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Seeburruth D, Tong XC, Kirwan C, Ramsden S, Kibria A, Carter J, Huang J, McArthur R, Clayton N, de Wit K. Eligibility for anticoagulation initiation in atrial fibrillation: Agreement between emergency physician and medical record review. Acad Emerg Med 2024. [PMID: 38456355 DOI: 10.1111/acem.14889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 02/04/2024] [Accepted: 02/12/2024] [Indexed: 03/09/2024]
Affiliation(s)
- Darshana Seeburruth
- Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - X Catherine Tong
- Department of Family Medicine, McMaster University, Kitchener-Waterloo, Ontario, Canada
| | - Christopher Kirwan
- Department of Family Medicine, Queen's University, Kingston, Ontario, Canada
| | - Sophie Ramsden
- Division of Emergency Medicine, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Aqsa Kibria
- Royal College of Surgeons in Ireland (RCSI), Bahrain
| | - Jaimie Carter
- Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Johnny Huang
- Department of Family Medicine, McMaster University, Kitchener-Waterloo, Ontario, Canada
| | - Robyn McArthur
- School of Pharmacy, University of Waterloo, Waterloo, Ontario, Canada
| | - Natasha Clayton
- Emergency Department, Hamilton Health Sciences, Hamilton, Ontario, Canada
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada
| | - Kerstin de Wit
- Division of Emergency Medicine, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada
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2
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Elma A, Vanstone M, Allice I, Barber C, Howard M, Mountjoy M, Siu H, Baker A, Guscott J, Tong XC, Farag A, Grierson L. The Certificate of Added Competence credentialling program in family medicine: a descriptive survey of the family physician perspective of enhanced skill practices in Canada. Can Med Educ J 2023; 14:121-144. [PMID: 38045065 PMCID: PMC10690006 DOI: 10.36834/cmej.77114] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Introduction The College of Family Physicians of Canada (CFPC) offers the Certificate of Added Competence (CAC) program to designate a family physician with enhanced skills. In 2015, the College expanded its program to introduce enhanced certification in four new domains: Palliative Care, Care of the Elderly, Sports and Exercise Medicine, and Family Practice Anesthesia. In this study, we elicited perceptions from Canadian family physicians with and without the CAC on practice impacts associated with the program. Methods Active family physicians in Canada with and without CACs were surveyed between November 2019 to January 2020. Descriptive statistics were generated to describe the perceptions of family physicians regarding the CAC program and its impacts on practice. Results Respondents agreed with several benefits of the program including enhancing the capacity to deliver comprehensive care, alleviating the burden of patient travel by increasing the availability of care in rural and remote communities, and providing opportunities to engage in various collaborative care models and new leadership roles. All respondents perceived CAC holders to pursue the certificate to meet both professional interests and community needs. Conclusions There is a need for strong and continued investment in systemic practice improvements that incentivize the delivery of comprehensive family medicine practice.
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Affiliation(s)
- Asiana Elma
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Meredith Vanstone
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Ilana Allice
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Cassandra Barber
- McMaster Education Research, Innovation, and Theory (MERIT), Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Michelle Howard
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Margo Mountjoy
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Henry Siu
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Alison Baker
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Jesse Guscott
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - X Catherine Tong
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Alexandra Farag
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
| | - Lawrence Grierson
- Department of Family Medicine, Faculty of Health Sciences, McMaster University, Ontario, Canada
- McMaster Education Research, Innovation, and Theory (MERIT), Faculty of Health Sciences, McMaster University, Ontario, Canada
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3
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Li SA, Chen R, Tong XC, Wong AK, Chan TM. Learning while leading: a realist evaluation of an academic leadership programme. BMJ Lead 2022; 6:263-270. [PMID: 36794608 DOI: 10.1136/leader-2021-000508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 10/27/2021] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Many academic health centres and universities have implemented leadership development programmes; however, their potential impact in different contexts in healthcare remains unknown. We assessed the impact of an academic leadership development programme on the self-reported leadership activities of faculty leaders in their respective work contexts. METHODS Ten faculty leaders who participated in a 10-month leadership development programme between 2017 and 2020 were interviewed. The realist evaluation approach was used to guide deductive content analysis, allowing concepts related to what works for whom, why and when to emerge from the data. RESULTS Faculty leaders benefited in different ways depending on the organisational context (eg, culture) in which they reside and their individual contexts (eg, personal aspirations as a leader). Faculty leaders who have minimal mentorship in their leadership role gained an increased sense of community and belongingness with peer leaders and received validation in their personal leadership approach from the programme. Faculty leaders with accessible mentors were more likely than their peers to apply the knowledge they learnt to their work settings. Prolonged engagement among faculty leaders in the 10-month programme fostered continuity of learning and peer support that extended beyond programme completion. CONCLUSIONS This academic leadership programme included participation of faculty leaders in different contexts, resulted in varying impacts on participants' learning outcomes, leader self-efficacy and application of acquired knowledge. Faculty administrators should look for programmes with a multitude of learning interfaces to extract knowledge, hone leadership skills and build networks.
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Affiliation(s)
- Shelly-Anne Li
- Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Toronto, Ontario, Canada
| | - Ruth Chen
- School of Nursing, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.,Office of Continuing Professional Development, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada.,Academic Leadership Program, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - X Catherine Tong
- Office of Continuing Professional Development, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada.,Michael G. DeGroote School of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.,Department of Family Medicine, Waterloo Regional Campus, McMaster University, Waterloo, ON, Canada
| | - Anne K Wong
- Academic Leadership Program, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada.,Michael G. DeGroote School of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.,Department of Anesthesia, McMaster University, Hamilton, ON, Canada
| | - Teresa M Chan
- Office of Continuing Professional Development, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada .,Michael G. DeGroote School of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.,Division of Education & Innovation, Division of Emergency Medicine, Department of Medicine, McMaster University, Hamilton, ON, Canada
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4
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Kirwan C, Ramsden S, Carter J, Tong XC, Huang J, Clayton N, McArthur R, Kibria A, de Wit K. Starting anticoagulation for atrial fibrillation in the emergency department safely. Emerg Med J 2022; 39:emermed-2022-212487. [PMID: 36002241 DOI: 10.1136/emermed-2022-212487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/12/2022] [Indexed: 11/03/2022]
Affiliation(s)
- Christopher Kirwan
- Department of Family Medicine, Queen's University Faculty of Health Sciences, Kingston, Ontario, Canada
| | - Sophie Ramsden
- Department of Emergency Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Jaimee Carter
- Department of Emergency Medicine, McMaster University, Hamilton, Ontario, Canada
| | - X Catherine Tong
- Department of Family Medicine, McMaster University, Kitchener, Ontario, Canada
| | - Johnny Huang
- Department of Family Medicine, McMaster University, Cambridge, Ontario, Canada
| | - Natasha Clayton
- Department of Emergency Medicine, Hamilton Health Sciences, Hamilton, Ontario, Canada
| | - Robyn McArthur
- Department of Pharmacy, University of Waterloo, Waterloo, Ontario, Canada
| | - Aqsa Kibria
- Medical School, Royal College of Surgeons in Ireland and Medical University of Bahrain, Busaiteen, Bahrain
| | - Kerstin de Wit
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada
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5
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Grierson L, Allice I, Tong XC, Yu-Hin Siu H, Mountjoy M, Howard M, Guscott J, Farag A, Baker A, Vanstone M. Motivations for Pursuing Enhanced Skill Credentials in Family Medicine: A Study of the Certificates of Added Competence in Canada. Fam Med 2022; 54:431-437. [DOI: 10.22454/fammed.2022.213612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Background and Objectives: The College of Family of Physicians of Canada’s Certificates of Added Competence (CACs) denote enhanced-skill family physicians who function beyond the scope of family practice or in specialized areas fundamental to family medicine practice. The credential provides recognition for skill development in areas of need and is intended to augment comprehensive care; however, there are concerns that it increases focused practice and decreases commitment to generalist care. To inform credentialing policies, we elucidated physician and trainee motivations for pursuing the CAC credential.
Methods: We conducted secondary analyses of interview data collected during a multiple case study of the impacts of the CACs in Canada. We collected data from six cases, sampled to reflect variability in geography, patient population, and practice arrangement. The 48 participants included CAC holders, enhanced-skill family physicians, generalist family physicians, residents, specialists, and administrative staff. We subjected data to qualitative descriptive analysis, beginning with inductive code generation, and concluding in unconstrained deduction.
Results: Family physicians and trainees pursue the credential to meet community health care needs, limit or promote diversity in practice, secure perceived professional benefits, and/or validate their sense of expertise. Notably, family physicians face barriers to engaging in enhanced skill training once their practice is established.
Conclusions: While the CACs can enhance community-adaptive comprehensive care, they can also incentivize migration away from generalist practice. Credentialing policies should support enhanced skill designations that respond directly to pervasive community needs.
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Affiliation(s)
- Lawrence Grierson
- Department of Family Medicine
- and McMaster Education Research, Innovation, and Theory (MERIT)
- McMaster University, Hamilton, Canada
| | - Ilana Allice
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - X. Catherine Tong
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Henry Yu-Hin Siu
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Margo Mountjoy
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Michelle Howard
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Jesse Guscott
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Alexandra Farag
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Alison Baker
- Department of Family Medicine, McMaster University, Hamilton, Canada
| | - Meredith Vanstone
- Department of Family Medicine and McMaster Education Research, Innovation, and Theory (MERIT)
- McMaster University, Hamilton, Canada
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Jayabarathan A, Tong XC, Geekie-Sousa A, Patel T, Kundi A, Beecroft J, Monteiro S, Chan TM, Thompson K, Zdyb T. Big ideas: Top 4 proposals presented at Family Medicine Forum. Can Fam Physician 2022; 68:97-98. [PMID: 35177496 PMCID: PMC9842182 DOI: 10.46747/cfp.680297] [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] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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7
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Jayabarathan A, Tong XC, Geekie-Sousa A, Patel T, Kundi A, Beecroft J, Monteiro S, Chan TM, Thompson K, Zdyb T. Idées audacieuses. Can Fam Physician 2022; 68:e26-e28. [PMID: 35177511 PMCID: PMC9842185 DOI: 10.46747/cfp.6802e26] [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] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Grierson L, Allice I, Baker A, Farag A, Guscott J, Howard M, Mountjoy M, Siu HYH, Tong XC, Vanstone M. Impacts of the Certificates of Added Competence credentialling program: a qualitative case study of enhanced-skill family medicine practice across Canada. CMAJ Open 2021; 9:E966-E972. [PMID: 34753785 PMCID: PMC8580827 DOI: 10.9778/cmajo.20200278] [Citation(s) in RCA: 9] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND In 2015, the College of Family Physicians of Canada (CFPC) expanded its Certificates of Added Competence (CAC) program to include enhanced-skill certification in Care of Elderly, Family Practice Anesthesia, Palliative Care, and Sports and Exercise Medicine. We aimed to describe the impact of these 4 CACs on the provision of comprehensive care in Canada, while also identifying the factors of influence that foster these impacts. METHODS Between September 2018 and June 2019, we conducted qualitative case studies of 6 family medicine practices across Canada, sampled to represent geographic, population and practice arrangement diversity. We developed a framework of relevant factors and their relations to CAC-mediated comprehensive care delivery. We took an exploratory approach to the first 4 case studies, guided by theoretical propositions based on a literature review, and the CFPC's 4 principles of family medicine and goals for practice. The emerging theory was confirmed and adapted through the final 2 explanatory case studies. Data were obtained through semistructured qualitative interviews with enhanced-skill and generalist physicians, specialists, trainees and administrators associated with these cases. We performed a descriptive content analysis, within and across cases. RESULTS Interviews with 48 participants showed considerable variation in the way CACs are operationalized related to the specific domain of care, the community, relationships among practitioners, motivations of the practitioner and needs of the patient population. The presence of CAC holders in communities expands the scope of available services, reduces the need for patients to travel and encourages continuity of care; however, comprehensive care may be negatively affected when CAC holders develop enhanced-skill practices according to clinical interests rather than community needs. Factors associated with collaborative care models, practice requirements, remuneration structure, community culture and individual aspirations interact to reinforce or undermine the effectiveness of enhanced-skill practices. INTERPRETATION Holders of CACs have a positive impact when they work in collaborative models that align with the needs of communities and that support local generalist family physicians. Health care policies should incentivize CAC activities that contribute to planned care delivery at the practice and community levels.
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Affiliation(s)
- Lawrence Grierson
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont.
| | - Ilana Allice
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Alison Baker
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Alexandra Farag
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Jesse Guscott
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Michelle Howard
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Margo Mountjoy
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Henry Y-H Siu
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - X Catherine Tong
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
| | - Meredith Vanstone
- Department of Family Medicine (Grierson, Allice, Baker, Farag, Guscott, Howard, Mountjoy, Siu, Tong, Vanstone) and McMaster Education Research, Innovation and Theory Program (Grierson, Vanstone), Faculty of Health Sciences, McMaster University, Hamilton, Ont
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9
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Tong XC, Hogan A, Searle L, Chan TM. "House calls": An approach to faculty development in distributed medical education. Med Teach 2021; 43:920-921. [PMID: 34061702 DOI: 10.1080/0142159x.2021.1929901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Affiliation(s)
- X C Tong
- Division of Emergency Medicine, Department of Family Medicine, Faculty of Health Sciences, McMaster University, Kitchener, Canada
- Waterloo Regional Campus, Faculty of Health Sciences, McMaster University, Kitchener, Canada
| | - A Hogan
- Faculty Development and Engagement, Dalhousie Medicine New Brunswick, Dalhousie University, Saint John, Canada
| | - L Searle
- Department of Family and Palliative Medicine, Faculty of Medicine, Dalhousie University, Moncton, Canada
- Faculty Development, Dalhousie Medicine New Brunswick, Saint John, Canada
| | - T M Chan
- Division of Emergency Medicine, Department of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, Canada
- Program for Faculty Development, Faculty of Health Sciences, McMaster University, Hamilton, Canada
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10
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Yilmaz Y, Lal S, Tong XC, Howard M, Bal S, Bayer I, Monteiro S, Chan TM. Technology-Enhanced Faculty Development: Future Trends and Possibilities for Health Sciences Education. Med Sci Educ 2020; 30:1787-1796. [PMID: 33078084 PMCID: PMC7556766 DOI: 10.1007/s40670-020-01100-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/01/2020] [Indexed: 05/25/2023]
Affiliation(s)
- Yusuf Yilmaz
- McMaster University Faculty of Health Sciences McMaster Education Research, Innovation and Theory (MERIT) Program, Hamilton, Ontario Canada
- Department of Medical Education, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Sarrah Lal
- McMaster University Faculty of Health Sciences McMaster Education Research, Innovation and Theory (MERIT) Program, Hamilton, Ontario Canada
- MacPherson Leadership in Teaching and Learning Fellowship, McMaster University, Hamilton, Ontarion Canada
- Michael G. DeGroote Initiative for Innovation in Healthcare and Division of Education & Innovation, Department of Medicine, McMaster University, Hamilton, Ontario Canada
| | - X. Catherine Tong
- Department of Family Medicine, McMaster University, Hamilton, Ontario Canada
| | - Michelle Howard
- Department of Family Medicine, McMaster University, Hamilton, Ontario Canada
| | - Sharon Bal
- Department of Family Medicine, McMaster University, Hamilton, Ontario Canada
| | - Ilana Bayer
- MacPherson Leadership in Teaching and Learning Fellowship, McMaster University, Hamilton, Ontarion Canada
- Department of Pathology and Molecular Medicine, Faculty of Health Sciences Learning Technologies Lab, McMaster University, Hamilton, Ontario Canada
| | - Sandra Monteiro
- McMaster University Faculty of Health Sciences McMaster Education Research, Innovation and Theory (MERIT) Program, Hamilton, Ontario Canada
- Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario Canada
| | - Teresa M. Chan
- McMaster University Faculty of Health Sciences McMaster Education Research, Innovation and Theory (MERIT) Program, Hamilton, Ontario Canada
- Program for Faculty Development, Faculty of Health Sciences, McMaster University, Hamilton, Ontario Canada
- Division of Emergency Medicine, Department of Medicine, McMaster University, Hamilton, Ontario Canada
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Koo GC, Blake JT, Shah K, Staruch MJ, Dumont F, Wunderler D, Sanchez M, McManus OB, Sirotina-Meisher A, Fischer P, Boltz RC, Goetz MA, Baker R, Bao J, Kayser F, Rupprecht KM, Parsons WH, Tong XC, Ita IE, Pivnichny J, Vincent S, Cunningham P, Hora D, Feeney W, Kaczorowski G. Correolide and derivatives are novel immunosuppressants blocking the lymphocyte Kv1.3 potassium channels. Cell Immunol 1999; 197:99-107. [PMID: 10607427 DOI: 10.1006/cimm.1999.1569] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The voltage-gated potassium channel, Kv1.3, is specifically expressed on human lymphocytes, where it controls membrane potential and calcium influx. Blockade of Kv1.3 channels by margatoxin was previously shown to prevent T cell activation and attenuate immune responses in vivo. In the present study, a triterpene natural product, correolide, was found to block Kv1.3 channels in human and miniswine T cells by electrophysiological characterization. T cell activation events, such as anti-CD3-induced calcium elevation, IL-2 production, and proliferation were inhibited by correolide in a dose-dependent manner. More potent analogs were evaluated for pharmacokinetic profiles and subsequently tested in a delayed-type hypersensitivity (DTH) response to tuberculin in the miniswine. Two compounds were dosed orally, iv, or im, and both compounds suppressed DTH responses, demonstrating that small molecule blockers of Kv1.3 channels can act as immunosuppressive agents in vivo. These studies establish correolide and its derivatives as novel immunosuppressants.
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Affiliation(s)
- G C Koo
- Merck Research Laboratories, Rahway, New Jersey, 07065, USA
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