorylated JAK peptides bound to the enzyme active site. These structures revealed that the downstream phosphotyrosine preferentially engaged the active site, in contrast to the analogous region of IRK. Biochemical analysis confirmed this preference. In this binding mode, the previously identified second aryl binding site remains unoccupied and the non-substrate phosphotyrosine engages Arg47. Mutation of this arginine disrupts the preference for the downstream phosphotyrosine. This study reveals a previously unappreciated plasticity in how PTP1B interacts with different substrates.
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Affiliation(s)
- Rhiannon Morris
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Narelle Keating
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Cyrus Tan
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Hao Chen
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Artem Laktyushin
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
| | - Tamanna Saiyed
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
| | - Nicholas P D Liau
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Nicos A Nicola
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Tony Tiganis
- Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
- Cancer Immunology Program, Peter MacCallum Cancer Centre, Melbourne, VIC, 3000, Australia
| | - Nadia J Kershaw
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia
| | - Jeffrey J Babon
- Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3052, VIC, Australia.
- Department of Medical Biology, The University of Melbourne, Royal Parade, Parkville, 3052, VIC, Australia.
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3
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Doggett K, Keating N, Dehkhoda F, Bidgood GM, Meza Guzman LG, Leong E, Kueh A, Nicola NA, Kershaw NJ, Babon JJ, Alexander WS, Nicholson SE. The SOCS1 KIR and SH2 domain are both required for suppression of cytokine signaling in vivo. Cytokine 2023; 165:156167. [PMID: 36934508 DOI: 10.1016/j.cyto.2023.156167] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 03/19/2023]
Abstract
Suppressor Of Cytokine Signaling (SOCS) 1 is a critical negative regulator of cytokine signaling and required to protect against an excessive inflammatory response. Genetic deletion of Socs1 results in unrestrained cytokine signaling and neonatal lethality, characterised by an inflammatory immune infiltrate in multiple organs. Overexpression and structural studies have suggested that the SOCS1 kinase inhibitory region (KIR) and Src homology 2 (SH2) domain are important for interaction with and inhibition of the receptor-associated JAK1, JAK2 and TYK2 tyrosine kinases, which initiate downstream signaling. To investigate the role of the KIR and SH2 domain in SOCS1 function, we independently mutated key conserved residues in each domain and analysed the impact on cytokine signaling, and the in vivo impact on SOCS1 function. Mutation of the SOCS1-KIR or SH2 domain had no impact on the integrity of the SOCS box complex, however, mutation within the phosphotyrosine binding pocket of the SOCS1-SH2 domain specifically disrupted SOCS1 interaction with phosphorylated JAK1. In contrast, mutation of the KIR did not affect the interaction with JAK1, but did prevent SOCS1 inhibition of JAK1 autophosphorylation. In human and mouse cell lines, both mutants impacted the ability of SOCS1 to restrain cytokine signaling, and crucially, Socs1-R105A and Socs1-F59A mice displayed a neonatal lethality and excessive inflammatory phenotype similar to Socs1-null mice. This study defines a critical and non-redundant role for both the KIR and SH2 domain in endogenous SOCS1 function.
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Affiliation(s)
- Karen Doggett
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia.
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Farhad Dehkhoda
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Grace M Bidgood
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Lizeth G Meza Guzman
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Evelyn Leong
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia
| | - Andrew Kueh
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Nicos A Nicola
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Nadia J Kershaw
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Jeffrey J Babon
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Warren S Alexander
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Sandra E Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia.
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4
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Ogishi M, Arias AA, Yang R, Han JE, Zhang P, Rinchai D, Halpern J, Mulwa J, Keating N, Chrabieh M, Lainé C, Seeleuthner Y, Ramírez-Alejo N, Nekooie-Marnany N, Guennoun A, Muller-Fleckenstein I, Fleckenstein B, Kilic SS, Minegishi Y, Ehl S, Kaiser-Labusch P, Kendir-Demirkol Y, Rozenberg F, Errami A, Zhang SY, Zhang Q, Bohlen J, Philippot Q, Puel A, Jouanguy E, Pourmoghaddas Z, Bakhtiar S, Willasch AM, Horneff G, Llanora G, Shek LP, Chai LY, Tay SH, Rahimi HH, Mahdaviani SA, Nepesov S, Bousfiha AA, Erdeniz EH, Karbuz A, Marr N, Navarrete C, Adeli M, Hammarstrom L, Abolhassani H, Parvaneh N, Al Muhsen S, Alosaimi MF, Alsohime F, Nourizadeh M, Moin M, Arnaout R, Alshareef S, El-Baghdadi J, Genel F, Sherkat R, Kiykim A, Yücel E, Keles S, Bustamante J, Abel L, Casanova JL, Boisson-Dupuis S. Impaired IL-23-dependent induction of IFN-γ underlies mycobacterial disease in patients with inherited TYK2 deficiency. J Exp Med 2022; 219:213456. [PMID: 36094518 PMCID: PMC9472563 DOI: 10.1084/jem.20220094] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 06/21/2022] [Accepted: 07/14/2022] [Indexed: 12/21/2022] Open
Abstract
Human cells homozygous for rare loss-of-expression (LOE) TYK2 alleles have impaired, but not abolished, cellular responses to IFN-α/β (underlying viral diseases in the patients) and to IL-12 and IL-23 (underlying mycobacterial diseases). Cells homozygous for the common P1104A TYK2 allele have selectively impaired responses to IL-23 (underlying isolated mycobacterial disease). We report three new forms of TYK2 deficiency in six patients from five families homozygous for rare TYK2 alleles (R864C, G996R, G634E, or G1010D) or compound heterozygous for P1104A and a rare allele (A928V). All these missense alleles encode detectable proteins. The R864C and G1010D alleles are hypomorphic and loss-of-function (LOF), respectively, across signaling pathways. By contrast, hypomorphic G996R, G634E, and A928V mutations selectively impair responses to IL-23, like P1104A. Impairment of the IL-23-dependent induction of IFN-γ is the only mechanism of mycobacterial disease common to patients with complete TYK2 deficiency with or without TYK2 expression, partial TYK2 deficiency across signaling pathways, or rare or common partial TYK2 deficiency specific for IL-23 signaling.
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Affiliation(s)
- Masato Ogishi
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Andrés Augusto Arias
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Primary Immunodeficiencies Group, University of Antioquia, Medellin, Colombia,School of Microbiology, University of Antioquia, Medellin, Colombia
| | - Rui Yang
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Ji Eun Han
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Peng Zhang
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Darawan Rinchai
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Joshua Halpern
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Jeanette Mulwa
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Narelle Keating
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Walter and Eliza Hall Institute of Medical Research, Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - Maya Chrabieh
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Candice Lainé
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Yoann Seeleuthner
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Noé Ramírez-Alejo
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Nioosha Nekooie-Marnany
- Acquired Immunodeficiency Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | | | - Bernhard Fleckenstein
- Institute of Clinical and Molecular Virology, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Sara S. Kilic
- Department of Pediatric Immunology and Rheumatology, Faculty of Medicine, Uludag University, Bursa, Turkey
| | - Yoshiyuki Minegishi
- Division of Molecular Medicine, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, Japan
| | - Stephan Ehl
- Institute for Immunodeficiency, Center for Chronic Immunodeficiency, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | | | - Yasemin Kendir-Demirkol
- Department of Pediatric Genetics, Umraniye Training and Research Hospital, University of Health Sciences, Istanbul, Turkey
| | - Flore Rozenberg
- Laboratory of Virology, Assistance Publique-Hôpitaux de Paris, Cochin Hospital, Paris, France
| | - Abderrahmane Errami
- Laboratory of Clinical Immunology, Inflammation and Allergy, Faculty of Medicine and Pharmacy, Hassan II University, Casablanca, Morocco
| | - Shen-Ying Zhang
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Qian Zhang
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Jonathan Bohlen
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Quentin Philippot
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Anne Puel
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Emmanuelle Jouanguy
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Zahra Pourmoghaddas
- Department of Pediatric Infectious Disease, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Shahrzad Bakhtiar
- Division for Stem Cell Transplantation, Immunology and Intensive Care Medicine, Department for Child and Adolescent Medicine, University Hospital Frankfurt, Frankfurt, Germany
| | - Andre M. Willasch
- Division for Stem Cell Transplantation, Immunology and Intensive Care Medicine, Department for Child and Adolescent Medicine, University Hospital Frankfurt, Frankfurt, Germany
| | - Gerd Horneff
- Center for Pediatric Rheumatology, Department of Pediatrics, Asklepios Clinic Sankt Augustin, Sankt Augustin, Germany,Medical Faculty, University of Cologne, Cologne, Germany
| | - Genevieve Llanora
- Division of Allergy and Immunology, Department of Paediatrics, Khoo Teck Puat - National University Children’s Medical Institute, National University Health System, Singapore
| | - Lynette P. Shek
- Division of Allergy and Immunology, Department of Paediatrics, Khoo Teck Puat - National University Children’s Medical Institute, National University Health System, Singapore,Department of Pediatrics, National University of Singapore, Singapore
| | - Louis Y.A. Chai
- Division of Infectious Diseases, Department of Medicine, National University Health System, Singapore,Synthetic Biology for Clinical and Technological Innovation, Life Sciences Institute; Synthetic Biology Translational Research Program, National University of Singapore,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Sen Hee Tay
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore,Division of Rheumatology, Department of Medicine, National University Hospital, Singapore
| | - Hamid H. Rahimi
- Department of Pediatrics, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Seyed Alireza Mahdaviani
- Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Serdar Nepesov
- Department of Pediatric Allergy and Immunology, Istanbul Medipol University, Istanbul, Turkey
| | - Aziz A. Bousfiha
- Clinical Immunology Unit, Department of Pediatrics, King Hassan II University, Ibn-Rochd Hospital, Casablanca, Morocco
| | - Emine Hafize Erdeniz
- Division of Pediatric Infectious Diseases, Ondokuz Mayıs University, Samsun, Turkey
| | - Adem Karbuz
- Division of Pediatric Infectious Diseases, Okmeydani Training and Research Hospital, University of Health Sciences, Istanbul, Turkey
| | | | - Carmen Navarrete
- Department of Immunology, Hospital de Niños Roberto del Río, Santiago de Chile, Chile
| | - Mehdi Adeli
- Division of Allergy and Immunology, Sidra Medicine/Hamad Medical Corp., Doha, Qatar
| | - Lennart Hammarstrom
- Department of Biosciences and Nutrition, Karolinska Institute, Stockholm, Sweden,Beijing Genomics Institute, Shenzhen, China,Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Hassan Abolhassani
- Department of Biosciences and Nutrition, Karolinska Institute, Stockholm, Sweden,Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Nima Parvaneh
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Saleh Al Muhsen
- Immunology Research Laboratory, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Mohammed F. Alosaimi
- Immunology Research Laboratory, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Fahad Alsohime
- Pediatric Department, College of Medicine, King Saud University, Riyadh, Saudi Arabia,Pediatric Intensive Care Unit, King Saud University Medical City, Riyadh, Saudi Arabia
| | - Maryam Nourizadeh
- Immunology, Asthma and Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran,Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Mostafa Moin
- Immunology, Asthma and Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran,Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Rand Arnaout
- Section of Allergy & Immunology, Department of Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia,Al Faisal University, Riyadh, Saudi Arabia
| | - Saad Alshareef
- Section of Allergy & Immunology, Department of Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | | | - Ferah Genel
- University of Health Sciences, Dr Behçet Uz Children’s Hospital, Division of Pediatric Immunology, Izmir, Turkey
| | - Roya Sherkat
- Acquired Immunodeficiency Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Ayça Kiykim
- Pediatric Allergy and Immunology, Cerrahpasa Medical Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Esra Yücel
- Division of Pediatric Allergy and Immunology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Sevgi Keles
- Division of Pediatric Allergy and Immunology, Meram Medical Faculty, Necmettin Erbakan University, Konya, Turkey
| | - Jacinta Bustamante
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Center for the Study of Primary Immunodeficiencies, Assistance Publique-Hôpitaux de Paris, Necker Hospital for Sick Children, Paris, France
| | - Laurent Abel
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
| | - Jean-Laurent Casanova
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France,Howard Hughes Medical Institute, New York, NY,Deparment of Pediatrics, Necker Hospital for Sick Children, Paris, France
| | - Stéphanie Boisson-Dupuis
- St Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM U1163, Paris, France,Paris Cité University, Imagine Institute, Paris, France
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5
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Chen H, Wu Y, Li K, Currie I, Keating N, Dehkhoda F, Grohmann C, Babon JJ, Nicholson SE, Sleebs BE. Optimization of Phosphotyrosine Peptides that Target the SH2 Domain of SOCS1 and Block Substrate Ubiquitination. ACS Chem Biol 2022; 17:449-462. [PMID: 34989544 DOI: 10.1021/acschembio.1c00884] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Suppressor of cytokine signaling 1 (SOCS1) has emerged as a potential therapeutic target in inflammatory and viral diseases. SOCS1 operates via its kinase inhibitory region, Src homology 2 (SH2) domain, and SOCS box to negatively regulate the Janus kinase/signal transducers and activators of transcription signaling pathway. In this study, we utilized native phosphotyrosine peptide substrates as a starting point to iteratively explore the requirement of each amino acid position to target the SH2 domain of SOCS1. We show that Met, Thr, Thr, Val, and Asp in the respective -1, +1, +2, +3, and +5 positions within the peptide substrate are favored for binding to the SOCS1-SH2 domain and identifying several phosphotyrosine peptides that have potent SOCS1 binding affinity with IC50 values ranging from 20 to 70 nM and greater than 100-fold selectivity against the closely related SOCS family proteins, CIS, SOCS2, and SOCS3. The optimized phosphotyrosine peptide was shown to stabilize SOCS1 in a thermal shift assay using cell lysates and inhibited SOCS1-mediated ubiquitination of a target substrate in a biochemical assay. Collectively, these data provide the framework to develop cell-permeable peptidomimetics that further investigate the potential of the SOCS1-SH2 domain as a therapeutic target in inflammatory and viral diseases.
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Affiliation(s)
- Hao Chen
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Yuntong Wu
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Kunlun Li
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Iain Currie
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Farhad Dehkhoda
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Christoph Grohmann
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Jeffrey J. Babon
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Sandra E. Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
| | - Brad E. Sleebs
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia
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6
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Linossi EM, Li K, Veggiani G, Tan C, Dehkhoda F, Hockings C, Calleja DJ, Keating N, Feltham R, Brooks AJ, Li SS, Sidhu SS, Babon JJ, Kershaw NJ, Nicholson SE. Discovery of an exosite on the SOCS2-SH2 domain that enhances SH2 binding to phosphorylated ligands. Nat Commun 2021; 12:7032. [PMID: 34857742 PMCID: PMC8640019 DOI: 10.1038/s41467-021-26983-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 04/11/2021] [Accepted: 10/28/2021] [Indexed: 11/09/2022] Open
Abstract
Suppressor of cytokine signaling (SOCS)2 protein is a key negative regulator of the growth hormone (GH) and Janus kinase (JAK)-Signal Transducers and Activators of Transcription (STAT) signaling cascade. The central SOCS2-Src homology 2 (SH2) domain is characteristic of the SOCS family proteins and is an important module that facilitates recognition of targets bearing phosphorylated tyrosine (pTyr) residues. Here we identify an exosite on the SOCS2-SH2 domain which, when bound to a non-phosphorylated peptide (F3), enhances SH2 affinity for canonical phosphorylated ligands. Solution of the SOCS2/F3 crystal structure reveals F3 as an α-helix which binds on the opposite side of the SH2 domain to the phosphopeptide binding site. F3:exosite binding appears to stabilise the SOCS2-SH2 domain, resulting in slower dissociation of phosphorylated ligands and consequently, enhances binding affinity. This biophysical enhancement of SH2:pTyr binding affinity translates to increase SOCS2 inhibition of GH signaling.
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Affiliation(s)
- Edmond M Linossi
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Kunlun Li
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Gianluca Veggiani
- The Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada
| | - Cyrus Tan
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Farhad Dehkhoda
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Colin Hockings
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Dale J Calleja
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Rebecca Feltham
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Andrew J Brooks
- The University of Queensland Diamantina Institute, Woolloongabba, QLD, 4102, Australia
| | - Shawn S Li
- Department of Biochemistry and the Siebens-Drake Medical Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Canada
| | - Sachdev S Sidhu
- The Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada
| | - Jeffrey J Babon
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Nadia J Kershaw
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia.
| | - Sandra E Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia.
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7
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Quigley N, Keating N, Rooney G, Sheil O, O'Laoide R, McMorrow R, McAuliffe F, Biggi F. Management of an Unstable Preterm COVID-19 Pregnant Woman with Emergency Caesarean Delivery. Ir Med J 2021; 114:246. [PMID: 37556162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
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8
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Fontanella F, Hannes S, Keating N, Martyn F, Browne I, Briet J, McAuliffe FM, Baalman JH. COVID-19 infection during the third trimester of pregnancy: Current clinical dilemmas. Eur J Obstet Gynecol Reprod Biol 2020; 251:268-271. [PMID: 32505514 PMCID: PMC7256511 DOI: 10.1016/j.ejogrb.2020.05.053] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 05/26/2020] [Indexed: 12/19/2022]
Affiliation(s)
- F Fontanella
- Department of Obstetrics and Gynaecology, Medisch Spectrum Twente, Enschede, the Netherlands
| | - S Hannes
- Department of Obstetrics and Gynaecology, Medisch Spectrum Twente, Enschede, the Netherlands
| | - N Keating
- National Maternity Hospital, University College Dublin, Dublin, Ireland
| | - F Martyn
- National Maternity Hospital, University College Dublin, Dublin, Ireland
| | - I Browne
- National Maternity Hospital, University College Dublin, Dublin, Ireland
| | - J Briet
- Department of Obstetrics and Gynaecology, Medisch Spectrum Twente, Enschede, the Netherlands
| | - F M McAuliffe
- National Maternity Hospital, University College Dublin, Dublin, Ireland
| | - J H Baalman
- Department of Obstetrics and Gynaecology, Medisch Spectrum Twente, Enschede, the Netherlands.
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Keating N, Tuakli E, Fornasari L, Townsend M, Conneally K. Physiotherapists can ́make every contact count́ to promote smoking cessation; a quality improvement project on a vascular ward. Physiotherapy 2020. [DOI: 10.1016/j.physio.2020.03.262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Meza Guzman LG, Keating N, Nicholson SE. Natural Killer Cells: Tumor Surveillance and Signaling. Cancers (Basel) 2020; 12:cancers12040952. [PMID: 32290478 PMCID: PMC7226588 DOI: 10.3390/cancers12040952] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/03/2020] [Accepted: 04/09/2020] [Indexed: 12/17/2022] Open
Abstract
Natural killer (NK) cells play a pivotal role in cancer immunotherapy due to their innate ability to detect and kill tumorigenic cells. The decision to kill is determined by the expression of a myriad of activating and inhibitory receptors on the NK cell surface. Cell-to-cell engagement results in either self-tolerance or a cytotoxic response, governed by a fine balance between the signaling cascades downstream of the activating and inhibitory receptors. To evade a cytotoxic immune response, tumor cells can modulate the surface expression of receptor ligands and additionally, alter the conditions in the tumor microenvironment (TME), tilting the scales toward a suppressed cytotoxic NK response. To fully harness the killing power of NK cells for clinical benefit, we need to understand what defines the threshold for activation and what is required to break tolerance. This review will focus on the intracellular signaling pathways activated or suppressed in NK cells and the roles signaling intermediates play during an NK cytotoxic response.
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Affiliation(s)
- Lizeth G. Meza Guzman
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
- Correspondence: (L.G.M.G.); (S.E.N.); Tel.: +61-9345-2555 (S.E.N.)
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Sandra E. Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
- Correspondence: (L.G.M.G.); (S.E.N.); Tel.: +61-9345-2555 (S.E.N.)
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11
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Keating N, Dev K, Hynes AC, Quinlan LR. Mechanism of luminal ATP activated chloride secretion in a polarized epithelium. J Physiol Sci 2019; 69:85-95. [PMID: 29949063 PMCID: PMC10717936 DOI: 10.1007/s12576-018-0623-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 06/06/2018] [Indexed: 10/14/2022]
Abstract
There are both secretory and absorptive pathways working in tandem to support ionic movement driving fluid secretion across epithelia. The mechanisms exerting control of fluid secretion in the oviduct is yet to be fully determined. This study explored the role of apical or luminal extracellular ATP (ATPe)-stimulated ion transport in an oviduct epithelium model, using the Ussing chamber short-circuit current (Isc) technique. Basal Isc in oviduct epithelium in response to apical ATPe comprises both chloride secretion and sodium absorption and has distinct temporal phases. A rapid transient peak followed by a sustained small increase above baseline. Both phases of the apical ATPe Isc response are sensitive to anion (HCO3-, Cl-) and cation (Na+) replacement. Additionally, the role of apical chloride channels, basolateral potassium channels and intracellular calcium in supporting the peak Isc current was confirmed. The role of ATP breakdown to adenosine resulting in the activation of P2 receptors was supported by examining the effects of non-hydrolyzable forms of ATP. A P2YR2 potency profile of ATP = UTP > ADP was generated for the apical membrane, suggesting the involvement of the P2YR2 subtype of purinoceptor. A P2X potency profile of ATP = 2MeSATP > alpha,beta-meATP > BzATP was also generated for the apical membrane. In conclusion, these results provide strong evidence that purinergic activation of apical P2YR2 promotes chloride secretion and is thus an important factor in fluid formation by the oviduct.
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Affiliation(s)
- N Keating
- Physiology, School of Medicine, National University of Ireland, Galway, University Road, Galway, Ireland
| | - K Dev
- Physiology, School of Medicine, National University of Ireland, Galway, University Road, Galway, Ireland
| | - A C Hynes
- Physiology, School of Medicine, National University of Ireland, Galway, University Road, Galway, Ireland
| | - L R Quinlan
- Physiology, School of Medicine, National University of Ireland, Galway, University Road, Galway, Ireland.
- CÚRAM, Centre for Research in Medical Devices, NUI Galway, University Road, Galway, Ireland.
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Affiliation(s)
- N Keating
- Centre for Innovative Ageing, Swansea University, Swansea, UK, SUMMERLAND, British Columbia, Canada
| | - J Eales
- University of Alberta, Edmonton, Canada
| | | | - J Fast
- University of Alberta, Edmonton, Canada
| | - J Min
- Jeju National University, Jeju, South Korea
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O’Loughlin K, Alpass F, Keating N. OPPORTUNITY OR COERCION? INTERNATIONAL PERSPECTIVES ON OLDER WORKERS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- K O’Loughlin
- The University of Sydney, Sydney, New South Wales
| | - F Alpass
- Massey University,New Zealand, Palmerston North, Manawatu-Wanganui
| | - N Keating
- Swansea University, SUMMERLAND, British Columbia
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Walsh K, Keating N. MARGINALIZED VOICES IN OLD-AGE EXCLUSION: DECONSTRUCTING SOCIAL CATEGORIZATIONS AND INTERSECTIONALITY. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- K Walsh
- Irish Centre for Social Gerontology, National University of Ireland Galway, Galway, Galway
| | - N Keating
- Centre for Innovative Ageing, Swansea University, Swansea, UK, SUMMERLAND, British Columbia
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Abstract
Natural killer (NK) cells are innate immune cells with an intrinsic ability to detect and kill infected and cancerous cells. The success of therapies targeting immune checkpoints on CD8 cells has intensified interest in harnessing the cytolytic effector functions of NK cells for new cancer treatments. NK cell development, survival and effector activity is dependent on exposure to the cytokine interleukin (IL)-15. The suppressor of cytokine (SOCS) proteins (CIS; SOCS1-7) are important negative regulators of cytokine signaling, and both CIS and SOCS2 are reported to have roles in regulating NK cell responses. Their immunomodulatory effects on NK cells suggest that these SOCS proteins are promising targets that can potentially form the basis of novel cancer therapies. Here we discuss the role of NK cells in tumor immunity as well as review the role of the SOCS proteins in regulating IL-15 signaling and NK cell function.
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Affiliation(s)
- Narelle Keating
- Walter and Eliza Hall Institute of Medical Research, Melbourne 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne 3010, Australia
| | - Sandra E Nicholson
- Walter and Eliza Hall Institute of Medical Research, Melbourne 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne 3010, Australia.
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Abstract
Immune checkpoint inhibitors harness the power of the immune system to fight cancer. The clinical success achieved with antibodies against the inhibitory T cell receptors PD-1 and CTLA4 has focused attention on the possibility of manipulating other immune cells, in particular those involved in innate immunity. Here we review the role of innate lymphoid cells (ILCs) and their contribution to tumor immunity. As the prototypical ILC, the natural killer (NK) cell has an intrinsic ability to detect and kill cancer cells. NK cells are dependent on the cytokine interleukin (IL)-15 for their development and effector activity. We discuss the role of the Suppressor of cytokine (SOCS) proteins in negatively regulating IL-15 and NK cell responses and the potential for targeting these small intracellular regulators as new immune checkpoints.
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Affiliation(s)
- Sandra E Nicholson
- Walter and Eliza Hall Institute of Medical Research, Melbourne, 3052, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, 3010, Australia.
| | - Narelle Keating
- Walter and Eliza Hall Institute of Medical Research, Melbourne, 3052, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, 3010, Australia
| | - Gabrielle T Belz
- Walter and Eliza Hall Institute of Medical Research, Melbourne, 3052, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, 3010, Australia.
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Abstract
Current research on Alzheimer's disease has been primarily focused on causes and treatment of the disease and on reduction of costs of the burden of care to society. However, considerable emphasis now is placed on person-centered care and the need to enhance the quality of life of people with chronic illnesses and conditions. Alzheimer's disease and related dementias have not been a central part of this discussion despite the lengthy course of the illness which has been described as the disappearance of the person. The purpose of this article is to review the current state of knowledge about quality of life of persons with dementia and to recommend a set of interventions toward enhancing their QoL. Results of the review indicate a set of objective and subjective indicators of QoL with most interventions focused on compensating for losses related to the disease. Based on recent research on personhood and on social exclusion, we propose a framework for creating age-friendly dementia environments. It is based on hypotheses that quality of life can be enhanced through augmenting personal resources and contexts; and that the progression of the illness results in changes in the 'best fit' between resources and contexts.
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Affiliation(s)
- N Keating
- Department of Human Ecology, University of Alberta, Edmonton, AB, Canada
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19
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Abstract
The molecular mechanisms controlling fluid secretion within the oviduct have yet to be determined. As in other epithelia, both secretory and absorptive pathways are likely to work in tandem to drive appropriate ionic movement to support fluid movement across the oviduct epithelium. This study explored the role of potassium channels in basolateral extracellular ATP (ATP(e))-stimulated ion transport in bovine oviduct epithelium using the Ussing chamber short-circuit current (I(SC)) technique. Basal I(SC) in bovine oviduct epithelium comprises both chloride secretion and sodium absorption and was inhibited by treatment with basolateral K(+) channel inhibitors tetrapentlyammonium chloride (TPeA) or BaCl(2). Similarly, ATP-stimulated chloride secretion was significantly attenuated by pretreatment with BaCl(2,) tetraethylammonium (TEA), tolbutamide, and TPeA. Basolateral K(+) current, isolated using nystatin-perforation technique, was rapidly activated by ATP(e), and pretreatment of monolayers with thapsigargin or TPeA abolished this ATP-stimulated K(+) current. To further investigate the type of K(+) channel involved in the ATP response in the bovine oviduct, a number of specific Ca(2+)-activated K(+) channel inhibitors were tested on the ATP-induced ΔI(SC) in intact monolayers. Charbydotoxin, (high conductance and intermediate conductance inhibitor), or paxilline, (high conductance inhibitor) did not significantly alter the ATP(e) response. However, pretreatment with the small conductance inhibitor apamin resulted in a 60% reduction in the response to ATP(e). The presence of small conductance family member KCNN3 was confirmed by RT-PCR and immunohistochemistry. Measurements of intracellular calcium using Fura-2 spectrofluorescence imaging revealed the ability of ATP(e) to increase intracellular calcium in a phospholipase C-inositol 1,4,5-trisphosphate pathway-sensitive manner. In conclusion, these results provide strong evidence that purinergic activation of a calcium-dependent, apamin-sensitive potassium conductance is essential to promote chloride secretion and thus fluid formation in the oviduct.
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Affiliation(s)
- N Keating
- Department of Physiology, School of Medicine, National University of Ireland Galway, Galway, Ireland
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Keating N. Critical reflections on families of older adults. Adv Gerontol 2011; 24:343-349. [PMID: 21957599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Families are a central feature in the debate about how societies will face the challenges of population aging. In much of the contemporary discourse about families they are viewed as fully responsible for the care and support of their older members, with national differences in whether this responsibility is seen as a societal obligation or an unreasonable burden. Researchers and policy makers have expressed rising concerns about how structural changes to families and their increasing geographic mobility may threaten their caring capacity. Across regions and countries, there is considerable research on whether older adults are embedded in stable family networks from which they can draw support if needed. A more muted theme about the place of families in the lives of older adults places older persons as agents rather than passive recipients in their families. Within this body of literature, there is evidence of the important role of older adults in strengthening cohesion in families, fostering generational connections and caring for younger family members. The transfer of resources from older to younger members is an important feature in both marginalized and affluent families in different regions of the world. It illustrates the way that older adults provide stability to their families in the face of rapid social change. In this paper an overview is presented of the international literature on these complex issues of the place of families in the lives of older adults. Myths about families, regional variation in beliefs about their roles and obligations, and evidence of family structure and household composition of older persons are addressed and regional differences considered.
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Affiliation(s)
- N Keating
- University of Alberta, Edmonton, AB, T6G 2N1, Canada.
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Abstract
The composition of the fluid within the oviduct is largely determined by the secretory and absorptive activities of the oviduct epithelium. The present study explored the effects of basolateral nucleotide stimulation on ion transport in the bovine oviduct using the chamber short-circuit current technique. Basolateral application of ATP induced a rapid transient increase in ion secretion by oviduct epithelial monolayers in a concentration-dependent manner. The ATP-induced short-circuit current (I(SC)) response was preserved in the presence of amiloride, whereas it was reduced in the absence of extracellular chloride or in the presence of bumetanide. The channels underlying the chloride secretory response were identified as Ca(2+)-activated Cl(-) channels and CFTR. The ATP-induced Cl(-) secretory response was largely preserved in the absence of extracellular Ca(2+) but was significantly reduced in the presence of BAPTA-am (1,2-bis(2-aminophenoxy)ethane N,N,N',N'-tetraacetic acid-acetomethoxy ester), thapsigargin, or 2-APB (2-aminoethoxydiphenylborate), demonstrating an important role for intracellular Ca(2+) signaling in mediating these effects. A nucleotide potency profile of ATP = UTP (uridine triphosphate) > ADP, sensitivity to suramin, and cross-desensitization by basolateral UTP suggests that ATP exerted its effects on chloride secretion through the purinergic receptor P2Y, G protein-coupled 2, and the presence of the P2RY2 gene was confirmed by RT-PCR. These results provide strong evidence that purinergic signaling constitutes a key mechanism of regulating chloride secretion and thus fluid formation in the bovine oviduct.
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Affiliation(s)
- N Keating
- Department of Physiology, National University of Ireland Galway, Galway, Ireland
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Nguyen-Van-Tam J, Granfield R, Pearson J, Fleming D, Keating N. Do influenza epidemics affect patterns of sickness absence among British hospital staff? Infect Control Hosp Epidemiol 1999; 20:691-4. [PMID: 10530649 DOI: 10.1086/501568] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Influenza vaccination for healthcare workers is not recommended in Britain, but some hospitals offer vaccine to reduce sickness absence. However, in Nottingham, the influenza epidemics of 1993-94 and 1996-97 made no impact on staff absence. Annual vaccination of healthcare workers against influenza is unlikely to reduce absence most winters, but there may be gains in terms of preventing nosocomial infection.
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Affiliation(s)
- J Nguyen-Van-Tam
- Division of Public Health Medicine and Epidemiology, University of Nottingham Medical School, United Kingdom
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Earnshaw SA, Keating N, Hosking DJ, Chilvers CE, Ravn P, McClung M, Wasnich RD. Tooth counts do not predict bone mineral density in early postmenopausal Caucasian women. EPIC study group. Int J Epidemiol 1998; 27:479-83. [PMID: 9698139 DOI: 10.1093/ije/27.3.479] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND It has been suggested that poor dental status may be a suitable criterion for bone densitometry referral in early postmenopausal women. We evaluated this hypothesis in a cohort of 1365 Caucasian women aged between 45 and 59 years, who were enrolled into an international multi-centre trial. METHODS Subjects were recruited at four study centres, using population-based techniques. Bone mineral density (BMD) at the lumbar spine and proximal femur was measured by dual energy x-ray absorptiometry (DXA) (Hologic QDR 2000). A full physical examination was performed including a tooth count. RESULTS Baseline tooth counts ranged from 0 to 32 (median 26): 84 (6%) subjects were edentulous. When classified according to the WHO criteria 445 (33%) of the subjects were osteoporotic at one or more of the skeletal sites analysed; 694 (51%) were osteopenic, and 226 (16%) were normal. Adjusting for confounding variables, there was no significant correlation between tooth count and BMD at any skeletal site. Subjects were divided into tertiles of tooth count, and chi2 tests used to compare the two 'extreme' groups against the WHO criteria for BMD. At each of the six BMD regions the proportion of subjects with normal, osteopenic or osteoporotic BMD was similar for both tertiles. CONCLUSIONS We found no relationship between tooth count and BMD in early postmenopausal women. This may be because in younger women dental status is a reflection more of dietary habits and past dental surgery than of age-related bone loss. Tooth counts therefore cannot be used to identify individuals at risk of osteoporosis.
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25
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Gray D, Keating N, Skene AM, Hampton JR. Myocardial infarction in patients over 75 1982-1990. Q J Med 1992; 84:659-69. [PMID: 1480740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Admissions to hospital of patients aged 75 or over with symptoms suggestive of acute myocardial infarction have increased markedly since 1982. Patients over 75 present to hospital as soon after the onset of symptoms as do younger patients; they require more treatment with diuretics and digoxin than do younger patients and their fatality rate is higher. Despite this, the chance of patients over 75, especially women, being admitted to a Coronary Care Unit, and so being treated with a thrombolytic and being monitored closely for the complications of acute infarction are much less than those for patients under 75. If we are confident that we can influence the outcome of and reduce fatality from acute myocardial infarction, we should be prepared to offer elderly patients the same opportunities for treatment that we currently afford to younger patients.
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Affiliation(s)
- D Gray
- Department of Medicine, University Hospital, Nottingham
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Keating N. What roles are physical therapists assuming in regional medical programs? Phys Ther 1971; 51:236-7. [PMID: 5541411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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