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Hashim H, Aziz A, Tyrrell B, Leung R, Brass N, Dorsch M. INITIAL EXPERIENCE WITH THE USE OF INTRAVASCULAR LITHOTRIPSY FOR CORONARY CALCIUM MODIFICATION. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.076] [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: 10/20/2022] Open
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Brass N, Hidson C, Tyrrell B, Dorsch M. PROLONGED DUAL ANTIPLATELET THERAPY AFTER ACS: 1 YEAR EXPERIENCE OF A DEDICATED DAPT CLINIC. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Sathananthan J, Webb J, Lauck S, Cairns J, Murdoch D, Cook R, Humphries K, Park J, Zhao Y, Welsh R, Leipsic J, Genereux P, Tyrrell B, Alqoofi F, Velianou J, Natarajan M, Wijeysundera H, Radhakrishnan S, Horlick E, Osten M, Asgar A, Kodali S, Nazif T, Thourani V, Babaliaros V, Cohen D, Masson J, Klein R, Rondi K, Umedaly H, Leon M, Wood D. IMPACT OF LEVEL OF ANAESTHESIA USING THE VANCOUVER CLINICAL PATHWAY FOR TRANSCATHETER AORTIC VALVE REPLACEMENT: INSIGHTS FROM THE 3M TAVR STUDY. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Suandork P, Brass N, Cheung P, Tyrrell B, Dorsch M, Leung R, Hui W. OVERCOMING EXTREMELY CALCIFIED CORONARY LESIONS WITH A DEDICATED SUPER HIGH-PRESSURE BALLOON: A SINGLE HOSPITAL EXPERIENCE. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Bainey K, Zheng Y, Brass N, Tyrrell B, Leung R, Westerhout C, Armstrong P, Welsh R. P2723A real world comparison of a pharmacoinvasive versus primary PCI strategy in ST-elevation myocardial infarction: ST-segment recovery and clinical outcome. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2723] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- K Bainey
- Canadian Vigour Center, Edmonton, Canada
| | - Y Zheng
- Canadian Vigour Center, Edmonton, Canada
| | - N Brass
- University of Alberta, Edmonton, Canada
| | - B Tyrrell
- University of Alberta, Edmonton, Canada
| | - R Leung
- University of Alberta, Edmonton, Canada
| | | | | | - R Welsh
- University of Alberta, Edmonton, Canada
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Ciarlo E, Heinonen T, Théroude C, Herderschee J, Mombelli M, Lugrin J, Pfefferlé M, Tyrrell B, Lensch S, Acha-Orbea H, Le Roy D, Auwerx J, Roger T. Sirtuin 2 Deficiency Increases Bacterial Phagocytosis by Macrophages and Protects from Chronic Staphylococcal Infection. Front Immunol 2017; 8:1037. [PMID: 28894448 PMCID: PMC5581327 DOI: 10.3389/fimmu.2017.01037] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [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: 04/08/2017] [Accepted: 08/11/2017] [Indexed: 12/17/2022] Open
Abstract
Sirtuin 2 (SIRT2) is one of the seven members of the family of NAD+-dependent histone deacetylases. Sirtuins target histones and non-histone proteins according to their subcellular localization, influencing various biological processes. SIRT2 resides mainly in the cytoplasm and regulates cytoskeleton dynamics, cell cycle, and metabolic pathways. As such, SIRT2 has been implicated in the pathogenesis of neurodegenerative, metabolic, oncologic, and chronic inflammatory disorders. This motivated the development of SIRT2-directed therapies for clinical purposes. However, the impact of SIRT2 on antimicrobial host defense is largely unknown. Here, we address this question using SIRT2 knockout mice. We show that SIRT2 is the most highly expressed sirtuin in myeloid cells, especially macrophages. SIRT2 deficiency does not affect immune cell development and marginally impacts on intracellular signaling and cytokine production by splenocytes and macrophages. However, SIRT2 deficiency enhances bacterial phagocytosis by macrophages. In line with these observations, in preclinical models, SIRT2 deficiency increases survival of mice with chronic staphylococcal infection, while having no effect on the course of toxic shock syndrome toxin-1, LPS or TNF-induced shock, fulminant Escherichia coli peritonitis, sub-lethal Klebsiella pneumoniae pneumonia, and chronic candidiasis. Altogether, these data support the safety profile of SIRT2 inhibitors under clinical development in terms of susceptibility to infections.
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Affiliation(s)
- Eleonora Ciarlo
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Tytti Heinonen
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Charlotte Théroude
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Jacobus Herderschee
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Matteo Mombelli
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Jérôme Lugrin
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Marc Pfefferlé
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Beatrice Tyrrell
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Sarah Lensch
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Hans Acha-Orbea
- Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | - Didier Le Roy
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
| | - Johan Auwerx
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Thierry Roger
- Infectious Diseases Service, Department of Medicine, Lausanne University Hospital, Epalinges, Switzerland
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Gouda P, Paterson C, Meyer S, Shanks M, Butler C, Taylor D, Tyrrell B, Welsh R. QUALITY OF LIFE AND FRAILTY FOLLOWING TRANSCATHETER AORTIC VALVE IMPLANTATION. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.279] [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: 10/20/2022] Open
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Webster SJ, Ellis L, O'Brien LM, Tyrrell B, Fitzmaurice TJ, Elder MJ, Clare S, Chee R, Gaston JSH, Goodall JC. IRE1α mediates PKR activation in response to Chlamydia trachomatis infection. Microbes Infect 2016; 18:472-83. [PMID: 27021640 PMCID: PMC4936793 DOI: 10.1016/j.micinf.2016.03.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 02/09/2016] [Accepted: 03/18/2016] [Indexed: 12/20/2022]
Abstract
Protein kinase RNA activated (PKR) is a crucial mediator of anti-viral responses but is reported to be activated by multiple non-viral stimuli. However, mechanisms underlying PKR activation, particularly in response to bacterial infection, remain poorly understood. We have investigated mechanisms of PKR activation in human primary monocyte-derived dendritic cells in response to infection by Chlamydia trachomatis. Infection resulted in potent activation of PKR that was dependent on TLR4 and MyD88 signalling. NADPH oxidase was dispensable for activation of PKR as cells from chronic granulomatous disease (CGD) patients, or mice that lack NADPH oxidase activity, had equivalent or elevated PKR activation. Significantly, stimulation of cells with endoplasmic reticulum (ER) stress-inducing agents resulted in potent activation of PKR that was blocked by an inhibitor of IRE1α RNAse activity. Crucially, infection resulted in robust IRE1α RNAse activity that was dependent on TLR4 signalling and inhibition of IRE1α RNAse activity prevented PKR activation. Finally, we demonstrate that TLR4/IRE1α mediated PKR activation is required for the enhancement of interferon-β production following C. trachomatis infection. Thus, we provide evidence of a novel mechanism of PKR activation requiring ER stress signalling that occurs as a consequence of TLR4 stimulation during bacterial infection and contributes to inflammatory responses.
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Affiliation(s)
- Steve J Webster
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | - Lou Ellis
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | - Louise M O'Brien
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | - Beatrice Tyrrell
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | | | - Matthew J Elder
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | - Simon Clare
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, UK
| | - Ronnie Chee
- Department of Immunology, Royal Free Hospital, London, UK
| | - J S Hill Gaston
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK
| | - Jane C Goodall
- Rheumatology Research Group, Department of Medicine, University of Cambridge, UK.
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Shavadia J, Bainey K, Tyrrell B, Brass N, Paterson C, Knapp D, Welsh R. HALF-DOSE TENECTEPLASE COMPARED TO CONVENTIONAL ST-SEGMENT MYOCARDIAL INFARCTION (STEMI) REPERFUSION STRATEGIES IN THE ELDERLY: AN OBSERVATIONAL ANALYSIS. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Hui W, Fung R, Dorsch M, Ranjbar K, Cheung P, Tyrrell B, Leung R, Brass N. LEFT MAIN INTERVENTIOIN IN A STANDALONE PCI CENTRE - A RECENT 5 YEAR EXPERIENCE. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.107] [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] Open
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Fung C, Williams R, Tyrrell B. MEASUREMENT OF CARDIAC OUTPUT BY NON-INVASIVE CONTINUOUS WHOLE-BODY BIOIMPEDANCE CARDIOGRAPHY IN PATIENTS WITH AORTIC STENOSIS. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.380] [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] Open
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Pongnonthachai P, Bundhoo S, Brass N, Tyrrell B, Leung R, Ranjbar K, Dorsch M, Cheung P, Hui W. The Transradial Approach for Primary Percutaneous Coronary Interventions in Octagenarians: Its Safety, Feasibility and Limitations. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Pongnonthachai P, Bundhoo S, Brass N, Tyrrell B, Ranjbar K, Dorsch M, Cheung P, Hui W, Leung R. Success Rates of Percutaneous Coronary Intervention to Chronic Total Occlusions Continues to Improve After the Adoption of a CTO-PCI Programme in Standalone PCI Centres - a Single Centre Canadian Experience. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.475] [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: 10/26/2022] Open
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Ngunga L, Cheung P, Bundhoo S, Brass N, Tyrrell B, Leung R, Harbi A, Dorsch M, Hui W. 172 Paucity of Events in the Long Term Follow Up Of Patients With Coronary Bifurcation Lesions Treated With Drug Eluting Stents. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.174] [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: 10/27/2022] Open
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Ngunga L, Bundhoo S, Hui W, Brass N, Tyrrell B, Leung R, Dorsch M, Ranjbar K, Cheung P. 304 Predictors of Outcome in the Long Term Outcome of Patients Treated With Drug Eluting Stents: Results Of An Early Canadian Cohort. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.286] [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: 10/27/2022] Open
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Bundhoo S, Hui W, Brass N, Tyrrell B, Cheung P, Leung R. 297 The Application of an Angiographic Scoring System to Tailor Approaches And Predict Success In Chronic Total Occlusion Percutaneous Coronary Interventions (CTO PCI). Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Bundhoo S, Hui W, Brass N, Tyrrell B, Cheung P, Leung R. 307 Percutaneous Coronary Intervention To Chronic Total Occlusions Can Be Safely And Effectively Performed In Standalone PCI Centres. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dorsch M, Nath E, Ranjbar K, Brass N, Chan M, Young P, Leung R, Tyrrell B, Cheung P, Hui W. 329 First experience with the guideliner mother in child catheter for the treatment of complex coronary lesions. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Abstract
Abnormalities of the pituitary fossa were observed in 22 patients who were noted to have increased skin pigmentation after bilateral adrenalectomy for Cushing's syndrome. Radiographs of the skull revealed sella abnormalities in 13 of the 22 patients. In the remaining 9, hypocycloidal tomography demonstrated sella abnormalities. In 8 of these 9, localized bulging involved the anterior inferior wall of the sella turcica; in 1, the posterior inferior region was involved.
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