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Hosseini-Moghaddam SM, Kothari S, Humar A, Albasata H, Yetmar ZA, Razonable RR, Neofytos D, D'Asaro M, Boggian K, Hirzel C, Khanna N, Manuel O, Mueller NJ, Imlay H, Kabbani D, Tyagi V, Smibert OC, Nasra M, Fontana L, Obeid KM, Apostolopoulou A, Zhang SX, Permpalung N, Alhatimi H, Silverman MS, Guo H, Rogers BA, MacKenzie E, Pisano J, Gioia F, Rapi L, Prasad GVR, Banegas M, Alonso CD, Doss K, Rakita RM, Fishman JA. Adjunctive glucocorticoid therapy for Pneumocystis jirovecii pneumonia in solid organ transplant recipients: A multicenter cohort, 2015-2020. Am J Transplant 2024; 24:653-668. [PMID: 37977229 DOI: 10.1016/j.ajt.2023.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/21/2023] [Accepted: 11/06/2023] [Indexed: 11/19/2023]
Abstract
Solid organ transplant recipients (SOTRs) frequently receive adjunctive glucocorticoid therapy (AGT) for Pneumocystis jirovecii pneumonia (PJP). This multicenter cohort of SOTRs with PJP admitted to 20 transplant centers in Canada, the United States, Europe, and Australia, was examined for whether AGT was associated with a lower rate of all-cause intensive care unit (ICU) admission, 90-day death, or a composite outcome (ICU admission or death). Of 172 SOTRs with PJP (median [IQR] age: 60 (51.5-67.0) years; 58 female [33.7%]), the ICU admission and death rates were 43.4%, and 20.8%, respectively. AGT was not associated with a reduced risk of ICU admission (adjusted odds ratio [aOR] [95% CI]: 0.49 [0.21-1.12]), death (aOR [95% CI]: 0.80 [0.30-2.17]), or the composite outcome (aOR [95% CI]: 0.97 [0.71-1.31]) in the propensity score-adjusted analysis. AGT was not significantly associated with at least 1 unit of the respiratory portion of the Sequential Organ Failure Assessment score improvement by day 5 (12/37 [32.4%] vs 39/111 [35.1%]; P = .78). We did not observe significant associations between AGT and ICU admission or death in SOTRs with PJP. Our findings should prompt a reevaluation of routine AGT administration in posttransplant PJP treatment and highlight the need for interventional studies.
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Affiliation(s)
- Seyed M Hosseini-Moghaddam
- Transplant Infectious Diseases and Ajmera Transplant Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Sagar Kothari
- Transplant Infectious Diseases and Ajmera Transplant Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Atul Humar
- Transplant Infectious Diseases and Ajmera Transplant Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Hanan Albasata
- Transplant Infectious Diseases and Ajmera Transplant Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Zachary A Yetmar
- Division of Public Health, Infectious Diseases, and Occupational Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Raymund R Razonable
- Division of Public Health, Infectious Diseases, and Occupational Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Dionysios Neofytos
- Transplant Infectious Diseases Unit, Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
| | - Matilde D'Asaro
- Transplant Infectious Diseases Unit, Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
| | - Katia Boggian
- Division of Infectious Diseases, Cantonal Hospital St Gallen, St Gallen, Switzerland
| | - Cedric Hirzel
- Department of Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nina Khanna
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital of Basel, Basel, Switzerland
| | - Oriol Manuel
- Division of Infectious Diseases, University Hospital of Vaud, Lausanne, Switzerland
| | - Nicolas J Mueller
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital of Zurich, Switzerland
| | - Hannah Imlay
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Dima Kabbani
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Varalika Tyagi
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Olivia C Smibert
- Department of Infectious Diseases, Austin Health, Heidelberg, Victoria, Australia; Department of Medicine, The University of Melbourne at Austin Health, Heidelberg, Victoria, Australia; Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Victoria, Australia; The National Centre for Infections in Cancer, Peter MacCallum Cancer Centre, Parkville, Victoria, Australia
| | - Mohamed Nasra
- Department of Infectious Diseases, Austin Health, Heidelberg, Victoria, Australia; Department of Medicine, The University of Melbourne at Austin Health, Heidelberg, Victoria, Australia; Monash Health, Melbourne, Victoria, Australia
| | - Lauren Fontana
- Division of Infectious Diseases and International Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Karam M Obeid
- Division of Infectious Diseases and International Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Anna Apostolopoulou
- Transplant Infectious Disease Program and Transplant Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Sean X Zhang
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Nitipong Permpalung
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Hind Alhatimi
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Michael S Silverman
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Henry Guo
- Monash Health, Melbourne, Victoria, Australia
| | - Benjamin A Rogers
- Monash Health, Melbourne, Victoria, Australia; School of Clinical Sciences at Monash Health, Monash University, Clayton, Victoria, Australia
| | - Erica MacKenzie
- Section of Infectious Diseases and Global Health, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA
| | - Jennifer Pisano
- Section of Infectious Diseases and Global Health, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA
| | - Francesca Gioia
- Department of Infectious Diseases, Hospital Roman y Cajal, Madrid, Spain
| | - Lindita Rapi
- Kidney Transplant Program, St. Michael Hospital, University of Toronto, Toronto, Ontario, Canada
| | - G V Ramesh Prasad
- Kidney Transplant Program, St. Michael Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Marcela Banegas
- Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Carolyn D Alonso
- Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Kathleen Doss
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Robert M Rakita
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Jay A Fishman
- Transplant Infectious Disease Program and Transplant Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
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2
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Andary CM, Al KF, Chmiel JA, Gibbons S, Daisley BA, Parvathy SN, Maleki Vareki S, Bowdish DME, Silverman MS, Burton JP. Dissecting mechanisms of fecal microbiota transplantation efficacy in disease. Trends Mol Med 2024; 30:209-222. [PMID: 38195358 DOI: 10.1016/j.molmed.2023.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 01/11/2024]
Abstract
Fecal microbiota transplantation (FMT) has emerged as an alternative or adjunct experimental therapy for microbiome-associated diseases following its success in the treatment of recurrent Clostridioides difficile infections (rCDIs). However, the mechanisms of action involved remain relatively unknown. The term 'dysbiosis' has been used to describe microbial imbalances in relation to disease, but this traditional definition fails to consider the complex cross-feeding networks that define the stability of the microbiome. Emerging research transitions toward the targeted restoration of microbial functional networks in treating different diseases. In this review, we explore potential mechanisms responsible for the efficacy of FMT and future therapeutic applications, while revisiting definitions of 'dysbiosis' in favor of functional network restoration in rCDI, inflammatory bowel diseases (IBDs), metabolic diseases, and cancer.
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Affiliation(s)
- Catherine M Andary
- Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Kait F Al
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada; Lawson Health Research Institute, London, Ontario, Canada
| | - John A Chmiel
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada; Lawson Health Research Institute, London, Ontario, Canada
| | - Shaeley Gibbons
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada; Lawson Health Research Institute, London, Ontario, Canada
| | - Brendan A Daisley
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Seema Nair Parvathy
- Division of Infectious Disease, St. Joseph's Health Care, London, Ontario, Canada
| | - Saman Maleki Vareki
- Lawson Health Research Institute, London, Ontario, Canada; Department of Oncology, Western University, London, Ontario, Canada; Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada
| | - Dawn M E Bowdish
- Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada; McMaster Immunology Research Centre and the Firestone Institute for Respiratory Health, McMaster University, Hamilton, Ontario, Canada
| | - Michael S Silverman
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Lawson Health Research Institute, London, Ontario, Canada; Division of Infectious Disease, St. Joseph's Health Care, London, Ontario, Canada
| | - Jeremy P Burton
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada; Lawson Health Research Institute, London, Ontario, Canada; Department of Surgery, Western University, London, Ontario, Canada.
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3
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Routy B, Lenehan JG, Miller WH, Jamal R, Messaoudene M, Daisley BA, Hes C, Al KF, Martinez-Gili L, Punčochář M, Ernst S, Logan D, Belanger K, Esfahani K, Richard C, Ninkov M, Piccinno G, Armanini F, Pinto F, Krishnamoorthy M, Figueredo R, Thebault P, Takis P, Magrill J, Ramsay L, Derosa L, Marchesi JR, Parvathy SN, Elkrief A, Watson IR, Lapointe R, Segata N, Haeryfar SMM, Mullish BH, Silverman MS, Burton JP, Maleki Vareki S. Author Correction: Fecal microbiota transplantation plus anti-PD-1 immunotherapy in advanced melanoma: a phase I trial. Nat Med 2024; 30:604. [PMID: 37923839 DOI: 10.1038/s41591-023-02650-8] [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: 11/06/2023]
Affiliation(s)
- Bertrand Routy
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - John G Lenehan
- Department of Oncology, Western University, London, Ontario, Canada
- Lawson Health Research Institute, London, Ontario, Canada
| | - Wilson H Miller
- Lady Davis Institute of the Jewish General Hospital, Segal Cancer Centre, Montreal, Quebec, Canada
- Departments of Oncology and Medicine, McGill University, Montreal, Quebec, Canada
| | - Rahima Jamal
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Meriem Messaoudene
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Brendan A Daisley
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Cecilia Hes
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Peter Brojde Lung Cancer Center, Jewish General Hospital, Montreal, Quebec, Canada
| | - Kait F Al
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Laura Martinez-Gili
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
- Section of Bioinformatics, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, UK
| | - Michal Punčochář
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Scott Ernst
- Department of Oncology, Western University, London, Ontario, Canada
| | - Diane Logan
- Department of Oncology, Western University, London, Ontario, Canada
| | - Karl Belanger
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Khashayar Esfahani
- Lady Davis Institute of the Jewish General Hospital, Segal Cancer Centre, Montreal, Quebec, Canada
- Departments of Oncology and Medicine, McGill University, Montreal, Quebec, Canada
| | - Corentin Richard
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Marina Ninkov
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
| | - Gianmarco Piccinno
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Federica Armanini
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Federica Pinto
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Mithunah Krishnamoorthy
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada
| | - Rene Figueredo
- Department of Oncology, Western University, London, Ontario, Canada
| | - Pamela Thebault
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Panteleimon Takis
- Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, National Phenome Centre, Imperial College London, London, UK
- Section of Bioanalytical Chemistry, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK
| | - Jamie Magrill
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
| | - LeeAnn Ramsay
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
| | - Lisa Derosa
- Gustave Roussy Cancer Campus, Villejuif, France
- Cancer Medicine Department, Gustave Roussy, Villejuif, France
- Institut National de la Santé Et et de la Recherche Médicale (INSERM) U1015, ClinicObiome, Equipe Labellisée-28 Ligue Nationale contre le Cancer, Villejuif, France
- Université Paris-Saclay, Ile-de-France, France
| | - Julian R Marchesi
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
| | - Seema Nair Parvathy
- Department of Medicine, Division of Infectious Diseases, Western University, London, Ontario, Canada
- Division of Infectious Diseases, St Joseph's Health Care, London, Ontario, Canada
| | - Arielle Elkrief
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Ian R Watson
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
- Department of Biochemistry, McGill University, Montréal, Quebec, Canada
| | - Rejean Lapointe
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Département de Médecine, Faculté de Médecine, Université de Montréal, Montréal, Quebec, Canada
| | - Nicola Segata
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - S M Mansour Haeryfar
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Department of Medicine, Division of Clinical Immunology and Allergy, Western University, London, Ontario, Canada
- Department of Surgery, Division of General Surgery, Western University, London, Ontario, Canada
| | - Benjamin H Mullish
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
- Departments of Gastroenterology and Hepatology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Michael S Silverman
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Department of Medicine, Division of Infectious Diseases, Western University, London, Ontario, Canada
- Division of Infectious Diseases, St Joseph's Health Care, London, Ontario, Canada
| | - Jeremy P Burton
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Saman Maleki Vareki
- Department of Oncology, Western University, London, Ontario, Canada.
- Lawson Health Research Institute, London, Ontario, Canada.
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada.
- Department of Medical Biophysics, Western University, London, Ontario, Canada.
- Ontario Institute of Cancer Research, Toronto, Ontario, Canada.
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4
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Routy B, Lenehan JG, Miller WH, Jamal R, Messaoudene M, Daisley BA, Hes C, Al KF, Martinez-Gili L, Punčochář M, Ernst S, Logan D, Belanger K, Esfahani K, Richard C, Ninkov M, Piccinno G, Armanini F, Pinto F, Krishnamoorthy M, Figueredo R, Thebault P, Takis P, Magrill J, Ramsay L, Derosa L, Marchesi JR, Parvathy SN, Elkrief A, Watson IR, Lapointe R, Segata N, Haeryfar SMM, Mullish BH, Silverman MS, Burton JP, Maleki Vareki S. Fecal microbiota transplantation plus anti-PD-1 immunotherapy in advanced melanoma: a phase I trial. Nat Med 2023; 29:2121-2132. [PMID: 37414899 DOI: 10.1038/s41591-023-02453-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 45.0] [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] [Received: 02/09/2023] [Accepted: 06/08/2023] [Indexed: 07/08/2023]
Abstract
Fecal microbiota transplantation (FMT) represents a potential strategy to overcome resistance to immune checkpoint inhibitors in patients with refractory melanoma; however, the role of FMT in first-line treatment settings has not been evaluated. We conducted a multicenter phase I trial combining healthy donor FMT with the PD-1 inhibitors nivolumab or pembrolizumab in 20 previously untreated patients with advanced melanoma. The primary end point was safety. No grade 3 adverse events were reported from FMT alone. Five patients (25%) experienced grade 3 immune-related adverse events from combination therapy. Key secondary end points were objective response rate, changes in gut microbiome composition and systemic immune and metabolomics analyses. The objective response rate was 65% (13 of 20), including four (20%) complete responses. Longitudinal microbiome profiling revealed that all patients engrafted strains from their respective donors; however, the acquired similarity between donor and patient microbiomes only increased over time in responders. Responders experienced an enrichment of immunogenic and a loss of deleterious bacteria following FMT. Avatar mouse models confirmed the role of healthy donor feces in increasing anti-PD-1 efficacy. Our results show that FMT from healthy donors is safe in the first-line setting and warrants further investigation in combination with immune checkpoint inhibitors. ClinicalTrials.gov identifier NCT03772899 .
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Affiliation(s)
- Bertrand Routy
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - John G Lenehan
- Department of Oncology, Western University, London, Ontario, Canada
- Lawson Health Research Institute, London, Ontario, Canada
| | - Wilson H Miller
- Lady Davis Institute of the Jewish General Hospital, Segal Cancer Centre, Montreal, Quebec, Canada
- Departments of Oncology and Medicine, McGill University, Montreal, Quebec, Canada
| | - Rahima Jamal
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Meriem Messaoudene
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Brendan A Daisley
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Cecilia Hes
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Peter Brojde Lung Cancer Center, Jewish General Hospital, Montreal, Quebec, Canada
| | - Kait F Al
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Laura Martinez-Gili
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
- Section of Bioinformatics, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, UK
| | - Michal Punčochář
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Scott Ernst
- Department of Oncology, Western University, London, Ontario, Canada
| | - Diane Logan
- Department of Oncology, Western University, London, Ontario, Canada
| | - Karl Belanger
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Hematology-Oncology Division, Department of Medicine, Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, Quebec, Canada
| | - Khashayar Esfahani
- Lady Davis Institute of the Jewish General Hospital, Segal Cancer Centre, Montreal, Quebec, Canada
- Departments of Oncology and Medicine, McGill University, Montreal, Quebec, Canada
| | - Corentin Richard
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Marina Ninkov
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
| | - Gianmarco Piccinno
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Federica Armanini
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Federica Pinto
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - Mithunah Krishnamoorthy
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada
| | - Rene Figueredo
- Department of Oncology, Western University, London, Ontario, Canada
| | - Pamela Thebault
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Panteleimon Takis
- Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, National Phenome Centre, Imperial College London, London, UK
- Section of Bioanalytical Chemistry, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK
| | - Jamie Magrill
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
| | - LeeAnn Ramsay
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
| | - Lisa Derosa
- Gustave Roussy Cancer Campus, Villejuif, France
- Cancer Medicine Department, Gustave Roussy, Villejuif, France
- Institut National de la Santé Et et de la Recherche Médicale (INSERM) U1015, ClinicObiome, Equipe Labellisée-28 Ligue Nationale contre le Cancer, Villejuif, France
- Université Paris-Saclay, Ile-de-France, France
| | - Julian R Marchesi
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
| | - Seema Nair Parvathy
- Department of Medicine, Division of Infectious Diseases, Western University, London, Ontario, Canada
- Division of Infectious Diseases, St Joseph's Health Care, London, Ontario, Canada
| | - Arielle Elkrief
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Ian R Watson
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montréal, Quebec, Canada
- Department of Biochemistry, McGill University, Montréal, Quebec, Canada
| | - Rejean Lapointe
- Research Center of the Centre Hospitalier de l'Université de Montréal, Montréal (CRCHUM), Montreal, Quebec, Canada
- Département de Médecine, Faculté de Médecine, Université de Montréal, Montréal, Quebec, Canada
| | - Nicola Segata
- Department of Computational, Cellular and Integrative Biology, University of Trento, Trento, Italy
| | - S M Mansour Haeryfar
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Department of Medicine, Division of Clinical Immunology and Allergy, Western University, London, Ontario, Canada
- Department of Surgery, Division of General Surgery, Western University, London, Ontario, Canada
| | - Benjamin H Mullish
- Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, St Mary's Hospital Campus, Imperial College London, London, UK
- Departments of Gastroenterology and Hepatology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Michael S Silverman
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Department of Medicine, Division of Infectious Diseases, Western University, London, Ontario, Canada
- Division of Infectious Diseases, St Joseph's Health Care, London, Ontario, Canada
| | - Jeremy P Burton
- Lawson Health Research Institute, London, Ontario, Canada
- Department of Microbiology & Immunology, Western University, London, Ontario, Canada
- Canadian Centre for Human Microbiome and Probiotics Research, London, Ontario, Canada
| | - Saman Maleki Vareki
- Department of Oncology, Western University, London, Ontario, Canada.
- Lawson Health Research Institute, London, Ontario, Canada.
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada.
- Department of Medical Biophysics, Western University, London, Ontario, Canada.
- Ontario Institute of Cancer Research, Toronto, Ontario, Canada.
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5
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Shahmirzadi MR, Gunaratnam L, Jevnikar AM, Luke P, House AA, Silverman MS, Hosseini-Moghaddam SM. The effect of late-onset CMV infection on the outcome of renal allograft considering initial graft function. Transpl Infect Dis 2023; 25:e14081. [PMID: 37247212 DOI: 10.1111/tid.14081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 05/10/2023] [Accepted: 05/15/2023] [Indexed: 05/30/2023]
Abstract
BACKGROUND Delayed graft function (DGF) increases the renal allograft failure risk. Late-onset Cytomegalovirus (CMV) infection's effect on the association between DGF and allograft failure has not been determined. METHODS In this retrospective cohort, we included all renal allograft recipients at London Health Sciences Centre from January 1, 2014 to December 30, 2017, and continued clinical follow-up until February 28, 2020. We determined whether late-onset CMV infection affects the association between DGF and allograft failure in stratified and Cox proportional hazard analyses. RESULTS Of 384 patients (median age [interquartile range]: 55 [43.3-63]; 38.7% female), 57 recipients (14.8%) were diagnosed with DGF. Patients with DGF were at a greater risk of CMV infection than patients without DGF (22.8% vs. 11.3%, p = .017). Late-onset CMV infection (odds ratio [OR]: 4.7, 95% CI: 2.07-10.68) and rejection (OR: 9.59, 95% CI: 4.15-22.16) significantly increased the risk of allograft failure in recipients with DGF. Patients with DGF had a significantly greater risk of graft failure than those without DGF (17.5% vs. 6.1%, p = .007). In the adjusted Cox hazard model, CMV infection significantly increased the risk of allograft failure (aHR: 3.19, 95% CI: 1.49-6.84). CONCLUSION Late-onset CMV infection considerably increased the risk of graft failure in patients with DGF. A hybrid preventive model including prophylaxis followed by CMV-specific cell-mediated immunity monitoring may decrease the risk of allograft failure in recipients with DGF.
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Affiliation(s)
- Mohammadreza R Shahmirzadi
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, Ontario, Canada
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine and Dentistry, Western University, Toronto, Ontario, Canada
| | - Lakshman Gunaratnam
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, Ontario, Canada
- Division of Nephrology, Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Anthony M Jevnikar
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Patrick Luke
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Andrew A House
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, Ontario, Canada
- Division of Nephrology, Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Michael S Silverman
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine and Dentistry, Western University, Toronto, Ontario, Canada
| | - Seyed M Hosseini-Moghaddam
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine and Dentistry, Western University, Toronto, Ontario, Canada
- Multiorgan Transplant Program, Ajmera Transplant Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
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6
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Muanda FT, Sood MM, Weir MA, Sontrop JM, Ahmadi F, Yoo E, Kim RB, Silverman MS, Knoll GA, Garg AX. Association of Higher-Dose Fluoroquinolone Therapy With Serious Adverse Events in Older Adults With Advanced Chronic Kidney Disease. JAMA Netw Open 2022; 5:e2224892. [PMID: 35917124 PMCID: PMC9346548 DOI: 10.1001/jamanetworkopen.2022.24892] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
IMPORTANCE Population-based data are needed to inform the safe prescribing of fluoroquinolone antibiotics to patients with advanced chronic kidney disease (CKD). OBJECTIVE To quantify the 14-day risk of a hospital visit with nervous system and/or psychiatric disorders, hypoglycemia, or a collagen-associated event in patients with advanced CKD newly prescribed a fluoroquinolone at a higher vs a lower dose. DESIGN, SETTING, AND PARTICIPANTS This population-based cohort study in Ontario, Canada (January 1, 2008, to March 17, 2020) used linked health care data to identify new users of fluoroquinolone antibiotics. Participants included adults 66 years or older with advanced CKD (an estimated glomerular filtration rate [eGFR] <30 mL/min/1.73 m2 but not receiving dialysis). Data analysis was performed from January 1 to April 30, 2021. EXPOSURES A new prescription for a higher-dose fluoroquinolone (ciprofloxacin, 501-1000 mg/d; levofloxacin, 501-750 mg/d; or norfloxacin, 401-800 mg/d) vs a lower-dose fluoroquinolone (ciprofloxacin, 500 mg/d; levofloxacin, 250-500 mg/d; or norfloxacin, 400 mg/d). MAIN OUTCOMES AND MEASURE The primary outcome was the 14-day risk of a hospital visit with nervous system and/or psychiatric disorders, hypoglycemia, or a collagen-associated event. Secondary outcomes included a hospital visit with sepsis, retinal detachment or other tendinopathies, all-cause hospitalization, all-cause mortality, and sudden cardiac death. Inverse probability of treatment weighting on the propensity score was used to balance comparison groups on baseline health. Weighted risk ratios and risk differences were obtained using modified Poisson regression and binomial regression, respectively. RESULTS Of 11 917 patients (median age, 83 years [IQR, 77-89 years]; 7438 women [62.4%]; median eGFR, 25 [IQR, 21-28] mL/min/1.73 m2) included in the analysis, 5482 (46.0%) received a higher-dose and 6435 (54.0%) received a lower-dose fluoroquinolone. After weighting, the primary composite outcome-a hospital visit with nervous system and/or psychiatric disorders, hypoglycemia, or a collagen-associated event-occurred in 68 of 5482 patients (1.2%) treated with a higher-dose fluoroquinolone and in 47 of 5516 (0.9%) treated with a lower-dose fluoroquinolone (weighted risk ratio, 1.45 [95% CI, 1.01-2.08]; weighted risk difference, 0.39% [95% CI, 0.01%-0.76%]). The risk of sepsis, retinal detachment, all-cause hospitalization, all-cause mortality, and sudden cardiac death did not differ significantly between groups. CONCLUSIONS AND RELEVANCE These findings suggest that older patients with advanced CKD who were prescribed a fluoroquinolone at a higher-than-recommended dose were significantly more likely to experience the composite outcome of a hospital visit with nervous system and/or psychiatric disorders, hypoglycemia, or a collagen-associated event, although the absolute risk of these events was less than 2%.
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Affiliation(s)
- Flory Tsobo Muanda
- ICES Western, Victoria Hospital, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | - Manish M. Sood
- ICES Western, Victoria Hospital, London, Ontario, Canada
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Matthew A. Weir
- ICES Western, Victoria Hospital, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
- Division of Nephrology, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Jessica M. Sontrop
- Division of Nephrology, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Fatemeh Ahmadi
- ICES Western, Victoria Hospital, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | - Elisa Yoo
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | - Richard B. Kim
- Division of Clinical Pharmacology, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Michael S. Silverman
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Gregory A. Knoll
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Amit X. Garg
- ICES Western, Victoria Hospital, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
- Division of Nephrology, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
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7
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Al KF, Craven LJ, Gibbons S, Parvathy SN, Wing AC, Graf C, Parham KA, Kerfoot SM, Wilcox H, Burton JP, Kremenchutzky M, Morrow SA, Casserly C, Meddings J, Sharma M, Silverman MS. Fecal microbiota transplantation is safe and tolerable in patients with multiple sclerosis: A pilot randomized controlled trial. Mult Scler J Exp Transl Clin 2022; 8:20552173221086662. [PMID: 35571974 PMCID: PMC9102167 DOI: 10.1177/20552173221086662] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 02/22/2022] [Indexed: 01/04/2023] Open
Abstract
Background Patients with MS have an altered gut microbiota compared to healthy individuals, as well as elevated small intestinal permeability, which may be contributing to the development and progression of the disease. Objective We sought to investigate if fecal microbiota transplantation was safe and tolerable in MS patients and if it could improve abnormal intestinal permeability. Methods Nine patients with MS were recruited and provided monthly FMTs for up to six months. The primary outcome investigated was change in peripheral blood cytokine concentrations. The secondary outcomes were gut microbiota composition, intestinal permeability, and safety (assessed with EDSS and MRI). Results The study was terminated early and was subsequently underpowered to assess whether peripheral blood cytokines were altered following FMTs. FMTs were safe in this group of patients. Two of five patients had elevated small intestinal permeability at baseline that improved to normal values following FMTs. Significant, donor-specific, beneficial alterations to the MS patient gut microbiota were observed following FMT. Conclusion FMT was safe and tolerable in this cohort of RRMS patients, may improve elevated small intestinal permeability, and has the potential to enrich for an MS-protective microbiota. Further studies with longer follow-up and larger sample sizes are required to determine if FMT is a suitable therapy for MS.
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Affiliation(s)
| | | | - Shaeley Gibbons
- Department of Microbiology and Immunology, Western University, London, ON, Canada
| | | | - Ana Christina Wing
- Department of Neurology, London Health Sciences Centre, London, ON, Canada
| | - Chantelle Graf
- Division of Infectious Diseases, Western University, London, ON, Canada
| | | | | | - Hannah Wilcox
- Department of Microbiology and Immunology, Western University, London, ON, Canada
| | - Jeremy P Burton
- Department of Microbiology and Immunology, Western University, London, ON, Canada
- Lawson Health Research Institute, London, ON, Canada
- Division of Urology, Department of Surgery, St Joseph’s Health Care, Western University, London, ON, Canada
| | | | | | - Courtney Casserly
- Department of Neurology, London Health Sciences Centre, London, ON, Canada
| | - Jon Meddings
- Division of Gastroenterology, University of Calgary, Calgary, AB, Canada
| | - Manas Sharma
- Department of Radiology, Western University, London, ON, Canada
| | - Michael S. Silverman
- Michael Silverman, Division of Infectious Diseases, Western University, 268 Grosvenor Street, London, ON, Canada N6A 4V2.
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8
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Berkane S, Harizi I, Tayebi A, Silverman MS, Stranges S. Should We Delay the Second COVID-19 Vaccine Dose in Order to Optimize Rollout? A Mathematical Perspective. Int J Public Health 2022; 66:1604312. [PMID: 35140580 PMCID: PMC8820268 DOI: 10.3389/ijph.2021.1604312] [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] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 12/22/2021] [Indexed: 11/22/2022] Open
Abstract
Objectives: With vaccination shortage persisting in many countries, adopting an optimal vaccination program is of crucial importance. Given the slow pace of vaccination campaigns globally, a very relevant and burning public health question is whether it is better to delay the second COVID-19 vaccine shot until all priority group people have received at least one shot. Currently, many countries are looking to administer a third dose (booster shot), which raises the question of how to distribute the available daily doses to maximize the effectively vaccinated population. Methods: We formulate a generalized optimization problem with a total of uT=∑i=1nui vaccine doses, that have to be optimally distributed between n different sub-populations, where sub-population ui represents people receiving the ith dose of the vaccine with efficacy αi. The particular case where n = 2 is solved first, followed by the general case of n dose regimen. Results: In the case of a two dose regimen, if the efficacy of the second dose is less than (or equal to) twice the efficacy of the first dose, the optimal strategy to maximize the number of effectively vaccinated people is to delay the second vaccine as much as possible. Otherwise, the optimal strategy would consist of administering the second dose as quickly as possible. In the general case, the optimal vaccination strategy would be to administer the k − th dose corresponding to the index providing the maximum inter-dose efficacy difference (αi − αi−1) for all possible values of i ∈ {1, … , n}, with α0 = 0. Conclusion: Our results suggest that although extending the interval between doses beyond 12 weeks was likely optimal earlier in the pandemic, the reduced single dose efficacy of vaccines against the delta variant make this approach no longer viable.
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Affiliation(s)
- Soulaimane Berkane
- Département d’informatique et d’ingénierie, Université du Québec Outaouais, Gatineau, QC, Canada
- Department of Electrical Engineering, Lakehead University, Thunder Bay, ON, Canada
- *Correspondence: Soulaimane Berkane,
| | | | - Abdelhamid Tayebi
- Department of Electrical Engineering, Lakehead University, Thunder Bay, ON, Canada
- Department of Electrical and Computer Engineering, Faculty of Engineering, Western University, London, ON, Canada
| | - Michael S. Silverman
- Department of Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
- Department of Family Medicine, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
| | - Saverio Stranges
- Department of Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
- Department of Family Medicine, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
- Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada
- Department of Population Health, Luxembourg Institute of Health, Strassen, Luxembourg
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9
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Hosseini-Moghaddam SM, Luo B, Bota SE, Husain S, Silverman MS, Daneman N, Brown KA, Paterson JM. Incidence and Outcomes Associated With Clostridioides difficile Infection in Solid Organ Transplant Recipients. JAMA Netw Open 2021; 4:e2141089. [PMID: 34964852 PMCID: PMC8717111 DOI: 10.1001/jamanetworkopen.2021.41089] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
IMPORTANCE Little is known about the incidence and outcomes of Clostridioides difficile infection (CDI) in solid organ transplant (SOT) recipients. OBJECTIVE To estimate the CDI incidence and outcomes in SOT recipients. DESIGN, SETTING, AND PARTICIPANTS A population-based cohort study was conducted using administrative health care data for all Ontario, Canada, residents who received organ allografts from April 1, 2003, to December 31, 2017; March 31, 2020, was the end of the study period. MAIN OUTCOMES AND MEASURES The primary outcome was hospital admission with CDI diagnosis. The secondary outcomes included all-cause death, intensive care unit admission, acute kidney injury requiring dialysis, and fulminant CDI comprising any of the following: toxic megacolon, ileus, perforation, or colectomy. The association between short- vs long-term mortality (ie, death occurring within or after 90 days post-CDI) and the following variables was evaluated: age, sex, Deyo-Charlson Comorbidity Index, SOT type, early- vs late-onset CDI, fulminant CDI, intensive care unit admission, and acute kidney injury requiring acute dialysis. RESULTS Overall, 10 724 SOT recipients (6901 [64.4%] men; median age, 54 [IQR, 44-62] years) were eligible. Kidney transplant was the most common SOT type (6453 [60.2%]). The median follow-up time was 5.0 (IQR, 2.3-8.8) years, resulting in 61 987 person-years of follow-up. A total of 726 patients (6.8%) were hospitalized with CDI. The 1-year CDI incidence significantly increased in annual cohorts (ie, from 23.1; 95% CI, 12.8-41.8 per 1000 person-years in 2004 to 46.7; 95% CI, 35.0-62.3 per 1000 person-years in 2017; P = .001). Clostridioides difficile was associated with a 16.8% rate (n = 122) of 90-day mortality. In patients who underwent kidney transplant, CDI was typically late-onset (median interval, 2.2; IQR, 0.4-6.0 years) compared with recipients of other organs. Acute kidney injury requiring dialysis was significantly associated with short-term (adjusted odds ratio [aOR], 1.86; 95% CI, 1.07-3.26) and long-term (adjusted hazard ratio [aHR], 1.89; 95% CI, 1.29-2.78) mortality, and late-onset CDI was also significantly associated with a greater risk of short-term (aOR, 4.26; 95% CI, 2.51-7.22) and long-term (aHR, 2.49; 95% CI, 1.78-3.49) mortality. CONCLUSIONS AND RELEVANCE In this study, increasing CDI trends in annual cohorts of SOT recipients were observed. Posttransplant CDI was associated with mortality, and late-onset CDI was associated with a greater risk of death than early-onset CDI. These findings suggest that preventive strategies should not be limited to the initial months following transplantation. Comprehensive therapeutic approaches targeting acute kidney injury risk factors in SOT recipients may reduce short- and long-term post-CDI mortality.
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Affiliation(s)
- Seyed M. Hosseini-Moghaddam
- ICES, Ontario, Canada
- Multiorgan Transplant Program, University Health Network, University of Toronto, Toronto, Ontario, Canada
- Division of Infectious Diseases, Department of Medicine, Western University, London, Ontario, Canada
| | | | | | - Shahid Husain
- Multiorgan Transplant Program, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | - Michael S. Silverman
- Division of Infectious Diseases, Department of Medicine, Western University, London, Ontario, Canada
| | - Nick Daneman
- ICES, Ontario, Canada
- Sunnybrook Health Sciences Center, University of Toronto, Toronto, Ontario, Canada
- Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, Ontario, Canada
- Public Health Ontario, Toronto, Ontario, Canada
| | - Kevin A. Brown
- ICES, Ontario, Canada
- Public Health Ontario, Toronto, Ontario, Canada
- Dalla Lana School of Public Health, Toronto, Ontario, Canada
| | - J. Michael Paterson
- ICES, Ontario, Canada
- Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, Ontario, Canada
- Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
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10
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Shojaei E, Walsh JC, Sangle N, Yan B, Silverman MS, Hosseini-Moghaddam SM. Gastrointestinal Histoplasmosis Mimicking Crohn's Disease. Open Forum Infect Dis 2021; 8:ofab249. [PMID: 34262987 PMCID: PMC8274358 DOI: 10.1093/ofid/ofab249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/10/2021] [Accepted: 05/13/2021] [Indexed: 11/13/2022] Open
Abstract
Disseminated histoplasmosis is a life-threatening disease usually seen in immunocompromised patients living in endemic areas. We present an apparently immunocompetent patient with gastrointestinal histoplasmosis who was initially diagnosed with biopsy-proven Crohn's disease. Following discontinuation of anti-inflammatory drugs and institution of antifungal therapy, his gastrointestinal illness completely improved. Specific fungal staining should be routinely included in histopathologic assessment of tissue specimens diagnosed as Crohn's disease.
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Affiliation(s)
- Esfandiar Shojaei
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Joanna C Walsh
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Nikhil Sangle
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Brian Yan
- Division of Gastroenterology, Department of Medicine, Schulich School of Medicine & Dentistry, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Michael S Silverman
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Seyed M Hosseini-Moghaddam
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
- Division of Infectious Diseases, Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada
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11
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Rahimishahmirzadi M, Jevnikar AM, House AA, Luke PP, Humar A, Silverman MS, Shalhoub SM, Hosseini-Moghaddam SM. Late-onset allograft rejection, cytomegalovirus infection, and renal allograft loss: Is anti-CMV prophylaxis required following late-onset allograft rejection? Clin Transplant 2021; 35:e14285. [PMID: 33713374 DOI: 10.1111/ctr.14285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 12/17/2020] [Revised: 02/09/2021] [Accepted: 03/08/2021] [Indexed: 11/29/2022]
Abstract
Renal transplant recipients remain at risk of delayed-onset cytomegalovirus (CMV) infection occurring beyond a complete course of prophylaxis. In this retrospective cohort, all 278 patients who received renal allografts from deceased donors from 2014 to 2016 were followed until September 1, 2019. We determined the effect of early-vs late-onset acute rejection (EAR vs LAR [ie, occurring beyond 12 months after transplantation]) on CMV infection and subsequently long-term allograft outcome. Median (IQR) duration of follow-up was 1186.0 (904.7-1531.2) days. Seventy patients including 49 patients with EAR and 21 with LAR received augmented immunosuppression. In the same interval, 40 patients developed CMV infection (36 patients beyond 90 days after transplantation [90%]). In logistic regression analysis, D+/R- CMV serostatus (OR: 5.5, 95% CI: 2.5-12.2) and LAR (OR: 7.9, 95% CI: 2.8-22.2) significantly increased the risk of CMV infection. In Cox proportional hazard model, delayed-onset CMV infection (HR: 2.51, 95% CI: 1.08-5.86) and LAR (HR: 5.46, 95% CI: 2.26-13.14) significantly increased the risk of allograft loss. Patients with LAR are at risk of late-onset CMV infection. Post-LAR, targeted prophylaxis may reduce the risk of CMV infection and subsequently allograft loss. Further studies are required to demonstrate the effect of targeted prophylaxis following LAR.
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Affiliation(s)
| | - Anthony M Jevnikar
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, ON, Canada
| | - Andrew A House
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, ON, Canada
| | - Patrick P Luke
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, ON, Canada
| | - Atul Humar
- Division of Infectious Diseases, Transplant Infectious Diseases Program, University Health Network, Toronto, ON, Canada.,Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Michael S Silverman
- Division of Infectious Diseases, Department of Medicine, Western University, London, ON, Canada
| | - Sarah M Shalhoub
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, ON, Canada.,Division of Infectious Diseases, Department of Medicine, Western University, London, ON, Canada
| | - Seyed M Hosseini-Moghaddam
- Multiorgan Transplant Program, London Health Sciences Centre, Western University, London, ON, Canada.,Division of Infectious Diseases, Department of Medicine, Western University, London, ON, Canada.,Division of Infectious Diseases, Transplant Infectious Diseases Program, University Health Network, Toronto, ON, Canada.,Department of Medicine, University of Toronto, Toronto, ON, Canada
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12
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Grattan KS, Mohamed Ali M, Hosseini-Moghaddam SM, Gilmour HJI, Crunican GP, Hua E, Muhsin KA, Johnstone R, Bondy LC, Devlin MK, Shalhoub S, Elsayed S, Silverman MS. Evaluating the safety and effectiveness of a nurse-led outpatient virtual IV vancomycin monitoring clinic: a retrospective cohort study. JAC Antimicrob Resist 2021; 3:dlaa113. [PMID: 34223065 PMCID: PMC8210185 DOI: 10.1093/jacamr/dlaa113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/12/2020] [Accepted: 11/17/2020] [Indexed: 01/04/2023] Open
Abstract
Background Outpatient parenteral antimicrobial therapy (OPAT) with vancomycin is a common treatment modality for certain Gram-positive infections. Data regarding the safety of various models of delivery are limited. Objectives To review outcomes of a nurse-led OPAT vancomycin monitoring service. Methods This was a retrospective cohort study of consecutive patients referred to a nurse-led OPAT vancomycin clinic from December 2015 to March 2018. Patients were administered IV vancomycin in the home with active laboratory monitoring of vancomycin trough levels, renal function and complete blood count using an integrated electronic database linked with community laboratories (virtual vancomycin clinic, VVC). Monitoring was coordinated by nurses with physician approval of recommended dosing changes. Data were extracted from the electronic medical record. Demographics; clinical indication; microbial aetiology; culture source; antimicrobial regimen(s); serum creatinine and vancomycin trough values; initiation, discharge and completion dates; hospitalizations; adverse events; and outcomes were all evaluated. Results Two hundred and seventy-five patients underwent a total of 301 courses of OPAT with vancomycin; 285 courses were completed. The rate of treatment discontinuation due to adverse effects was 33/301 (11.0%), with 15/33 (45.5%) being due to renal adverse effects (15/301 [5.0%] of episodes). Two of 15 (18.2%) patients developed stage 2 acute kidney injury (AKI), and no patients had stage 3 AKI or required haemodialysis. Nine of 301 (3.0%) required readmission for treatment failure. Nursing costs associated with monitoring were $63.93 CAD/patient ($48.43 USD). Conclusions A nurse-led VVC was a safe, effective and inexpensive modality for administering outpatient vancomycin.
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Affiliation(s)
| | | | | | | | | | - Erica Hua
- St Joseph's Health Care, London, Ontario, Canada
| | | | | | - Lise C Bondy
- St Joseph's Health Care, London, Ontario, Canada
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13
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Ouyang J, Isnard S, Lin J, Fombuena B, Peng X, Nair Parvathy S, Chen Y, Silverman MS, Routy JP. Treating From the Inside Out: Relevance of Fecal Microbiota Transplantation to Counteract Gut Damage in GVHD and HIV Infection. Front Med (Lausanne) 2020; 7:421. [PMID: 32850913 PMCID: PMC7423874 DOI: 10.3389/fmed.2020.00421] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 04/15/2020] [Accepted: 06/30/2020] [Indexed: 12/12/2022] Open
Abstract
The gastrointestinal (GI) tract is a complex and well-balanced milieu of anatomic and immunological barriers. The epithelial surface of the GI tract is colonized by trillions of microorganisms, known as the gut microbiota, which is considered an “organ” with distinctive endocrine and immunoregulatory functions. Dysregulation of the gut microbiota composition, termed dysbiosis, has been associated with epithelial damage and translocation of microbial products into the circulating blood. Dysbiosis, increased gut permeability and chronic inflammation play a major role on the clinical outcome of inflammatory bowel diseases, graft-vs.-host disease (GVHD) and HIV infection. In this review, we focus on GVHD and HIV infection, conditions sharing gut immune damage leading to dysbiosis. The degree of dysbiosis and level of epithelial gut damage predict poor clinical outcome in both conditions. Emerging interventions are therefore warranted to promote gut microbiota homeostasis and improve intestinal barrier function. Interventions such as anti-inflammatory medications, and probiotics have toxicity and/or limited transitory effects, justifying innovative approaches. Fecal microbiota transplantation (FMT) is one such approach where fecal microorganisms are transferred from healthy donors into the GI tract of the recipient to restore microbiota composition in patients with Clostridium difficile-induced colitis or inflammatory bowel diseases. Preliminary findings point toward a beneficial effect of FMT to improve GVHD and HIV-related outcomes through the engraftment of beneficial donor bacteria, notably those producing anti-inflammatory metabolites. Herein, we critically review the potential for FMT in alleviating dysbiosis and gut damage in patients with GVHD or HIV-infection. Understanding the underlying mechanism by which FMT restores gut function will pave the way toward novel scalable and targeted interventions.
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Affiliation(s)
- Jing Ouyang
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada.,Chongqing Public Health Medical Center, Chongqing, China
| | - Stéphane Isnard
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada
| | - John Lin
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada
| | - Brandon Fombuena
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada.,Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - Xiaorong Peng
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, College of Medicine, The First Affiliated Hospital, Zhejiang University, Hangzhou, China
| | | | - Yaokai Chen
- Chongqing Public Health Medical Center, Chongqing, China
| | | | - Jean-Pierre Routy
- Infectious Diseases and Immunity in Global Health Program, McGill University Health Centre, Research Institute, Montreal, QC, Canada.,Chronic Viral Illness Service, McGill University Health Centre, Montreal, QC, Canada.,Division of Hematology, McGill University Health Centre, Montreal, QC, Canada
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Meyer M, Bondy L, Koivu S, Koval J, Scarffe AD, Silverman MS. New hepatitis C diagnoses in Ontario, Canada are associated with the local prescription patterns of a controlled-release opioid. J Viral Hepat 2020; 27:774-780. [PMID: 32187428 DOI: 10.1111/jvh.13292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 02/22/2020] [Accepted: 02/26/2020] [Indexed: 01/27/2023]
Abstract
Increases in acute hepatitis C virus (HCV) incidence may be a result of the rising prevalence of injection drug use and the opioid epidemic. Among persons who inject drugs, sharing of needles/syringes is less common and leads to a smaller proportion of incident cases than does sharing of injection drug preparation equipment. In Canada and Europe, hydromorphone controlled release has been associated with frequent reuse and sharing of IDPE. Drug excipients within HCR have been shown to preserve virus survival within IDPE. We hypothesized that regional differences in HCV incidence would mirror regional differences in HCR prescribing. We reviewed HCV incidence data across Ontario, Canada for 2016. Opioid prescribing patterns in each Health Unit were reviewed. Multivariable Poisson regression analyses were performed to test the strength of hydromorphone controlled release dispensing patterns in explaining HCV incidence compared to all opioids. Less vehicle access, lack of education, lower income, less population density, higher white race/ethnicity and more opioid substitution therapy recipients remained significant positive predictors of hepatitis C incidence in the Ontario model. Higher hydromorphone controlled release dispensing rate was a stronger predictor of HCV incidence than all opioid prescriptions (standardized risk ratio = 1.17, P < .0001 vs sRR = 1.11, P = .02). When hydromorphone controlled release was excluded from the opioid prescription variable, dispensing patterns of all other opioids no longer remained a significant predictor (sRR = 1.042, P = .34). The observed relationship between HCV incidence and hydromorphone controlled release dispensing suggests that the type of opioid prescribed locally may contribute to variations in HCV incidence. These data add support to evidence that hydromorphone controlled release use is contributing to HCV spread in Ontario.
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Affiliation(s)
- Matthew Meyer
- London Health Sciences Centre, London, ON, Canada.,Department of Epidemiology and Biostatistics, Western University, London, ON, Canada.,Ivey International Centre for Health Innovation, Ivey Business School, Western University, London, ON, Canada
| | - Lise Bondy
- Division of Infectious Diseases, Western University, London, ON, Canada
| | - Sharon Koivu
- Department of Family Practice, Western University, London, ON, Canada
| | - John Koval
- Department of Epidemiology and Biostatistics, Western University, London, ON, Canada
| | - Andrew D Scarffe
- Ivey International Centre for Health Innovation, Ivey Business School, Western University, London, ON, Canada.,Telfer School of Management, University of Ottawa, Ottawa, ON, Canada
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15
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Abstract
Renal echinococcal infection is an uncommonly encountered infection in North America but is endemic in many parts of the world. With increasing migration, it is conceivable that practicing Canadian physicians will see more patients presenting at various stages of infection. Herein, we describe an unusual presentation of primary renal echinococcal infection and describe current diagnostic, as well as medical and surgical management strategies.
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Affiliation(s)
- Jennifer Bjazevic
- Division of Urology, Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Dor Golomb
- Division of Urology, Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Michael S Silverman
- Division of Infections Diseases, Department of Medicine, University of Western Ontario, London, ON, Canada
| | - Stephen E Pautler
- Division of Urology, Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Hassan Razvi
- Division of Urology, Department of Surgery, University of Western Ontario, London, ON, Canada
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16
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Ball LJ, Venner C, Tirona RG, Arts E, Gupta K, Wiener JC, Koivu S, Silverman MS. Heating Injection Drug Preparation Equipment Used for Opioid Injection May Reduce HIV Transmission Associated With Sharing Equipment. J Acquir Immune Defic Syndr 2020; 81:e127-e134. [PMID: 31021987 PMCID: PMC6905404 DOI: 10.1097/qai.0000000000002063] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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] [Indexed: 11/29/2022]
Abstract
Supplemental Digital Content is Available in the Text. Background: London, Canada, experienced an HIV outbreak among persons who inject drugs despite widespread distribution of harm reduction equipment. Hydromorphone controlled-release (HMC) is the local opioid of choice. Injection drug preparation equipment (IDPE; ie, cookers and filters) is often shared and reused because of the perception that there is residual HMC in the IDPE after use. The purpose of this study was to investigate the mechanisms of HIV transmission in this context. Methods: Residual hydromorphone, (controlled-release or immediate-release), remaining in the IDPE, was measured with liquid chromatography–tandem mass spectrometry, in conditions replicating persons who inject drug use. HIV was added to IDPE in the presence HMC, hydromorphone immediate-release, or microcrystalline cellulose (an HMC drug excipient). HIV viral persistence was measured by reverse transcriptase activity and infectivity of indicator Tzm-bl cells. Results: Forty-five percent of HMC remained in the IDPE after the first aspiration of solution, with no change after heating. HIV persistence and infectivity were preserved in the presence of HMC, and less so with microcrystalline cellulose. Heating the IDPE rapidly inactivated HIV. Conclusions: Sharing of IDPE is a potential means of HIV transmission. HMC encourages IDPE sharing because of the residual drug in the IDPE, and the HMC excipients preserve HIV viability. Heating IDPE before aspiration of the opioid may be a harm reduction strategy.
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Affiliation(s)
| | | | | | | | | | - Joshua C Wiener
- Epidemiology and Biostatistics, Western University, Ontario, Canada
| | - Sharon Koivu
- Department of Family Medicine, The Western Centre for Public Health and Family MedicineSchulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
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17
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Isnard S, Ramendra R, Dupuy FP, Lin J, Fombuena B, Kokinov N, Kema I, Jenabian MA, Lebouché B, Costiniuk CT, Ancuta P, Bernard NF, Silverman MS, Lakatos PL, Durand M, Tremblay C, Routy JP. Plasma Levels of C-Type Lectin REG3α and Gut Damage in People With Human Immunodeficiency Virus. J Infect Dis 2020; 221:110-121. [PMID: 31504638 PMCID: PMC6910878 DOI: 10.1093/infdis/jiz423] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [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: 06/06/2019] [Accepted: 08/14/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Regenerating islet-derived protein 3α (REG3α) is an antimicrobial peptide secreted by intestinal Paneth cells. Circulating REG3α has been identified as a gut damage marker in inflammatory bowel diseases. People living with human immunodeficiency virus (PWH) on antiretroviral therapy (ART) present with an abnormal intestinal landscape leading to microbial translocation, persistent inflammation, and development of non-AIDS comorbidities. Herein, we assessed REG3α as a marker of gut damage in PWH. METHODS Plasma from 169 adult PWH, including 30 elite controllers (ECs), and 30 human immunodeficiency virus (HIV)-uninfected controls were assessed. REG3α plasma levels were compared with HIV disease progression, epithelial gut damage, microbial translocation, and immune activation markers. RESULTS Cross-sectionally, REG3α levels were elevated in untreated and ART-treated PWH compared with controls. ECs also had elevated REG3α levels compared to controls. Longitudinally, REG3α levels increased in PWH without ART and decreased in those who initiated ART. REG3α levels were inversely associated with CD4 T-cell count and CD4:CD8 ratio, while positively correlated with HIV viral load in untreated participants, and with fungal product translocation and inflammatory markers in all PWH. CONCLUSIONS Plasma REG3α levels were elevated in PWH, including ECs. The gut inflammatory marker REG3α may be used to evaluate therapeutic interventions and predict non-AIDS comorbidity risks in PWH.
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Affiliation(s)
- Stéphane Isnard
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Rayoun Ramendra
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
| | - Franck P Dupuy
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - John Lin
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Brandon Fombuena
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
| | - Nikola Kokinov
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Ido Kema
- Department of Laboratory Medicine, University Medical Center, University of Groningen, The Netherlands
| | - Mohammad-Ali Jenabian
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
- Department of Biological Sciences, University of Quebec at Montreal, Montreal, Quebec, Canada
- Département de microbiologie, infectiologie et immunologie, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Bertrand Lebouché
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Cecilia T Costiniuk
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Petronela Ancuta
- Centre de recherche du Centre Hospitalier de l’Université de Montréal, Montreal, Quebec, Canada
- Département de microbiologie, infectiologie et immunologie, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Nicole F Bernard
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
- Department of Medicine, McGill University, Montreal, Quebec, Canada
- Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Michael S Silverman
- Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, Western University, London, Ontario
| | - Peter L Lakatos
- Division of Gastroenterology and Hepatology, McGill University Health Centre, McGill University Health Centre, Montreal, Quebec, Canada
| | - Madeleine Durand
- Centre de recherche du Centre Hospitalier de l’Université de Montréal, Montreal, Quebec, Canada
| | - Cécile Tremblay
- Centre de recherche du Centre Hospitalier de l’Université de Montréal, Montreal, Quebec, Canada
- Département de microbiologie, infectiologie et immunologie, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Jean-Pierre Routy
- Infectious Diseases and Immunity in Global Health Program, Research Institute, McGill University, Montreal, Quebec, Canada
- Chronic Viral Illness Service, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
- Division of Hematology, McGill University Health Centre, Montreal, Quebec, Canada
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Kasper KJ, Manoharan I, Hallam B, Coleman CE, Koivu SL, Weir MA, Delport J, McCormick JK, Silverman MS. Correction: A controlled-release oral opioid supports S. aureus survival in injection drug preparation equipment and may increase bacteremia and endocarditis risk. PLoS One 2019; 14:e0223079. [PMID: 31536590 PMCID: PMC6752826 DOI: 10.1371/journal.pone.0223079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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19
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Kasper KJ, Manoharan I, Hallam B, Coleman CE, Koivu SL, Weir MA, McCormick JK, Silverman MS. A controlled-release oral opioid supports S. aureus survival in injection drug preparation equipment and may increase bacteremia and endocarditis risk. PLoS One 2019; 14:e0219777. [PMID: 31398210 PMCID: PMC6688832 DOI: 10.1371/journal.pone.0219777] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 11/25/2018] [Accepted: 07/01/2019] [Indexed: 02/06/2023] Open
Abstract
Background Injection drug use-associated endocarditis (IDUaIE) incidence in Ontario has recently been associated with hydromorphone prescribing rates. Staphylococcus aureus causes the majority of cases of IDUaIE in Ontario and across North America. Hydromorphone controlled-release (Hydromorphone-CR) requires a complex technique for injection and therefore provides multiple opportunities for contamination. Hydromorphone-CR contains several excipients, which could enhance staphylococcal survival and increase risk of contaminating the injectate. Methods Used injection drug preparation equipment (cookers/filters) was collected from persons who inject drugs (PWID), rinsed with water, and plated on Mannitol salt agar. Bacterial isolates from bacteremic PWID were used to assess the survival of S. aureus and Streptococcus pyogenes on cookers/filters with Hydromorphone-CR, hydromorphone immediate-release (Hydromorphone-IR) or oxycodone controlled-release (Oxycodone-CR). The solutions spiked with S. aureus were heated and the remaining viable bacteria enumerated. Results S. aureus was detected in 12/87 (14%, 95%CI 8–23%) cookers/filters samples used for injection of Hydromorphone-CR. Hydromorphone-CR was the only opioid associated with greater survival of methicillin-sensitive S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA) on cookers/filters when compared to sterile water vehicle control. There was a ~2 log reduction in the number of S. aureus that survived when cookers/filters were heated. Conclusion 14% of all cookers/filters used in the preparation of Hydromorphone-CR were contaminated with S. aureus. Hydromorphone-CR prolongs the survival of MRSA and MSSA in cookers/filters. Heating cookers/filters may be a harm-reduction strategy.
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Affiliation(s)
- Katherine J. Kasper
- Department of Microbiology and Immunology, Western University, London, Canada
| | | | - Brian Hallam
- Department of Epidemiology and Biostatistics, Western University, London, Canada
| | | | - Sharon L. Koivu
- Department of Family Medicine, Western University, London, Canada
| | - Matthew A. Weir
- Department of Medicine, Western University, London, Canada
- Lawson Health Research Institute, London, Canada
| | - John K. McCormick
- Department of Microbiology and Immunology, Western University, London, Canada
- Lawson Health Research Institute, London, Canada
| | - Michael S. Silverman
- Department of Microbiology and Immunology, Western University, London, Canada
- Department of Medicine, Western University, London, Canada
- Lawson Health Research Institute, London, Canada
- Division of Infectious Diseases, Western University, London, Canada
- * E-mail:
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20
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Craven LJ, Nair Parvathy S, Tat-Ko J, Burton JP, Silverman MS. Extended Screening Costs Associated With Selecting Donors for Fecal Microbiota Transplantation for Treatment of Metabolic Syndrome-Associated Diseases. Open Forum Infect Dis 2017; 4:ofx243. [PMID: 29255739 PMCID: PMC5730934 DOI: 10.1093/ofid/ofx243] [Citation(s) in RCA: 35] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/02/2017] [Indexed: 11/22/2022] Open
Abstract
Background Knowledge of the impact of the gut microbiome on conditions other than Clostridium difficile infection has been rapidly increasing, and the potential usefulness of fecal microbiota transplantation (FMT) in these indications is being explored. The need to exclude donors with an increased risk of these diseases has left uncertainties regarding the cost and feasibility of donor screening. The aim of this study was to compare our experience to other donor-screening programs and report the costs associated with establishing a donor-screening program, for the treatment of metabolic syndrome-related conditions. Methods Forty-six potential donors (PDs) had their medical histories and physical examinations undertaken by a physician. Blood, stool, and urine were screened for 31 viral, bacterial, fungal, and protozoan agents in addition to biochemical characteristics. The price of advertising, doctor’s visits and diagnostic tests were calculated to determine the cost of finding a donor. Results Of the PDs screened, 5 of 46 passed the history, examination, blood, stool, and urine tests. The most common reasons for exclusion included a body mass index >25 or the detection of Blastocystis hominis, Dientamoeba fragilis, or Helicobacter pylori. Four of five eligible donors had subsequent travel or illness that contraindicated donation, so only 1 of 46 PDs was suitable. The total cost for finding a single suitable donor was $15190 US dollars. This screening was performed in Canada, and costs in the United States would be substantially higher. Conclusions New potential therapeutic uses for FMT have created a demand for stricter exclusion criteria for donors. This study illustrates that screening many individuals to find a donor and the subsequent associated costs may make central processing and shipment a more reasonable alternative.
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Affiliation(s)
- Laura J Craven
- Department of Microbiology and Immunology, London, Ontario, Canada.,Lawson Health Research Institute, London, Ontario, Canada
| | - Seema Nair Parvathy
- Department of Infectious Disease, St. Joseph's Health Care, London, Ontario, Canada
| | - Justin Tat-Ko
- Department of Microbiology and Immunology, London, Ontario, Canada
| | - Jeremy P Burton
- Department of Microbiology and Immunology, London, Ontario, Canada.,Division of Urology, Department of Surgery, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.,Lawson Health Research Institute, London, Ontario, Canada
| | - Michael S Silverman
- Department of Microbiology and Immunology, London, Ontario, Canada.,Lawson Health Research Institute, London, Ontario, Canada.,Department of Infectious Disease, St. Joseph's Health Care, London, Ontario, Canada
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Craw LA, Saunders NR, Koelink E, Roth J, Aronson L, Silverman MS, Roth S, Ortuoste B, Scolnik D. Anthropometric Measurement of School-Aged Children in Guyana, South America. Paediatr Child Health 2010. [DOI: 10.1093/pch/15.suppl_a.56ab] [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: 11/12/2022] Open
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22
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Silverman MS, Davis I, Pillai DR. Success of self-administered home fecal transplantation for chronic Clostridium difficile infection. Clin Gastroenterol Hepatol 2010; 8:471-3. [PMID: 20117243 DOI: 10.1016/j.cgh.2010.01.007] [Citation(s) in RCA: 147] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 12/23/2009] [Accepted: 01/12/2010] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Clostridium difficile infection (CDI) can relapse in patients with significant comorbidities. A subset of these patients becomes dependent on oral vancomycin therapy for prolonged periods with only temporary clinical improvement. These patients incur significant morbidity from recurrent diarrhea and financial costs from chronic antibiotic therapy. METHODS We sought to investigate whether self- or family-administered fecal transplantation by low volume enema could be used to definitively treat refractory CDI. RESULTS We report a case series (n = 7) where 100% clinical success was achieved in treating these individuals with up to 14 months of follow-up. CONCLUSIONS Fecal transplantation by low volume enema is an effective and safe option for patients with chronic relapsing CDI, refractory to other therapies. Making this approach available in health care settings has the potential to dramatically increase the number of patients who could benefit from this therapy.
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Loutfy MR, Hart TA, Mohammed SS, Su D, Ralph ED, Walmsley SL, Soje LC, Muchenje M, Rachlis AR, Smaill FM, Angel JB, Raboud JM, Silverman MS, Tharao WE, Gough K, Yudin MH. Fertility desires and intentions of HIV-positive women of reproductive age in Ontario, Canada: a cross-sectional study. PLoS One 2009; 4:e7925. [PMID: 19997556 PMCID: PMC2785467 DOI: 10.1371/journal.pone.0007925] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Accepted: 10/20/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Improvements in life expectancy and quality of life for HIV-positive women coupled with reduced vertical transmission will likely lead numerous HIV-positive women to consider becoming pregnant. In order to clarify the demand, and aid with appropriate health services planning for this population, our study aims to assess the fertility desires and intentions of HIV-positive women of reproductive age living in Ontario, Canada. METHODOLOGY/PRINCIPAL FINDINGS A cross-sectional study with recruitment stratified to match the geographic distribution of HIV-positive women of reproductive age (18-52) living in Ontario was carried out. Women were recruited from 38 sites between October 2007 and April 2009 and invited to complete a 189-item self-administered survey entitled "The HIV Pregnancy Planning Questionnaire" designed to assess fertility desires, intentions and actions. Logistic regression models were fit to calculate unadjusted and adjusted odds ratios of significant predictors of fertility intentions. The median age of the 490 participating HIV-positive women was 38 (IQR, 32-43) and 61%, 52%, 47% and 74% were born outside of Canada, living in Toronto, of African ethnicity and currently on antiretroviral therapy, respectively. Of total respondents, 69% (95% CI, 64%-73%) desired to give birth and 57% (95% CI, 53%-62%) intended to give birth in the future. In the multivariable model, the significant predictors of fertility intentions were: younger age (age<40) (p<0.0001), African ethnicity (p<0.0001), living in Toronto (p = 0.002), and a lower number of lifetime births (p = 0.02). CONCLUSIONS/SIGNIFICANCE The proportions of HIV-positive women of reproductive age living in Ontario desiring and intending pregnancy were higher than reported in earlier North American studies. Proportions were more similar to those reported from African populations. Healthcare providers and policy makers need to consider increasing services and support for pregnancy planning for HIV-positive women. This may be particularly significant in jurisdictions with high levels of African immigration.
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Affiliation(s)
- Mona R Loutfy
- Women's College Research Institute, Women's College Hospital, Toronto, Ontario, Canada.
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Davidson RJ, Davis I, Willey BM, Rizg K, Bolotin S, Porter V, Polsky J, Daneman N, McGeer A, Yang P, Scolnik D, Rowsell R, Imas O, Silverman MS. Antimalarial therapy selection for quinolone resistance among Escherichia coli in the absence of quinolone exposure, in tropical South America. PLoS One 2008; 3:e2727. [PMID: 18648533 PMCID: PMC2481278 DOI: 10.1371/journal.pone.0002727] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [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: 03/10/2008] [Accepted: 06/16/2008] [Indexed: 11/18/2022] Open
Abstract
Background Bacterial resistance to antibiotics is thought to develop only in the presence of antibiotic pressure. Here we show evidence to suggest that fluoroquinolone resistance in Escherichia coli has developed in the absence of fluoroquinolone use. Methods Over 4 years, outreach clinic attendees in one moderately remote and five very remote villages in rural Guyana were surveyed for the presence of rectal carriage of ciprofloxacin-resistant Gram-negative bacilli (GNB). Drinking water was tested for the presence of resistant GNB by culture, and the presence of antibacterial agents and chloroquine by HPLC. The development of ciprofloxacin resistance in E. coli was examined after serial exposure to chloroquine. Patient and laboratory isolates of E. coli resistant to ciprofloxacin were assessed by PCR-sequencing for quinolone-resistance-determining-region (QRDR) mutations. Results In the very remote villages, 4.8% of patients carried ciprofloxacin-resistant E. coli with QRDR mutations despite no local availability of quinolones. However, there had been extensive local use of chloroquine, with higher prevalence of resistance seen in the villages shortly after a Plasmodium vivax epidemic (p<0.01). Antibacterial agents were not found in the drinking water, but chloroquine was demonstrated to be present. Chloroquine was found to inhibit the growth of E. coli in vitro. Replica plating demonstrated that 2-step QRDR mutations could be induced in E. coli in response to chloroquine. Conclusions In these remote communities, the heavy use of chloroquine to treat malaria likely selected for ciprofloxacin resistance in E. coli. This may be an important public health problem in malarious areas.
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Affiliation(s)
- Ross J. Davidson
- Queen Elizabeth II Health Sciences Centre, Dalhousie University, Halifax, Canada
- Dalhousie University, Halifax, Canada
| | - Ian Davis
- Lakeridge Health Center, Oshawa, Canada
- University of Toronto, Toronto, Canada
| | - Barbara M. Willey
- Toronto Medical Laboratories/Mount Sinai Hospital Department of Microbiology, Mount Sinai Hospital, Toronto, Canada
| | | | | | - Vanessa Porter
- Toronto Medical Laboratories/Mount Sinai Hospital Department of Microbiology, Mount Sinai Hospital, Toronto, Canada
| | - Jane Polsky
- St. Michael's Hospital Department of Family & Community Medicine, Toronto, Canada
| | | | - Allison McGeer
- University of Toronto, Toronto, Canada
- Toronto Medical Laboratories/Mount Sinai Hospital Department of Microbiology, Mount Sinai Hospital, Toronto, Canada
| | - Paul Yang
- Ontario Ministry of the Environment, Etobicoke, Canada
| | | | | | - Olga Imas
- Toronto Medical Laboratories/Mount Sinai Hospital Department of Microbiology, Mount Sinai Hospital, Toronto, Canada
| | - Michael S. Silverman
- Lakeridge Health Center, Oshawa, Canada
- University of Toronto, Toronto, Canada
- * E-mail:
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Harper KN, Ocampo PS, Steiner BM, George RW, Silverman MS, Bolotin S, Pillay A, Saunders NJ, Armelagos GJ. On the origin of the treponematoses: a phylogenetic approach. PLoS Negl Trop Dis 2008; 2:e148. [PMID: 18235852 PMCID: PMC2217670 DOI: 10.1371/journal.pntd.0000148] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Accepted: 11/15/2007] [Indexed: 11/18/2022] Open
Abstract
Background Since the first recorded epidemic of syphilis in 1495, controversy has surrounded the origins of the bacterium Treponema pallidum subsp. pallidum and its relationship to the pathogens responsible for the other treponemal diseases: yaws, endemic syphilis, and pinta. Some researchers have argued that the syphilis-causing bacterium, or its progenitor, was brought from the New World to Europe by Christopher Columbus and his men, while others maintain that the treponematoses, including syphilis, have a much longer history on the European continent. Methodology/Principal Findings We applied phylogenetics to this problem, using data from 21 genetic regions examined in 26 geographically disparate strains of pathogenic Treponema. Of all the strains examined, the venereal syphilis-causing strains originated most recently and were more closely related to yaws-causing strains from South America than to other non-venereal strains. Old World yaws-causing strains occupied a basal position on the tree, indicating that they arose first in human history, and a simian strain of T. pallidum was found to be indistinguishable from them. Conclusions/Significance Our results lend support to the Columbian theory of syphilis's origin while suggesting that the non-sexually transmitted subspecies arose earlier in the Old World. This study represents the first attempt to address the problem of the origin of syphilis using molecular genetics, as well as the first source of information regarding the genetic make-up of non-venereal strains from the Western hemisphere. For 500 years, controversy has raged around the origin of T. pallidum subsp. pallidum, the bacterium responsible for syphilis. Did Christopher Columbus and his men introduce this pathogen into Renaissance Europe, after contracting it during their voyage to the New World? Or does syphilis have a much older history in the Old World? This paper represents the first attempt to use a phylogenetic approach to solve this question. In addition, it clarifies the evolutionary relationships between the pathogen that causes syphilis and the other T. pallidum subspecies, which cause the neglected tropical diseases yaws and endemic syphilis. Using a collection of pathogenic Treponema strains that is unprecedented in size, we show that yaws appears to be an ancient infection in humans while venereal syphilis arose relatively recently in human history. In addition, the closest relatives of syphilis-causing strains identified in this study were found in South America, providing support for the Columbian theory of syphilis's origin.
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Affiliation(s)
- Kristin N. Harper
- Department of Population Biology, Ecology, and Evolution, Emory University, Atlanta, Georgia, United States of America
- * E-mail:
| | - Paolo S. Ocampo
- School of Medicine, Emory University, Atlanta, Georgia, United States of America
| | - Bret M. Steiner
- Laboratory Reference and Research Branch, Division of Sexually Transmitted Diseases Prevention, NCHHSTP, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Robert W. George
- Laboratory Reference and Research Branch, Division of Sexually Transmitted Diseases Prevention, NCHHSTP, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Michael S. Silverman
- Department of Medicine, Division of Infectious Diseases, University of Toronto, Ontario, Canada
- Lakeridge Health Centre, Ontario, Canada
| | - Shelly Bolotin
- Department of Microbiology, Mount Sinai Hospital, Toronto, Canada
| | - Allan Pillay
- Laboratory Reference and Research Branch, Division of Sexually Transmitted Diseases Prevention, NCHHSTP, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Nigel J. Saunders
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - George J. Armelagos
- Department of Anthropology, Emory University, Atlanta, Georgia, United States of America
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Silverman MS, Reynolds D, Kavsak PA, Garay J, Daly A, Davis I. Use of an interferon-gamma based assay to assess bladder cancer patients treated with intravesical BCG and exposed to tuberculosis. Clin Biochem 2007; 40:913-5. [PMID: 17512514 DOI: 10.1016/j.clinbiochem.2007.04.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2006] [Revised: 04/07/2007] [Accepted: 04/14/2007] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Compare the QuantiFERON-TB Gold In-Tube (QFT) assay and the tuberculin skin test (TST) in bladder cancer patients receiving high dose BCG therapy (BCG patients). DESIGN AND METHODS BCG patients and healthy visitors, both exposed to tuberculosis, were screened with a TST and QFT. RESULTS QFT-TST correlation was excellent in visitors, but poor in BCG patients. BCG therapy predicted a positive TST (p<0.001) but not a positive QFT (p=0.35). DISCUSSION The management of BCG patients was impacted, by measuring the QFT.
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Silverman MS, Aronson L, Eccles M, Eisenstat J, Gottesman M, Rowsell R, Ferron M, Scolnik D. Leptospirosis in febrile men ingesting Agouti paca in South America. Ann Trop Med Parasitol 2005; 98:851-9. [PMID: 15667717 DOI: 10.1179/000349804x3216] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
To explore the relationship between the ingestion of Agouti paca (AP) and human leptospirosis in Guyana, 19 febrile men who said they had hunted and eaten A. paca were screened for malaria, using bloodsmears, and for leptospirosis, using an enzyme immuno-assay that detects Leptospira -specific IgM. Those found positive for anti-Leptospira IgM were then evaluated further, with a microscopical agglutination test based on a limited panel of serovars from three pathogenic species of Leptospira. Although six of the 18 patients who provided suitable samples for the serology were found seropositive for acute leptospirosis, only three of the 19 patients were found smear-positive for malaria. A clinical-decision model, based on medical histories, the results of physical examinations, and the use of routine urine dipsticks, and enabling prediction of the serological results, was developed. This model, which had 83% sensitivity and 100% specificity for leptospirosis, indicated that, in the absence of serology, most febrile patients reporting AP ingestion could be correctly treated if each was checked for malaria using traditional bloodsmears. The smear-positives should be treated with antimalarial drugs whereas the smear-negatives should be treated for leptospirosis if they had any of the following: a skin rash; lymphadenopathy; abnormal urine sediment (proteinuria or haematuria); and/or no previous history of malaria. In the present study, the relative risk of leptospirosis among the patients who were smear-negative for malaria and fulfilled at least one of these four criteria was 13 (P = 0.0007). In Guyana at least, leptospirosis appears to be common among men who hunt, prepare and ingest AP. Vaccines may be the best, practical form of protection among such men.
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López A, Lorente JA, Steingrub J, Bakker J, McLuckie A, Willatts S, Brockway M, Anzueto A, Holzapfel L, Breen D, Silverman MS, Takala J, Donaldson J, Arneson C, Grove G, Grossman S, Grover R. Multiple-center, randomized, placebo-controlled, double-blind study of the nitric oxide synthase inhibitor 546C88: effect on survival in patients with septic shock. Crit Care Med 2004; 32:21-30. [PMID: 14707556 DOI: 10.1097/01.ccm.0000105581.01815.c6] [Citation(s) in RCA: 581] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE To assess the safety and efficacy of the nitric oxide synthase inhibitor 546C88 in patients with septic shock. The predefined primary efficacy objective was survival at day 28. DESIGN Multiple-center, randomized, two-stage, double-blind, placebo-controlled, safety and efficacy study. SETTING A total of 124 intensive care units in Europe, North America, South America, South Africa, and Australasia. PATIENTS A total of 797 patients with septic shock diagnosed for <24 hrs. INTERVENTIONS Patients with septic shock were allocated to receive 546C88 or placebo (5% dextrose) for up to 7 days (stage 1) or 14 days (stage 2) in addition to conventional therapy. Study drug was initiated at 0.05 mL.kg(-1).hr(-1) (2.5 mg.kg(-1).hr(-1) 546C88) and titrated up to a maximum rate of 0.4 mL.kg(-1).hr(-1) to maintain mean arterial pressure between 70 and 90 mm Hg while attempting to withdraw concurrent vasopressors. MEASUREMENTS AND MAIN RESULTS Hemodynamic variables, organ function data, microbiological data, concomitant therapy, and adverse event data were recorded at baseline, throughout treatment, and at follow-up. The primary end point was day-28 survival. The trial was stopped early after review by the independent data safety monitoring board. Day-28 mortality was 59% (259/439) in the 546C88 group and 49% (174/358) in the placebo group (p <.001). The overall incidence of adverse events was similar in both groups, although a higher proportion of the events was considered possibly attributable to study drug in the 546C88 group. Most of the events accounting for the disparity between the groups were associated with the cardiovascular system (e.g., decreased cardiac output, pulmonary hypertension, systemic arterial hypertension, heart failure). The causes of death in the study were consistent with those expected in patients with septic shock, although there was a higher proportion of cardiovascular deaths and a lower incidence of deaths caused by multiple organ failure in the 546C88 group. CONCLUSIONS In this study, the nonselective nitric oxide synthase inhibitor 546C88 increased mortality in patients with septic shock.
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Galloucis M, Silverman MS, Francek HM. The impact of trauma exposure on the cognitive schemas of a sample of paramedics. Int J Emerg Ment Health 2001; 2:5-18. [PMID: 11232104] [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: 02/19/2023]
Abstract
This study examines disruptions in cognitive schemas (i.e., core beliefs about self, others, and the world) among a sample of paramedics. Two hundred fifty-three paramedics working in non-urban and urban settings completed measures of non-work and work-related negative life event and trauma exposure, perceived social support, and cognitive schemas. Forty percent of the respondents experienced at least one disrupted schema and 18 percent had disrupted beliefs about the meaningfulness of the world. Urban paramedics experienced greater disruption in cognitive schemas, particularly with Other-Safety beliefs. The degree of disruption in schemas was independently associated with the extent of non-work and work-related negative life event and trauma exposure, as well as perceived social support. These findings suggest the importance of investigating disruptions of schemas as a posttraumatic sequela among emergency medical personnel.
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Affiliation(s)
- M Galloucis
- Illinois Department of Corrections-Juvenile Division, USA.
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30
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Eng KT, Liu ES, Silverman MS, Berger AR. Lipemia retinalis in acquired immunodeficiency syndrome treated with protease inhibitors. Arch Ophthalmol 2000; 118:425-6. [PMID: 10721972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- K T Eng
- Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
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Mohand-Said S, Hicks D, Simonutti M, Tran-Minh D, Deudon-Combe A, Dreyfus H, Silverman MS, Ogilvie JM, Tenkova T, Sahel J. Photoreceptor transplants increase host cone survival in the retinal degeneration (rd) mouse. Ophthalmic Res 1997; 29:290-7. [PMID: 9323720 DOI: 10.1159/000268027] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.7] [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: 02/05/2023]
Abstract
Retinal transplants offer a potentially interesting approach to treating human retinal degenerations, but so far little quantitative data are available on possible beneficial effects. We isolated photoreceptor layers from normal-sighted mice and grafted them into the subretinal space of retinal degeneration (rd) mice lacking rod photoreceptors. At 2 weeks after surgery, the numbers of residual host cone photoreceptors outside the graft zone were quantified following specific labelling. Examination of operated retinas revealed highly significantly greater numbers of surviving cones (mean of 38% more at 2 weeks) within the central field compared to sham-operated paired control retinas (p < 0.01). These are the first quantified data indicating a trophic effect of transplanted photoreceptors upon host cone cells. As cone cells are responsible for high acuity and colour vision, such data could have important implications not only for eventual therapeutic approaches to human retinal degenerations but also to understanding underlying interactions between retinal photoreceptors.
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Affiliation(s)
- S Mohand-Said
- Laboratoire de Physiopathologie Rétinienne INSERM CJF 92/02-ULP, Centre Hospitalier et Universitaire, Strasbourg, France
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Abstract
PURPOSE Retinal dystrophic (rd) mice lose most of their rod photoreceptors within the first three weeks after birth. We determined the age-related distribution of peanut agglutinin lectin (PNA)-labeled cones during the first 12 months of age. We also investigated whether the density of ON-bipolar cells expressing L7 protein was affected by their loss of photoreceptor inputs. METHODS rd mice were selected from a transgenic strain which expresses an L7-beta-galactosidase fusion gene localized to ON-bipolar cells. Cones were stained with PNA and ON-bipolar cells with bluo-gal (halogenated indolyl-beta-D-galactoside). Retinas were flat-mounted and observed at 1, 2, 3, 6 and 12 months of age. RESULTS PNA-labeled cones are distributed unevenly across the retina at 1 month postnatal. Their concentration decreases first in the central and far peripheral retina, leaving a ring of labeled cells in the midperipheral region. At 3 months, a larger patch of cones remains in the supero-temporal midperipheral region and a smaller patch in the infero-nasal retina. By 6 months, few cones remain in the infero-nasal retina; by 1 year approximately 100 cones remain in the entire retina, localized to the superior midperipheral region. ON-bipolar cells appear evenly distributed at 1 month. By 2-3 months, relatively more bluo-gal staining is seen in the midperipheral regions underlying dense cone populations. At 6-12 months, bluo-gal label is distributed in a spotty pattern with little or no staining seen in areas of apparent neovascularization. CONCLUSIONS (1) PNA-labeling of cones in the rd retina deteriorates in a distinct spatial pattern with the longest cone survival in the midperipheral superior retina. (2) ON-bipolar cells are more densely labeled in regions of high cone density during the early months of cone degeneration and, in later stages, show relative decreases in regions of apparent neovascularization.
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Affiliation(s)
- J M Ogilvie
- Central Institute for the Deaf, St. Louis, MO 63110, USA
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Valentino TL, Kaplan HJ, Del Priore LV, Fang SR, Berger A, Silverman MS. Retinal pigment epithelial repopulation in monkeys after submacular surgery. Arch Ophthalmol 1995; 113:932-8. [PMID: 7605287 DOI: 10.1001/archopht.1995.01100070106033] [Citation(s) in RCA: 48] [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] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
BACKGROUND Transplantation of retinal pigment epithelium may be a treatment for retinal diseases, such as age-related macular degeneration and hereditary macular degeneration. Before transplantation studies are undertaken, questions concerning repopulation of retinal pigment epithelial cells in situ and photoreceptor repair after submacular surgery need to be addressed. METHODS We removed the retinal pigment epithelium from Bruch's membrane in the macaque monkey in the macula and outside the vascular arcades. This model allowed the study of in situ retinal pigment epithelium regrowth and photoreceptor repair for 9 months following débridement. RESULTS Fluorescein angiography revealed a window defect in the area of denuded retinal pigment epithelium. Histologic studies revealed repopulated nonpigmented retinal pigment epithelial cells in the denuded areas in both the early and late periods. At 9 months, the repopulated retinal pigment epithelium was associated with repaired, normal-appearing photoreceptor outer segments. Retinal pigment epithelium regrowth was observed only if Bruch's membrane was intact. CONCLUSIONS Repopulation of retinal pigment epithelium in the adult primate can occur rapidly and can support the repair of damaged photoreceptors following submacular surgery.
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Affiliation(s)
- T L Valentino
- Department of Biology, St Louis (Mo) University, USA
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Abstract
A number of autosomal recessive syndromes feature both sensorineural hearing loss and retinal degeneration. The mouse mutant tubby also combines hearing loss with progressive retinal degeneration, and thus may constitute a useful model of one form of human sensorineural deafness/retinal dystrophic syndrome. It has not been directly demonstrated that the hearing loss in this mouse involves the cochlea, however. We have examined the cochleas of adult tubby mice using light microscopy. The tubby cochlea shows pronounced degeneration of the organ of Corti and loss of afferent neurons in the base, with relative sparing of the apex. Our findings support the tubby mouse as a model of human sensorineural deafness/retinal dystrophic syndrome. Possible human counterparts include Usher's, Alstrom's, and Bardet-Biedl syndromes.
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Affiliation(s)
- K K Ohlemiller
- Research Department, Central Institute for the Deaf, St. Louis, MO 63110, USA
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Silverman MS. A physician who came home. CMAJ 1994; 150:323-4. [PMID: 8293364 PMCID: PMC1486184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Silverman MS, Gartner JG, Halliday WC, Kohl S, Embree J, Kohn S. Persistent cerebrospinal fluid neutrophilia in delayed-onset neonatal encephalitis caused by herpes simplex virus type 2. J Pediatr 1992; 120:567-9. [PMID: 1313097 DOI: 10.1016/s0022-3476(05)82485-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We describe an infant with three unusual features of perinatally acquired herpes simplex virus type 2 encephalitis: onset of illness at 34 days of age, absolute cerebrospinal fluid neutrophilia, and systemic viral dissemination after central nervous system disease. To provide early, effective antiviral therapy, clinicians should be aware of atypical presentations of serious herpes simplex virus infections.
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Affiliation(s)
- M S Silverman
- Department of Pediatrics, University of Manitoba, Winnipeg, Canada
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Silverman MS, Maclean I, Zong GM, Nath A. An improved enzyme-linked immunoadsorbent assay for the detection of antibodies to galactocerebroside. Biotechniques 1992; 12:232, 234. [PMID: 1616716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- M S Silverman
- Dept. of Medical Microbiology, University of Manitoba, Winnipeg, Canada
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Abstract
Adult New Zealand Red (NZR) rabbits were used to determine if the techniques developed in the rat to transplant sheets of photoreceptors could be adapted to larger eyes of the rabbit. Adult donor NZR rabbit retina was cut into small strips, oriented, and drawn up in a small and flat polyethylene tube. By transscleral approach, donor retina was correctly oriented and gently placed into the subretinal space of host retinas that were previously ablated of photoreceptors by intravitreal injection of hemoglobin. Two weeks after surgery, rabbits were terminated and eyes processed for histology. Morphologic evaluation indicated that photoreceptors were transplantable between adult rabbits by adaptation of previously developed methods and that they were well maintained for 2 weeks. Transplanted photoreceptors also appeared to retain nearly normal inner and outer segment (I & OS) morphology and anti-opsin reactivity. Finally, inclusion of the inner retina also appeared to help maintain the correct I & OS apposition to the host retinal pigmented epithelium.
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Affiliation(s)
- S T Schuschereba
- Letterman Army Institute of Research, Presidio of San Francisco, California 94129
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Silverman MS, Hughes SE, Valentino TL, Liu Y. Photoreceptor transplantation: anatomic, electrophysiologic, and behavioral evidence for the functional reconstruction of retinas lacking photoreceptors. Exp Neurol 1992; 115:87-94. [PMID: 1728579 DOI: 10.1016/0014-4886(92)90227-h] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.7] [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: 12/28/2022]
Abstract
We have investigated the possibility of using transplantation of immature or mature rodent photoreceptors as well as mature human photoreceptors to reconstruct retinas in which photoreceptor degeneration is either inherited or environmentally induced. To this end, we have devised methods for isolating and transplanting the outer nuclear layer (ONL) (e.g., the photoreceptor layer) to the subretinal space of mature rodents. In addition we found that if portions of the inner retina are transplanted along with the intact photoreceptor sheet, photoreceptor organization is better maintained. In ultrastructural studies of the reconstructed retina an outer plexiform-like layer (OPL) is visible at the interface of the transplanted ONL and the host inner nuclear layer, with invaginating ribbon synapses characteristic of those formed by rod photoreceptors evident within this OPL. Ribbon synapses are found only rarely in unreconstructed retina. These results suggest that synaptic connections between transplanted photoreceptors and host cells may be made. Evidence for the potential recovery of function following photoreceptor transplantation is found in visually evoked cortical responses and behavioral responses (pupillary reflex) to light stimulation of the reconstructed eye. These findings suggest the possibility that neural transplantation can reconstruct a sensory end organ--in this case the retina--to restore evoked activity and an appropriate behavioral response to sensory stimulation.
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Affiliation(s)
- M S Silverman
- Central Institute for the Deaf, St. Louis, Missouri 63110
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40
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Abstract
Embryonic rat inner ears were transplanted to the anterior chamber of the eyes of adult rats. While considerable development was evident, the structures present were limited to the vestibular division. We hypothesized that this selective survival could be due to the rate of vascularization. To test the effects of graft vascularization we made transplants in which the internal structures were exposed by removing the apex and base of the developing cochlea. The transplants were rapidly vascularized by the iris. Many of the soft labyrinthine structures of the cochlea from 1-day-old donors showed considerable development, including the spiral limbus, basilar membrane, and organ of Corti. To test the possibility that the cochlea requires inductive or trophic support beyond Embryonic Day 15 (E15), we cotransplanted the embryonic inner ear with developing brain stem. In these transplants, we observed improved development of the cochlea, with spiral ganglion cells and an organ of Corti possessing hair cells, Deiter's cells, and pillar cells. To further address the effect of developing CNS tissue on the development of grafted inner ear, we transplanted E15 inner ears to either the cortex or the brain stem of neonatal rats. In these experiments we have seen evidence of both vestibular and cochlear sensory surfaces. In the cochlea, an organ of Corti-like structure can be seen. The possibility of neural connections with the host brain has yet to be investigated.
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Affiliation(s)
- S E Hughes
- Sensory Neuroscience Laboratory, Central Institute for the Deaf, St. Louis, Missouri 63110
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Silverman MS, MacLeod JP. Pancoast's syndrome due to staphylococcal pneumonia. CMAJ 1990; 142:343-5. [PMID: 2302632 PMCID: PMC1451815] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Abstract
Transplantation of normal retinal pigment epithelium (RPE) to the subretinal space has been reported to rescue photoreceptors in the RCS rat. Moreover, the rescue effect was surprisingly large considering the relatively small number of RPE cells transplanted. The reason for this widespread rescue of photoreceptors is not known, nor is the mechanism for outer segment phagocytosis in photoreceptors not apposed to the transplanted RPE cells. This suggests that the rescue effect may not be solely mediated by the transplanted cells. We therefore wished to test whether the transplantation surgery itself might contribute to the rescue of RCS photoreceptors. For these control experiments, we performed the surgery on juvenile RCS rats as described by others for the transplantation of RPE but instead of injecting RPE, we injected saline. We sacrificed the RCS control operates two months following surgery. In the area of the surgery (superior retinal quadrant) the outer nuclear layer (ONL) was up to 8-10 photoreceptor cells thick, while at the extreme inferior margin of the retina the ONL was almost eliminated. To investigate the role of temporary retinal detachment in photoreceptor rescue we repeated the above experiment using our trans-corneal approach to the subretinal space. This procedure results in a large temporary retinal detachment and little or no damage to the choroid and sclera.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M S Silverman
- Sensory Neuroscience Laboratory, Central Institute for the Deaf, St. Louis, MO 63110
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Abstract
We have studied the effects of GH on basal and insulin-stimulated hexose transport by 3T3-F442A adipocytes in a hormonally defined serum-free medium. Adipocytes preincubated in defined medium exhibit a low level of hexose transport which is acutely (15 min) stimulated (greater than 5-fold) by insulin (EC50, 0.1-0.2 nM). GH has acute (15-45 min) insulin-mimetic (greater than 2-fold) and chronic (4-48 h) diabetogenic (50-80%) effects on basal and insulin-stimulated hexose transport. The insulin-mimetic effect of GH has a higher EC50 (2 nM) than its diabetogenic effect (EC50, 0.2 nM). Chronic GH exposure decreases the maximal responsiveness (50-80%) and the acute sensitivity (approximately 2-fold) of hexose transport to insulin. Insulin-stimulated transport is more (approximately 5-fold) sensitive to the diabetogenic effect of GH than is basal transport. Insulin binding and degradation were not altered by chronic exposure to GH. The diabetogenic effect of GH may occur at a postinsulin binding level.
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Affiliation(s)
- M S Silverman
- Memorial Sloan-Kettering Cancer Center, Cornell University Medical College, New York, New York 10021
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44
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Silverman MS, Hughes SE. Transplantation of photoreceptors to light-damaged retina. Invest Ophthalmol Vis Sci 1989; 30:1684-90. [PMID: 2527211] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We investigated the possibility of reconstructing light-damaged retinas by photoreceptor transplantation. The outer nuclear layer containing the photoreceptor cells was eliminated in adult albino rat retinas by exposure to constant high-level illumination. Photoreceptors for transplantation were harvested from neonatal rats using a novel isolation technique that maintained the cellular organization of the outer nuclear layer. Transplantation was accomplished using a transcorneal approach to the subretinal space, which minimized trauma to the eye. The retina reattached to the back of the eye with transplanted photoreceptors interposed between the retina and the overlying tissues. Prelabelling with fluorescent dye enabled positive identification of the transplanted cells. The transplanted photoreceptors appeared to survive transplantation for at least 6 weeks and were immunohistochemically reactive for opsin. The antibody staining for opsin identifies the transplanted cells as photoreceptors and indicates that they are still capable of producing visual pigment and therefore may have the capacity to transduce light. These findings indicate that photoreceptors can be transplanted to form a new outer nuclear layer in a damaged mature retina.
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Affiliation(s)
- M S Silverman
- Central Institute for the Deaf, Washington University, St. Louis, Missouri
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45
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Abstract
We measured the spatial-frequency tuning of cells at regular intervals along tangential probes through the monkey striate cortex and correlated the recording sites with the cortical cytochrome oxidase (CytOx) patterns to address three questions with regard to the cortical spatial-frequency organization. (i) Is there a periodic anatomical arrangement of cells tuned to different spatial-frequency ranges? We found there is, because the spatial-frequency tuning of cells along tangential probes changed systematically, varying from a low frequency to a middle range to high frequencies and back again repeatedly over distances of about 0.6-0.7 mm. (ii) Are there just two populations of cells, low-frequency and high-frequency units, at a given eccentricity (perhaps corresponding to the magno- and parvocellular geniculate pathways) or is there a continuum of spatial-frequency peaks? We found a continuum of peak tuning. Most cells are tuned to intermediate spatial frequencies and form a unimodal rather than a bimodal distribution of cell peaks. Furthermore, the cells with different peak frequencies were found to be continuously and smoothly distributed across a module. (iii) What is the relation between the physiological spatial-frequency organization and the regions of high CytOx concentration ("blobs")? We found a systematic correlation between the topographical variation in spatial-frequency tuning and the modular CytOx pattern, which also varied continuously in density. Low-frequency cells are at the center of the blobs, and cells tuned to increasingly higher spatial frequencies are at increasing radial distances.
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Affiliation(s)
- M S Silverman
- Department of Psychology and Neurobiology Group, University of California, Berkeley 94720
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46
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Tootell RB, Switkes E, Silverman MS, Hamilton SL. Functional anatomy of macaque striate cortex. II. Retinotopic organization. J Neurosci 1988; 8:1531-68. [PMID: 3367210 PMCID: PMC6569212] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Macaque monkeys were shown retinotopically-specific visual stimuli during 14C-2-deoxy-d-glucose (DG) infusion in a study of the retinotopic organization of primary visual cortex (V1). In the central half of V1, the cortical magnification was found to be greater along the vertical than along the horizontal meridian, and overall magnification factors appeared to be scaled proportionate to brain size across different species. The cortical magnification factor (CMF) was found to reach a maximum of about 15 mm/deg at the representation of the fovea, at a point of acute curvature in the V1-V2 border. We find neither a duplication nor an overrepresentation of the vertical meridian. The magnification factor did not appear to be doubled in a direction perpendicular to the ocular dominance strips; it may not be increased at all. The DG borders in parvorecipient layer 4Cb were found to be as sharp as 140 micron (half-amplitude, half width), corresponding to a visual angle of less than 2' of arc at the eccentricity measured. In other layers (including magnorecipient layer 4Ca), the retinotopic borders are broader. The retinotopic spread of activity is greater when produced by a low-spatial-frequency grating than when produced by a high-spatial-frequency grating. Orientation-specific stimuli produced a pattern of activation that spread further than 1 mm across cortex in some layers. Some DG evidence suggests that the spread of functional activity is greater near the foveal representation than near 5 degrees eccentricity.
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Affiliation(s)
- R B Tootell
- Department of Psychology, University of California, Berkeley 94720
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47
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Tootell RB, Hamilton SL, Silverman MS, Switkes E. Functional anatomy of macaque striate cortex. I. Ocular dominance, binocular interactions, and baseline conditions. J Neurosci 1988; 8:1500-30. [PMID: 3367209 PMCID: PMC6569205] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
A series of experiments was carried out using 14C-2-deoxy-d-glucose (DG) in order to examine the functional architecture of macaque striate (primary visual) cortex. This paper describes the results of experiments on uptake during various baseline (or reference) conditions of visual stimulation (described below), and on differences in the functional architecture following monocular versus binocular viewing conditions. In binocular "baseline" experiments, monkeys were stimulated either (1) in the dark, (2) with a diffuse gray screen, or (3) with a very general visual stimulus composed of gratings of varied orientation and spatial frequency. In all of these conditions, DG uptake was found to be topographically uniform within all layers of parafoveal striate cortex. In monocular experiments that were otherwise similar, uptake was topographically uniform within the full extent of the eye dominance strip, in all layers. Certain other visual stimuli produce high uptake in the blobs, and still another set of visual stimuli (including high-spatial-frequency gratings) produce highest uptake between the blobs at parafoveal eccentricities, even in an unanesthetized, unparalyzed monkey. Eye movements per se had no obvious effect on striate DG uptake. Endogenous uptake in the blobs (relative to that in the interblobs) appears higher in the squirrel monkey than in the macaque. The pattern of DG uptake produced by binocular viewing was found to deviate in a number of ways from that expected by linearly summing the component monocular DG patterns. One of the most interesting deviations was an enhancement of the representation of visual field borders between stimuli differing from each other in texture, orientation, direction, etc. This "border enhancement" was confined to striate layers 1-3 (not appearing in any of the striate input layers), and it only appeared following binocular, but not monocular, viewing conditions. The border enhancement may be related to a suppression of DG uptake that occurs during binocular viewing conditions in layers 2 + 3 (and perhaps layers 1 and 4B), but not in layers 4Ca, 4Cb, 5 or 6. Another major class of binocular interaction was a spread of neural activity into the "unstimulated" ocular dominance strips following monocular stimulation. Such an effect was prominent in striate layer 4Ca, but it did not occur in layer 4Cb. This "binocular" spread of DG uptake into the inappropriate eye dominance strip in 4Ca may be related to the appearance of orientation tuning and orientation columns in that layer. No DG effects were seen that depended on the absolute disparity of visual stimuli in macaque striate cortex.
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Affiliation(s)
- R B Tootell
- Department of Psychology, University of California, Berkeley 94720
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48
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Tootell RB, Silverman MS, Hamilton SL, De Valois RL, Switkes E. Functional anatomy of macaque striate cortex. III. Color. J Neurosci 1988; 8:1569-93. [PMID: 3367211 PMCID: PMC6569202] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Using spatially diffuse stimuli (or sinusoidal gratings of very low spatial frequency), levels of 14C-2-deoxy-d-glucose (DG) uptake produced by color-varying stimuli are much greater than those produced by luminance-varying stimuli in macaque striate cortex. Such a difference in DG results is consistent with previous psychophysical and electrophysiological results from man and monkey. In DG experiments with color-varying gratings of low and middle spatial frequencies, or with spatially diffuse color variations, DG uptake was highest in the cytochrome oxidase blobs, as was also seen with low-spatial-frequency luminance gratings. High-spatial-frequency, color-varying uptake patterns were shifted to cover both blob and interblob regions in a manner similar to that of the patterns obtained with middle-spatial-frequency luminance stimuli. However, in no instance did chromatic gratings produce uptake restricted to the interblob regions, as with the pattern seen with the highest-spatial-frequency luminance gratings. Thus, DG uptake is relatively higher in the interblob regions when comparing luminance with color-varying gratings that are otherwise similar. It was also possible to show DG evidence for receptive-field double-opponency in the upper-layer blobs, but color sensitivity in layer 4Cb appears single-opponent. The DG results suggest that color sensitivity is also high in the lower-layer (layers 5 + 6) blobs, and that many layer 5 receptive fields are double-opponent. Striate layers 4Ca and 4B-appeared color-insensitive in a wide variety of DG tests; this supports the idea of a color-insensitive stream running from the magnocellular LGN layers through striate layers 4Ca and 4B to extrastriate areas MT and V3. There was also a major effect due to wavelength: long and short wavelengths produced much more uptake than did middle wavelengths, even when all colors were equated for luminance and saturation. No variation with eccentricity was seen in cortical color sensitivity, at least between 0 degrees and 10 degrees.
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Affiliation(s)
- R B Tootell
- Department of Psychology, University of California, Berkeley 94720
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49
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Tootell RB, Silverman MS, Hamilton SL, Switkes E, De Valois RL. Functional anatomy of macaque striate cortex. V. Spatial frequency. J Neurosci 1988; 8:1610-24. [PMID: 3367213 PMCID: PMC6569194] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
When macaque monkeys view achromatic, sinusoidal gratings of a single spatial frequency, the pattern of 14C-2-deoxy-d-glucose (DG) uptake produced by the gratings is shown to depend on the spatial frequency chosen. When a relatively high (5-7 cycles/deg) spatial frequency is shown binocularly at systematically varied orientations, uptake in parafoveal striate cortex is highest between the cytochrome oxidase blobs (that is, in the interblobs) in layers 1, 2, and 3. In layers 4B, 5, and 6, where the cytochrome oxidase blobs are faint or absent, DG uptake is highest in a periodic pattern that lies in register with the interblobs of layers 2 + 3. When the grating is, instead, of relatively low (1-1.5 cycles/deg) spatial frequency, DG uptake is highest in the blobs, in the blob-aligned portions of layers 1-4B, and in the lower-layer blobs as well. These variations in DG topography are confirmed in stimulus comparisons within a single hemisphere. Presumably, this shift in functional topography within the extra-granular layer is the primate homolog of "spatial frequency columns" shown earlier in the cat (Tootell et al., 1981; Silverman, 1984). In the well-differentiated architecture of primate striate cortex, laminar differences produced by high- versus low-spatial-frequency gratings are visible as well. Gratings of very high spatial frequency produce much higher uptake in 4Cb (which receives input from the parvocellular LGN layers) than in 4Ca (which gets its input from the magnocellular LGN layers). Gratings of low spatial frequency produce the converse result. Presumably, cells in the magnocellular LGN layers and/or in the magnocellular-dominated layer 4Ca have lower average spatial frequency tuning (larger receptive fields) than their counterparts in the parvocellular LGN and/or in striate layer 4Cb. The DG patterns produced by various spatial frequencies also vary with eccentricity, in a manner consistent with known, eccentricity-dependent variations of receptive-field size and spatial frequency tuning. Thus, gratings of a "middle"-spatial-frequency range (4-5 cycles/deg) produce high uptake in the blobs near the foveal representation and high uptake in the interblobs at more peripheral eccentricities, including 5 degrees. This shift in DG topography also includes the transition zone near 3 degrees, where the level of stimulus-driven uptake is as high in the blob regions as it is in interblob regions. Variations in uptake between layers 4Ca and 4Cb, as a function of eccentricity, shift in parallel with the changes in the upper-layer topography.
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Affiliation(s)
- R B Tootell
- Department of Psychology, University of California, Berkeley 94720
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50
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Silverman MS, Tootell RB. Modified technique for cytochrome oxidase histochemistry: increased staining intensity and compatibility with 2-deoxyglucose autoradiography. J Neurosci Methods 1987; 19:1-10. [PMID: 2434810 DOI: 10.1016/0165-0270(87)90016-1] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Staining the brain for cytochrome oxidase (CO) produces patterns which can resemble the patterns produced by 2-deoxyglucose (2-DG) autoradiography. In order to assess the differences between CO patterns of long-term metabolic activity and 2-DG patterns of short-term activity, comparisons should, ideally, be made on the same section. Consequently, we have made certain modifications in the standard CO histologic procedure which improve the stain and allow both 2-DG autoradiography and CO staining on the same section.
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