Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 38
Filtrar
Mais filtros

Base de dados
Tipo de documento
Intervalo de ano de publicação
1.
Brain Behav Immun ; 101: 214-230, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-35026421

RESUMO

Inflammatory and neuropathic-like components underlie rheumatoid arthritis (RA)-associated pain, and lysophosphatidic acid (LPA) is linked to both joint inflammation in RA patients and to neuropathic pain. Thus, we investigated a role for LPA signalling using the collagen antibody-induced arthritis (CAIA) model. Pain-like behavior during the inflammatory phase and the late, neuropathic-like phase of CAIA was reversed by a neutralizing antibody generated against LPA and by an LPA1/3 receptor inhibitor, but joint inflammation was not affected. Autotaxin, an LPA synthesizing enzyme was upregulated in dorsal root ganglia (DRG) neurons during both CAIA phases, but not in joints or spinal cord. Late-phase pronociceptive neurochemical changes in the DRG were blocked in Lpar1 receptor deficient mice and reversed by LPA neutralization. In vitro and in vivo studies indicated that LPA regulates pain-like behavior via the LPA1 receptor on satellite glia cells (SGCs), which is expressed by both human and mouse SGCs in the DRG. Furthermore, CAIA-induced SGC activity is reversed by phospholipid neutralization and blocked in Lpar1 deficient mice. Our findings suggest that the regulation of CAIA-induced pain-like behavior by LPA signalling is a peripheral event, associated with the DRGs and involving increased pronociceptive activity of SGCs, which in turn act on sensory neurons.


Assuntos
Artrite Experimental , Neuralgia , Animais , Anticorpos , Colágeno , Gânglios Espinais , Humanos , Lisofosfolipídeos , Camundongos , Neuroglia , Células Receptoras Sensoriais
2.
Food Policy ; 111: 102306, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35783573

RESUMO

We document trends in food security up to one full year after the onset of the COVID-19 pandemic in four African countries. Using household-level data collected by the World Bank, we highlight differences over time amid the pandemic, between rural and urban areas, and between female-headed and male-headed households within Burkina Faso, Ethiopia, Malawi, and Nigeria. We first observe a sharp increase in food insecurity during the early months of the pandemic with a subsequent gradual decline. Next, we find that food insecurity has increased more in rural areas than in urban areas relative to pre-pandemic data within each of these countries. Finally, we do not find a systematic difference in changes in food insecurity between female-headed and male-headed households. These trends complement previous microeconomic analysis studying short-term changes in food security associated with the pandemic and existing macroeconomic projections.

3.
J Interprof Care ; 33(6): 628-635, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30871380

RESUMO

This paper reports a qualitative study that explored the meanings of interprofessional education (IPE) by comparing and contrasting educational leaders' perceptions with educational policy documents at an academic health professions education institution in Scandinavia. The study used Goffman's frame analysis to identify two frames of IPE by illuminating issues related to the definition, rationale, and presentation of IPE. A directed content analysis to identify these three aspects of IPE was conducted on semi-structured interviews with nine educational leaders who were overseeing the development of IPE, as well as on the institution's regulatory IPE documentation. Differences regarding definition, rationale, and presentation of IPE between the institutional regulatory IPE frame and the IPE frame of the educational leaders were found which implied difficulties for the educational leaders regarding the implementation of IPE. Based on the study's findings, the paper argues that creating awareness of the differences in meanings of IPE between different perspectives within an academic education institution is an important factor to consider when creating future organisational structures and faculty development programmes in connection to IPE.


Assuntos
Ocupações em Saúde/educação , Relações Interprofissionais , Adulto , Currículo , Feminino , Humanos , Masculino , Modelos Educacionais , Pesquisa Qualitativa , Países Escandinavos e Nórdicos
4.
Cereb Cortex ; 26(4): 1804-17, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26838771

RESUMO

Nogo receptor 1 (NgR1) is expressed in forebrain neurons and mediates nerve growth inhibition in response to Nogo and other ligands. Neuronal activity downregulates NgR1 and the inability to downregulate NgR1 impairs long-term memory. We investigated behavior in a serial behavioral paradigm in mice that overexpress or lack NgR1, finding impaired locomotor behavior and recognition memory in mice lacking NgR1 and impaired sequential spatial learning in NgR1 overexpressing mice. We also investigated a role for NgR1 in drug-mediated sensitization and found that repeated cocaine exposure caused stronger locomotor responses but limited development of stereotypies in NgR1 overexpressing mice. This suggests that NgR1-regulated synaptic plasticity is needed to develop stereotypies. Ex vivo magnetic resonance imaging and diffusion tensor imaging analyses of NgR1 overexpressing brains did not reveal any major alterations. NgR1 overexpression resulted in significantly reduced density of mature spines and dendritic complexity. NgR1 overexpression also altered cocaine-induced effects on spine plasticity. Our results show that NgR1 is a negative regulator of both structural synaptic plasticity and dendritic complexity in a brain region-specific manner, and highlight anterior cingulate cortex as a key area for memory-related plasticity.


Assuntos
Encéfalo/metabolismo , Dendritos/fisiologia , Locomoção , Plasticidade Neuronal , Receptor Nogo 1/metabolismo , Reconhecimento Psicológico/fisiologia , Aprendizagem Espacial/fisiologia , Animais , Encéfalo/efeitos dos fármacos , Cocaína/administração & dosagem , Dendritos/efeitos dos fármacos , Imagem de Tensor de Difusão , Feminino , Giro do Cíngulo/efeitos dos fármacos , Giro do Cíngulo/metabolismo , Locomoção/efeitos dos fármacos , Imageamento por Ressonância Magnética , Masculino , Camundongos , Camundongos Knockout , Plasticidade Neuronal/efeitos dos fármacos , Receptor Nogo 1/genética , Teste de Desempenho do Rota-Rod
5.
BMC Med Educ ; 17(1): 29, 2017 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-28143476

RESUMO

BACKGROUND: The mission of undergraduate medical education leaders is to strive towards the enhancement of quality of medical education and health care. The aim of this qualitative study is, with the help of critical perspectives, to contribute to the research area of undergraduate medical education leaders and their identity formation; how can the identity of undergraduate medical education leaders be defined and further explored from a power perspective? METHODS: In this explorative study, 14 educational leaders at a medical programme in Scandinavia were interviewed through semi-structured interviews. The data was analysed through Moustakas' structured, phenomenological analysis approach and then pattern matched with Gee's power-based identity model. RESULTS: Educational leaders identify themselves more as mediators than leaders and do not feel to any larger extent that their professional identity is authorised by the university. These factors potentially create difficulties when trying to communicate with medical teachers, often also with a weaker sense of professional identity, about medical education. CONCLUSIONS: The perceptions of the professional identity of undergraduate medical education leaders provide us with important notions on the complexities on executing their important mission to develop medical education: their perceptions of ambiguity towards the process of trying to lead teachers toward educational development and a perceived lack of authorisation of their work from the university level. These are important flaws to observe and correct when improving the context in which undergraduate medical education leaders are trying to develop and improve undergraduate medical programmes. A practical outcome of the results of this study is the facilitation of design of faculty development programmes for educational leaders in undergraduate medial education.


Assuntos
Competência Clínica/normas , Educação de Graduação em Medicina/métodos , Docentes de Medicina/normas , Liderança , Educação de Graduação em Medicina/normas , Humanos , Pesquisa Qualitativa , Identificação Social
6.
Glia ; 64(7): 1190-209, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-27100937

RESUMO

Axonal pathology is a key contributor to long-term disability in multiple sclerosis (MS), an inflammatory demyelinating disease of the central nervous system (CNS), but the mechanisms that underlie axonal pathology in MS remain elusive. Evidence suggests that axonal pathology is a direct consequence of demyelination, as we and others have shown that the node of Ranvier disassembles following loss of myelin. In contrast to the node of Ranvier, we now show that the axon initial segment (AIS), the axonal domain responsible for action potential initiation, remains intact following cuprizone-induced cortical demyelination. Instead, we find that the AIS is disrupted in the neocortex of mice that develop experimental autoimmune encephalomyelitis (EAE) independent of local demyelination. EAE-induced mice demonstrate profound compromise of AIS integrity with a progressive disruption that corresponds to EAE clinical disease severity and duration, in addition to cortical microglial reactivity. Furthermore, treatment with the drug didox results in attenuation of AIS pathology concomitantly with microglial reversion to a less reactive state. Together, our findings suggest that inflammation, but not demyelination, disrupts AIS integrity and that therapeutic intervention may protect and reverse this pathology. GLIA 2016;64:1190-1209.


Assuntos
Segmento Inicial do Axônio/fisiologia , Axônios/patologia , Encefalomielite Autoimune Experimental/patologia , Regulação da Expressão Gênica/fisiologia , Microglia/metabolismo , Animais , Animais Geneticamente Modificados , Doenças Autoimunes do Sistema Nervoso/induzido quimicamente , Doenças Autoimunes do Sistema Nervoso/tratamento farmacológico , Doenças Autoimunes do Sistema Nervoso/patologia , Antígeno CD11b/genética , Antígeno CD11b/metabolismo , Morte Celular/fisiologia , Células Cultivadas , Cuprizona/toxicidade , Modelos Animais de Doenças , Encefalomielite Autoimune Experimental/induzido quimicamente , Encefalomielite Autoimune Experimental/tratamento farmacológico , Encefalomielite Autoimune Experimental/imunologia , Regulação da Expressão Gênica/efeitos dos fármacos , Ácidos Hidroxâmicos/uso terapêutico , Fator Estimulador de Colônias de Macrófagos/genética , Fator Estimulador de Colônias de Macrófagos/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Microglia/efeitos dos fármacos , Inibidores da Monoaminoxidase/toxicidade , Óxido Nítrico Sintase Tipo II/genética , Óxido Nítrico Sintase Tipo II/metabolismo , Antígenos Thy-1/genética , Antígenos Thy-1/metabolismo , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/metabolismo
7.
Mol Pain ; 10: 12, 2014 Feb 13.
Artigo em Inglês | MEDLINE | ID: mdl-24521084

RESUMO

BACKGROUND: Somatostatin (SST) and some of its receptor subtypes have been implicated in pain signaling at the spinal level. In this study we have investigated the role of SST and its sst2A receptor (sst2A) in dorsal root ganglia (DRGs) and spinal cord. RESULTS: SST and sst2A protein and sst2 transcript were found in both mouse and human DRGs, sst2A-immunoreactive (IR) cell bodies and processes in lamina II in mouse and human spinal dorsal horn, and sst2A-IR nerve terminals in mouse skin. The receptor protein was associated with the cell membrane. Following peripheral nerve injury sst2A-like immunoreactivity (LI) was decreased, and SST-LI increased in DRGs. sst2A-LI accumulated on the proximal and, more strongly, on the distal side of a sciatic nerve ligation. Fluorescence-labeled SST administered to a hind paw was internalized and retrogradely transported, indicating that a SST-sst2A complex may represent a retrograde signal. Internalization of sst2A was seen in DRG neurons after systemic treatment with the sst2 agonist octreotide (Oct), and in dorsal horn and DRG neurons after intrathecal administration. Some DRG neurons co-expressed sst2A and the neuropeptide Y Y1 receptor on the cell membrane, and systemic Oct caused co-internalization, hypothetically a sign of receptor heterodimerization. Oct treatment attenuated the reduction of pain threshold in a neuropathic pain model, in parallel suppressing the activation of p38 MAPK in the DRGs CONCLUSIONS: The findings highlight a significant and complex role of the SST system in pain signaling. The fact that the sst2A system is found also in human DRGs and spinal cord, suggests that sst2A may represent a potential pharmacologic target for treatment of neuropathic pain.


Assuntos
Gânglios Espinais/patologia , Receptores de Somatostatina/metabolismo , Ciática/metabolismo , Ciática/patologia , Células Receptoras Sensoriais/metabolismo , Somatostatina/metabolismo , Animais , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Feminino , Lateralidade Funcional/genética , Regulação da Expressão Gênica/efeitos dos fármacos , Regulação da Expressão Gênica/genética , Glutamato Descarboxilase/genética , Proteínas de Fluorescência Verde/deficiência , Proteínas de Fluorescência Verde/genética , Humanos , Hiperalgesia/tratamento farmacológico , Hiperalgesia/etiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Pessoa de Meia-Idade , Octreotida/uso terapêutico , Oligopeptídeos/farmacologia , Limiar da Dor/efeitos dos fármacos , Limiar da Dor/fisiologia , Transporte Proteico/efeitos dos fármacos , Transporte Proteico/genética , Receptores de Somatostatina/antagonistas & inibidores , Receptores de Somatostatina/deficiência , Receptores de Somatostatina/genética , Ciática/complicações , Ciática/tratamento farmacológico , Células Receptoras Sensoriais/efeitos dos fármacos , Somatostatina/genética
8.
Adv Health Sci Educ Theory Pract ; 19(5): 709-20, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24604665

RESUMO

Today, the knowledge concerning clinical reasoning is advanced enough to translate into curriculum interventions such as an integrated curriculum, in which science theory and clinical practice can be interwoven effectively. However, the interpretations of what integration means differ and the purpose of this study was to elicit how students understand integration. This study was carried out using an interpretative perspective. Medical students, in their 2nd year of study, were asked to apply basic science knowledge from all previous courses to clinical cases in an examination. Subsequent to the examination, focus group interviews were conducted. The interviews were audio recorded, transcribed and analysed by the use of qualitative content analysis. The analysis revealed how students comprehended integration: as the creation of wholeness, as relating new knowledge to core concepts, as reasoning, as application and as collaboration between teachers. The five categories were linked to three dimensions: intra-personal, inter-personal and organizational, each of which resonates with different theories of how expertise is developed. The outcome of this study adds to our understanding of how students conceptualize integration. The categories of 'integration' drawn out by the study are helpful in promoting further discussion of how eliciting students' own reports of cognition and may help the ongoing design of curricula by putting students at the center of the curriculum design process.


Assuntos
Educação Médica , Estudantes de Medicina/psicologia , Competência Clínica , Currículo , Educação Médica/métodos , Grupos Focais , Humanos , Entrevistas como Assunto
9.
BMC Med Educ ; 14: 64, 2014 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-24685070

RESUMO

BACKGROUND: The virtual clinical encounter (VCE) may function as an important support for medical students in or prior to clinical practice to train and ease communication and socioemotional interactions with patients. Few studies have however focused on the dynamics of interpersonal behaviors in clinical interviewing with a virtual patient (VP) and the affective responses evoked by such a learning experience. The study was designed to investigate the dynamics and congruence of interpersonal behaviors and socioemotional interaction exhibited during the learning experience in a VCE, and to evaluate which interaction design characteristics contribute most to the behavioral and affective engagement in medical students. METHODS: Thirty medical students (sixth semester) participated voluntarily in an exploratory observational study with a highly interactive VP case based on a trustworthy VP encounter with a natural and realistic dialogue interface. Students worked collaboratively in pairs. They were videotaped for further behavioral analysis and self-reported (in both a survey and an interview) their personal opinions, perceptions and attitudes about the VCE. A mixed methods approach was applied. RESULTS: All participants demonstrated an adequate, respectful and relevant clinical case management and to obtain psychosocial history. The collaborative workspace played its role and led to dynamic and engaged discussions fostering thus shared understanding. The results suggest that the VCE studied was perceived as a meaningful, intrinsically motivational and activating learning environment, and was found to socially and emotionally engage learners. We also found that VCEs have the potential to support the development of relevant and congruent interpersonal communication skills in trainees. CONCLUSIONS: By taking advantage of socioemotional interaction, VCEs promote not only critical reflection skills or strategy-selection skills, but also to develop listening and nonverbal skills, induce self-awareness and target coping behaviours. We believe that, if applied in early medical education, this learning approach may facilitate clinical encounters at an early stage and contribute to responsible clinical decision making.


Assuntos
Relações Médico-Paciente , Estudantes de Medicina/psicologia , Interface Usuário-Computador , Comunicação , Emoções , Feminino , Humanos , Masculino , Psicologia , Gravação em Vídeo , Adulto Jovem
10.
J Manipulative Physiol Ther ; 36(9): 626-32, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24161389

RESUMO

OBJECTIVE: The purpose of this study was to investigate the concordance of the upper limb neurodynamic tests (ULNTs) with a chosen reference standard, consisting of medical examination and magnetic resonance imaging (MRI), in patients with cervical radiculopathy. METHODS: This diagnostic cohort study included 51 consecutive patients referred to a center for spinal surgery for clinical investigation of cervical and/or arm pain in Sweden during the period of November 2007 to February 2008. The patients were exposed to the 4 different tests of ULNT. One diagnosis based on each of the tests separately and one based on the tests combined were compared with a chosen reference standard consisting of MRI, anamnestic features, and clinical examination. RESULTS: The ULNT (1-3 used combined) had a sensitivity of 0.97 and a specificity of 0.69. The results of ULNT (1-3 used combined) corresponded in 88.2% with the reference standard. Individually, the ULNT 1 (median) showed the highest validity, and ULNT 2b (radial), the lowest. CONCLUSION: Upper limb neurodynamic test (combined) showed a substantial agreement with findings from medical examination including MRI. These results indicate the importance of ULNT (combined) to complement the clinical examination of patients with radiculopathy.


Assuntos
Neuropatias do Plexo Braquial/diagnóstico , Imageamento por Ressonância Magnética/métodos , Exame Físico/métodos , Radiculopatia/diagnóstico , Adulto , Idoso , Estudos de Coortes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Exame Neurológico/métodos , Medição da Dor , Cuidados Pré-Operatórios/métodos , Curva ROC , Radiculopatia/cirurgia , Padrões de Referência , Índice de Gravidade de Doença , Extremidade Superior/fisiopatologia
11.
Educ Health (Abingdon) ; 26(3): 156-63, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-25001348

RESUMO

INTRODUCTION: Helping students learn to apply their newly learned basic science knowledge to clinical situations is a long-standing challenge for medical educators. This study aims to describe how medical students' knowledge of the basic sciences is construed toward the end of their medical curriculum, focusing on how senior medical students explain the physiology of a given scenario. Methods A group of final-year medical students from two universities was investigated. Interviews were performed and phenomenographic analysis was used to interpret students' understanding of the physiology underlying the onset of fatigue in an individual on an exercise bicycle. RESULTS: Three categories of description depict the qualitatively different ways the students conceptualized fatigue. A first category depicts well integrated physiological and bio-chemical knowledge characterized by equilibrium and causality. The second category contains conceptions of finite amount of substrate and juxtaposition of physiological concepts that are not fully integrated. The third category exhibits a fragmented understanding of disparate sections of knowledge without integration of basic science and clinical knowledge. DISCUSSION: Distinctive conceptions of fatigue based with varying completeness of students' understanding characterized the three identified categories. The students' conceptions of fatigue were based on varying understanding of how organ systems relate and of the thresholds that determine physiological processes. Medical instruction should focus on making governing steps in biological processes clear and providing opportunity for causal explanations of clinical scenarios containing bio-chemical as well as clinical knowledge. This augments earlier findings by adding descriptions in terms of the subject matter studied about how basic science is applied by students in clinical settings.


Assuntos
Competência Clínica , Educação de Graduação em Medicina , Fadiga , Aprendizagem Baseada em Problemas , Estudantes de Medicina , Adulto , Fadiga/fisiopatologia , Feminino , Humanos , Masculino , Pesquisa Qualitativa , Suécia , Adulto Jovem
12.
J Acad Nutr Diet ; 123(10S): S46-S58, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37730306

RESUMO

BACKGROUND: Limited research on food systems and food insecurity (FI) following disasters finds contextual differences in post-disaster food systems that shape dimensions of FI. Measurement limitations make it difficult to address FI and develop effective practices for disaster-affected communities. OBJECTIVE: To develop, validate, and test a Disaster Food Security Framework (DFSF). DESIGN: Mixed-methods approach was used, including in-depth interviews to understand lived experiences during disasters; expert panel input to validate DFSF designed using responses from in-depth interviews; and quantitative testing of robustness of DFSF using the coronavirus disease 2019 pandemic as a disaster example. PARTICIPANTS AND SETTING: The in-depth interviews included participants from Vermont (n = 5), North Carolina (n = 3), and Oklahoma (n = 2) who had been living in those states during Hurricane Irene (2011), Hurricane Florence (2018), the Moore tornadoes (2013), and coronavirus disease 2019 pandemic (2020). The expert panel consisted of researchers and practitioners from different US geographical regions and food-related disciplines (n = 18). For the quantitative testing survey, data from 4 US states (New York, New Mexico, Vermont, and Maryland; n = 3,228) from the National Food Access and COVID Research Team was used. MAIN OUTCOME MEASURES: The outcomes from the in-depth interviews were dimensions of disaster FI, those from the expert panel was a content validity ratio, and those from the quantitative testing was the number of items and components to be included. ANALYSES PERFORMED: Inductive and deductive reasoning were using when reporting on the in-depth interviews and expert panel results, including frequencies. The quantitative testing was conducted using multiple correspondence analysis. RESULTS: The in-depth interviews revealed four dimensions of FI: availability (supply and donation), accessibility (economic, physical, and social), acceptability (preference and health), and agency (infrastructure and self-efficacy). The panel of experts reported high content validity for the DFSF and its dimensions (content validity ratio >0.42), thus giving higher credibility to the DFSF. Multiple correspondence analysis performed on 25 food-related variables identified one component with 13 indicators representing three of the four dimensions: availability, acceptability, and accessibility, but not agency.


Assuntos
COVID-19 , Tempestades Ciclônicas , Desastres , Humanos , COVID-19/epidemiologia , Alimentos , North Carolina
13.
Mol Pain ; 8: 80, 2012 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-23102406

RESUMO

BACKGROUND: Secretagogin (Scgn), a member of the EF-hand calcium-binding protein (CaBP) superfamily, has recently been found in subsets of developing and adult neurons. Here, we have analyzed the expression of Scgn in dorsal root ganglia (DRGs) and trigeminal ganglia (TGs), and in spinal cord of mouse at the mRNA and protein levels, and in comparison to the well-known CaBPs, calbindin D-28k, parvalbumin and calretinin. Rat DRGs, TGs and spinal cord, as well as human DRGs and spinal cord were used to reveal phylogenetic variations. RESULTS: We found Scgn mRNA expressed in mouse and human DRGs and in mouse ventral spinal cord. Our immunohistochemical data showed a complementary distribution of Scgn and the three CaBPs in mouse DRG neurons and spinal cord. Scgn was expressed in ~7% of all mouse DRG neuron profiles, mainly small ones and almost exclusively co-localized with calcitonin gene-related peptide (CGRP). This co-localization was also seen in human, but not in rat DRGs. Scgn could be detected in the mouse sciatic nerve and accumulated proximal to its constriction. In mouse spinal cord, Scgn-positive neuronal cell bodies and fibers were found in gray matter, especially in the dorsal horn, with particularly high concentrations of fibers in the superficial laminae, as well as in cell bodies in inner lamina II and in some other laminae. A dense Scgn-positive fiber network and some small cell bodies were also found in the superficial dorsal horn of humans. In the ventral horn, a small number of neurons were Scgn-positive in mouse but not rat, confirming mRNA distribution. Both in mouse and rat, a subset of TG neurons contained Scgn. Dorsal rhizotomy strongly reduced Scgn fiber staining in the dorsal horn. Peripheral axotomy did not clearly affect Scgn expression in DRGs, dorsal horn or ventral horn neurons in mouse. CONCLUSIONS: Scgn is a CaBP expressed in a subpopulation of nociceptive DRG neurons and their processes in the dorsal horn of mouse, human and rat, the former two co-expressing CGRP, as well as in dorsal horn neurons in all three species. Functional implications of these findings include the cellular refinement of sensory information, in particular during the processing of pain.


Assuntos
Peptídeo Relacionado com Gene de Calcitonina/metabolismo , Proteínas de Ligação ao Cálcio/metabolismo , Neurônios Aferentes/citologia , Neurônios Aferentes/metabolismo , Células Receptoras Sensoriais/metabolismo , Medula Espinal/metabolismo , Animais , Peptídeo Relacionado com Gene de Calcitonina/genética , Proteínas de Ligação ao Cálcio/genética , Humanos , Masculino , Camundongos , Ratos , Secretagoginas , Células Receptoras Sensoriais/citologia , Medula Espinal/citologia
14.
Proc Natl Acad Sci U S A ; 106(48): 20476-81, 2009 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-19915139

RESUMO

Formation of lasting memories is believed to rely on structural alterations at the synaptic level. We had found that increased neuronal activity down-regulates Nogo receptor-1 (NgR1) in brain regions linked to memory formation and storage, and postulated this to be required for formation of lasting memories. We now show that mice with inducible overexpression of NgR1 in forebrain neurons have normal long-term potentiation and normal 24-h memory, but severely impaired month-long memory in both passive avoidance and swim maze tests. Blocking transgene expression normalizes these memory impairments. Nogo, Lingo-1, Troy, endogenous NgR1, and BDNF mRNA expression levels were not altered by transgene expression, suggesting that the impaired ability to form lasting memories is directly coupled to inability to down-regulate NgR1. Regulation of NgR1 may therefore serve as a key regulator of memory consolidation. Understanding the molecular underpinnings of synaptic rearrangements that carry lasting memories may facilitate development of treatments for memory dysfunction.


Assuntos
Regulação da Expressão Gênica/fisiologia , Memória/fisiologia , Proteínas da Mielina/fisiologia , Prosencéfalo/metabolismo , Animais , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Cromatografia Líquida de Alta Pressão , Eletrofisiologia , Immunoblotting , Imuno-Histoquímica , Hibridização In Situ , Aprendizagem em Labirinto/fisiologia , Proteínas de Membrana/metabolismo , Camundongos , Camundongos Transgênicos , Proteínas da Mielina/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Proteínas Nogo , Receptores do Fator de Necrose Tumoral/metabolismo , Teste de Desempenho do Rota-Rod , Transgenes/genética
15.
Bone ; 157: 116324, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-34998981

RESUMO

Tissue injury leads to the well-orchestrated mobilization of systemic and local innate and adaptive immune cells. During aging, immune cell recruitment is dysregulated, resulting in an aberrant inflammatory response that is detrimental for successful healing. Here, we precisely define the systemic and local immune cell response after femur fracture in young and aging mice and identify increased toll-like receptor signaling as a potential culprit for the abnormal immune cell recruitment observed in aging animals. Myd88, an upstream regulator of TLR-signaling lies at the core of this aging phenotype, and local treatment of femur fractures with a Myd88 antagonist in middle-aged mice reverses the aging phenotype of impaired fracture healing, thus offering a promising therapeutic target that could overcome the negative impact of aging on bone regeneration.


Assuntos
Fraturas Ósseas , Fator 88 de Diferenciação Mieloide , Imunidade Adaptativa , Envelhecimento , Animais , Regeneração Óssea , Consolidação da Fratura , Imunidade Inata , Camundongos , Fator 88 de Diferenciação Mieloide/genética
16.
Nat Hum Behav ; 5(5): 557-565, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33785897

RESUMO

The emergence of SARS-CoV-2 and attempts to limit its spread have resulted in a contraction of the global economy. Here we document the socioeconomic impacts of the pandemic among households, adults and children in low-income countries. To do so, we rely on longitudinal household survey data from Ethiopia, Malawi, Nigeria and Uganda, originating from pre-COVID-19 face-to-face household surveys plus phone surveys implemented during the pandemic. We estimate that 256 million individuals-77% of the population-live in households that have lost income during the pandemic. Attempts to cope with this loss are exacerbated by food insecurity and an inability to access medicine and staple foods. Finally, we find that student-teacher contact has dropped from a pre-COVID-19 rate of 96% to just 17% among households with school-aged children. These findings can inform decisions by governments and international organizations on measures to mitigate the effects of the COVID-19 pandemic.


Assuntos
COVID-19/economia , COVID-19/epidemiologia , Pandemias , Etiópia/epidemiologia , Insegurança Alimentar , Humanos , Estudos Longitudinais , Malaui/epidemiologia , Nigéria/epidemiologia , Pobreza , Fatores Socioeconômicos , Uganda/epidemiologia
17.
Curr Dev Nutr ; 5(12): nzab135, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34934898

RESUMO

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic profoundly affected food systems including food security. Understanding how the COVID-19 pandemic impacted food security is important to provide support and identify long-term impacts and needs. OBJECTIVE: The National Food Access and COVID research Team (NFACT) was formed to assess food security over different US study sites throughout the pandemic, using common instruments and measurements. This study presents results from 18 study sites across 15 states and nationally over the first year of the COVID-19 pandemic. METHODS: A validated survey instrument was developed and implemented in whole or part through an online survey of adults across the sites throughout the first year of the pandemic, representing 22 separate surveys. Sampling methods for each study site were convenience, representative, or high-risk targeted. Food security was measured using the USDA 6-item module. Food security prevalence was analyzed using ANOVA by sampling method to assess statistically significant differences. RESULTS: Respondents (n = 27,168) indicate higher prevalence of food insecurity (low or very low food security) since the COVID-19 pandemic, compared with before the pandemic. In nearly all study sites, there is a higher prevalence of food insecurity among Black, Indigenous, and People of Color (BIPOC), households with children, and those with job disruptions. The findings demonstrate lingering food insecurity, with high prevalence over time in sites with repeat cross-sectional surveys. There are no statistically significant differences between convenience and representative surveys, but a statistically higher prevalence of food insecurity among high-risk compared with convenience surveys. CONCLUSIONS: This comprehensive study demonstrates a higher prevalence of food insecurity in the first year of the COVID-19 pandemic. These impacts were prevalent for certain demographic groups, and most pronounced for surveys targeting high-risk populations. Results especially document the continued high levels of food insecurity, as well as the variability in estimates due to the survey implementation method.

18.
Adv Health Sci Educ Theory Pract ; 15(2): 153-65, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-19551482

RESUMO

The experience of clinical teachers as well as research results about senior medical students' understanding of basic science concepts has much been debated. To gain a better understanding about how this knowledge-transformation is managed by medical students, this work aims at investigating their ways of setting about learning anatomy. Second-year medical students were interviewed with a focus on their approach to learning and their way of organizing their studies in anatomy. Phenomenographic analysis of the interviews was performed in 2007 to explore the complex field of learning anatomy. Subjects were found to hold conceptions of a dual notion of the field of anatomy and the interplay between details and wholes permeated their ways of studying with an obvious endeavor of understanding anatomy in terms of connectedness and meaning. The students' ways of approaching the learning task was characterized by three categories of description; the subjects experienced their anatomy studies as memorizing, contextualizing or experiencing. The study reveals aspects of learning anatomy indicating a deficit in meaningfulness. Variation in approach to learning and contextualization of anatomy are suggested as key-elements in how the students arrive at understanding. This should be acknowledged through careful variation of the integration of anatomy in future design of medical curricula.


Assuntos
Anatomia/educação , Educação de Graduação em Medicina/métodos , Aprendizagem , Humanos
19.
Adv Health Sci Educ Theory Pract ; 13(3): 345-60, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-17203269

RESUMO

Clinical teachers often complain that medical students have forgotten or somehow "lost" knowledge that has been taught at pre-clinical levels at the time of entering the clinical part of education. The purpose of this qualitative study was to explore, whether transfer of knowledge was identified as a problem by the teaching staff of anatomy and surgery, and if so, what strategies they used to overcome it. Semi-structured interviews were conducted with ten medical teachers in anatomy and surgery. Most teachers recognised that there was a problem of transfer and some individuals had adopted strategies to address this. However, there was no formal educational strategy suggested to overcome the problem of transfer. The conclusion is that transfer needs to be addressed both by basic science teachers and clinical teachers. There is a need for a mutual educational discourse of the contexts students will face.


Assuntos
Anatomia/educação , Docentes de Medicina , Cirurgia Geral/educação , Retenção Psicológica , Competência Clínica , Currículo , Educação de Graduação em Medicina , Humanos , Entrevistas como Assunto , Aprendizagem
20.
Med Teach ; 30(1): 72-9, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18278655

RESUMO

BACKGROUND: The relationship between medical students' well-being, motivation, and their conceptions of learning and knowledge has not been previously explored. AIMS: This study aimed to validate a research instrument intending to measure medical students' (n = 280) (1) experiences of stress, anxiety and disinterest, (2) motivational (thinking) strategies, (3) conceptions of learning and knowledge (epistemologies), and (4) approaches to learning. METHODS: We developed an instrument, MED NORD, which is a composition of scales measuring different theoretical constructs that previously have shown good predictive value, validity and reliability. A principal component analysis with Varimax-rotation was performed in order to see how the scales related to each other. RESULTS: The internal consistency reliability was found to be satisfactory or good for each scale. The results showed five factors: Dysfunctional Orientation, Collaborative Knowledge Building Orientation, Cookbook Orientation, Social Orientation, and Individual Abilities Orientation. These study orientations were related to how medical students perceived their learning environment. CONCLUSIONS: The new tool showed consistency and validity and was judged appropriate for future use in measuring medical students' well-being and study orientations.


Assuntos
Conhecimentos, Atitudes e Prática em Saúde , Saúde Mental , Testes Psicológicos , Estudantes de Medicina/psicologia , Adulto , Feminino , Humanos , Masculino , Motivação , Projetos Piloto , Valor Preditivo dos Testes , Análise de Componente Principal , Reprodutibilidade dos Testes , Percepção Social , Estudantes de Medicina/estatística & dados numéricos , Inquéritos e Questionários , Suécia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA