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Jafarzadeh A, Motaghi M, Patra SK, Jafarzadeh Z, Nemati M, Saha B. Neutrophil generation from hematopoietic progenitor cells and induced pluripotent stem cells (iPSCs): potential applications. Cytotherapy 2024; 26:797-805. [PMID: 38625068 DOI: 10.1016/j.jcyt.2024.03.483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 03/22/2024] [Accepted: 03/24/2024] [Indexed: 04/17/2024]
Abstract
Neutrophils are the most frequent immune cell type in peripheral blood, performing an essential role against pathogens. People with neutrophil deficiencies are susceptible to deadly infections, highlighting the importance of generating these cells in host immunity. Neutrophils can be generated from hematopoietic progenitor cells (HPCs) and embryonic stem cells (ESCs) using a cocktail of cytokines. In addition, induced pluripotent stem cells (iPSCs) can be differentiated into various functional cell types, including neutrophils. iPSCs can be derived from differentiated cells, such as skin and blood cells, by reprogramming them to a pluripotent state. Neutrophil generation from iPSCs involves a multistep process that can be performed through feeder cell-dependent and feeder cell-independent manners. Various cytokines and growth factors, in particular, stem cell facto, IL-3, thrombopoietin and granulocyte colony-stimulating factor (G-CSF), are used in both methods, especially, G-CSF which induces the final differentiation of neutrophils in the granulocyte lineage. iPSC-derived neutrophils have been used as a valuable tool for studying rare genetic disorders affecting neutrophils. The iPSC-derived neutrophils can also be used for disease modeling, infection research and drug discovery. However, several challenges must be overcome before iPSC-derived neutrophils can be used therapeutically in transplantation medicine. This review provides an overview of the commonly employed protocols for generating neutrophils from HPCs, ESCs and iPSCs and discusses the potential applications of the generated cells in research and medicine.
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Affiliation(s)
- Abdollah Jafarzadeh
- Applied Cellular and Molecular Research Center, Kerman University of Medical Sciences, Kerman, Iran; Department of Immunology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran; Clinical Immunology Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.
| | - Marzieh Motaghi
- Department of Hematology and Laboratory Sciences, School of Para-Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | | | - Zahra Jafarzadeh
- Student Research Committee, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran
| | - Maryam Nemati
- Department of Hematology and Laboratory Sciences, School of Para-Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Bhaskar Saha
- National Centre for Cell Science, Ganeshkhind, Pune, India
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López-Arredondo A, Cruz-Cardenas JA, Cázares-Preciado JA, Timmins NE, Brunck ME. Neutrophils, an emerging new therapeutic platform. Curr Opin Biotechnol 2024; 87:103106. [PMID: 38490109 DOI: 10.1016/j.copbio.2024.103106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 01/30/2024] [Accepted: 02/19/2024] [Indexed: 03/17/2024]
Abstract
Neutrophils possess unique characteristics that render them indispensable to health, and patients with irregular neutrophil counts or functions suffer from increased morbidity and mortality. As neutrophils are short-lived postmitotic cells, genetic aberrations cannot be corrected directly in neutrophils and must be targeted in their progenitors. Neutrophils are increasingly being contemplated for a range of therapeutic applications, including restoration or modulation of immune function and targeting of solid tumors. This review addresses the state-of-the-art in neutrophil transfusions and their possible applications for infectious disease prevention and treatment. It offers a landscape of the most recent gene therapy approaches to address neutrophil-related genetic diseases. We also discuss how ongoing research could broaden the applicability of neutrophil-based therapies to solid cancer treatments and beyond.
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Affiliation(s)
- Alejandra López-Arredondo
- Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Tecnologico, 64849 Monterrey, Nuevo León, Mexico
| | - José A Cruz-Cardenas
- Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Tecnologico, 64849 Monterrey, Nuevo León, Mexico
| | - Jorge A Cázares-Preciado
- Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Tecnologico, 64849 Monterrey, Nuevo León, Mexico
| | - Nicholas E Timmins
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane QLD 4072, Australia
| | - Marion Eg Brunck
- Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Tecnologico, 64849 Monterrey, Nuevo León, Mexico; The Institute for Obesity Research, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Tecnologico, 64849 Monterrey, Nuevo León, Mexico.
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Stemler J, Mellinghoff SC, Khodamoradi Y, Sprute R, Classen AY, Zapke SE, Hoenigl M, Krause R, Schmidt-Hieber M, Heinz WJ, Klein M, Koehler P, Liss B, Koldehoff M, Buhl C, Penack O, Maschmeyer G, Schalk E, Lass-Flörl C, Karthaus M, Ruhnke M, Cornely OA, Teschner D. Primary prophylaxis of invasive fungal diseases in patients with haematological malignancies: 2022 update of the recommendations of the Infectious Diseases Working Party (AGIHO) of the German Society for Haematology and Medical Oncology (DGHO). J Antimicrob Chemother 2023:dkad143. [PMID: 37311136 PMCID: PMC10393896 DOI: 10.1093/jac/dkad143] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023] Open
Abstract
Patients with haematological malignancies (HM) are at high risk of developing invasive fungal disease (IFD) with high morbidity and attributable mortality. We reviewed data published until September 2021 to update the 2017 antifungal prophylaxis recommendations of the German Society of Haematology and Medical Oncology (DGHO). The strong recommendation to administer antifungal prophylaxis in patients with HM with long-lasting neutropenia, i.e. <500 cells/μL for >7 days remains unchanged. Posaconazole remains the drug of choice for mould-active prophylaxis in these patients. Novel treatment options in HM, such as CAR-T-cell treatment or novel targeted therapies for acute myeloid leukaemia (AML) were considered, however, data are insufficient to give general recommendations for routine antifungal prophylaxis in these patients. Major changes regarding specific recommendations compared to the 2017 edition are the now moderate instead of mild support for the recommendations of isavuconazole and voriconazole. Furthermore, published evidence on micafungin allows recommending it at moderate strength for its use in HM. For the first time we included recommendations for non-pharmaceutical measures regarding IFD, comprising the use of high-efficiency particulate air (HEPA) filters, smoking, measures during construction work and neutropenic diets. We reviewed the impact of antifungal prophylaxis with triazoles on drug-drug interactions with novel targeted therapies that are metabolized via cytochrome p450 where triazoles inhibit CYP3A4/5. The working group recommends reducing the dose of venetoclax when used concomitantly with strong CYP3A4 inhibiting antifungals. Furthermore, we reviewed data on the prophylactic use of novel antifungal agents. Currently there is no evidence to support their use in a prophylactic setting in clinical practice.
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Affiliation(s)
- Jannik Stemler
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany
- German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Sibylle C Mellinghoff
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany
- German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Yascha Khodamoradi
- Department of Internal Medicine, Infectious Diseases, University Hospital Frankfurt, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Rosanne Sprute
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany
- German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Annika Y Classen
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Sonja E Zapke
- Department Hematology, Oncology, Infectious disease and Palliatve Care, Helios University Hospital Wuppertal, Wuppertal, Germany
| | - Martin Hoenigl
- Division of Infectious Diseases, Department of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Medical University of Graz, Graz, Austria and BioTechMed, Graz, Austria
| | - Robert Krause
- Division of Infectious Diseases, Department of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Medical University of Graz, Graz, Austria and BioTechMed, Graz, Austria
| | - Martin Schmidt-Hieber
- 2nd Medical Clinic (Hematology, Oncology, Pneumology, Nephrology), Carl-Thiem Clinic Cottbus, Cottbus, Germany
| | - Werner J Heinz
- Medical Clinic II, Caritas Hospital, Bad Mergentheim, Germany
| | - Michael Klein
- Department of Hematology and Medical Oncology, Klinikum Vest, Knappschaftskrankenhaus, Recklinghausen, Germany
| | - Philipp Koehler
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, Germany
| | - Blasius Liss
- Department Hematology, Oncology, Infectious disease and Palliatve Care, Helios University Hospital Wuppertal, Wuppertal, Germany
- School of Medicine, Faculty of Health, Witten/Herdecke University, Witten, Germany
| | - Michael Koldehoff
- Department of Bone Marrow Transplantation, West German Cancer Center, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
- Department of Hygiene and Environmental Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | | | - Olaf Penack
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Berlin, Germany
- Humboldt-Universität zu Berlin, Department of Hematology, Oncology and Tumorimmunology, Berlin, Germany
| | - Georg Maschmeyer
- Formerly Department of Hematology, Oncology and Palliative Care, Klinikum Ernst von Bergmann, Potsdam, Germany
| | - Enrico Schalk
- Department of Haematology and Oncology, Medical Centre, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Cornelia Lass-Flörl
- Institute of Hygiene and Medical Microbiology, ECMM Excellence Centre, Medical University of Innsbruck, Innsbruck, Austria
| | - Meinolf Karthaus
- Department of Hematology, Oncology and Palliative Care, Klinikum Neuperlach, Munich, Germany
| | - Markus Ruhnke
- Helios Klinikum Aue, Klinik für Hämatologie/Onkologie & Palliativmedizin, Aue, Germany
| | - Oliver A Cornely
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department I of Internal Medicine, Excellence Center for Medical Mycology (ECMM), Cologne, Germany
- German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Chair Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Cologne, NRW, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Clinical Trials Centre Cologne (ZKS Köln), Cologne, Germany
| | - Daniel Teschner
- Department of Hematology, and Medical Oncology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
- Department of Internal Medicine II, University Hospital Würzburg, Würzburg, Germany
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In Vitro Human Haematopoietic Stem Cell Expansion and Differentiation. Cells 2023; 12:cells12060896. [PMID: 36980237 PMCID: PMC10046976 DOI: 10.3390/cells12060896] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 03/08/2023] [Accepted: 03/09/2023] [Indexed: 03/17/2023] Open
Abstract
The haematopoietic system plays an essential role in our health and survival. It is comprised of a range of mature blood and immune cell types, including oxygen-carrying erythrocytes, platelet-producing megakaryocytes and infection-fighting myeloid and lymphoid cells. Self-renewing multipotent haematopoietic stem cells (HSCs) and a range of intermediate haematopoietic progenitor cell types differentiate into these mature cell types to continuously support haematopoietic system homeostasis throughout life. This process of haematopoiesis is tightly regulated in vivo and primarily takes place in the bone marrow. Over the years, a range of in vitro culture systems have been developed, either to expand haematopoietic stem and progenitor cells or to differentiate them into the various haematopoietic lineages, based on the use of recombinant cytokines, co-culture systems and/or small molecules. These approaches provide important tractable models to study human haematopoiesis in vitro. Additionally, haematopoietic cell culture systems are being developed and clinical tested as a source of cell products for transplantation and transfusion medicine. This review discusses the in vitro culture protocols for human HSC expansion and differentiation, and summarises the key factors involved in these biological processes.
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Morton S, Fleming K, Stanworth SJ. How are granulocytes for transfusion best used? The past, the present and the future. Br J Haematol 2023; 200:420-428. [PMID: 36114720 DOI: 10.1111/bjh.18445] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/17/2022] [Accepted: 08/22/2022] [Indexed: 02/04/2023]
Abstract
Granulocyte transfusions continue to be used in clinical practice, predominantly for treatment of refractory infection in the setting of severe neutropenia. There is biological plausibility for effectiveness in these patients with deficiencies of neutrophils, either as a consequence of disease or treatment. However, there is a chequered history of conducting and completing interventional trials to define optimal use, and many uncertainties remain regarding schedule and dose. Practice and clinical studies are severely limited by the short shelf life and viability of current products, which often restricts the timely access to granulocyte transfusions. In the future, methods are needed to optimise donor-derived granulocyte products. Options include use of manufactured neutrophils, expanded and engineered from stem cells. Further possibilities include manipulation of neutrophils to enhance their function and/or longevity. Granulocyte transfusions contain a heterogeneous mix of cells, and there is additional interest in how these transfusions may have immunomodulatory effects, including for potential uses as adjuncts for anti-cancer effects.
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Affiliation(s)
- Suzy Morton
- Transfusion Medicine, NHS Blood and Transplant, Birmingham, UK.,University Hospitals Birmingham, Birmingham, UK
| | - Katy Fleming
- Bristol Haematology and Oncology Centre, Bristol, UK.,School of Cellular and Molecular Medicine, University of Bristol, Bristol, UK
| | - Simon J Stanworth
- Transfusion Medicine, NHS Blood and Transplant, Oxford, UK.,Department of Haematology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK.,Radcliffe Department of Medicine, University of Oxford, and NIHR Oxford Biomedical Research Centre, Oxford, UK
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Assessment of Safety and Immunogenicity of MHC homozygous iPSC-derived CD34+ Hematopoietic Progenitors in a NHP Model. Blood Adv 2022; 6:5267-5278. [PMID: 35404997 PMCID: PMC9631690 DOI: 10.1182/bloodadvances.2022006984] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 03/27/2022] [Indexed: 11/29/2022] Open
Abstract
Infusion of iHPs is safe and well tolerated in NHPs. iHPs are hypoimmunogenic and can be administered with a low risk of alloimmunization.
Administration of ex vivo expanded somatic myeloid progenitors has been explored as a way to facilitate a more rapid myeloid recovery and improve overall survival after myeloablation. Recent advances in induced pluripotent stem cell (iPSC) technologies have created alternative platforms for supplying off-the-shelf immunologically compatible myeloid progenitors, including cellular products derived from major histocompatibility complex (MHC) homozygous superdonors, potentially increasing the availability of MHC-matching cells and maximizing the utility of stem cell banking. However, the teratogenic and tumorigenic potential of iPSC-derived progenitor cells and whether they will induce alloreactive antibodies upon transfer remain unclear. We evaluated the safety and efficacy of using CD34+CD45+ hematopoietic progenitors derived from MHC homozygous iPSCs (iHPs) to treat cytopenia after myeloablative hematopoietic stem cell (HSC) transplantation in a Mauritian cynomolgus macaque (MCM) nonhuman primate (NHP) model. We demonstrated that infusion of iHPs was well tolerated and safe, observing no teratomas or tumors in the MCMs up to 1 year after HSC transplantation and iHP infusion. Importantly, the iHPs also did not induce significant levels of alloantibodies in MHC-matched or -mismatched immunocompetent MCMs, even after increasing MHC expression on iHPs with interferon-γ. These results support the feasibility of iHP use in the setting of myeloablation and suggest that iHP products pose a low risk of inducing alloreactive antibodies.
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Dale DC, Price TH. Neutropenia and infections: Neutrophil replacement through genetic engineering. J Leukoc Biol 2022; 111:1131-1132. [PMID: 35362111 DOI: 10.1002/jlb.1ce0122-031r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- David C Dale
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Thomas H Price
- Department of Medicine, University of Washington, Seattle, Washington, USA
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Sykes DB, Martinelli MM, Negoro P, Xu S, Maxcy K, Timmer K, Viens AL, Alexander NJ, Atallah J, Snarr BD, Baistrocchi SR, Atallah NJ, Hopke A, Scherer A, Rosales I, Irimia D, Sheppard DC, Mansour MK. Transfusable neutrophil progenitors as cellular therapy for the prevention of invasive fungal infections. J Leukoc Biol 2022; 111:1133-1145. [PMID: 35355310 DOI: 10.1002/jlb.4hi1221-722r] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 03/07/2022] [Indexed: 12/19/2022] Open
Abstract
The use of mature neutrophil (granulocyte) transfusions for the treatment of neutropenic patients with invasive fungal infections (IFIs) has been the focus of multiple clinical trials. Despite these efforts, the transfusion of mature neutrophils has resulted in limited clinical benefit, likely owing to problems of insufficient numbers and the very short lifespan of these donor cells. In this report, we employed a system of conditionally immortalized murine neutrophil progenitors that are capable of continuous expansion, allowing for the generation of unlimited numbers of homogenous granulocyte-macrophage progenitors (GMPs). These GMPs were assayed in vivo to demonstrate their effect on survival in 2 models of IFI: candidemia and pulmonary aspergillosis. Mature neutrophils derived from GMPs executed all cardinal functions of neutrophils. Transfused GMPs homed to the bone marrow and spleen, where they completed normal differentiation to mature neutrophils. These neutrophils were capable of homing and extravasation in response to inflammatory stimuli using a sterile peritoneal challenge model. Furthermore, conditionally immortalized GMP transfusions significantly improved survival in models of candidemia and pulmonary aspergillosis. These data confirm the therapeutic benefit of prophylactic GMP transfusions in the setting of neutropenia and encourage development of progenitor cellular therapies for the management of fungal disease in high-risk patients.
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Affiliation(s)
- David B Sykes
- Harvard Medical School, Boston, Massachusetts, USA
- Center for Regenerative Medicine, Boston, Massachusetts, USA
- Harvard Stem Cell Institute, Boston, Massachusetts, USA
| | - Michelle M Martinelli
- Harvard Medical School, Boston, Massachusetts, USA
- Center for Regenerative Medicine, Boston, Massachusetts, USA
- Harvard Stem Cell Institute, Boston, Massachusetts, USA
| | - Paige Negoro
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Shuying Xu
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Katrina Maxcy
- Harvard Medical School, Boston, Massachusetts, USA
- Center for Regenerative Medicine, Boston, Massachusetts, USA
- Harvard Stem Cell Institute, Boston, Massachusetts, USA
| | - Kyle Timmer
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Adam L Viens
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Natalie J Alexander
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Johnny Atallah
- Harvard Medical School, Boston, Massachusetts, USA
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Brendan D Snarr
- Research Institute of the McGill University Health Center, Montreal, Canada
| | | | - Natalie J Atallah
- Harvard Medical School, Boston, Massachusetts, USA
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Alex Hopke
- BioMEMS, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Allison Scherer
- Harvard Medical School, Boston, Massachusetts, USA
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Ivy Rosales
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Daniel Irimia
- BioMEMS, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Donald C Sheppard
- Research Institute of the McGill University Health Center, Montreal, Canada
| | - Michael K Mansour
- Harvard Medical School, Boston, Massachusetts, USA
- Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USA
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