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1.
Teach Learn Med ; : 1-9, 2024 Sep 16.
Artículo en Inglés | MEDLINE | ID: mdl-39282912

RESUMEN

PHENOMENON: Marginalized individuals in medicine face many structural inequities which can have enduring consequences on their progress. Therefore, inequity must be addressed by dismantling underlying unjust policies, environments, and curricula. However, once these injustices have been taken apart, how do we build more just systems from the rubble? Many current strategies to address this question have foundational values of urgency, solutionism, and top-down leadership. APPROACH: This paper explores a counternarrative: Design Justice. As a set of guiding principles, Design Justice centers the experiences and perspectives of marginalized individuals and communities. These principles include mutual accountability and transparency, co-ownership, and community-led outcomes, and honoring local, traditional, Indigenous knowledge. FINDINGS: Rooted in critical scholarship and critical design, Design Justice recognizes the interconnectedness of various forms of marginalization and works to critically examine power dynamics that exist in every design process. These co-created principles act as practical guardrails, directing progress toward justice. INSIGHTS: This paper begins with an overview of Design Justice's history in critical scholarship and critical design, providing foundational background knowledge for medical educators, scholars, and leaders in key concepts of justice and design. We explore how the Design Justice principles were developed and have been applied across sectors, highlighting its applications, including education applications. Finally, we raise critical questions about medical education prompted by Design Justice.

2.
J Pediatr Hematol Oncol ; 43(4): e498-e500, 2021 05 01.
Artículo en Inglés | MEDLINE | ID: mdl-32590419

RESUMEN

Epstein-Barr virus-positive diffuse large B-cell lymphoma (EBV+ DLBCL) in pediatrics most commonly occurs as an iatrogenic immunodeficiency-associated lymphoproliferative disease. We report an 18-year-old female individual with refractory systemic juvenile idiopathic arthritis, treated with multiple immunosuppressive agents, who was diagnosed with stage III, EBV+ DLBCL. The patient achieved sustained complete remission after 4 weekly doses of rituximab monotherapy and reduction of immunosuppression. This case suggests that a post-transplant lymphoproliferative disease-like treatment approach can be a safe and effective therapy in a nontransplant, yet severely immunosuppressed, patient with EBV+ DLBCL.


Asunto(s)
Antineoplásicos Inmunológicos/uso terapéutico , Artritis Juvenil/complicaciones , Infecciones por Virus de Epstein-Barr/complicaciones , Linfoma de Células B Grandes Difuso/complicaciones , Linfoma de Células B Grandes Difuso/tratamiento farmacológico , Rituximab/uso terapéutico , Adolescente , Artritis Juvenil/tratamiento farmacológico , Femenino , Humanos , Inmunosupresores/uso terapéutico , Resultado del Tratamiento
3.
J Am Acad Dermatol ; 79(1): 47-51.e2, 2018 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29535035

RESUMEN

BACKGROUND: Morphea or localized scleroderma is an inflammatory disorder resulting in fibrosis of the skin and subcutaneous tissues. Joint contractures, arthralgias, and functional compromise are recognized associations of pediatric morphea. The co-existence of inflammatory arthritis and morphea is not well-described in the literature. OBJECTIVE: To investigate the relationship between pediatric morphea and inflammatory arthritis with regards to cutaneous, musculoskeletal, and laboratory findings and treatment regimens. METHODS: A systematic retrospective chart review of 53 patients with pediatric morphea was performed and analyzed for morphea subtypes, arthritic joint involvement, serum autoantibodies, and therapeutic interventions. RESULTS: Eleven out of 53 patients had polyarthritis that involved joints unrelated to the site of the cutaneous morphea. These patients were mostly girls with either the linear or generalized subtypes of morphea. Serum levels of antinuclear antibodies were more significantly elevated in patients with arthritis. All children were treated with methotrexate in addition to other systemic or topical immunosuppressive agents. LIMITATIONS: This was a small, single-center retrospective study. CONCLUSION: Pediatric morphea co-existed with inflammatory arthritis in 11 of 53 children. Further understanding and appreciation of this relationship may direct more intensive therapy and musculoskeletal screening.


Asunto(s)
Artritis/diagnóstico , Artritis/epidemiología , Esclerodermia Localizada/diagnóstico , Esclerodermia Localizada/epidemiología , Adolescente , Distribución por Edad , Artritis/tratamiento farmacológico , Niño , Preescolar , Estudios de Cohortes , Comorbilidad , Femenino , Humanos , Inmunosupresores/administración & dosificación , Incidencia , Masculino , Metotrexato/administración & dosificación , Pediatría , Pronóstico , Estudios Retrospectivos , Esclerodermia Localizada/tratamiento farmacológico , Índice de Severidad de la Enfermedad , Distribución por Sexo
4.
J Immunol ; 191(3): 1055-62, 2013 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-23794629

RESUMEN

The class A macrophage scavenger receptor Msr1 (SR-A, CD204) has been reported to participate in the maintenance of immunological tolerance. We investigated the role of Msr1 in a mouse model of autoantibody-dependent arthritis. Genetic deficiency of Msr1 in K/BxN TCR transgenic mice decreased the incidence and severity of arthritis because of decreased autoantibody production. Despite normal initial activation of autoreactive CD4(+) T cells, potentially autoreactive B cells in Msr1(-/-) K/BxN mice retained a naive phenotype and did not expand. This was not due to an intrinsic B cell defect. Rather, we found that macrophages lacking Msr1 were inefficient at taking up the key autoantigen glucose-6-phosphate isomerase and that Msr1-deficient mice had elevated serum concentrations of glucose-6-phosphate isomerase. Arthritis developed normally when bone marrow from Msr1(-/-) K/BxN mice was transplanted into hosts whose macrophages did express Msr1. Thus, Msr1 can regulate the concentration of a soluble autoantigen. In this model, the absence of Msr1 led to higher levels of soluble autoantigen and protected mice from developing pathogenic autoantibodies, likely because of altered cognate interactions of autoreactive T and B cells with impaired differentiation of follicular Th cells.


Asunto(s)
Autoanticuerpos/inmunología , Autoantígenos/inmunología , Autoinmunidad , Linfocitos B/inmunología , Glucosa-6-Fosfato Isomerasa/inmunología , Receptores Depuradores de Clase A/metabolismo , Animales , Artritis Experimental/inmunología , Autoanticuerpos/biosíntesis , Autoantígenos/metabolismo , Linfocitos T CD4-Positivos/inmunología , Glucosa-6-Fosfato Isomerasa/sangre , Glucosa-6-Fosfato Isomerasa/metabolismo , Activación de Linfocitos , Macrófagos/inmunología , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Receptores Depuradores de Clase A/genética , Receptores Depuradores de Clase A/inmunología
5.
Front Pediatr ; 12: 1376088, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38948240

RESUMEN

Neuromyelitis optica spectrum disorder (NMOSD) is a rare inflammatory disorder of the central nervous system (CNS) that is known to be associated with other neurologic and organ-specific autoimmune conditions. There has been increasing recognition of the association between NMOSD and systemic autoimmune disease, most commonly systemic lupus erythematosus and Sjogren's syndrome. We report a case of an adolescent presenting with anti-melanoma differentiation-associated protein 5 juvenile dermatomyositis (anti-MDA5 JDM) and NMOSD, exhibiting clinical features of myelitis, polyarthritis, myositis, and skin involvement. Currently, only two other published cases have described NMOSD associated with anti-MDA5 dermatomyositis, both in adults. To the best of our knowledge, this is the first reported case in an adolescent patient.

6.
Arthritis Rheumatol ; 2024 Sep 08.
Artículo en Inglés | MEDLINE | ID: mdl-39245963

RESUMEN

OBJECTIVE: Rheumatologic disease-associated hemophagocytic lymphohistiocytosis (HLH), a rare, life-threatening, systemic hyperinflammatory syndrome, occurs as a complication of underlying rheumatologic disease. Real-world evidence is lacking on emapalumab, a fully human monoclonal antibody that neutralizes the proinflammatory cytokine interferon-gamma, approved for treating patients with primary HLH. METHODS: REAL-HLH, a retrospective medical chart review study conducted across 33 US hospitals, assessed real-world treatment patterns and outcomes in patients with HLH treated with ≥1 dose of emapalumab between November 20, 2018, and October 31, 2021. Data are presented for the subset of patients with rheumatologic disease-associated HLH. RESULTS: Fifteen of 105 patients (14.3%) had rheumatologic disease-associated HLH. Of these, 9 (60.0%) had systemic juvenile idiopathic arthritis, and 1 (6.7%) had adult-onset Still's disease. Median (range) age at HLH diagnosis was 5 (0.9-39) years. Most (9/15; 60.0%) patients initiated emapalumab in an intensive care unit. Emapalumab was most frequently initiated for treating refractory or recurrent (10/15; 66.7%) disease. Most patients received HLH-related therapies prior to (10/15; 66.7%) and concurrently (15/15; 100.0%) with emapalumab. Emapalumab-containing regimens stabilized or achieved physician-determined normalization of most laboratory parameters including fibrinogen (11/13; 84.6%), chemokine ligand 9 (7/8; 87.5%), and absolute neutrophil count (6/10; 60%), and reduced glucocorticoid dose by 80%. Overall survival and 12-month survival probability from emapalumab initiation were 86.7%. CONCLUSION: Emapalumab-containing regimens stabilized or normalized most key laboratory parameters, reduced glucocorticoid dose, and were associated with low disease-related mortality, thereby demonstrating potential benefits in patients with rheumatologic disease-associated HLH.

7.
Arthritis Care Res (Hoboken) ; 75(10): 2082-2087, 2023 10.
Artículo en Inglés | MEDLINE | ID: mdl-37052526

RESUMEN

OBJECTIVE: Concern exists that medications used to treat patients with systemic juvenile idiopathic arthritis (JIA), particularly interleukin (IL)-1 and IL-6 blocking agents, might be causing adverse drug reactions and lung disease (systemic JIA-LD). Carriage of HLA-DRB1*15 has been reported as a risk factor for adverse drug reactions among patients with systemic JIA. We performed a retrospective chart review to evaluate these factors at our center. METHODS: We reviewed the records of 86 subjects with systemic JIA followed for at least 6 months between 1996 and 2022. HLA typing was performed in 23 of the subjects. We compared characteristics of patients with or without eosinophilia. Among patients with HLA typing, we compared clinical characteristics of subjects with or without DRB1*15 and with or without systemic JIA-LD. RESULTS: Among the 23 patients with HLA typing, 74% carried DRB1*15, and 63% of patients without systemic JIA-LD carried DRB1*15. Seven subjects had systemic JIA-LD, all of whom carried DRB1*15. Patients with systemic JIA-LD were younger at the time of diagnosis and more likely to have had macrophage activation syndrome. Exposure to IL-1 and IL-6 blockers was common, occurring in 95% of patients. Eosinophilia occurred in 39% of patients with systemic JIA, often before IL-1 or IL-6 blockade. Eosinophilia was associated with adverse drug reactions and macrophage activation syndrome. There was 1 death, unrelated to active systemic JIA disease. CONCLUSION: Carriage of DRB1*15 was more common in this cohort of patients with systemic JIA than in the general population. Eosinophilia and systemic JIA-LD were more common among patients with severe systemic JIA complicated by macrophage activation syndrome.


Asunto(s)
Artritis Juvenil , Eosinofilia , Síndrome de Activación Macrofágica , Humanos , Cadenas HLA-DRB1/genética , Artritis Juvenil/complicaciones , Artritis Juvenil/diagnóstico , Artritis Juvenil/tratamiento farmacológico , Estudios Retrospectivos , Interleucina-6 , Predisposición Genética a la Enfermedad , Eosinofilia/epidemiología , Eosinofilia/genética
8.
Pediatr Rheumatol Online J ; 20(1): 70, 2022 Aug 20.
Artículo en Inglés | MEDLINE | ID: mdl-35987646

RESUMEN

BACKGROUND: Non-criteria antiphospholipid antibodies (NC-aPL) are a relatively undefined subgroup of antiphospholipid antibodies (aPL). Knowledge about NC-aPL in adults is limited and even less is known in pediatric patients. Routine tests for antiphospholipid syndrome (APS)-a clinical state marked by the presence of aPL in association with vascular thrombosis-usually include lupus anticoagulant (LAC), anti-cardiolipin (aCL) and -beta-2 glycoprotein I (aß2GPI). LAC is a functional screen for prothrombotic aPL, while the latter tests identify specific autoantibodies. Specific targets of NC-aPL include, but are not limited to, phosphatidylethanolamine, phosphatidylserine, and prothrombin. PRESENTATION OF CASES: We present single-center data from eight pediatric patients with NC-aPL identified during a three-year period. All patients had presenting features raising suspicion for APS. Most patients were female with a primary rheumatic disease. One patient had a stroke. Another patient had alveolar hemorrhage and pulmonary hypertension. Raynaud's phenomenon, rashes involving distal extremities, and headaches were common. Most patients had a positive LAC, yet their routine aPL tests were negative, prompting testing for NC-aPL. CONCLUSIONS: Our findings suggest NC-aPL are associated with typical signs and symptoms of APS in pediatric patients. Pediatricians and pediatric subspecialists should consider NC-aPL when clinical suspicion is high and routine aPL tests are negative, particularly when LAC is positive. While guidelines for NC-aPL do not yet exist for children or adults, these autoantibodies have pathogenic potential. Actionable items could include evaluation for the presence of other (primary) rheumatic diseases, and consultation with hematologists and/or obstetricians regarding anticoagulation/platelet inhibition and thrombosis education. Future guidelines regarding NC-aPL will only be generated by gathering more data, ideally prospectively.


Asunto(s)
Síndrome Antifosfolípido , Enfermedades Reumáticas , Trombosis , Adulto , Anticuerpos Antifosfolípidos , Síndrome Antifosfolípido/complicaciones , Síndrome Antifosfolípido/diagnóstico , Autoanticuerpos , Niño , Femenino , Humanos , Inhibidor de Coagulación del Lupus , Masculino , Enfermedades Reumáticas/complicaciones , Enfermedades Reumáticas/diagnóstico
9.
Acad Med ; 96(7S): S50-S55, 2021 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-34183602

RESUMEN

PROBLEM: Assessment has been the Achilles heel of competency-based medical education. It requires a program of assessment in which outcomes are clearly defined, students know where they are in the development of the competencies, and what the next steps are to attaining them. Achieving this goal in a feasible manner has been elusive with traditional assessment methods alone. The Education in Pediatrics Across the Continuum (EPAC) program at the University of Minnesota developed a robust program of assessment that has utility and recognizes when students are ready for the undergraduate to graduate medical education transition. APPROACH: The authors developed a learner-driven program of assessment in the foundational clinical training of medical students in the EPAC program based on the Core Entrustable Professional Activities for Entering Residency (Core EPAs). Frequent workplace-based assessments, coupled with summative assessments, informed a quarterly clinical competency committee and individualized learning plans. The data were displayed on real time dashboards for the students to review. OUTCOMES: Over 4 cohorts from 2015 to 2019, students (n = 13) averaged approximately 200 discrete Core EPA workplace-based assessments during their foundational clinical training year. Assessments were completed by an average of 9 different preceptors each month across 8 different specialties. The data were displayed in a way students and faculty could monitor development and inform a clinical competency committee's ability to determine readiness to transition to advanced clinical rotations and residency. NEXT STEPS: The next steps include continuing to scale the program of assessment to a larger cohort of students.


Asunto(s)
Prácticas Clínicas , Competencia Clínica , Educación Basada en Competencias/métodos , Educación de Pregrado en Medicina/métodos , Pediatría/educación , Evaluación Educacional/métodos , Humanos , Curva de Aprendizaje
10.
Acad Med ; 96(7S): S70-S75, 2021 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-34183605

RESUMEN

PURPOSE: To explore validity evidence for the use of entrustable professional activities (EPAs) as an assessment framework in medical education. METHOD: Formative assessments on the 13 Core EPAs for entering residency were collected for 4 cohorts of students over a 9- to 12-month longitudinal integrated clerkship as part of the Education in Pediatrics Across the Continuum pilot at the University of Minnesota Medical School. The students requested assessments from clinical supervisors based on direct observation while engaging in patient care together. Based on each observation, the faculty member rated the student on a 9-point scale corresponding to levels of supervision required. Six EPAs were included in the present analyses. Student ratings were depicted as curves describing their performance over time; regression models were employed to fit the curves. The unit of analyses for the learning curves was observations rather than individual students. RESULTS: (1) Frequent assessments on EPAs provided a developmental picture of competence consistent with the negative exponential learning curve theory; (2) This finding was true across a variety of EPAs and across students; and (3) The time to attain the threshold level of performance on the EPA for entrustment varied by student and EPA. CONCLUSIONS: The results provide validity evidence for an EPA-based program of assessment. Students assessed using multiple observations performing the Core EPAs for entering residency demonstrate classic developmental progression toward the desired level of competence resulting in entrustment decisions. Future work with larger data samples will allow further psychometric analyses of assessment of EPAs.


Asunto(s)
Competencia Clínica , Educación Basada en Competencias , Educación de Pregrado en Medicina , Pediatría/educación , Evaluación Educacional/métodos , Humanos , Reproducibilidad de los Resultados
11.
Acad Med ; 96(7S): S42-S49, 2021 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-34183601

RESUMEN

PURPOSE: To describe trajectories in level of supervision ratings for linked entrustable professional activities (EPAs) among pediatric learners in medical school, residency, fellowship. METHOD: The authors performed secondary analyses of 3 linked datasets of level of supervision ratings for the Core EPAs for Entering Residency, the General Pediatrics EPAs, and the Subspecialty Pediatrics EPAs. After identifying 9 activities in common across training stages and aligning the level of entrustment-supervision scales across the datasets, piecewise ordinal and linear mixed effects models were fitted to characterize trajectories of supervision ratings. RESULTS: Within each training period, learners were rated as needing less supervision over time in each activity. When transitioning from medical school to residency or during the first year of residency, learners were rated as needing greater supervision in activities related to patient management, teamwork, emergent care, and public health/QI than in earlier periods. When transitioning from residency to fellowship, learners were always rated as needing greater supervision than they had been accorded at the end of residency and sometimes even more than they had been accorded at the start of residency. CONCLUSIONS: Although development over training is often imagined as continuous and monotonically increasing competence, this study provides empirical evidence supporting the idea that entrustment is a set of discrete decisions. The relaxation of supervision in training is not a linear process. Even with a seamless curriculum, supervision is tightly bound to the training setting. Several explanations for these findings are discussed.


Asunto(s)
Competencia Clínica , Educación Basada en Competencias , Educación de Postgrado en Medicina , Educación de Pregrado en Medicina , Pediatría/educación , Becas , Humanos , Internado y Residencia
12.
BMJ Open Qual ; 10(4)2021 12.
Artículo en Inglés | MEDLINE | ID: mdl-34949581

RESUMEN

Our paediatric rheumatology clinic has experienced inefficient patient flow. Our aim was to reduce mean wait time and minimise variation for patients. Baseline data showed that most waiting occurs after a patient has been roomed, while waiting for the physician. Wait time was not associated with a patient's age, time of day, day of the week or individual physician. We implemented a checkout sheet and staggered start times. After a series of plan-do-study-act cycles, we observed an initial 26% reduction in the variation of wait time and a final 17% reduction in the mean wait time. There was no impact on patient-physician contact time. Overall, we demonstrate how process improvement methodology and tools were used to reduce patient wait time in our clinic, adding to the body of literature on process improvement in an ambulatory setting.


Asunto(s)
Mejoramiento de la Calidad , Reumatología , Instituciones de Atención Ambulatoria , Niño , Humanos , Satisfacción del Paciente , Listas de Espera
13.
Acad Pediatr ; 20(1): 97-103, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31404708

RESUMEN

OBJECTIVE: Research on how medical students choose a career in pediatrics is either dated or conflated with primary care career choice. Capitalizing on student participation in an innovative, time-variable, competency based pathway program, Education in Pediatrics Across the Continuum (EPAC), the authors explored the process of career decision-making in students at 5 medical schools (including 4 EPAC sites) who begin medical school with an interest in pediatrics. METHODS: Individual, semistructured interviews were conducted with students in 5 groups: Group 1: accepted into EPAC, n = 8; Group 2: accepted into EPAC, opted-out, n = 4; Group 3 applied to EPAC, not accepted, pursued pediatrics, n = 4; Group 4: applied to EPAC, not accepted, did not pursue pediatrics, n = 3; Group 5: pursued pediatrics at a non-EPAC site, n = 6. Data collection and analysis occurred iteratively, with inductive coding of data revealing patterns in data explored in subsequent interviews and refined in the final analysis. RESULTS: All students described intrinsic guiding principles, that is, "doing what you love," that attracted them to pediatrics. They described extrinsic, phase-specific experiences before medical school, before clerkship, and in clerkship that shaped their perceptions of a career in pediatrics and shed light on collective values of different specialties. Student's assessment of how their guiding principles aligned with the collective values of pediatrics, which students encountered in the clerkship phase, was a key to making career decisions. CONCLUSIONS: Intrinsic and extrinsic factors do not act alone but interact in clerkships, and influence career choice of students who enter medical school with an interest in pediatrics.


Asunto(s)
Selección de Profesión , Pediatría/educación , Facultades de Medicina , Adulto , Femenino , Humanos , Entrevistas como Asunto , Masculino , Proyectos Piloto , Investigación Cualitativa , Estados Unidos
14.
J Pediatr Pharmacol Ther ; 25(8): 705-708, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33214781

RESUMEN

OBJECTIVES: To compare infusion reaction rates between rapid infliximab (REMICADE, Janssen Biotech Inc) infusions and previous standard 2- to 3-hour infusions; additionally, to assess patient satisfaction and reduction in chair time associated with rapid infliximab infusions. METHODS: Pediatric rheumatology and gastroenterology patients receiving maintenance infliximab therapy using a standard 2- to 3-hour titrated infusion had the opportunity to enroll in the non-titrated rapid 1-hour infusion protocol following tolerance of induction dosing at 0, 2, and 6 weeks. Patients were included from December 1, 2017, to March 31, 2018, via retrospective chart review and patient satisfaction surveys. RESULTS: Data were collected on 55 patients receiving a total of 160 rapid infliximab infusions. There were 2 infusion reactions during the enrollment and data collection period, resulting in an overall infusion reaction rate of 1.3%. The patient satisfaction survey results showed all patients were at minimum satisfied with the information provided regarding rapid infliximab, decreased time spent in clinic, ease of scheduling, and overall process. CONCLUSIONS: Our data suggest rapid infliximab infusions are safe in pediatric rheumatology and gastroenterology patients receiving maintenance infliximab infusion therapy. The overall infusion reaction rate of 1.3% in this study is well below the accepted infusion reaction rate of standard-length infliximab infusions of 2% to 3%.

15.
Artículo en Inglés | MEDLINE | ID: mdl-30601761

RESUMEN

IgG4-related hypophysitis is an important diagnostic consideration in patients with a pituitary mass or pituitary dysfunction and can initially present with headaches, visual field deficits and/or endocrine dysfunction. Isolated IgG4-related pituitary disease is rare, with most cases of IgG4-related disease involving additional organ systems. We report the case of a teenage female patient with isolated IgG4-related hypophysitis, diagnosed after initially presenting with headaches. Our patient had no presenting endocrinologic abnormalities. She was treated with surgical resection, prednisolone and rituximab with no further progression of disease and sustained normal endocrine function. This case, the youngest described patient with isolated IgG4-related hypophysitis and uniquely lacking endocrinologic abnormalities, adds to the limited reports of isolated pituitary disease. The use of rituximab for isolated pituitary disease has never been described. While IgG4-related hypophysitis has been increasingly recognized, substantial evidence concerning the appropriate treatment and follow-up of these patients is largely lacking. Learning points: IgG4-related hypophysitis most often occurs in the setting of additional organ involvement but can be an isolated finding. This diagnosis should therefore be considered in a patient presenting with pituitary abnormalities. Most patients with IgG4-related hypophysitis will have abnormal pituitary function, but normal functioning does not exclude this diagnosis. Corticosteroids have been the mainstay of therapy for IgG4-related disease, with other immunosuppressive regimens being reserved for refractory cases. Further research is needed to understand the effectiveness of corticosteroid-sparing regimens and whether there is utility in using these agents as first-line therapies.

16.
Arthritis Rheumatol ; 66(4): 852-62, 2014 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-24757138

RESUMEN

OBJECTIVE: Arthritis and valvular carditis coexist in several human rheumatic diseases, including systemic lupus erythematosus, rheumatic fever, and rheumatoid arthritis. T cell receptor-transgenic K/BxN mice develop spontaneous autoantibody-associated arthritis and valvular carditis. The common Fc receptor γ (FcRγ) signaling chain is required for carditis to develop in K/BxN mice. FcRγ pairs with numerous receptors in a variety of cells. The aim of this study was to identify the FcRγ-associated receptors and Fcγ receptor (FcγR)-expressing cells that mediate valvular carditis in this model. METHODS: We bred K/BxN mice lacking the genes that encode activating Fcγ receptors (FcγRI, FcγRIII, and FcγRIV), and we assessed these mice for valvular carditis. We similarly evaluated complement component C3-deficient K/BxN mice. Immunohistochemistry, bone marrow transplantation, and macrophage depletion were used to define the key FcRγ-expressing cell type. RESULTS: Genetic deficiency of only one of the activating Fcγ receptors did not prevent carditis, whereas deficiency of all 3 activating Fcγ receptors did. Further analysis demonstrated that FcγRIII and FcγRIV were the key drivers of valve inflammation; FcγRI was dispensable. C3 was not required. FcRγ expression by radioresistant cells was critical for valvular carditis to develop, and further analysis indicated that macrophages were the key candidate FcγR-expressing effectors of carditis. CONCLUSION: FcγRIII and FcγRIV act redundantly to promote valvular carditis in K/BxN mice with systemic autoantibody-associated arthritis. Macrophage depletion reduced the severity of valve inflammation. These findings suggest that pathogenic autoantibodies engage Fcγ receptors on macrophages to drive valvular carditis. Our study provides new insight into the pathogenesis of cardiovascular inflammation in the setting of autoantibody-associated chronic inflammatory diseases.


Asunto(s)
Artritis Experimental/inmunología , Artritis Reumatoide/inmunología , Macrófagos/inmunología , Miocarditis/inmunología , Receptores de IgG/metabolismo , Animales , Artritis Experimental/genética , Artritis Experimental/metabolismo , Artritis Reumatoide/genética , Artritis Reumatoide/metabolismo , Autoanticuerpos/inmunología , Macrófagos/metabolismo , Ratones , Ratones Transgénicos , Miocarditis/genética , Miocarditis/metabolismo , Receptores de IgG/genética , Linfocitos T/inmunología , Linfocitos T/metabolismo
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