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1.
Lakartidningen ; 1202023 02 15.
Artigo em Sueco | MEDLINE | ID: mdl-36793217

RESUMO

To secure high-quality education for healthcare professionals, the teaching and learning processes-the "how" in education-should be informed by a research base. Although Swedish medical education research is growing, it lacks a national strategy. This study analysed and compared Swedish and Dutch production of medical education articles over ten years in nine core journals, including the number of editorial board members.  During the period 2012-2021, Swedish authors produced 217 articles, whereas Dutch authors published 1,441. The journals had 466 board members, of which 31 (7%) were Dutch and four (<1%) Swedish. The results show that medical education in Swedish medical faculties requires improvement. To ensure high-quality education opportunities, we propose a national effort to strengthen the educational research base, using the Dutch effort as inspiration.


Assuntos
Educação Médica , Humanos , Suécia , Escolaridade , Aprendizagem , Docentes de Medicina
2.
BMC Med Educ ; 22(1): 476, 2022 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-35725406

RESUMO

BACKGROUND: After completing university education, biomedical laboratory scientists work in clinical laboratories, in biomedical research laboratories, in biotech, and in pharmaceutical companies. Laboratory diagnostics have undergone rapid development over the recent years, with the pace showing no signs of abatement. This rapid development challenges the competence of the staff and will most certainly influence the education of future staff. This study aimed to examine what was considered the necessary competencies needed to pursue a career as a biomedical laboratory scientist. METHODS: A modified Delphi technique was used, with the panel of experts expressing their views in a series of three questionnaire. Consensus was defined as the point which 75 % or more of the panel participants agreed that a particular competency was necessary. RESULTS: The study highlights the perceived importance of mostly generic competencies that relate to quality, quality assurance, and accuracy, as well as different aspects of safety, respect, trustworthiness (towards patients/clients and colleagues), and communication skills. The results also stress the significance of self-awareness and professionality. CONCLUSIONS: We identified important competencies for biomedical laboratory scientists. Together with complementary information from other sources, i.e., guidelines, laws, and scientific publications, the competencies identified can be used as learning outcomes in a competency-based education to provide students with all the competencies needed to work as professional biomedical laboratory scientists.


Assuntos
Laboratórios , Pessoal de Laboratório , Competência Clínica , Consenso , Currículo , Técnica Delphi , Humanos , Inquéritos e Questionários
3.
Nurse Educ Pract ; 35: 48-54, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30665060

RESUMO

Clinical reasoning is proposed to represent cognitive processes, skills and decision-making aspects of nursing practice and is important for quality care. It has been suggested that the reasoning processes should be practiced during education to develop decision-making competence among nurses. The aim of the study was to explore and describe clinical reasoning processes at different times during specialist ambulance nurse education and among specialist ambulance nurses. Nurses were invited to participate: at initiation of specialist education (n = 19) and during the final weeks of specialist education (n = 17). We also invited nurses employed in ambulance service (n = 13). At each session a written case was presented for small group discussions. Discussions were recorded and transcribed. A mapping sentence was used to analyse the meaning units of the text capturing different elements of clinical reasoning. For interpretation of data the results were then plotted in a three-dimensional diagram. Professional experiences and reflectivity seemed to influence both the content and the process of clinical reasoning. At initiation of specialist education, more analytical reasoning was used, while the specialist nurses mainly used a non-analytical approach. Specialist nurses incorporated a larger variety of content during their reasoning. Based on the findings here, the case-method might be useful for practicing various clinical reasoning skills and elaborating on decision-making processes.


Assuntos
Ambulâncias , Competência Clínica , Serviços Médicos de Emergência , Estudantes de Enfermagem , Pensamento , Adulto , Tomada de Decisões , Educação em Enfermagem , Feminino , Humanos , Masculino
4.
BMC Med Educ ; 17(1): 158, 2017 Sep 11.
Artigo em Inglês | MEDLINE | ID: mdl-28893238

RESUMO

BACKGROUND: Outcome- or competency-based education is well established in medical and health sciences education. Curricula are based on courses where students develop their competences and assessment is also usually course-based. Clinical reasoning is an important competence, and the aim of this study was to monitor and describe students' progression in professional clinical reasoning skills during health sciences education using observations of group discussions following the case method. METHODS: In this qualitative study students from three different health education programmes were observed while discussing clinical cases in a modified Harvard case method session. A rubric with four dimensions - problem-solving process, disciplinary knowledge, character of discussion and communication - was used as an observational tool to identify clinical reasoning. A deductive content analysis was performed. RESULTS: The results revealed the students' transition over time from reasoning based strictly on theoretical knowledge to reasoning ability characterized by clinical considerations and experiences. Students who were approaching the end of their education immediately identified the most important problem and then focused on this in their discussion. Practice knowledge increased over time, which was seen as progression in the use of professional language, concepts, terms and the use of prior clinical experience. The character of the discussion evolved from theoretical considerations early in the education to clinical reasoning in later years. Communication within the groups was supportive and conducted with a professional tone. CONCLUSIONS: Our observations revealed progression in several aspects of students' clinical reasoning skills on a group level in their discussions of clinical cases. We suggest that the case method can be a useful tool in assessing quality in health sciences education.


Assuntos
Competência Clínica/normas , Educação Baseada em Competências , Educação de Pós-Graduação em Medicina , Educação de Graduação em Medicina , Resolução de Problemas , Treinamento por Simulação/normas , Estudantes de Medicina , Centros Médicos Acadêmicos , Boston , Currículo , Avaliação Educacional , Feminino , Humanos , Masculino , Pesquisa Qualitativa , Adulto Jovem
5.
Int Emerg Nurs ; 32: 20-27, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-27374021

RESUMO

BACKGROUND: The Swedish ambulance health care services are changing and developing, with the ambulance nurse playing a central role in the development of practice. The competence required by ambulance nurses in the profession remains undefined and provides a challenge. The need for a clear and updated description of ambulance nurses' competence, including the perspective of professional experiences, seems to be essential. AIM: The aim of this study was to elucidate ambulance nurses' professional experiences and to describe aspects affecting their competence. METHODS: For data collection, the study used the Critical Incident Technique, interviewing 32 ambulance nurses. A qualitative content analysis was applied. RESULTS AND CONCLUSION: This study elucidates essential parts of the development, usage and perceptions of the competence of ambulance nurses and how, in various ways, this is affected by professional experiences. The development of competence is strongly affected by the ability and possibility to reflect on practice on a professional and personal level, particularly in cooperation with colleagues. Experiences and communication skills are regarded as decisive in challenging clinical situations. The way ambulance nurses perceive their own competence is closely linked to patient outcome. The results of this study can be used in professional and curriculum development.


Assuntos
Competência Clínica/normas , Comportamento Cooperativo , Serviços Médicos de Emergência/métodos , Relações Interprofissionais , Enfermeiras e Enfermeiros/normas , Ambulâncias , Humanos , Equipe de Enfermagem/métodos , Equipe de Enfermagem/normas , Inovação Organizacional , Pesquisa Qualitativa , Suécia , Análise e Desempenho de Tarefas , Recursos Humanos
6.
Basic Clin Pharmacol Toxicol ; 117(6): 413-20, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-26123372

RESUMO

A new curriculum is planned for the medical school at Lund University, Sweden. Pharmacology, in a broad sense, has been identified as a subject that needs to be strengthened based on needs in the healthcare system. The aim was to identify the competencies in basic and clinical pharmacology that a newly qualified physician needs. Using a modified three-round Delphi technique, 31 physicians were invited to list necessary competencies (round 1). After content analysis, these panel members classified the list by importance on two occasions (rounds 2 and 3) using a 4-point scale (4 = necessary, 3 = desirable, 2 = useful, 1 = not necessary). Competencies with the highest ranks based on necessity were retained. Thirty physicians accepted the invitation and 25 (83%) of them completed all three rounds. Round 1 resulted in 258 suggestions, which were subsequently reduced to 95 competencies. Of these 95 competencies, 40 were considered necessary by at least 75% of the panel members. The degree of consensus increased between round 2 and round 3. Using a modified Delphi technique, we identified 40 competencies that could be transferred to learning outcomes for a new curriculum in basic and clinical pharmacology at medical school.


Assuntos
Competência Clínica , Técnica Delphi , Educação de Graduação em Medicina/métodos , Farmacologia Clínica/educação , Ensino/métodos , Consenso , Currículo , Humanos , Desenvolvimento de Programas , Faculdades de Medicina , Inquéritos e Questionários , Suécia
7.
Adv Health Sci Educ Theory Pract ; 20(2): 531-57, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25160816

RESUMO

The role of workplace supervisors in the clinical education of medical students is currently under debate. However, few studies have addressed how supervisors conceptualize workplace learning and how conceptions relate to current sociocultural workplace learning theory. We explored physician conceptions of: (a) medical student learning in the clinical workplace and (b) how they contribute to student learning. The methodology included a combination of a qualitative, inductive (conventional) and deductive (directed) content analysis approach. The study triangulated two types of interview data from 4 focus group interviews and 34 individual interviews. A total of 55 physicians participated. Three overarching themes emerged from the data: learning as membership, learning as partnership and learning as ownership. The themes described how physician conceptions of learning and supervision were guided by the notions of learning-as-participation and learning-as-acquisition. The clinical workplace was either conceptualized as a context in which student learning is based on a learning curriculum, continuity of participation and partnerships with supervisors, or as a temporary source of knowledge within a teaching curriculum. The process of learning was shaped through the reciprocity between different factors in the workplace context and the agency of students and supervising physicians. A systems-thinking approach merged with the "co-participation" conceptual framework advocated by Billet proved to be useful for analyzing variations in conceptions. The findings suggest that mapping workplace supervisor conceptions of learning can be a valuable starting point for medical schools and educational developers working with changes in clinical educational and faculty development practices.


Assuntos
Docentes de Medicina/psicologia , Aprendizagem , Cultura Organizacional , Estudantes de Medicina/psicologia , Ensino , Local de Trabalho/psicologia , Adulto , Currículo , Educação de Pós-Graduação em Medicina , Feminino , Grupos Focais , Humanos , Masculino , Pessoa de Meia-Idade , Pesquisa Qualitativa
8.
Int Emerg Nurs ; 22(3): 127-33, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24210954

RESUMO

Nursing is evolving into new fields of health care including ambulance care, where a branch of specialist nursing is growing. Various views exist on the desired competence for the ambulance nurse and valid guidelines are lacking in Sweden. To increase knowledge of the field, professionals were asked to describe what competences an ambulance nurse should possess. The aim of this study was therefore to elucidate the desired professional competence of the specialist ambulance nurse, according to the professionals. A modified Delphi technique was used, where a panel of professional experts expressed their views on the desired competence of the ambulance nurse. This study reports, at a high level of agreement among the panel experts, that the desired competence of the specialist ambulance nurse consist of forty-four separate competences creating ten areas of competences: execute leadership, generic abilities, interpersonal communication, institutional collaboration, pedagogic skills, possession of relevant knowledge, professional judgement, professional skills, research activities, and technical skills. The high level of agreement among the professionals as well as the large number of competences reflects the high demands placed on the ambulance nurse by the professionals themselves.


Assuntos
Ambulâncias , Serviços Médicos de Emergência/normas , Recursos Humanos de Enfermagem/normas , Competência Profissional/normas , Técnica Delphi , Serviços Médicos de Emergência/métodos , Humanos , Inquéritos e Questionários , Suécia
9.
Med Teach ; 35(12): 1014-26, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24050817

RESUMO

BACKGROUND: There is a paucity of instruments designed to evaluate the multiple dimensions of the workplace as an educational environment for undergraduate medical students. AIM: The aim was to develop and psychometrically evaluate an instrument to measure how undergraduate medical students perceive the clinical workplace environment, based on workplace learning theories and empirical findings. METHOD: Development of the instrument relied on established standards including theoretical and empirical grounding, systematic item development and expert review at various stages to ensure content validity. Qualitative and quantitative methods were employed using a series of steps from conceptualization through psychometric analysis of scores in a Swedish medical student population. RESULTS: The final result was a 25-item instrument with two overarching dimensions, experiential learning and social participation, and four subscales that coincided well with theory and empirical findings: Opportunities to learn in and through work & quality of supervision; Preparedness for student entry; Workplace interaction patterns & student inclusion; and Equal treatment. Evidence from various sources supported content validity, construct validity and reliability of the instrument. CONCLUSION: The Undergraduate Clinical Education Environment Measure represents a valid, reliable and feasible multidimensional instrument for evaluation of the clinical workplace as a learning environment for undergraduate medical students. Further validation in different populations using various psychometric methods is needed.


Assuntos
Atitude do Pessoal de Saúde , Meio Ambiente , Psicometria , Estudantes de Medicina/psicologia , Inquéritos e Questionários , Local de Trabalho , Adulto , Educação de Graduação em Medicina , Feminino , Humanos , Masculino , Suécia
10.
Med Teach ; 34(5): 361-7, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22452277

RESUMO

BACKGROUND: One of the key elements for introducing a problem-based learning (PBL) programme is constructing good PBL cases. Good cases should reflect the educational principles of PBL including (a) integration of basic and clinical sciences together with professionalism and psychosocial components, (b) encouragement of discussion of cognitive domains such as identification of problems, generation of hypotheses, construction of an enquiry plan, weighing evidence for and against each hypothesis, interpretation of findings, construction of mechanisms, using evidence to refine the hypothesis and construction of a management plan, (c) encouragement of discussion of cases in small groups with an emphasis on student-centred learning, (d) promotion of collaborative learning and contribution of students to the case discussion and (e) encouragement of teamwork and self-directed learning strategies. AIMS AND METHODS: Despite the importance of construction of good PBL cases to the success of a PBL programme, the art of construction of these cases is understudied or described in the literature. Based on our experience in PBL and evidence from literature, we described 12 tips for constructing good PBL cases. RESULTS AND CONCLUSIONS: Constructing good PBL cases is an art that necessitates teamwork and input from several different disciplines. Cases should be constructed using a template reflecting the educational objectives of the programme. This approach will ensure optimum learning outcomes and consistency in the design and delivery of cases.


Assuntos
Educação Médica/métodos , Aprendizagem Baseada em Problemas/métodos , Aprendizagem Baseada em Problemas/organização & administração , Comunicação , Processos Grupais , Humanos , Aprendizagem , Objetivos Organizacionais , Equipe de Assistência ao Paciente/organização & administração , Arábia Saudita , Estudantes de Medicina/psicologia
11.
Med Teach ; 33(7): e349-57, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21696267

RESUMO

BACKGROUND: There is a paucity of research on the effects of interactive feedback methods and sustained assessment strategies in formative assessment of students in the workplace. AIMS: To investigate the outcome of long-term use of an assessment tool. METHODS: Retrospective analysis of summarised assessment tools from 3 years of 464 final-year students in general practice. Quantitative data were analysed using non-parametric tests and a multi-level approach. Qualitative data were subjected to content analysis. RESULTS: Students' main deficiencies in the consultation were in the domains of working diagnoses and management plans; however, supervisors emphasised goals of patient-centred communication and structure of the medical interview. As a group, students underestimated their clinical performance, compared to supervisors' judgement. Most students were supplied with specific goals, 58% with specific follow-up feedback. The majority of students and supervisors were satisfied with the assessment strategy. Long-term experience with the tool significantly increased the proportion of specific goals and feedback to students, supervisors' stringency of the assessment, and their satisfaction with the tool. CONCLUSIONS: The summarised assessment strategy proved feasible and acceptable with students and supervisors in a continuous attachment with assigned personal supervisors. However, there was room for improvement in supervisors' provision of specific follow-up feedback.


Assuntos
Educação de Graduação em Medicina , Retroalimentação , Avaliação de Programas e Projetos de Saúde/métodos , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Estudantes de Medicina/psicologia , Adulto Jovem
12.
Med Teach ; 33(5): e267-74, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21517678

RESUMO

BACKGROUND: The Dundee Ready Educational Environment Measure (DREEM) has been used in various studies to evaluate the educational environment. However, psychometric evaluations of the instrument seem sparse, for all known versions of the instrument. AIM: The aim was to psychometrically evaluate the Swedish version of the DREEM instrument. METHOD: A total of 503 students (undergraduate medicine), aged 19-46 years, in semesters 2, 6 and 10 were included in the study. Validity was evaluated through analysis of construct validity and reliability. RESULTS: The instrument had in general both acceptable validity and reliability. Due to a rather poor model fit in the confirmatory factor analysis, an explorative factor analysis was also employed which suggested a new five-factor solution for the instrument. CONCLUSIONS: The Swedish version of the DREEM instrument is shown to be valid and reliable, except for the factor structure. The new five-factor solution found in this study is not proven to be a superior measurement model compared with the original, but could be seen as an alternative model to the original, where the strong and weak areas are somewhat more easily identified.


Assuntos
Educação de Graduação em Medicina , Psicometria/métodos , Estudantes de Medicina/psicologia , Inquéritos e Questionários , Adulto , Estudos de Coortes , Comunicação , Feminino , Humanos , Aprendizagem , Masculino , Pessoa de Meia-Idade , Reprodutibilidade dos Testes , Suécia , Ensino , Adulto Jovem
13.
Med Teach ; 32(12): e532-40, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-21090940

RESUMO

BACKGROUND: Portfolios are highlighted as potential assessment tools for professional competence. Although students' self-reflections are considered to be central in the portfolio, the content of reflections in practice-based portfolios is seldom analysed. AIM: To investigate whether students' reflections include sufficient dimensions of professional competence, notwithstanding a standardized portfolio format, and to evaluate students' satisfaction with the portfolio. METHODS: Thirty-five voluntary final-year medical students piloted a standardized portfolio in a general practice (GP) attachment at Lund University, Sweden. Students' portfolio reflections were based upon documentary evidence from practice, and aimed to demonstrate students' learning. The reflections were qualitatively analysed, using a framework approach. Students' evaluations of the portfolio were subjected to quantitative and qualitative analysis. RESULTS: Among professional issues, an integration of cognitive, affective and practical dimensions in clinical practice was provided by students' reflections. The findings suggested an emphasis on affective issues, particularly on self-awareness of feelings, attitudes and concerns. In addition, ethical problems, clinical reasoning strategies and future communication skills training were subjects of several reflective commentaries. Students' reflections on their consultation skills demonstrated their endeavour to achieve structure in the medical interview by negotiation of an agenda for the consultation, keeping the interview on track, and using internal summarizing. The importance of active listening and exploration of patient's perspective was also emphasized. In students' case summaries, illustrating characteristic attributes of GP, the dominating theme was 'patient-centred care', including the patient-doctor relationship, holistic modelling and longitudinal continuity. Students were satisfied with the portfolio, but improved instructions were needed. CONCLUSIONS: A standardized portfolio in a defined course with a limited timeframe provided ample opportunities for reflections on professional issues. Support by mentors and a final examiner interview contributed to the success of the portfolio with students. The interview also allowed students to deepen their reflections and to receive feedback.


Assuntos
Competência Profissional , Estudantes de Medicina/psicologia , Educação de Graduação em Medicina , Feminino , Medicina Geral/educação , Humanos , Masculino , Projetos Piloto , Avaliação de Programas e Projetos de Saúde , Suécia
14.
Med Teach ; 32(6): e233-8, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20515368

RESUMO

BACKGROUND: The medical programme at Lund University, Sweden, has undergone curricular reform over several stages, which is still ongoing. Students have been somewhat negative in their evaluations of the education during this time. AIM: To find out how the students perceived the educational climate using the Dundee Ready Education Environment Measure (DREEM), and to compare the findings taken at two given points in time. METHOD: The DREEM instrument was distributed in semesters 2, 6 and 10 in 2003 and 2005, to a total of 503 students. RESULTS: The students rated their climate as positive. The total DREEM score (145) was somewhat higher than other published results and in the same range as for other reformed curricula. There was hardly any difference between the genders in their perceptions of the climate. Certain items were rated low and became subject of development between the measurements. These items concerned a perceived lack of a support system for stressed students and a lack of feedback and constructive criticism from teachers. Some improvement was detected in 2005. CONCLUSION: The educational climate was high in a reformed curriculum and could be maintained high during on-going curricular reform. Educational development resulted in better results on some items.


Assuntos
Currículo , Educação Médica , Estudantes de Medicina/psicologia , Adulto , Feminino , Humanos , Masculino , Inovação Organizacional , Faculdades de Medicina/organização & administração , Inquéritos e Questionários , Suécia , Adulto Jovem
15.
Med Teach ; 28(6): e171-6, 2006 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17074697

RESUMO

A portfolio assessment system has been introduced into a biomedical science programme to promote both continuous learning and deep approaches to learning. Attention has been focused on creating harmony between the assessment system and the PBL curriculum of the programme. Biomedicine and laboratory work are central in the curriculum. The portfolio included evidence of laboratory work, personal reflections and certificates from the PBL tutor. The portfolio was assessed on three occasions over 20 weeks. The grades were 'pass' or 'fail'. The tutor certificate appeared to be a crucial part of the portfolio since a 'fail' in this part usually led to an overall 'fail'. Both students and teachers were concerned about ensuring that enough factual knowledge, as measured by a traditional test, had been achieved. The agreement was good enough for the pass or fail level but some expected differences were found at the detailed level. The course, including the portfolio, was evaluated orally during weekly whole-group meetings and using a questionnaire at the end. The students felt comfortable with the portfolio system and preferred it to a traditional test. The teachers felt that they needed to develop their teacher-student discussion skills and to improve their feedback on the reflections. Peer assessment between students is proposed as a line of action to enhance the credibility of the crucial tutor certificate. The portfolio might be an efficient tool for the students to concentrate their efforts on the most central concepts of medical laboratory work. The model will be developed through further discussions and better consensus among faculty.


Assuntos
Documentação/métodos , Documentação/normas , Avaliação Educacional/métodos , Educação em Saúde , Aprendizagem Baseada em Problemas , Adulto , Humanos , Laboratórios , Grupo Associado , Inquéritos e Questionários
16.
Med Teach ; 28(5): 409-17, 2006 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-16973452

RESUMO

In this study the Delphi technique has been used to develop a core curriculum for education of the biomedical scientist. The rapid development in biomedicine and the corresponding changes in methodology in biomedical laboratories demand careful planning of the education of biomedical scientists. The Delphi technique uses an anonymous panel of experts for suggestions and assessments aiming at consensus. Twenty-six experts from different kinds of hospital and university laboratories took part in the investigation. They suggested and assessed necessary competences for a recently graduated biomedical scientist, and if 75% or more of the participants agreed on a competence, it was included in the core curriculum. The final list consisted of 66 competences of varying depth, in three categories. This list contained several generic competences, concerning for example basic laboratory methods, handling of samples, dealing with apparatus and applying relevant rules and laws; basic knowledge in chemistry, preclinical medicine and laboratory methods; and finally attitudes that the panel expected in the recently graduated person. The core was sufficiently restricted to be used in a three-year programme and still leave space for about one year of electives/special study modules. It became rather traditional, e.g. it did not include competences that many recent reports consider important for the future professional.


Assuntos
Pesquisa Biomédica/educação , Currículo , Técnica Delphi , Pessoal de Laboratório Médico/educação , Competência Profissional , Humanos
17.
Endocrinology ; 146(2): 744-50, 2005 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-15514088

RESUMO

The neuropeptides pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal polypeptide (VIP) are structurally and functionally related. Their actions have been shown to be mediated by three different receptor subtypes: PAC1-R, which has exclusive affinity for PACAP, and VPAC1-R and VPAC2-R, which have equal affinity for PACAP and VIP. We recently showed that PACAP38 induces lipolysis in rat adipocytes, and in the present study we examined whether VIP has similar effects and which of the three receptors mediates this PACAP/VIP action. We showed by RT-PCR that all three receptor subtypes are present in rat adipocytes. We demonstrated that VIP (1-100 nm), like PACAP38, stimulates lipolysis in isolated adipocytes, as determined by glycerol release. By a pharmacological approach, using antagonists and agonists specific for the receptor subtypes, we elucidated the mechanisms by which PACAP38 and VIP mediate their lipolytic effects. We found that antagonists of PAC1-R [PACAP(6-38)] and VPAC1-R (PG97-269) did not affect lipolysis induced by 0.1-100 nm PACAP38 or VIP, and that a VPAC1-R agonist [K15, R16, L27VIP(1-7)GRF(8-27)] did not affect lipolysis at 1-1000 nm. However, two different VPAC2-R agonists [Hexa-VIP(1-28) and Ro25-1553] clearly mimicked the lipolytic effect of PACAP38 and VIP. In addition, the VPAC2-R antagonist PG99-465 (100 nm) caused right-shifted dose-response curves of PACAP38- and VIP-induced lipolysis. These results therefore provide evidence that all three PACAP/VIP receptor subtypes are expressed in primary rat adipocytes, but that the VPAC2-R subtype is responsible for mediating the lipolytic effects induced by PACAP38 and VIP.


Assuntos
Adipócitos/metabolismo , Fatores de Crescimento Neural/farmacologia , Neuropeptídeos/farmacologia , Neurotransmissores/farmacologia , Receptores de Peptídeo Intestinal Vasoativo/genética , Receptores de Peptídeo Intestinal Vasoativo/metabolismo , Peptídeo Intestinal Vasoativo/farmacologia , Adipócitos/efeitos dos fármacos , Animais , Proteína Quinase Tipo II Dependente de AMP Cíclico , Proteínas Quinases Dependentes de AMP Cíclico/metabolismo , Expressão Gênica , Lipólise/efeitos dos fármacos , Lipólise/fisiologia , Masculino , Fatores de Crescimento Neural/metabolismo , Neuropeptídeos/metabolismo , Neurotransmissores/metabolismo , Fragmentos de Peptídeos/farmacologia , Polipeptídeo Hipofisário Ativador de Adenilato Ciclase , Ratos , Ratos Sprague-Dawley , Receptores de Superfície Celular/antagonistas & inibidores , Receptores de Superfície Celular/genética , Receptores de Polipeptídeo Hipofisário Ativador de Adenilato Ciclase , Receptores de Polipeptídeo Hipofisário Ativador de Adenilato Ciclase , Receptores de Peptídeo Intestinal Vasoativo/agonistas , Receptores de Peptídeo Intestinal Vasoativo/antagonistas & inibidores , Receptores Tipo II de Peptídeo Intestinal Vasoativo , Receptores Tipo I de Polipeptídeo Intestinal Vasoativo , Peptídeo Intestinal Vasoativo/metabolismo
18.
Endocrinology ; 144(12): 5293-9, 2003 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-12960103

RESUMO

Pituitary adenylate cyclase-activating peptide (PACAP) is a neuropeptide that exerts its effects throughout the body by elevating the intracellular amounts of cAMP. In adipocytes, an increased amount of cAMP is associated with increased lipolysis. In this work we evaluated the effects of PACAP38 on triglyceride metabolism in primary rat adipocytes. Stimulation of adipocytes with PACAP (0.1-100 nm) resulted in stimulation of lipolysis to the same extent as isoproterenol. Lipolysis was blocked by 25 microm of the protein kinase A inhibitor H-89 and potentiated in the presence of 10 microm OPC3911, a phosphodiesterase 3 inhibitor. In addition, PACAP38 induced activation of protein kinase A. Insulin efficiently inhibited PACAP38-induced lipolysis in a phosphatidyl inositol 3-kinase and phosphodiesterase 3-dependent manner. Interestingly, we also found that PACAP38, as well as isoproterenol, induced potentiation of lipogenesis in the presence of insulin. These results show that PACAP38 and isoproterenol mediate catabolic as well as anabolic effects in adipocytes, depending on the concentration of insulin present. We speculate that in the early postprandial state and during fasting, when insulin levels are low, PACAP and beta-adrenergic catecholamines induce lipolysis, whereas when higher levels of insulin are present, these agents potentiate the anabolic effect of insulin, i.e. storage of triglycerides.


Assuntos
Adipócitos/efeitos dos fármacos , Adipócitos/metabolismo , Isoproterenol/farmacologia , Neuropeptídeos/farmacologia , Sulfonamidas , Simpatomiméticos/farmacologia , Triglicerídeos/metabolismo , Animais , AMP Cíclico/metabolismo , Proteínas Quinases Dependentes de AMP Cíclico/antagonistas & inibidores , Proteínas Quinases Dependentes de AMP Cíclico/metabolismo , Sinergismo Farmacológico , Inibidores Enzimáticos/farmacologia , Hipoglicemiantes/farmacologia , Insulina/farmacologia , Isoquinolinas/farmacologia , Lipólise/efeitos dos fármacos , Masculino , Polipeptídeo Hipofisário Ativador de Adenilato Ciclase , Ratos , Ratos Sprague-Dawley , Triglicerídeos/biossíntese
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