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1.
Front Psychol ; 15: 1339230, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38903468

RESUMO

Introduction: Childcare center closures during COVID-19 impacted education for approximately 40 million children nationwide. Unfortunately, COVID-19 restrictions significantly limited the extent that outside personnel could provide in-person support to educators, resulting in the need for innovative approaches to meet childcare centers' needs. A virtual robotic telepresence approach was applied to early childhood consultation models to promote child resilience while mitigating COVID-19 risks. The goal of this study was to examine how training influenced consultants' and childcare staff uptake of the virtual robotic telepresence consultation approach and their acceptance of this technology. Methods: Ten early childhood consultants received multimedia/simulation training and weekly communities of practice related to virtual telepresence robotic consultation. Telepresence robotic consultation equipment was deployed to 16 childcare centers in a diverse multilingual metropolitan area as a part of a larger randomized controlled trial. Consultants trained childcare staff (14 center directors and 58 teachers) on how to receive virtual telepresence robotic consultation. Demographic information and measures of technology acceptability and uptake were collected from childcare staff and consultants. A mixed methods approach was used including multilevel modeling and focus groups to examine consultation uptake, acceptability, barriers, and facilitators of virtual telepresence robotic consultation implementation. Results: Consultants and childcare staff generally perceived the virtual telepresence consultation approach to be useful and easy to use. Consultant perceptions of the acceptability of technology did not change over time. Childcare staff, center, and consultant factors impacted the uptake of the virtual robotic telepresence consultation approach and childcare staff acceptance of the technology. Focus groups revealed that consultants believed that additional hands-on training with childcare staff would have benefited implementation and expressed a desire for a hybrid approach for consultation. Discussion: Perceptions of telepresence robotic consultation acceptability are discussed, including future recommendations for training.

2.
Infant Ment Health J ; 45(4): 449-463, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38780350

RESUMO

The present study validated a newly developed easy-to-use observational instrument, the Health Environment Rating Scale-Early Childhood Consultation-Classroom version (HERS-ECC-C), to measure the quality of the classroom environment within early care and education centers participating in a mental health consultation program in a diverse area of the southeastern United States. Using a confirmatory factor analysis, three factors emerged capturing critical aspects of a high-quality classroom environment and demonstrated good reliability: (1) Supportive Practices, Positive Socioemotional Practices, and Classroom Management (α = .88), (2) Health and Family Communication (α = .79), and (3) Individualizing to Children's Needs (α = .80). Criterion-related validity was established through concurrent associations between the three HERS-ECC-C subscales and the domains of the Classroom Assessment Scoring System (CLASS) and predictive associations with the Childcare Worker Job Stress Inventory. The HERS-ECC-C Supportive Practices and Health and Family Communication subscales were associated with all three CLASS domains, and the Individualizing to Children's Needs subscale was associated with the CLASS Instructional support domain. Higher HERS-ECC-C subscale scores were associated with lower teacher-reported job stress. Findings provide initial evidence to support the use and continued development of the HERS-ECC-C as a tool to evaluate programs and classrooms engaged in mental health consultation professional development interventions.


Assuntos
Psicometria , Humanos , Feminino , Masculino , Pré-Escolar , Reprodutibilidade dos Testes , Inquéritos e Questionários , Análise Fatorial , Psicometria/métodos , Creches , Sudeste dos Estados Unidos , Meio Social
4.
Autism Res ; 16(8): 1586-1599, 2023 08.
Artigo em Inglês | MEDLINE | ID: mdl-37403878

RESUMO

Classroom engagement plays a crucial role in preschoolers' development, yet the correlates of engagement, especially among children with autism spectrum disorder (ASD) and developmental delays (DD), remains unknown. This study examines levels of engagement with classroom social partners and tasks among children in three groups ASD, DD, and typical development (TD). Here, we asked whether children's vocal interactions (vocalizations to and from peers and teachers) were associated with their classroom engagement with social partners (peers and teachers) and with tasks, and whether the association between classroom engagement and vocal interactions differed between children in the ASD group and their peers in the DD and TD groups. Automated measures of vocalizations and location quantified children's vocal interactions with peers and teachers over the course of the school year. Automated location and vocalization data were used to capture both (1) children's vocal output to specific peers and teachers, and (2) the vocal input they received from those peers and teachers. Participants were 72 3-5-year-olds (Mage = 48.6 months, SD = 7.0, 43% girls) and their teachers. Children in the ASD group displayed lower engagement with peers, teachers, and tasks than children in the TD group; they also showed lower engagement with peers than children in the DD group. Overall, children's own vocalizations were positively associated with engagement with social partners. Thus, although children in the ASD group tend to have lower engagement scores than children in the TD group, active participation in vocal interactions appears to support their classroom engagement with teachers and peers.


Assuntos
Transtorno do Espectro Autista , Criança , Feminino , Pré-Escolar , Humanos , Masculino , Transtorno do Espectro Autista/complicações , Instituições Acadêmicas , Grupo Associado , Escolaridade
5.
Contemp Clin Trials ; 124: 107022, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36442806

RESUMO

BACKGROUND: The COVID-19 pandemic has had negative psychosocial impacts on young children; teachers in childcare centers continue to be overwhelmed by how to address the downstream psychological effects children are experiencing. This randomized controlled trial will study the role of a community-based, childcare center-support system in improving resilience and mitigating the long-term impacts of COVID-19 on children's development. METHODS: This study will be modeled on a successful Early Childhood Mental Health Consultation (ECMHC) intervention which utilizes mental health consultants to deliver a Jump Start+: COVID 19 Support (JS + CS) virtual toolkit to childcare centers in Miami-Dade County via a Kubi robot. The toolkit comprises four strength-based strategies likely to be effective in improving resiliency following disasters: Safety Planning, Effective Communication, Adult Self-Care, and Trauma-Informed Behavior Support. Our first aim will utilize a cluster randomized trial to examine the effectiveness of JS + CS on improving the psychosocial functioning of young children, as compared to an obesity prevention intervention control group. Children will be followed at 6, 12, 18, and 24 months. The second aim will examine the mechanisms that contribute to effective uptake by teachers of the JS + CS support strategies on child outcomes. The third aim will explore implementation barriers/facilitators as well as potential societal contextual factors (e.g., vaccine uptake) to help centers serving disproportionately affected minority communities recover from and prepare for future crises. CONCLUSION: This design will inform the refinement and scaling of JS + CS and generalize impacts to other childcare center interventions in the context of disasters.


Assuntos
COVID-19 , Creches , Serviços de Saúde Mental , Telemedicina , Pré-Escolar , Humanos , COVID-19/epidemiologia , COVID-19/psicologia , Promoção da Saúde/métodos , Pandemias , Ensaios Clínicos Controlados Aleatórios como Assunto , Telemedicina/organização & administração , Serviços de Saúde Mental/organização & administração
6.
J Sch Psychol ; 84: 124-142, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33581767

RESUMO

The purpose of the study was to develop and validate a Spanish language form of the Adjustment Scales for Preschool Intervention (ASPI) for use by early childhood teachers. A multi-step, mixed method adaptation and translation process of the English form was used to increase the cultural relevance, linguistic comparability, and metric equivalence of the measure in its Spanish language form. Exploratory and confirmatory factor analyses in a diverse sample of preschool children from low-income families (N = 4077) revealed two higher order behavioral dimensions of Overactivity and Underactivity. ASPI dimension scores across Spanish and English language forms were horizontally equated through IRT. Criterion-related validity using multilevel models was established through concurrent associations with social, emotional, behavioral, and academic readiness skills. Policy and practice applications, and future directions for the use of scale scores are discussed.


Assuntos
Escala de Avaliação Comportamental , Comportamento Infantil/psicologia , Pré-Escolar/educação , Ajustamento Emocional , Hispânico ou Latino/educação , Ajustamento Social , Traduções , Intervenção Educacional Precoce , Análise Fatorial , Feminino , Humanos , Masculino , Pobreza , Psicometria/instrumentação , Reprodutibilidade dos Testes , Estados Unidos/etnologia
7.
Child Care Health Dev ; 46(6): 733-740, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32803796

RESUMO

BACKGROUND: Previous studies show a higher prevalence of obesity among preschool-age children with developmental disabilities (DDs) versus children who are typically developing (TD). Little is known about parent concerns about obesity in young children with DD. The purpose of this study was to examine concerns regarding paediatric obesity among parents who had a preschool-age child with DD compared with parents with a child who is TD. METHODS: A cross-sectional analysis occurred at baseline entry into one of three community-based programmes. Parents of a child with DD (n = 815) or TD (n = 563) were asked obesity-related questions about their child and in general. Multinomial and logistic regression unadjusted and adjusted models were run to generate the odds of obesity concerns based on disability status. RESULTS: The average child age was 38 months. Parent concerns about paediatric obesity differed by disability status. Unadjusted odds of parents 'doing anything to control their child's weight' was 38% lower among parents of a child with DD versus TD (OR: 0.62, 95% CI: 0.48, 0.82). The adjusted odds of perceiving that their child was underweight was 83% higher among parents of a child with DD compared with parents of a child who is TD (aOR: 1.83, 95% CI: 1.27, 2.64). Parents of a child with DD were 179% more likely to believe that childhood obesity is a public health problem (aOR: 2.79, 95% CI: 1.88, 3.96). The models were adjusted for age, sex and race/ethnicity. CONCLUSIONS: Findings indicate that parents of preschool-age children with DD are more likely to acknowledge that obesity is a public health concern. Because some parents of children with DD are concerned about their child's weight, families of preschool-age children with DD may be receptive to the delivery of healthy weight strategies in community-based programs.


Assuntos
Serviços de Saúde Comunitária , Deficiências do Desenvolvimento/complicações , Pais/psicologia , Obesidade Infantil/prevenção & controle , Adulto , Pré-Escolar , Estudos Transversais , Deficiências do Desenvolvimento/psicologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade Infantil/diagnóstico , Obesidade Infantil/epidemiologia , Inquéritos e Questionários , Adulto Jovem
8.
Int J Popul Data Sci ; 5(4): 1651, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-34746445

RESUMO

The COVID-19 pandemic made its mark on the entire world, upending economies, shifting work and education, and exposing deeply rooted inequities. A particularly vulnerable, yet less studied population includes our youngest children, ages zero to five, whose proximal and distal contexts have been exponentially affected with unknown impacts on health, education, and social-emotional well-being. Integrated administrative data systems could be important tools for understanding these impacts. This article has three aims to guide research on the impacts of COVID-19 for this critical population using integrated data systems (IDS). First, it presents a conceptual data model informed by developmental-ecological theory and epidemiological frameworks to study young children. This data model presents five developmental resilience pathways (i.e. early learning, safe and nurturing families, health, housing, and financial/employment) that include direct and indirect influencers related to COVID-19 impacts and the contexts and community supports that can affect outcomes. Second, the article outlines administrative datasets with relevant indicators that are commonly collected, could be integrated at the individual level, and include relevant linkages between children and families to facilitate research using the conceptual data model. Third, this paper provides specific considerations for research using the conceptual data model that acknowledge the highly-localised political response to COVID-19 in the US. It concludes with a call to action for the population data science community to use and expand IDS capacities to better understand the intermediate and long-term impacts of this pandemic on young children.

9.
Early Child Dev Care ; 190(14): 2278-2290, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33716381

RESUMO

The purpose of this study was to examine the relationship between language skills and behavioural problems and the potential moderating role of the quality of classroom emotional support in this relationship among 242 preschool children from low-income families. The Preschool Language Scale-5 was administered individually to each child. The quality of classroom emotional support was measured using the Emotional Support domain of the Classroom Assessment Scoring System for Pre-Kindergarten. Teachers and parents completed the Child Behaviour Checklist for Ages 1½-5. Results indicated the inverse relationship between language skills and behaviour problems varied by the level of classroom emotional support provided by teachers. Specifically, children with lower language skills exhibited higher levels of behaviour problems in classrooms where teachers provided lower levels of emotional support. Findings from this study have important implications for enhancing teachers' emotional support aimed at children with lower language skills and for future research.

10.
Multivariate Behav Res ; 52(2): 149-163, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-27925836

RESUMO

Hierarchical data are becoming increasingly complex, often involving more than two levels. Centering decisions in multilevel models are closely tied to substantive hypotheses and require researchers to be clear and cautious about their choices. This study investigated the implications of group mean centering (i.e., centering within context; CWC) and grand mean centering (CGM) of predictor variables in three-level contextual models. The goals were to (a) determine equivalencies in the means and variances across the centering options and (b) use the algebraic relationships between the centering choices to clarify the interpretation of the estimated parameters. We provide recommendations to assist the researcher in making centering decisions for analysis of three-level contextual models.


Assuntos
Modelos Lineares , Análise Multivariada , Algoritmos , Comportamento Infantil , Pré-Escolar , Interpretação Estatística de Dados , Tomada de Decisões , Intervenção Educacional Precoce , Feminino , Humanos , Masculino , Testes Psicológicos , Comportamento Social
11.
J Sch Psychol ; 50(6): 775-98, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23245500

RESUMO

Employing a developmental and ecological model, the study identified initial levels and rates of change in academic skills for subgroups of preschool children exhibiting problem behavior within routine classroom situations. Six distinct latent profile types of emotional and behavioral adjustment were identified for a cohort of low-income children early in the preschool year (N=4417). Profile types provided a descriptive picture of patterns of classroom externalizing, internalizing, and situational adjustment problems common to subgroups of children early in the preschool year. The largest profile type included children who exhibited low problem behavior and were characterized as well-adjusted to the preschool classroom early in the year. The other profile types were characterized by distinct combinations of elevated internalizing, externalizing, and situational problem behavior. Multinomial logistic regression identified younger children and boys at increased risk for classification in problem types, relative to the well-adjusted type. Latent growth models indicated that children classified within the extremely socially and academically disengaged profile type, started and ended the year with the lowest academic skills, relative to all other types. Implications for future research, policy, and practice are discussed.


Assuntos
Transtornos do Comportamento Infantil/diagnóstico , Comportamento Infantil/psicologia , Aprendizagem , Grupo Associado , Instituições Acadêmicas , Transtornos do Comportamento Infantil/psicologia , Pré-Escolar , Emoções , Docentes , Feminino , Humanos , Masculino , Pobreza , Ajustamento Social
12.
Eval Rev ; 35(3): 269-303, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21917712

RESUMO

Complex survey data are collected by means other than simple random samples. This creates two analytical issues: nonindependence and unequal selection probability. Failing to address these issues results in underestimated standard errors and biased parameter estimates. Using data from the nationally representative Head Start Family and Child Experiences Survey (FACES; 1997 and 2000 cohorts), three diverse multilevel models are presented that illustrate differences in results depending on addressing or ignoring the complex sampling issues. Limitations of using complex survey data are reported, along with recommendations for reporting complex sample results.


Assuntos
Coleta de Dados , Intervenção Educacional Precoce/estatística & dados numéricos , Família , Modelos Estatísticos , Estudos de Amostragem , Criança , Pré-Escolar , Humanos , Estados Unidos
13.
Eval Rev ; 35(3): 304-13, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21700621

RESUMO

Complex survey data, as highlighted in this issue of Evaluation Review, provide a wealth of opportunities for answering methodological and/or applied research questions. However, the analytic issues of nonindependence and unequal selection probability must be addressed when analyzing this type of data. Thus, to ensure that research questions are accurately answered when using complex survey data, researchers must take extra precautions to ensure complex survey data are correctly analyzed. The purpose of this article is to provide software recommendations for analysis of and tips on troubleshooting when analyzing complex sample data.


Assuntos
Coleta de Dados , Intervenção Educacional Precoce/estatística & dados numéricos , Modelos Estatísticos , Software , Criança , Pré-Escolar , Humanos , Estados Unidos
14.
J Sch Psychol ; 49(2): 175-95, 2011 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-21530763

RESUMO

Research suggests that promoting adaptive approaches to learning early in childhood may help close the gap between advantaged and disadvantaged children. Recent research has identified specific child-level and classroom-level variables that are significantly associated with preschoolers' approaches to learning. However, further research is needed to understand the interactive effects of these variables and determine whether classroom-level variables buffer the detrimental effects of child-level risk variables. Using a largely urban and minority sample (N=275) of preschool children, the present study examined the additive and interactive effects of children's context-specific problem behaviors and classroom process quality dimensions on children's approaches to learning. Teachers rated children's problem behavior and approaches to learning and independent assessors conducted classroom observations to assess process quality. Problem behaviors in structured learning situations and in peer and teacher interactions were found to negatively predict variance in approaches to learning. Classroom process quality domains did not independently predict variance in approaches to learning. Nonetheless, classroom process quality played an important role in these associations; high emotional support buffered the detrimental effects of problem behavior, whereas high instructional support exacerbated them. The findings of this study have important implications for classroom practices aimed at helping children who exhibit problem behaviors.


Assuntos
Aprendizagem , Grupo Associado , Meio Social , Ensino/métodos , Pré-Escolar , Feminino , Humanos , Relações Interpessoais , Masculino , Pobreza
15.
Proc Natl Acad Sci U S A ; 106(39): 16698-703, 2009 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-19706890

RESUMO

Human pluripotent stem cells have the potential to provide comprehensive model systems for the earliest stages of human ontogenesis. To serve in this capacity, these cells must undergo a targeted, stepwise differentiation process that follows a normal developmental timeline. Here we demonstrate the ability of both human embryonic stem cells (hESCs) and induced pluripotent stem (iPS) cells to meet these requirements for human retinogenesis. Upon differentiation, hESCs initially yielded a highly enriched population of early eye field cells. Thereafter, a subset of cells acquired features of advancing retinal differentiation in a sequence and time course that mimicked in vivo human retinal development. Application of this culture method to a human iPS cell line also generated retina-specific cell types at comparable times in vitro. Lastly, altering endogenous signaling during differentiation affected lineage-specific gene expression in a manner consistent with established mechanisms of early neural and retinal cell fate determination. These findings should aid in the investigation of the molecular events governing retinal specification from human pluripotent stem cells.


Assuntos
Células-Tronco Embrionárias/citologia , Células-Tronco Pluripotentes/citologia , Retina/crescimento & desenvolvimento , Diferenciação Celular , Células-Tronco Embrionárias/metabolismo , Humanos , Imuno-Histoquímica , Modelos Biológicos , Fenótipo , Células-Tronco Pluripotentes/metabolismo , Retina/embriologia
16.
Stem Cells ; 26(12): 3182-93, 2008 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18802035

RESUMO

During development of the central nervous system, stem and progenitor cell proliferation and differentiation are controlled by complex inter- and intracellular interactions that orchestrate the precise spatiotemporal production of particular cell types. Within the embryonic retina, progenitor cells are located adjacent to the retinal pigment epithelium (RPE), which differentiates prior to the neurosensory retina and has the capacity to secrete a multitude of growth factors. We found that secreted proteinaceous factors in human prenatal RPE conditioned medium (RPE CM) prolonged and enhanced the growth of human prenatal retinal neurospheres. The growth-promoting activity of RPE CM was mitogen-dependent and associated with an acute increase in transcription factor phosphorylation. Expanded populations of RPE CM-treated retinal neurospheres expressed numerous neurodevelopmental and eye specification genes and markers characteristic of neural and retinal progenitor cells, but gradually lost the potential to generate neurons upon differentiation. Misexpression of Mash1 restored the neurogenic potential of long-term cultures, yielding neurons with phenotypic characteristics of multiple inner retinal cell types. Thus, a novel combination of extrinsic and intrinsic factors was required to promote both progenitor cell proliferation and neuronal multipotency in human retinal neurosphere cultures. These results support a pro-proliferative and antiapoptotic role for RPE in human retinal development, reveal potential limitations of human retinal progenitor culture systems, and suggest a means for overcoming cell fate restriction in vitro.


Assuntos
Fatores de Transcrição Hélice-Alça-Hélice Básicos/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Neurônios/metabolismo , Epitélio Pigmentado da Retina/metabolismo , Apoptose , Diferenciação Celular , Linhagem da Célula , Proliferação de Células , Meios de Cultivo Condicionados/metabolismo , Humanos , Fenótipo , Fosforilação , Retina/citologia , Células-Tronco/citologia , Fatores de Transcrição/metabolismo
17.
Invest Ophthalmol Vis Sci ; 49(7): 3201-6, 2008 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18579765

RESUMO

PURPOSE: As a follow-up to previous studies showing that human cortical neural progenitor cells (hNPC(ctx)) can sustain vision for at least 70 days after injection into the subretinal space of Royal College of Surgeons (RCS) rats, the authors examined how functional rescue is preserved over long periods and how this relates to retinal integrity and donor cell survival. METHODS: Pigmented dystrophic RCS rats (n = 15) received unilateral subretinal injections of hNPC(ctx) at postnatal day (P) 21; control rats (n = 10) received medium alone and were untreated. All animals were maintained on oral cyclosporine A. Function was monitored serially by measuring acuity (using an optomotor test) and luminance thresholds (recording from the superior colliculus) at approximately P90, P150, and P280. Eyes were processed for histologic study after functional tests. RESULTS: Acuity and luminance thresholds were significantly better in hNPC(ctx)-treated animals than in controls (P < 0.001) at all time points studied. Acuity was greater than 90%, 82%, and 37% of normal at P90, P150, and P270, whereas luminance thresholds in the area of best rescue remained similar the whole time. Histologic studies revealed substantial photoreceptor rescue, even up to P280, despite progressive deterioration in rod and cone morphology. Donor cells were still present at P280, and no sign of donor cell overgrowth was seen. CONCLUSIONS: Long-term rescue of function and associated morphologic substrates was seen, together with donor cell survival even in the xenograft paradigm. This is encouraging when exploring further the potential for the application of hNPC(ctx) in treating retinal disease.


Assuntos
Neurônios/transplante , Células Fotorreceptoras de Vertebrados , Degeneração Retiniana/fisiopatologia , Degeneração Retiniana/cirurgia , Transplante de Células-Tronco , Transplante Heterólogo , Visão Ocular , Animais , Sobrevivência Celular , Humanos , Injeções , Luz , Células Fotorreceptoras de Vertebrados/patologia , Ratos , Células Fotorreceptoras Retinianas Cones/patologia , Degeneração Retiniana/patologia , Células Fotorreceptoras Retinianas Bastonetes/patologia , Limiar Sensorial , Transplante de Células-Tronco/métodos , Fatores de Tempo , Acuidade Visual
18.
Invest Ophthalmol Vis Sci ; 49(2): 788-99, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18235029

RESUMO

PURPOSE: Established techniques for culturing primary human retinal pigment epithelial (RPE) cells have facilitated the laboratory investigation of this multipurpose retinal cell layer. However, most culture methods involve the use of animal serum to establish and maintain RPE monolayers, which can complicate efforts to define and study factors involved in the maturation and function of these cells. Therefore, this study was conducted to develop a simple, serum-free system to propagate and sustain human RPE in vitro. METHODS: RPE was dissected from human prenatal donor eyes and cultured in serum-free defined medium containing the commercially formulated supplement B27 or N2. Cultures were grown initially as adherent tissue sections or suspended spherical aggregates and later expanded and maintained as monolayers. PCR, Western blot analysis, and immunocytochemistry were used to monitor gene and protein expression in established cultures, followed by examination of secretory products in RPE conditioned medium by ELISA and mass spectrometric analysis. RESULTS: In medium supplemented with B27, but not N2, RPE could be expanded up to 40,000-fold over six passages and maintained in culture for more than 1 year. In long-term cultures, typical cellular morphology and pigmentation were observed, along with expression of characteristic RPE markers. RPE monolayers also retained proper apical-basal orientation and secreted multiple factors implicated in the maintenance of photoreceptor health and the pathogenesis of age-related macular degeneration. CONCLUSIONS: Monolayer cultures of human prenatal RPE can be grown and maintained long term in the total absence of serum and still retain the phenotype, gene and protein expression profile, and secretory capacity exhibited by mature RPE cells.


Assuntos
Técnicas de Cultura de Células , Feto/citologia , Epitélio Pigmentado Ocular/citologia , Biomarcadores/metabolismo , Western Blotting , Polaridade Celular , Proliferação de Células , Meios de Cultura Livres de Soro , Eletroforese em Gel Bidimensional , Ensaio de Imunoadsorção Enzimática , Proteínas do Olho/biossíntese , Proteínas do Olho/genética , Técnica Indireta de Fluorescência para Anticorpo , Expressão Gênica , Idade Gestacional , Humanos , Espectrometria de Massas , Epitélio Pigmentado Ocular/metabolismo , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Junções Íntimas , Doadores de Tecidos
19.
Dev Psychol ; 44(1): 139-54, 2008 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18194013

RESUMO

This study used a developmental-ecological approach to investigate the relationship across the school year between early problems in preschool classroom situations and a comprehensive set of readiness competencies for urban low-income children. Study 1 identified 3 reliable and unique underlying classroom situational dimensions where behavior problems occurred: structured learning, peer interaction, and teacher interaction situations. Boys and younger children evidenced more problematic behavior across all situations. Study 2 investigated the relationship between early problems in the situations and readiness outcomes. Early situational difficulties uniquely and differentially predicted lower peer social and classroom learning outcomes. In combination, both the type of behavior problem (what) and the situational problem (where) explained greater variance in the prediction of readiness outcomes, contributing to a more comprehensive understanding of developmental trajectories.


Assuntos
Adaptação Psicológica , Transtornos do Comportamento Infantil/epidemiologia , Comportamento Infantil/psicologia , Intervenção Educacional Precoce , Emoções , Ajustamento Social , Fatores Etários , Transtornos do Comportamento Infantil/diagnóstico , Transtornos do Comportamento Infantil/psicologia , Pré-Escolar , Estudos de Coortes , Intervenção Educacional Precoce/estatística & dados numéricos , Feminino , Humanos , Relações Interpessoais , Masculino , Modelos Psicológicos , Grupo Associado , Pobreza , Prevalência , Escalas de Graduação Psiquiátrica/estatística & dados numéricos , Instituições Acadêmicas , Fatores Sexuais , Meio Social , Socialização , Estudantes/psicologia , População Urbana
20.
PLoS One ; 2(3): e338, 2007 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-17396165

RESUMO

BACKGROUND: A promising clinical application for stem and progenitor cell transplantation is in rescue therapy for degenerative diseases. This strategy seeks to preserve rather than restore host tissue function by taking advantage of unique properties often displayed by these versatile cells. In studies using different neurodegenerative disease models, transplanted human neural progenitor cells (hNPC) protected dying host neurons within both the brain and spinal cord. Based on these reports, we explored the potential of hNPC transplantation to rescue visual function in an animal model of retinal degeneration, the Royal College of Surgeons rat. METHODOLOGY/PRINCIPAL FINDINGS: Animals received unilateral subretinal injections of hNPC or medium alone at an age preceding major photoreceptor loss. Principal outcomes were quantified using electroretinography, visual acuity measurements and luminance threshold recordings from the superior colliculus. At 90-100 days postnatal, a time point when untreated rats exhibit little or no retinal or visual function, hNPC-treated eyes retained substantial retinal electrical activity and visual field with near-normal visual acuity. Functional efficacy was further enhanced when hNPC were genetically engineered to secrete glial cell line-derived neurotrophic factor. Histological examination at 150 days postnatal showed hNPC had formed a nearly continuous pigmented layer between the neural retina and retinal pigment epithelium, as well as distributed within the inner retina. A concomitant preservation of host cone photoreceptors was also observed. CONCLUSIONS/SIGNIFICANCE: Wild type and genetically modified human neural progenitor cells survive for prolonged periods, migrate extensively, secrete growth factors and rescue visual functions following subretinal transplantation in the Royal College of Surgeons rat. These results underscore the potential therapeutic utility of hNPC in the treatment of retinal degenerative diseases and suggest potential mechanisms underlying their effect in vivo.


Assuntos
Neurônios/fisiologia , Doenças Retinianas/fisiopatologia , Visão Ocular/fisiologia , Acuidade Visual , Animais , Encéfalo/fisiologia , Encéfalo/fisiopatologia , Modelos Animais de Doenças , Humanos , Ratos , Medula Espinal/fisiologia , Medula Espinal/fisiopatologia , Transplante de Células-Tronco
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