Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 16 de 16
Filtrar
1.
Cancer Rep (Hoboken) ; 7(2): e1998, 2024 02.
Artigo em Inglês | MEDLINE | ID: mdl-38389399

RESUMO

BACKGROUND: Compared with older cancer caregivers, young adult cancer caregivers (YACC) experience greater stress and depression during the first 6 months of caregiving. Social support can buffer the negative psychological effects associated with cancer caregiving. However, the misalignment of social support is associated with increased distress and worse emotional well-being. As YACC are more likely to utilize social media (SM) to seek social support compared with older cancer caregivers, they may be at greater risk of experiencing the misalignment of social support and related negative outcomes. OBJECTIVE: The purpose of this study was to identify ways that SM posts containing support for YACC's were potentially misaligned with the social support desired by YACC. METHODS: In this secondary analysis, cancer-related SM posts (N = 760) from 34 YACC's SM accounts were extracted for 6 months following the day of cancer diagnosis and imported into NVivo qualitative analysis software. Open coding of posts from four YACC identified a pattern of SM posts containing responses that may misalign with social support requests, and could be perceived as dismissive of YACC's emotions. Similar posts were grouped together, forming categories which were used to create a codebook and applied in coding all posts from the remaining 30 YACC. RESULTS: Content analysis identified three categories of social support misalignment originating from YACC's SM posts: supplications (n = 251, 33%), prevailing (n = 7, 10.1%), and consolations (n = 16, 2.1%). Supplications involved prayer or trust in god, prevailing posts compared dealing with cancer to a fight and suggested that the person would overcome cancer, and consolations used quotes, song lyrics, and or general reassurances in SM posts. CONCLUSIONS: Findings suggest that when YACC use SM during cancer experiences, they may interpret SM posts as social support or as misalignment of social support requests, which in turn can lead to either improved quality of life or additional distress (respectively). This study adds to the body of knowledge regarding how YACC use social media for social support and may inform future interventions designed to match YACC's desired support with support offered.


Assuntos
Neoplasias , Mídias Sociais , Humanos , Adulto Jovem , Cuidadores , Qualidade de Vida/psicologia , Apoio Social , Neoplasias/terapia , Neoplasias/psicologia
2.
J Surg Res ; 295: 158-167, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38016269

RESUMO

INTRODUCTION: Artificial intelligence (AI) may benefit pediatric healthcare, but it also raises ethical and pragmatic questions. Parental support is important for the advancement of AI in pediatric medicine. However, there is little literature describing parental attitudes toward AI in pediatric healthcare, and existing studies do not represent parents of hospitalized children well. METHODS: We administered the Attitudes toward Artificial Intelligence in Pediatric Healthcare, a validated survey, to parents of hospitalized children in a single tertiary children's hospital. Surveys were administered by trained study personnel (11/2/2021-5/1/2022). Demographic data were collected. An Attitudes toward Artificial Intelligence in Pediatric Healthcare score, assessing openness toward AI-assisted medicine, was calculated for seven areas of concern. Subgroup analyses were conducted using Mann-Whitney U tests to assess the effect of race, gender, education, insurance, length of stay, and intensive care unit (ICU) admission on AI use. RESULTS: We approached 90 parents and conducted 76 surveys for a response rate of 84%. Overall, parents were open to the use of AI in pediatric medicine. Social justice, convenience, privacy, and shared decision-making were important concerns. Parents of children admitted to an ICU expressed the most significantly different attitudes compared to parents of children not admitted to an ICU. CONCLUSIONS: Parents were overall supportive of AI-assisted healthcare decision-making. In particular, parents of children admitted to ICU have significantly different attitudes, and further study is needed to characterize these differences. Parents value transparency and disclosure pathways should be developed to support this expectation.


Assuntos
Inteligência Artificial , Criança Hospitalizada , Humanos , Criança , Atitude , Unidades de Terapia Intensiva , Pais
3.
Artigo em Inglês | MEDLINE | ID: mdl-37681786

RESUMO

As the U.S. population's demographics shift, young U.S. adults are increasingly engaged in informal caregiving for aging generations. Yet, there is little research on the unique experiences and needs of young adults who take on caregiving roles for adult cancer patients. Herein we demonstrate through a theoretical description that young adult cancer care partners deserve distinct recognition in the cancer control continuum given the psychological, physical, financial, and social features unique to their cancer experience.


Assuntos
Cuidadores , Neoplasias , Humanos , Adulto Jovem , Envelhecimento , Exame Físico , Reconhecimento Psicológico , Neoplasias/terapia
4.
Proc Biol Sci ; 289(1969): 20212564, 2022 02 23.
Artigo em Inglês | MEDLINE | ID: mdl-35193404

RESUMO

Mountain gorillas are particularly inbred compared to other gorillas and even the most inbred human populations. As mountain gorilla skeletal material accumulated during the 1970s, researchers noted their pronounced facial asymmetry and hypothesized that it reflects a population-wide chewing side preference. However, asymmetry has also been linked to environmental and genetic stress in experimental models. Here, we examine facial asymmetry in 114 crania from three Gorilla subspecies using 3D geometric morphometrics. We measure fluctuating asymmetry (FA), defined as random deviations from perfect symmetry, and population-specific patterns of directional asymmetry (DA). Mountain gorillas, with a current population size of about 1000 individuals, have the highest degree of facial FA (explaining 17% of total facial shape variation), followed by Grauer gorillas (9%) and western lowland gorillas (6%), despite the latter experiencing the greatest ecological and dietary variability. DA, while significant in all three taxa, explains relatively less shape variation than FA does. Facial asymmetry correlates neither with tooth wear asymmetry nor increases with age in a mountain gorilla subsample, undermining the hypothesis that facial asymmetry is driven by chewing side preference. An examination of temporal trends shows that stress-induced developmental instability has increased over the last 100 years in these endangered apes.


Assuntos
Gorilla gorilla , Hominidae , Animais , Assimetria Facial/veterinária , Variação Genética , Gorilla gorilla/genética , Humanos
5.
Front Pediatr ; 9: 748368, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34778138

RESUMO

Historically, children evaluated for vomiting and diarrhea secondary to viral enteritis have symptoms lasting 2-4 days and respond to supportive care, including oral rehydration and anti-emetics if required. Recently, within a 14-day timespan, we encountered three children with severe diarrhea who rapidly became dehydrated and went into hypotensive shock. Although SARS-CoV-2 molecular tests were negative by nasopharyngeal swab, all were later found to have MIS-C. This small case series underscores features reported in previous larger studies and emphasizes the rapid clinical evolution of this condition. We highlight the importance of early recognition of cardinal laboratory findings characteristic of MIS-C (i.e., lymphopenia, markedly elevated acute phase reactants, and hypoalbuminemia). We also show serologic evidence that the pathophysiological mechanism of SARS-CoV-2 related diarrhea may differ from other causes of dehydrating vomiting and diarrhea, with no serologic evidence of villus cell injury.

6.
Am J Phys Anthropol ; 176(4): 684-691, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34308558

RESUMO

OBJECTIVES: Existing data on bonobo and chimpanzee dental eruption timing are derived predominantly from captive individuals or deceased wild individuals. However, recent advances in noninvasive photographic monitoring of living, wild apes have enabled researchers to characterize dental eruption in relatively healthy individuals under naturalistic conditions. At present, such data are available for only one population of wild chimpanzees. We report data for an additional population of wild chimpanzees and the first dental eruption data for wild bonobos. MATERIALS AND METHODS: We collected photographs and video footage of teeth from the open mouths of wild bonobos and East African chimpanzees of known age from LuiKotale, Democratic Republic of the Congo, and Gombe National Park, Tanzania, respectively. We scored the presence and absence of deciduous teeth from photographs and video footage to characterize deciduous dental eruption timing in these two populations. RESULTS: Deciduous dental eruption ages in our sample fall within the range of variation previously documented for captive chimpanzees, but eruption ages are later in wild than in captive contexts. We found substantial variation in deciduous canine eruption timing, particularly among bonobos. One bonobo had a deciduous canine present by 227 days old while another did not have a deciduous canine present at 477 days old. DISCUSSION: Our data indicate that deciduous teeth erupt later in wild individuals than in captive individuals. We also found that deciduous dental eruption timing varies considerably between individuals within our study populations, a pattern that is consistent with previous studies. Future studies should consider sources of variation in deciduous canine eruption timing and relationships with other aspects of life history as additional data become available.


Assuntos
Hominidae , Pan troglodytes , Animais , Humanos , Pan paniscus , Tanzânia , Erupção Dentária
7.
Pediatr Infect Dis J ; 39(12): e447-e449, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33060516

RESUMO

Multisystem inflammatory syndrome in children is a severe illness associated with the SARS-CoV-2 pandemic that possesses features overlapping with other pediatric diseases causing systemic inflammation. Significant diagnostic and treatment uncertainty remain, and clinicians should maintain a broad differential when evaluating patients for multisystem inflammatory syndrome in children, as antibiotic-susceptible infections such as murine typhus may present similarly.


Assuntos
COVID-19/complicações , Surtos de Doenças , Síndrome de Resposta Inflamatória Sistêmica/diagnóstico , Tifo Endêmico Transmitido por Pulgas/diagnóstico , Tifo Endêmico Transmitido por Pulgas/epidemiologia , Adolescente , Animais , Biomarcadores , COVID-19/diagnóstico , COVID-19/epidemiologia , COVID-19/etiologia , Criança , Humanos , Camundongos , Pandemias , Avaliação de Sintomas , Síndrome de Resposta Inflamatória Sistêmica/epidemiologia , Síndrome de Resposta Inflamatória Sistêmica/etiologia , Tifo Endêmico Transmitido por Pulgas/etiologia , Tifo Endêmico Transmitido por Pulgas/transmissão
8.
J Hum Evol ; 137: 102691, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31704354

RESUMO

Deeper or more 'severe' linear enamel hypoplasia (LEH) defects are hypothesized to reflect more severe stress during development, but it is not yet clear how depth is influenced by intrinsic enamel growth patterns. Recent work documented inter- and intraspecific differences in LEH defect depth in extant great apes, with mountain gorillas having shallower defects than other taxa, and females having deeper defects than males. Here, we assess the correspondence of inter- and intraspecific defect depth and intrinsic aspects of enamel growth: enamel extension rates, outer enamel striae of Retzius angles, and linear enamel thickness. Thin sections of great ape canines (n = 40) from Gorilla beringei beringei, Gorilla gorilla gorilla, Pan troglodytes, and Pongo spp. were analyzed. Enamel extension rates were calculated within deciles of enamel-dentine junction length. Linear enamel thickness and the angle of intersection between striae of Retzius and the outer enamel surface were measured in the imbricational enamel. Mountain gorillas have faster enamel extension rates and shallower striae angles than the other taxa examined. Mountain gorillas have thinner imbricational enamel than western lowland gorillas and orangutans, but not chimpanzees. In the combined-taxon sample, females exhibit larger striae angles and thicker imbricational enamel than males. Enamel extension rates are highly negatively correlated with striae angles and LEH defect depth. Enamel growth variation corresponds with documented inter- and intraspecific differences in LEH defect depth in great ape canines. Mountain gorillas have shallower striae angles and faster extension rates than other taxa, which might explain their shallow LEH defect morphology and the underestimation of their LEH prevalence in previous studies. These results suggest that stressors of similar magnitude and timing might produce defects of different depths in one species or sex vs. another, which has implications for interpretations of stress histories in hominins with variable enamel growth patterns.


Assuntos
Doenças dos Símios Antropoides/patologia , Dente Canino/crescimento & desenvolvimento , Hipoplasia do Esmalte Dentário/veterinária , Hominidae/crescimento & desenvolvimento , Animais , Dente Canino/anormalidades , Hipoplasia do Esmalte Dentário/patologia , Feminino , Hominidae/anormalidades , Masculino
9.
BMC Med Educ ; 18(1): 287, 2018 Dec 04.
Artigo em Inglês | MEDLINE | ID: mdl-30514279

RESUMO

BACKGROUND: Traditionally, quizzes have been applied as a tool for summative assessment, though literature suggests their use as a formative assessment can improve motivation and content retention. With this premise, we implemented a series of intermittent, online quizzes known as the Board Examination Simulation Exercise (BESE). We sought to demonstrate an association between BESE participation and scores and performance on the American Board of Pediatrics (ABP) Certifying Examination (CE). METHODS: Residents were assigned online quizzes on a single topic at 2 week intervals that consisted of 20 multiple choice questions written by the study authors. This analysis includes graduates of 3 Pediatric and Internal Medicine-Pediatrics residency programs. RESULTS: Data were available for 329 residents. The overall BESE score weakly correlated with ABP CE score (n = 287; r = 0.39, p < 0.0001). ABP CE pass rates increased from 2009 to 2016 at all programs combined (p = 0.0001). A composite BESE score ≤ 11 had sensitivity of 54% and specificity of 80% for predicting ABP CE failure on the first attempt. There was no difference in ABP CE failure rates or scores by number of completed quizzes. CONCLUSION: Intermittent online quizzes implemented at three pediatric residency programs were associated with overall increasing ABP CE pass rates. BESE increased program emphasis on board preparation. Residents with lower BESE scores more often failed ABP CE. Though additional data are needed, BESE is a promising tool for pediatric resident learning and board preparation. It may also aid in earlier identification of residents at higher risk of failing the ABP CE and facilitate targeted interventions.


Assuntos
Certificação , Competência Clínica/normas , Instrução por Computador , Internato e Residência/métodos , Pediatria/educação , Avaliação Educacional , Humanos , Pediatria/normas , Avaliação de Programas e Projetos de Saúde , Conselhos de Especialidade Profissional , Estados Unidos
10.
Am J Phys Anthropol ; 163(1): 129-147, 2017 05.
Artigo em Inglês | MEDLINE | ID: mdl-28251607

RESUMO

OBJECTIVES: While dental development is important to life history investigations, data from wild known-aged great apes are scarce. We report on the first radiographic examination of dental development in wild Virunga mountain gorillas, using known-age skeletal samples recovered in Rwanda. MATERIALS AND METHODS: In 43 individuals (0.0-14.94 years), we collected radiographs of mandibular molars, and where possible, cone beam CT scans. Molar crown and root calcification status was assessed using two established staging systems, and age prediction equations generated using polynomial regression. Results were compared to available data from known-age captive and wild chimpanzees. RESULTS: Mountain gorillas generally fell within reported captive chimpanzee distributions or exceeded them, exhibiting older ages at equivalent radiographic stages of development. Differences reflect delayed initiation and/or an extended duration of second molar crown development, and extended first and second molar root development, in mountain gorillas compared to captive chimpanzees. However, differences in the duration of molar root development were less evident compared to wild chimpanzees. DISCUSSION: Despite sample limitations, our findings extend the known range of variation in radiographic estimates of molar formation timing in great apes, and provide a new age prediction technique based on wild specimens. However, mountain gorillas do not appear accelerated in radiographic assessment of molar formation compared to chimpanzees, as they are for other life history traits. Future studies should aim to resolve the influence of species differences, wild versus captive environments, and/or sampling phenomena on patterns observed here, and more generally, how they relate to variation in tooth size, eruption timing, and developmental life history.


Assuntos
Gorilla gorilla/crescimento & desenvolvimento , Dente Molar/diagnóstico por imagem , Dente Molar/crescimento & desenvolvimento , Animais , Antropologia Física , Feminino , Masculino , Radiografia Dentária , Ruanda
11.
Pediatrics ; 138(5)2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27940771

RESUMO

A career in pediatrics can bring great joy and satisfaction. It can also be challenging and lead some providers to manifest burnout and depression. A curriculum designed to help pediatric health providers acquire resilience and adaptive skills may be a key element in transforming times of anxiety and grief into rewarding professional experiences. The need for this curriculum was identified by the American Academy of Pediatrics Section on Medical Students, Residents and Fellowship Trainees. A working group of educators developed this curriculum to address the professional attitudes, knowledge, and skills essential to thrive despite the many stressors inevitable in clinical care. Fourteen modules incorporating adult learning theory were developed. The first 2 sections of the curriculum address the knowledge and skills to approach disclosure of life-altering diagnoses, and the second 2 sections focus on the provider's responses to difficult patient care experiences and their needs to develop strategies to maintain their own well-being. This curriculum addresses the intellectual and emotional characteristics patient care medical professionals need to provide high-quality, compassionate care while also addressing active and intentional ways to maintain personal wellness and resilience.


Assuntos
Atitude Frente a Morte , Competência Clínica , Currículo , Pesar , Pediatria/educação , Adaptação Psicológica , Adulto , Atitude do Pessoal de Saúde , Esgotamento Profissional/prevenção & controle , Educação de Pós-Graduação em Medicina/métodos , Feminino , Humanos , Internato e Residência/métodos , Masculino , Sociedades Médicas , Estados Unidos
12.
BMJ Open ; 6(9): e012060, 2016 09 16.
Artigo em Inglês | MEDLINE | ID: mdl-27638496

RESUMO

INTRODUCTION: Recent studies suggest that the high mortality rate of respiratory viral infections is a result of an overactive neutrophilic inflammatory response. Macrolides have anti-inflammatory properties, including the ability to downregulate the inflammatory cascade, attenuate excessive cytokine production in viral infections, and may reduce virus-related exacerbations. In this study, we will test the hypothesis that prophylactic macrolides will reduce the severity of respiratory viral illness in children with chronic lung disease by preventing the full activation of the inflammatory cascade. METHODS AND ANALYSIS: A randomised double-blind placebo-controlled trial that will enrol 92 children to receive either azithromycin or placebo for a period of 3-6 months during two respiratory syncytial virus (RSV) seasons (2015-2016 and 2016-2017). We expect a reduction of at least 20% in the total number of days of unscheduled face-to-face encounters in the treatment group as compared with placebo group. Standard frequentist and Bayesian analyses will be performed using an intent-to-treat approach. DISCUSSION: We predict that the prophylactic use of azithromycin will reduce the morbidity associated with respiratory viral infections during the winter season in patients with chronic lung disease as evidenced by a reduction in the total number of days with unscheduled face-to-face provider encounters. ETHICS AND DISSEMINATION: This research study was approved by the Institutional Review Board of the University of Texas Health Science Center in Houston on 9 October 2014. On completion, the results will be published. TRIAL REGISTRATION NUMBER: NCT02544984.


Assuntos
Antibacterianos/uso terapêutico , Azitromicina/uso terapêutico , Doença Crônica/tratamento farmacológico , Pneumopatias/tratamento farmacológico , Macrolídeos/uso terapêutico , Infecções Respiratórias/tratamento farmacológico , Pré-Escolar , Doença Crônica/epidemiologia , Doença Crônica/prevenção & controle , Protocolos Clínicos , Método Duplo-Cego , Feminino , Humanos , Lactente , Pneumopatias/epidemiologia , Pneumopatias/prevenção & controle , Masculino , Profilaxia Pré-Exposição , Qualidade de Vida , Infecções Respiratórias/epidemiologia , Infecções Respiratórias/microbiologia , Infecções Respiratórias/virologia , Texas/epidemiologia , Resultado do Tratamento
13.
Case Rep Pediatr ; 2016: 8359838, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27418995

RESUMO

We present a case of a 17-year-old Hispanic male with Arnold-Chiari Type 1 [AC-Type 1] with syringomyelia, status post decompression, who complains of exercise intolerance, headaches, and fatigue with exertion. The patient was found to have diurnal hypercapnia and nocturnal alveolar hypoventilation. Cardiopulmonary testing revealed blunting of the ventilatory response to the rise in carbon dioxide (CO2) resulting in failure of the parallel correlation between increased CO2 levels and ventilation; the expected vertical relationship between PETCO2 and minute ventilation during exercise was replaced with an almost horizontal relationship. No new pathology of the brainstem was discovered by MRI or neurological evaluation to explain this phenomenon. The patient was placed on continuous noninvasive open ventilation (NIOV) during the day and CPAP at night for a period of 6 months. His pCO2 level decreased to normal limits and his symptoms improved; specifically, he experienced less headaches and fatigue during exercise. In this report, we describe the abnormal response to exercise that patients with AC-Type 1 could potentially experience, even after decompression, characterized by the impairment of ventilator response to hypercapnia during exertion, reflecting a complete loss of chemical influence on breathing with no evidence of abnormality in the corticospinal pathway.

14.
Pediatr Allergy Immunol Pulmonol ; 28(3): 177-182, 2015 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-26421214

RESUMO

Objective: Asthma in sickle cell disease (SCD) patients is associated with elevated morbidity and mortality. Early detection and initiation of treatment may therefore lead to improved outcome. Utility of an asthma screening questionnaire to identify obstructive airway disease and physician diagnosed asthma in children with SCD at an outpatient setting as an effective, easy-to-administer screening tool has not previously been evaluated in this population. Methods: A previously validated asthma screening questionnaire and spirometry were prospectively administered to 41 SCD children at a routine clinic visit. Results: Prevalence of obstructive airway was 51.2% (n = 21) and physician diagnosis of asthma 33.3% (n = 13). Sensitivity (40%) and specificity (75%) of the questionnaire was poor in detecting obstructive airway disease, but sensitivity (77%), specificity (100%), positive predictive value (100%), and negative predictive value (90%) were high in detecting physician diagnosis of asthma. Conclusion: An asthma screening questionnaire could be a useful tool in identifying at-risk SCD children who may benefit from further management.

15.
Curr Probl Pediatr Adolesc Health Care ; 44(6): 170-81, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24981666

RESUMO

The application of the best practices of teaching adults to the education of adults in medical education settings is important in the process of transforming learners to become and remain effective physicians. Medical education at all levels should be designed to equip physicians with the knowledge, clinical skills, and professionalism that are required to deliver quality patient care. The ultimate outcome is the health of the patient and the health status of the society. In the translational science of medical education, improved patient outcomes linked directly to educational events are the ultimate goal and are best defined by rigorous medical education research efforts. To best develop faculty, the same principles of adult education and teaching adults apply. In a systematic review of faculty development initiatives designed to improve teaching effectiveness in medical education, the use of experiential learning, feedback, effective relationships with peers, and diverse educational methods were found to be most important in the success of these programs. In this article, we present 5 examples of applying the best practices in teaching adults and utilizing the emerging understanding of the neurobiology of learning in teaching students, trainees, and practitioners. These include (1) use of standardized patients to develop communication skills, (2) use of online quizzes to assess knowledge and aid self-directed learning, (3) use of practice sessions and video clips to enhance significant learning of teaching skills, (4) use of case-based discussions to develop professionalism concepts and skills, and (5) use of the American Academy of Pediatrics PediaLink as a model for individualized learner-directed online learning. These examples highlight how experiential leaning, providing valuable feedback, opportunities for practice, and stimulation of self-directed learning can be utilized as medical education continues its dynamic transformation in the years ahead.


Assuntos
Competência Clínica/normas , Educação Médica , Aprendizagem , Pediatria/educação , Ensino , Adulto , Atitude , Comportamento Cooperativo , Educação Médica/normas , Educação Médica/tendências , Medicina Baseada em Evidências , Humanos , Aprendizagem/fisiologia , Desenvolvimento de Pessoal , Ensino/normas , Ensino/tendências
16.
J Immunol ; 185(9): 5561-8, 2010 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-20926792

RESUMO

Lymphocyte recruitment to intestinal tissues depends on ß(7) integrins. In this study, we studied disease severity and lymphocyte recruitment into the small intestine in SAMP1/YitFc mice, which develop chronic ileitis with similarity to human Crohn's disease. To assess the role of ß(7) integrins in chronic ileitis, we generated SAMP1/YitFc lacking ß(7) integrins (SAMP1/YitFc Itgb7(-/-)) using a congenic strain developed via marker-assisted selection. We analyzed ileal inflammation in SAMP1/YitFc and SAMP1/YitFc Itgb7(-/-) mice by histopathology and the distribution of T and B lymphocytes in the mesenteric lymph nodes (MLNs) by flow cytometry. Short-term (18 h) adoptive transfer experiments were used to study the in vivo homing capacity of T and B lymphocytes. In both young (<20 wk) and old (20-50 wk) SAMP1/YitFc Itgb7(-/-) mice, ileitis was reduced by 30-50% compared with SAMP1/YitFc mice. SAMP1/YitFc Itgb7(-/-) mice showed a dramatic 67% reduction in the size of their MLNs, which was caused by a 85% reduction in lymphocyte numbers and reduced short-term B cell homing. Flow cytometric analysis revealed a highly significant decrease in the percentage of B cells in MLNs of SAMP1/YitFc Itgb7(-/-) mice. Cotransfer of SAMP1/YitFc MLN B cells but not SAMP1/YitFc Itgb7(-/-) MLN B cells along with CD4(+) T cells resulted in exacerbated ileitis severity in SCID mice. Our findings suggest that ß(7) integrins play an essential role in spontaneous chronic ileitis in vivo by promoting homing of disease-exacerbating B cells to MLNs and other intestinal tissues.


Assuntos
Linfócitos B/imunologia , Quimiotaxia de Leucócito/imunologia , Ileíte/patologia , Cadeias beta de Integrinas/imunologia , Animais , Linfócitos B/citologia , Doença Crônica , Citometria de Fluxo , Ileíte/imunologia , Ileíte/metabolismo , Cadeias beta de Integrinas/metabolismo , Intestino Delgado/imunologia , Intestino Delgado/patologia , Linfonodos/imunologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Linfócitos T/imunologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA