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1.
Med Educ ; 2024 May 03.
Artículo en Inglés | MEDLINE | ID: mdl-38700082

RESUMEN

BACKGROUND: Resource scarcity in health professions education (HPE) demands rigorous consideration of costs. Yet, thus far, we have been unable to completely and consistently identify the costs of HPE. To address this knowledge gap and enable use of economic evidence in decision making, a detailed overview of all existing costs and approaches to cost identification in HPE is needed. OBJECTIVES: This review summarises the diversity of costs, cost perspectives and cost identification methods used in economic research of HPE to answer the following questions: which educational topics, costs, cost perspectives and cost identification methods are being investigated in HPE literature? METHODS: This investigation followed the Joanna Briggs Institute guidelines for scoping reviews. PubMed, ERIC, CINAHL and PsycINFO were iteratively searched for English language publications between 2012 and 2022 that reported costs of HPE. Data was extracted for study characteristics, educational context and economic methodology. RESULTS: A total of 136 articles of original research on the costs of educating all major licence healthcare professionals were included. A diffuse interest in costs is reflected in publications from 93 distinct journals and by the diversity of educational topics and cost types explored. However, the majority of investigations failed to define the cost perspective (86, 63%) and cost identification methods (117, 86%) and did not demonstrate common reporting structure or cost terminology, all of which contribute to persistent inconsistencies in cost identification. CONCLUSION: The source of disharmonious cost identification in HPE is fuelled by diverse interests and divergent concepts of costs and costing methodology. Left in its current state, disharmonious cost identification will continue to limit transparency, comparison and synthesis of evidence, hamper objectivity in implementation and policy decisions and impede the efficient and sustainable allocation of resources. A research agenda must be developed, prioritised, and validated by the broader community to develop a theoretical framework for HPE cost research, define stakeholders, elicit values and preferences and chart a path toward harmonised costing.

2.
Cancer Metastasis Rev ; 40(2): 563-573, 2021 06.
Artículo en Inglés | MEDLINE | ID: mdl-33634328

RESUMEN

Platelets have an important role in tumor angiogenesis, growth, and metastasis. The reciprocal interaction between cancer and platelets results in changes of several platelet characteristics. It is becoming clear that analysis of these platelet features could offer a new strategy in the search for biomarkers of cancer. Here, we review the human studies in which platelet characteristics (e.g., count, volume, protein, and mRNA content) are investigated in early-stage cancer. The main focus of this paper is to evaluate which platelet features are suitable for the development of a blood test that could detect cancer in its early stages.


Asunto(s)
Neoplasias/sangre , Animales , Plaquetas/patología , Procesos de Crecimiento Celular/fisiología , Pruebas Hematológicas/métodos , Humanos , Metástasis de la Neoplasia , Estadificación de Neoplasias , Neoplasias/irrigación sanguínea , Neoplasias/diagnóstico , Neoplasias/patología , Neovascularización Patológica/sangre , Neovascularización Patológica/patología
3.
Med Teach ; 44(6): 636-642, 2022 06.
Artículo en Inglés | MEDLINE | ID: mdl-34928758

RESUMEN

INTRODUCTION: Inclusive educational leaders promote teacher team functioning. To support leader inclusiveness, we designed and implemented a faculty development programme focusing on leader identity formation. We investigated (1) how participants' leader identity developed throughout the programme and (2) how the design principles contributed to this process, according to participants. METHODS: A design-based research approach was followed. Participants were 7 course coordinators, leading an interdisciplinary teacher team. To study leader identity development, participants repeatedly filled out a validated questionnaire. To investigate how design principles contributed, observational field notes, facilitator debriefings, a programme evaluation questionnaire and a semi-structured focus group were used. Thematic analysis was applied for qualitative data. RESULTS: Participants gained broader views on leadership, moving from individual dominance towards engaging team members. Most participants initially experienced a deconstruction of their former leader identity and became motivated to improve leadership qualities. Competence-building, reflecting and receiving feedback on workplace experiences, and practicing in a safe environment were perceived to be key for identity development. CONCLUSIONS: We developed and evaluated a leader identity programme which can convert teachers' classic leadership views towards views incorporating social interactions and relationships. We demonstrated how social interactions provide opportunities to learn from pe.ers in the work environment.


Asunto(s)
Docentes , Liderazgo , Humanos
4.
Teach Learn Med ; 33(5): 498-508, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33632034

RESUMEN

PHENOMENON: Developing modern medical curricula requires collaboration between different scientific and clinical disciplines. Consequently, institutions face the daunting task to engage colleagues from different disciplines in effective team collaboration. Two aspects that are vital to the success of such teamwork are "team learning behavior" by all team members and "leader inclusiveness behavior" by the team leader. Team members display team learning behavior when they share information, build upon and integrate each other's viewpoints. The team leader can promote such team learning by exhibiting inclusiveness behavior, which aims to encourage diversity and preserve individual differences for an inclusive workplace, nurturing engagement in teamwork. There is a paucity of in-depth research on leader inclusiveness behavior in the field of medical education. This case study aimed to offer unique insight into how leader inclusiveness behavior manifests itself in a successful interdisciplinary teacher team, demonstrating team learning behavior in undergraduate medical education. APPROACH: We conducted a qualitative, ethnographic case study using different but complementary methods, including observations, interviews and a documentary analysis of email communication. By means of purposive sampling, we selected an existing interdisciplinary teacher team that was responsible for an undergraduate medical course at Maastricht University, the Netherlands, and that was known to be successful. Chaired by a physician, the team included planning group members and tutors with medical, biomedical, and social sciences backgrounds as well as student-representatives. In the course of one academic year, 23 meetings were observed and recorded, informal interviews were conducted, and over 100 email conversations were collected. All data were submitted to a directed content analysis based on team learning and leader inclusiveness concepts. FINDINGS: Leader inclusiveness behavior became evident from verbal and non-verbal interactions between the team leader and team members. Leader inclusiveness behavior that facilitated team learning behavior manifested itself in five actions undertaken by the team leader: coordinating, explicating, inviting, connecting, and reflecting. Similarly, team members facilitated team learning behavior by participating actively, speaking up behavior, and mimicking leader inclusiveness behavior. These behaviors demonstrated engagement and feelings of inclusion, and reinforced leader inclusiveness behavior by creating additional opportunities for the leader to exhibit such behavior. INSIGHTS: This case study responds to the need for inclusive leadership approaches in medical education. Our findings build upon theoretical knowledge on team learning and leader inclusiveness concepts. By studying behaviors, interactions and documents we obtained in-depth information on leader inclusiveness. Our findings are unique in that they demonstrate how leader inclusiveness behavior manifests itself when leaders interact with their team members. This study provides health professionals who are active in education with practical suggestions on how to act as a successful and inclusive leader. Finally, the behaviors identified open up avenues for future professional development initiatives and future research on team leadership.Supplemental data for this article is available online at here.


Asunto(s)
Curriculum , Aprendizaje , Personal de Salud , Humanos , Liderazgo , Grupo de Atención al Paciente , Investigación Cualitativa
5.
Int J Mol Sci ; 22(15)2021 Jul 30.
Artículo en Inglés | MEDLINE | ID: mdl-34361002

RESUMEN

Platelets are involved in tumor angiogenesis and cancer progression. Previous studies indicated that cancer could affect platelet content. In the current study, we investigated whether cancer-associated proteins can be discerned in the platelets of cancer patients, and whether antitumor treatment may affect the platelet proteome. Platelets were isolated from nine patients with different cancer types and ten healthy volunteers. From three patients, platelets were isolated before and after the start of antitumor treatment. Mass spectrometry-based proteomics of gel-fractionated platelet proteins were used to compare patients versus controls and before and after treatment initiation. A total of 4059 proteins were detected, of which 50 were significantly more abundant in patients, and 36 more in healthy volunteers. Eight of these proteins overlapped with our previous cancer platelet proteomics study. From these data, we selected potential biomarkers of cancer including six upregulated proteins (RNF213, CTSG, PGLYRP1, RPL8, S100A8, S100A9) and two downregulated proteins (GPX1, TNS1). Antitumor treatment resulted in increased levels of 432 proteins and decreased levels of 189 proteins. In conclusion, the platelet proteome may be affected in cancer patients and platelets are a potential source of cancer biomarkers. In addition, we found in a small group of patients that anticancer treatment significantly changes the platelet proteome.


Asunto(s)
Plaquetas/metabolismo , Neoplasias del Sistema Digestivo/sangre , Proteoma/metabolismo , Anciano , Antineoplásicos/uso terapéutico , Biomarcadores de Tumor/sangre , Biomarcadores de Tumor/genética , Biomarcadores de Tumor/metabolismo , Neoplasias del Sistema Digestivo/tratamiento farmacológico , Neoplasias del Sistema Digestivo/genética , Neoplasias del Sistema Digestivo/metabolismo , Femenino , Humanos , Masculino , Persona de Mediana Edad , Proteoma/genética
6.
Adv Health Sci Educ Theory Pract ; 25(2): 363-382, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-31598883

RESUMEN

Medical school selection is currently in the paradoxical situation in which selection tools may predict study outcomes, but which constructs are actually doing the predicting is unknown (the 'black box of selection'). Therefore, our research focused on those constructs, answering the question: do the internal structures of the tests in an outcome-based selection procedure reflect the content that was intended to be measured? Downing's validity framework was applied to organize evidence for construct validity, focusing on evidence related to content and internal structure. The applied selection procedure was a multi-tool, CanMEDS-based procedure comprised of a video-based situational judgement test (focused on (inter)personal competencies), and a written aptitude test (reflecting a broader array of CanMEDS competencies). First, we examined content-related evidence pertaining to the creation and application of the competency-based selection blueprint and found that the set-up of the selection procedure was a robust, transparent and replicable process. Second, the internal structure of the selection tests was investigated by connecting applicants' performance on the selection tests to the predetermined blueprint using cognitive diagnostic modeling. The data indicate 89% overlap between the expected and measured constructs. Our results support the notion that the focus placed on creating the right content and following a competency-blueprint was effective in terms of internal structure: most items measured what they were intended to measure. This way of linking a predetermined blueprint to the applicants' results sheds light into the 'black box of selection' and can be used to support the construct validity of selection procedures.


Asunto(s)
Juicio , Criterios de Admisión Escolar , Pruebas de Aptitud , Femenino , Humanos , Masculino , Países Bajos , Facultades de Medicina , Estudiantes de Medicina , Grabación en Video
7.
Angiogenesis ; 22(1): 1-2, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-30341541

RESUMEN

We would like to promote the fact that platelets are increasingly emerging as a rich source of potential biomarkers for cancer. Blood platelets contain vast amounts of bioactive proteins, such as growth factors, chemokines, and cytokines. These proteins are either synthesized by the megakaryocytes that produce the platelets or are sequestered by the circulating platelets from the blood, in which case these proteins may originate from the tumor. Recent studies in patients have demonstrated that the presence of cancer influences multiple platelet characteristics (e.g., platelet count, volume, activation status, proteins, and RNA content). Interestingly, these changes happened already in early stages of the disease before metastasis had occurred. Additionally, exploiting these platelet alterations enabled discrimination of patients with early-stage cancer from healthy sex- and age-matched individuals. Therefore, we challenge clinicians and researchers to look beyond traditional fluid sources such as plasma or serum, and to take platelets and their content into account as they may become the holy grail in cancer blood biomarker research.


Asunto(s)
Biomarcadores de Tumor/sangre , Plaquetas/metabolismo , Neoplasias/sangre , Animales , Plaquetas/patología , Humanos , Neoplasias/patología
9.
Med Educ ; 52(12): 1240-1248, 2018 12.
Artículo en Inglés | MEDLINE | ID: mdl-30324680

RESUMEN

CONTEXT: Resources for medical education are becoming more constrained, whereas accountability in medical education is increasing. In this constrictive environment, medical schools need to consider and justify their selection procedures in terms of costs and benefits. To date, there have been no studies focusing on this aspect of selection. OBJECTIVES: We aimed to examine and compare the costs and benefits of two different approaches to admission into medical school: a tailored, multimethod selection process versus a lottery procedure. Our goal was to assess the relative effectiveness of each approach and to compare these in terms of benefits and costs from the perspective of the medical school. METHODS: The study was conducted at Maastricht University Medical School, at which the selection process and a weighted lottery procedure ran in parallel for 3 years (2011-2013). The costs and benefits of the selection process were compared with those of the lottery procedure over three student cohorts throughout the Bachelor's programme. The extra costs of selection represented the monetary investment of the medical school in conducting the selection procedure; the benefits were derived from the increase in income generated by the prevention of dropout and the reductions in extra costs facilitated by decreases in the repetition of blocks and objective structured clinical examinations. RESULTS: The tailor-made selection procedure cost about €139 000 when extrapolated to a full cohort of students (n = 286). The lottery procedure came with negligible costs for the medical school. However, the average benefits of selection compared with the lottery system added up to almost €207 000. CONCLUSIONS: This study not only shows that conducting a cost-benefit comparison is feasible in the context of selection for medical school, but also that an 'expensive' selection process can be cost-beneficial in comparison with an 'inexpensive' lottery system. We encourage other medical schools to examine the cost-effectiveness of their own selection processes in relation to student outcomes in order to extend knowledge on this important topic.


Asunto(s)
Análisis Costo-Beneficio , Criterios de Admisión Escolar , Facultades de Medicina/economía , Humanos , Estudiantes de Medicina
11.
BMC Med Educ ; 18(1): 214, 2018 Sep 17.
Artículo en Inglés | MEDLINE | ID: mdl-30223816

RESUMEN

BACKGROUND: Medical schools must select students from a large pool of well-qualified applicants. A challenging issue set forward in the broader literature is that of which cognitive and (inter)personal qualities should be measured to predict diverse later performance. To address this gap, we designed a 'backward chaining' approach to selection, based on the competences of a 'good doctor'. Our aim was to examine if this outcome-based selection procedure was predictive of study success in a medical bachelor program. METHODS: We designed a multi-tool selection procedure, blueprinted to the CanMEDS competency framework. The relationship between performance at selection and later study success across a three-year bachelor program was examined in three cohorts. Study results were compared between selection-positive and selection-negative (i.e. primarily rejected) students. RESULTS: Selection-positive students outperformed their selection-negative counterparts throughout the entire bachelor program on assessments measuring cognitive (e.g. written exams), (inter)personal and combined outcomes (i.e. OSCEs). Of the 30 outcome variables, selection-positive students scored significantly higher in 11 cases. Fifteen other, non-significant between-group differences were also in favor of the selection-positives. An overall comparison using a sign test indicated a significant difference between both groups (p < 0.001), despite equal pre-university GPAs. CONCLUSIONS: The use of an outcome-based selection approach seems to address some of the predictive validity limitations of commonly-used selection tools. Selection-positive students significantly outperformed their selection-negative counterparts across a range of cognitive, (inter)personal, and mixed outcomes throughout the entire three-year bachelor in medicine.


Asunto(s)
Evaluación Educacional , Criterios de Admisión Escolar , Curriculum , Humanos , Países Bajos , Facultades de Medicina
12.
Med Teach ; 38(8): 844-9, 2016 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-26805655

RESUMEN

INTRODUCTION: Up to now, student selection for medical schools is merely used to decide which applicants will be admitted. We investigated whether narrative information obtained during multiple mini-interviews (MMIs) can also be used to predict problematic study behavior. METHODS: A retrospective exploratory study was performed on students who were selected into a four-year research master's program Physician-Clinical Investigator in 2007 and 2008 (n = 60). First, counselors were asked for the most prevalent non-cognitive problems among their students. Second, MMI notes were analyzed to identify potential indicators for these problems. Third, a case-control study was performed to investigate the association between students exhibiting the non-cognitive problems and the presence of indicators for these problems in their MMI notes. RESULTS: The most prevalent non-cognitive problems concerned planning and self-reflection. Potential indicators for these problems were identified in randomly chosen MMI notes. The case-control analysis demonstrated a significant association between indicators in the notes and actual planning problems (odds ratio: 9.33, p = 0.003). No such evidence was found for self-reflection-related problems (odds ratio: 1.39, p = 0.68). CONCLUSIONS: Narrative information obtained during MMIs contains predictive indicators for planning-related problems during study. This information would be useful for early identification of students-at-risk, which would enable focused counseling and interventions to improve their academic achievement.


Asunto(s)
Aptitud , Educación de Postgrado en Medicina , Criterios de Admisión Escolar , Estudiantes de Medicina , Predicción , Humanos , Entrevistas como Asunto , Estudios Retrospectivos , Habilidades para Tomar Exámenes
15.
Br J Educ Psychol ; 93 Suppl 2: 353-367, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-36859717

RESUMEN

BACKGROUND: During self-study, students need to monitor and regulate mental effort to replete working memory resources and optimize learning results. Taking breaks during self-study could be an effective effort regulation strategy. However, little is known about how breaktaking relates to self-regulated learning. AIMS: We investigated the effects of taking systematic or self-regulated breaks on mental effort, task experiences and task completion in real-life study sessions for 1 day. SAMPLE: Eighty-seven bachelor's and master's students from a Dutch University. METHODS: Students participated in an online intervention during their self-study. In the self-regulated-break condition (n = 35), students self-decided when to take a break; in the systematic break conditions, students took either a 6-min break after every 24-min study block (systematic-long or 'Pomodoro technique', n = 25) or a 3-min break after every 12-min study block (systematic-short, n = 27). RESULTS: Students had longer study sessions and breaks when self-regulating. This was associated with higher levels of fatigue and distractedness, and lower levels of concentration and motivation compared to those in the systematic conditions. We found no difference between groups in invested mental effort or task completion. CONCLUSIONS: Taking pre-determined, systematic breaks during a study session had mood benefits and appeared to have efficiency benefits (i.e., similar task completion in shorter time) over taking self-regulated breaks. Measuring how mental effort dynamically fluctuates over time and how effort spent on the learning task differs from effort spent on regulating break-taking requires further research.


Asunto(s)
Motivación , Estudiantes , Humanos , Aprendizaje , Universidades
16.
BMJ Open ; 13(10): e074410, 2023 10 17.
Artículo en Inglés | MEDLINE | ID: mdl-37848291

RESUMEN

INTRODUCTION: Profound changes in the healthcare sector and the growing, global shortage of healthcare workers are driving the demand to update and scale-up health professions education (HPE). At the same time, educational institutions are faced with increasing resource scarcity and decisions of where and how to allocate resources must be made conscious of costs. However, costs are known to be inaccurately and incompletely identified in HPE research. Therefore, to improve rigour in cost evidence and enable its use in decision-making, it is necessary to have a better understanding of the costs, stakeholders and cost identification methods being used in HPE research. This protocol has been developed to outline the rationale and methods for a scoping review of the literature intended to map the current state of cost and cost identification evidence in HPE. METHODS AND ANALYSIS: This protocol is developed in accordance with the Joanna Briggs Institute Manual for Evidence Synthesis. PubMed, ERIC, CINAHL and PsycInfo will be scoped for all types of English language publications from 2012 to 2022 that investigate costs associated with the education of health professionals. Two independent reviewers will assess publications for eligibility. Data will be extracted on the educational topic and context, the costs, cost types, perspectives and methods of cost identification as represented in the literature. ETHICS AND DISSEMINATION: No human participants are involved in this scoping review. All evidence for this study are sourced from public databases; therefore, ethical approval was not required. Final results will be disseminated through peer-reviewed publications and presented at conferences. TRIAL REGISTRATION NUMBER: A preliminary version of this protocol was prospectively registered on Open Science Framework (OSF) on 13 June 2022 and is available at https://doi.org/10.17605/OSF.IO/ET4XB.


Asunto(s)
Academias e Institutos , Estado de Conciencia , Humanos , Escolaridad , Bases de Datos Factuales , Empleos en Salud , Proyectos de Investigación , Literatura de Revisión como Asunto
17.
Am J Pharm Educ ; 87(3): ajpe9110, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-36270661

RESUMEN

Objectives. To explore the key factors that influence professional identity construction in fourth-year pharmacy students enrolled in a Doctor of Pharmacy program.Methods. A single-site instrumental case study of current fourth-year pharmacy students from the Leslie Dan Faculty of Pharmacy, University of Toronto, was used. Thirteen students participated in semistructured interviews. Poststructural social identity theories were used to analyze the data and identify themes that influence identity construction in pharmacy students.Results. Data analysis identified five overarching themes that influence pharmacy student professional identity construction: path to pharmacy, curriculum, environment, preceptors, and patient interactions. The Leslie Dan Faculty of Pharmacy curriculum prioritized the health care provider identity, which influenced the students desire to "become" clinicians. Based on their internalized health care provider identity, they rejected preceptors and practice environments that negatively impacted their ability to embody this identity.Conclusion. The findings of this study suggest that pharmacy students align themselves strongly with health care provider identities at the cost of other potentially relevant identities. Pharmacy education programs may benefit from curricular reforms that incorporate and legitimize multiple pharmacist identities to ensure a strong pharmacy workforce for the future.


Asunto(s)
Educación en Farmacia , Farmacia , Estudiantes de Farmacia , Humanos , Educación en Farmacia/métodos , Identificación Social , Curriculum
18.
Sci Rep ; 13(1): 9359, 2023 06 08.
Artículo en Inglés | MEDLINE | ID: mdl-37291189

RESUMEN

Liquid biopsy approaches offer a promising technology for early and minimally invasive cancer detection. Tumor-educated platelets (TEPs) have emerged as a promising liquid biopsy biosource for the detection of various cancer types. In this study, we processed and analyzed the TEPs collected from 466 Non-small Cell Lung Carcinoma (NSCLC) patients and 410 asymptomatic individuals (controls) using the previously established thromboSeq protocol. We developed a novel particle-swarm optimization machine learning algorithm which enabled the selection of an 881 RNA biomarker panel (AUC 0.88). Herein we propose and validate in an independent cohort of samples (n = 558) two approaches for blood samples testing: one with high sensitivity (95% NSCLC detected) and another with high specificity (94% controls detected). Our data explain how TEP-derived spliced RNAs may serve as a biomarker for minimally-invasive clinical blood tests, complement existing imaging tests, and assist the detection and management of lung cancer patients.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Neoplasias Pulmonares , Humanos , Carcinoma de Pulmón de Células no Pequeñas/genética , Neoplasias Pulmonares/genética , Biomarcadores de Tumor/genética , Algoritmos , ARN/metabolismo , Plaquetas/metabolismo , Pruebas Hematológicas
19.
Biochim Biophys Acta ; 1815(2): 189-96, 2011 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-21167916

RESUMEN

Coagulation abnormalities occur frequently in cancer patients. It is becoming evident that blood platelets have an important function in this process. However, understanding of the underlying mechanisms is still very modest. In this review, we discuss the role of platelets in tumor angiogenesis and growth and suggest their potential significance in malignancies. Platelets contain various pro-and antiangiogenic molecules, which seem to be endocytosed and sequestered in different populations of α-granules. Furthermore, tumor endothelial cells are phenotypically and functionally different from endothelial cells in healthy tissue, stimulating local platelet adhesion and subsequent activation. As a consequence, platelets are able to secrete their angiogenic and angiostatic content, most likely in a regulated manner. The overall effect of these platelet-endothelium interactions appears to be proangiogenic, stimulating tumor angiogenesis. We favor the view that local adhesion and activation of blood platelets and dysregulation of coagulation represent underestimated pathways in the progression of cancer.


Asunto(s)
Plaquetas/fisiología , Neoplasias/irrigación sanguínea , Neovascularización Patológica/metabolismo , Animales , Humanos
20.
J Immunol ; 184(6): 3164-73, 2010 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-20154208

RESUMEN

Vascular adhesion protein-1 (VAP-1) is an endothelial, cell surface-expressed oxidase involved in leukocyte traffic. The adhesive function of VAP-1 can be blocked by anti-VAP-1 Abs and small-molecule inhibitors. However, the effects of VAP-1 blockade on antitumor immunity and tumor progression are unknown. In this paper, we used anti-VAP-1 mAbs and small-molecule inhibitors of VAP-1 in B16 melanoma and EL-4 lymphoma tumor models in C57BL/6 mice. Leukocyte accumulation into tumors and neoangiogenesis were evaluated by immunohistochemistry, flow cytometry, and intravital videomicroscopy. We found that both anti-VAP-1 Abs and VAP-1 inhibitors reduced the number of leukocytes in the tumors, but they targeted partially different leukocyte subpopulations. Anti-VAP-1 Abs selectively inhibited infiltration of CD8-positive lymphocytes into tumors and had no effect on accumulation of myeloid cells into tumors. In contrast, the VAP-1 inhibitors significantly reduced only the number of proangiogenic Gr-1(+)CD11b(+) myeloid cells in melanomas and lymphomas. Blocking of VAP-1 by either means left tumor homing of regulatory T cells and type 2 immune-suppressing monocytes/macrophages intact. Notably, VAP-1 inhibitors, but not anti-VAP-1 Abs, retarded the growth of melanomas and lymphomas and reduced tumor neoangiogenesis. The VAP-1 inhibitors also reduced the binding of Gr-1(+) myeloid cells to the tumor vasculature. We conclude that tumors use the catalytic activity of VAP-1 to recruit myeloid cells into tumors and to support tumor progression. Small-molecule VAP-1 inhibitors therefore might be a potential new tool for immunotherapy of tumors.


Asunto(s)
Amina Oxidasa (conteniendo Cobre)/antagonistas & inhibidores , Amina Oxidasa (conteniendo Cobre)/inmunología , Moléculas de Adhesión Celular/antagonistas & inhibidores , Moléculas de Adhesión Celular/inmunología , Inhibición de Migración Celular/inmunología , Inhibidores de Crecimiento/uso terapéutico , Linfoma de Células T/inmunología , Melanoma Experimental/inmunología , Células Mieloides/inmunología , Células Mieloides/patología , Adyuvantes Inmunológicos/uso terapéutico , Alilamina/análogos & derivados , Alilamina/uso terapéutico , Amina Oxidasa (conteniendo Cobre)/biosíntesis , Animales , Anticuerpos Bloqueadores/uso terapéutico , Anticuerpos Monoclonales/uso terapéutico , Moléculas de Adhesión Celular/biosíntesis , Línea Celular Tumoral , Inhibición de Migración Celular/efectos de los fármacos , Inhibidores Enzimáticos/uso terapéutico , Femenino , Linfoma de Células T/patología , Linfoma de Células T/terapia , Melanoma Experimental/irrigación sanguínea , Melanoma Experimental/patología , Melanoma Experimental/terapia , Ratones , Ratones Endogámicos C57BL , Células Mieloides/efectos de los fármacos , Semicarbacidas/uso terapéutico
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