Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 18 de 18
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Am J Health Promot ; 38(1): 112-123, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37828763

RESUMO

OBJECTIVE: Faith leaders often serve as health-related role models yet many struggle with obesity and self-care engagement. The purpose of this scoping review was to examine how the faith leader literature has defined self-care and examined obesity and obesity-related chronic disease. DATA SOURCE: Studies were identified through database (eg, PubMed, CINAHL, PsycINFO), backward, and grey literature (eg, dissertations) searches. INCLUSION/EXCLUSION CRITERIA: Studies published in English with participants who were 18 years or older and examined leaders across all faiths. Studies also included an examination of self-care behaviors among faith leaders within the context of obesity or obesity-related chronic diseases. DATA EXTRACTION/SYNTHESIS: Data synthesis was qualitative and informed by the six-step framework developed by Arksey and O'Malley (2005) as well as updated recommendations by Daudt et al (2013). Of the 418 studies identified and screened, 20 met the eligibility criteria. RESULTS: Studies were primarily cross-sectional and participants Christian faith-leaders in the US. Most studies did not define self-care or incorporate theory, but focused on vegetarian diets and physical activity engagement. Other self-care related behaviors (eg, sleep, days off), some unique to faith leaders (eg, sabbatical), were included but not systematically. CONCLUSIONS: Research with more diverse faith leaders and that uses theory is needed to guide development of strategies for engaging this population in self-care to reduce obesity and related chronic diseases.


Assuntos
Obesidade , Autocuidado , Humanos , Estudos Transversais , Obesidade/terapia , Cristianismo , Doença Crônica
2.
J Relig Health ; 62(4): 2627-2637, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37097411

RESUMO

Fit with Faith is a 10-week, diet, physical activity, and stress reduction intervention for African-American clergy and spouses, which included: meetings, phone calls, a behavior tracking app. Survey, 24-h recall, accelerometer, anthropometric, and blood pressure data were collected. Wilcoxon signed ranked tests were used for analyses. In this one-arm study, clergy and spouses (n = 20) attended most meetings and calls, but only half posted daily goals or tracked behaviors using the app. Spouses' body mass index (BMI) decreased and physical activity self-regulation cognitive scores increased pre-post intervention. Statistically significant changes in BMI, systolic blood pressure, and self-regulations scores also were seen among younger (< 51 years) participants (n = 8). As positive changes were seen mostly among women and younger participants, more research is needed on how to engage all clergy in behavior change programs.


Assuntos
Negro ou Afro-Americano , Clero , Comportamentos Relacionados com a Saúde , Cônjuges , Feminino , Humanos , Exercício Físico , Masculino , Pessoa de Meia-Idade , Estresse Psicológico/terapia , Dieta Saudável
3.
Am J Health Behav ; 45(1): 71-80, 2021 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-33402239

RESUMO

Objective: The aim of this study was to identify the effects of menopausal and body composition statuses on measures of total and regional body composition and dyslipidemia in women. Methods: Sedentary, non-smoking women (N = 212), not currently treated for dyslipidemia were grouped based on 2 categories: (1) menstrual status: premenopausal or postmenopausal and (2) body composition status: normal weight (NW; BMI < 25 kg/m² and body fat (BF) < 36%), normal weight obese (NWO; BMI < 25 kg/m² and BF > 36%), or obese (BMI > 25 kg/m² and BF > 36%), to determine differences in total and regional body composition and measures of lipid and lipoprotein-cholesterol concentrations. Results: Overall, a greater prevalence of NWO was observed in postmenopausal versus premenopausal women. Being postmenopausal was associated with higher TC, LDL-C, non-HDL-C, HDL-C, and HDL3-C. Premenopausal NWO women had elevated LDL-C and VLDL-C comparable to obese women. Postmenopausal NWO women had elevated Tg and VLDL-C and lower HDL-C similar to obese women. Conclusions: Menopausal status was not associated with differences in fat distribution, however, the age-related differences in lipids and lipoproteins appear to be due to a difference in menopausal status exacerbated in women who are NWO.


Assuntos
Composição Corporal , Dislipidemias , Menopausa , Índice de Massa Corporal , Colesterol/sangue , Dislipidemias/epidemiologia , Feminino , Humanos , Obesidade/epidemiologia , Sobrepeso/epidemiologia , Triglicerídeos/sangue
4.
Am J Health Promot ; 35(3): 399-408, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-32985232

RESUMO

PURPOSE: Clergy have influence on the health of congregations and communities yet struggle with health behaviors. Interventions tailored to their occupation-specific demands and unique needs may provide a solution. Qualitative methods were used to identify opportunities and resources for the development of an effective obesity-related program for clergy. APPROACH: Ninety-minute focus groups were held with clergy (3 groups) and spouses (3 separate groups). Discussion explored: Program target(s); Opportunities and barriers that influence diet, physical activity, and stress-reduction practices; Empowering and culturally relevant health promotion strategies. SETTING: All study activities took place in Memphis, TN. PARTICIPANTS: Eighteen clergy and fourteen spouses participated. All clergy were male, all spouses were female. METHOD: Previous research with clergy informed the interview guide and the PEN-3 framework aided in organizing the coding of clergy and spouse focus groups. Focus groups were audio recorded and transcripts analyzed using NVivo® 12. RESULTS: Themes included: 1) Intervention targets-clergy, spouses, congregations; 2) Opportunities and barriers-making time, establishing boundaries, church traditions, individuals who support and hinder behavior change; 3) Intervention strategies-tools for healthy eating, goal setting, camaraderie, combining face-to-face with eHealth modalities. CONCLUSION: The relationship between clergy, spouse, and congregation make it important for obesity-related programs to target the unique needs of both clergy and spouses. Strategies should focus on healthy eating and personal connections no matter the modality used.


Assuntos
Clero , Cônjuges , Feminino , Grupos Focais , Promoção da Saúde , Humanos , Masculino , Obesidade/prevenção & controle
5.
J Relig Health ; 59(4): 2110-2119, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31848799

RESUMO

The purpose of this study was to describe practices and perceptions related to promoting clergy health among a national sample of denomination-level faith-based organizations (FBOs) (N = 154). Stress was identified as the top health-related issue facing clergy. The most commonly offered health resource was employer-sponsored health insurance. Lack of financial resources was the most common barrier to providing health resources for clergy. This study highlights potential priorities for denomination-level FBOs interested in providing health resources for clergy.


Assuntos
Clero , Organizações Religiosas , Recursos em Saúde , Clero/estatística & dados numéricos , Organizações Religiosas/estatística & dados numéricos , Promoção da Saúde/estatística & dados numéricos , Recursos em Saúde/estatística & dados numéricos , Humanos , Estados Unidos
6.
J Relig Health ; 58(2): 391-407, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30377906

RESUMO

Large denominational faith-based organizations (FBOs, e.g., conferences, dioceses) have potential to impact population health, though current activities are largely unknown. This study examined how large denominational FBOs approach health promotion programming and relevant barriers and issues related to capacity. A self-report survey via email and mail collected responses from representatives of FBOs about their health programming. The sample (n = 154) was diverse and included Catholic, Presbyterian, and Lutheran traditions. The most common activities were inclusion of health-related topics at organizational events and the provision of educational resources. Working with FBOs at a macro-level has potential implications for population-level health improvements.


Assuntos
Organizações Religiosas , Promoção da Saúde , Catolicismo , Humanos , Protestantismo , Inquéritos e Questionários
7.
J Relig Health ; 57(4): 1509-1523, 2018 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-29388002

RESUMO

Religious leaders, particularly African-American pastors, are believed to play a key role in addressing health disparities. Despite the role African-American pastors may play in improving health, there is limited research on pastoral influence. The purpose of this study was to examine African-American pastors' perceptions of their influence in their churches and communities. In-depth interviews were conducted with 30 African-American pastors and analyzed using a grounded theory approach. Three themes emerged: the historical role of the church; influence as contextual, with pastors using comparisons with other pastors to describe their ability to be influential; and a reciprocal relationship existing such that pastors are influenced by factors such as God and their community while these factors also aid them in influencing others. A conceptual model of pastoral influence was created using data from this study and others to highlight factors that influence pastors, potential outcomes and moderators as well as the reciprocal nature of pastoral influence.


Assuntos
Negro ou Afro-Americano , Clero/psicologia , Criança , Feminino , Humanos , Masculino , Pesquisa Qualitativa , South Carolina , Estados Unidos
8.
ACS Infect Dis ; 3(7): 479-491, 2017 07 14.
Artigo em Inglês | MEDLINE | ID: mdl-28591513

RESUMO

Preventing the spread of infectious diseases remains an urgent priority worldwide, and this is driving the development of advanced nanotechnology to diagnose infections at the point of care. Herein, we report the creation of a library of novel nanobody capture ligands to detect p24, one of the earliest markers of HIV infection. We demonstrate that these nanobodies, one tenth the size of conventional antibodies, exhibit high sensitivity and broad specificity to global HIV-1 subtypes. Biophysical characterization indicates strong 690 pM binding constants and fast kinetic on-rates, 1 to 2 orders of magnitude better than monoclonal antibody comparators. A crystal structure of the lead nanobody and p24 was obtained and used alongside molecular dynamics simulations to elucidate the molecular basis of these enhanced performance characteristics. They indicate that binding occurs at C-terminal helices 10 and 11 of p24, a negatively charged region of p24 complemented by the positive surface of the nanobody binding interface involving CDR1, CDR2, and CDR3 loops. Our findings have broad implications on the design of novel antibodies and a wide range of advanced biomedical applications.


Assuntos
Anticorpos Monoclonais/química , Anticorpos Anti-HIV/química , Proteína do Núcleo p24 do HIV/química , HIV-1/química , Anticorpos de Domínio Único/química , Sequência de Aminoácidos , Animais , Anticorpos Monoclonais/biossíntese , Anticorpos Monoclonais/imunologia , Anticorpos Monoclonais/isolamento & purificação , Especificidade de Anticorpos , Sítios de Ligação , Camelídeos Americanos , Clonagem Molecular , Cristalografia por Raios X , Escherichia coli/genética , Escherichia coli/metabolismo , Expressão Gênica , Anticorpos Anti-HIV/biossíntese , Anticorpos Anti-HIV/imunologia , Anticorpos Anti-HIV/isolamento & purificação , Proteína do Núcleo p24 do HIV/genética , Proteína do Núcleo p24 do HIV/imunologia , Humanos , Cinética , Simulação de Dinâmica Molecular , Biblioteca de Peptídeos , Plasmídeos/química , Plasmídeos/metabolismo , Ligação Proteica , Conformação Proteica em alfa-Hélice , Conformação Proteica em Folha beta , Domínios e Motivos de Interação entre Proteínas , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Proteínas Recombinantes/imunologia , Anticorpos de Domínio Único/biossíntese , Anticorpos de Domínio Único/imunologia , Anticorpos de Domínio Único/isolamento & purificação , Eletricidade Estática
9.
J Relig Health ; 56(2): 561-574, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27178321

RESUMO

Clergy are disproportionately affected by obesity and chronic disease. Physical activity (PA) offers a viable option for addressing the health of clergy. The purpose of this study was to evaluate the effectiveness of a culturally tailored PA program for clergy. Clergy (N = 44) were randomly assigned to an intervention group or wait-list control group. Baseline and follow-up measures included PA behavior and psychosocial measures. Analyses revealed a significant effect of the intervention on sedentary behavior, PA behavior, self-efficacy for PA, and outcome expectations for PA. Culturally tailored PA programs could potentially influence PA behavior and psychosocial mediators of PA among clergy.


Assuntos
Doença Crônica/prevenção & controle , Clero/estatística & dados numéricos , Promoção da Saúde/métodos , Obesidade/prevenção & controle , Avaliação de Programas e Projetos de Saúde/estatística & dados numéricos , Caminhada/estatística & dados numéricos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Autoeficácia
10.
J Relig Health ; 54(5): 1747-59, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25119627

RESUMO

This qualitative study explored the influence of faith leaders on health-related issues within their congregation. Semi-structured interviewers with 24 faith leaders found that chronic conditions and poor health behaviors were the top health challenges facing their congregation. A majority mentioned health-related activities taking place at their church. Most believed they had influence on their congregation for issues related to health/wellness, most commonly in the form of increasing awareness. A majority talked about the importance of being a role model. It is important to understand how to most effectively capitalize on the strengths of and engage pastors in health promotion efforts.


Assuntos
Clero/psicologia , Promoção da Saúde/métodos , Papel Profissional/psicologia , Religião , Clero/estatística & dados numéricos , Feminino , Promoção da Saúde/estatística & dados numéricos , Humanos , Entrevistas como Assunto , Liderança , Masculino , Pessoa de Meia-Idade , Pesquisa Qualitativa
11.
Fam Community Health ; 36(3): 182-92, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23718954

RESUMO

Faith-based organizations are a frequent partner in health promotion due to their large and expansive reach across multiple demographics of the United States. These faith-based organizations are led by clergy members who have a strong influence over their institutions and who shape the physical and social environments of their institutions for health-related matters. The purpose of this review was to examine current issues associated with the health, behaviors, and well-being of clergy, highlight the literature on the role clergy play in delivering effective health promotion interventions, and present recommendations for improving clergy health and the involvement of clergy in faith-based initiatives.


Assuntos
Clero , Promoção da Saúde , Nível de Saúde , Religião , Comportamentos Relacionados com a Saúde , Humanos , Liderança , Estados Unidos
12.
AIDS ; 23(17): 2255-63, 2009 Nov 13.
Artigo em Inglês | MEDLINE | ID: mdl-19741482

RESUMO

OBJECTIVE: The cellular innate immune response to HIV-1 is poorly characterized. In view of HIV-1 tropism for macrophages, which can be activated via pattern recognition receptors to trigger antimicrobial defences, we investigated innate immune responses to HIV-1 by monocyte-derived macrophages. DESIGN: In a model of productive HIV-1 infection, cellular innate immune responses to HIV-1 were investigated, at the level of transcription factor activation, specific gene expression and genome-wide transcriptional profiling. In addition, the viral determinants of macrophage responses and the physiological effect of innate immune cellular activation on HIV-1 replication were assessed. RESULTS: Productive HIV-1 infection did not activate nuclear factor-kappaB and interferon regulatory factor 3 transcription factors or interferon gene expression (IFN) and caused remarkably small changes to the host-cell transcriptome, with no evidence of inflammatory or IFN signatures. Evasion of IFN induction was not dependent on HIV-1 envelope-mediated cellular entry, inhibition by accessory proteins or reverse transcription of ssRNA that may reduce innate immune cellular activation by viral RNA. Furthermore, IFNbeta priming did not sensitize responses to HIV-1. Importantly, exogenous IFNbeta or stimulation with the RNA analogue poly I:C to simulate innate immune activation invoked HIV-1 restriction. CONCLUSION: We conclude that macrophages lack functional pattern recognition receptors for this virus and that HIV-1 tropism for macrophages helps to establish a foothold in the host without triggering innate immune cellular activation, which would otherwise block viral infection effectively.


Assuntos
Infecções por HIV/imunologia , HIV-1/fisiologia , Imunidade Inata/imunologia , Macrófagos/virologia , Replicação Viral/imunologia , Células Cultivadas , Regulação Viral da Expressão Gênica , Infecções por HIV/genética , Infecções por HIV/virologia , Humanos , Evasão da Resposta Imune/imunologia , Imunidade Celular/imunologia , Imunidade Inata/genética , Ativação de Macrófagos/genética , Ativação de Macrófagos/imunologia , Macrófagos/imunologia , NF-kappa B/metabolismo , Transdução de Sinais/genética , Transdução de Sinais/imunologia , Tropismo Viral , Replicação Viral/genética
13.
J Gen Virol ; 90(Pt 3): 702-709, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19218217

RESUMO

The potential risk of cross-species transmission of porcine endogenous retroviruses (PERV) to humans has slowed the development of xenotransplantation, using pigs as organ donors. Here, we show that PERVs are insensitive to restriction by divergent TRIM5alpha molecules despite the fact that they strongly restrict a variety of divergent lentiviruses. We also show that the human PERV A/C recombinant clone 14/220 reverse transcribes with increased efficiency in human cells, leading to significantly higher infectivity. We conclude that xenotransplantation studies should consider the danger of highly infectious TRIM5alpha-insensitive human-tropic PERV recombinants.


Assuntos
Proteínas de Transporte/farmacologia , Suínos/virologia , Sequência de Aminoácidos , Animais , Fatores de Restrição Antivirais , Capsídeo/química , Capsídeo/metabolismo , Proteínas de Transporte/genética , Proteínas de Transporte/metabolismo , Bovinos , Linhagem Celular , Retrovirus Endógenos/classificação , Retrovirus Endógenos/efeitos dos fármacos , Retrovirus Endógenos/genética , Retrovirus Endógenos/metabolismo , Retrovirus Endógenos/fisiologia , Humanos , Dados de Sequência Molecular , Proteínas/genética , Proteínas/metabolismo , Proteínas/farmacologia , Coelhos , Recombinação Genética , Transcrição Reversa , Transplante Heterólogo , Proteínas com Motivo Tripartido , Ubiquitina-Proteína Ligases
14.
J Virol ; 82(14): 7243-7, 2008 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18480454

RESUMO

TRIM5alpha is a potent barrier to cross-species retroviral transmission, and TRIM5alphas from different species have divergent antiretroviral specificities. Multiple TRIM5 alleles circulate within rhesus macaque populations. Here we show that they too have different antiretroviral specificities, highlighting how TRIM5 genotypes contribute to protection in an individual or a population.


Assuntos
Macaca mulatta/genética , Macaca mulatta/imunologia , Polimorfismo Genético , Proteínas/genética , Proteínas/imunologia , Alelos , Animais , Ubiquitina-Proteína Ligases
15.
Proc Natl Acad Sci U S A ; 105(9): 3557-62, 2008 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-18287035

RESUMO

The antiretroviral restriction factor TRIM5 has recently emerged as an important mediator of innate immunity and species-specific inhibition of retroviral replication in mammals. Selection pressure from pathogenic infection has driven rapid evolution of TRIM5 genes, leading to the antiviral specificities we see today. Remarkably, the New World owl monkey (Aotus trivirgatus) encodes a TRIM5 protein in which the antiviral determinants in the B30.2 domain have been replaced by cyclophilin A (CypA) encoded by a retrotransposed cDNA. The owl monkey TRIMCyp protein restricts infection by a subset of lentiviruses that recruit CypA to their capsids, including HIV-1 and feline immunodeficiency virus. Here, we show that the Old World monkey, rhesus macaque (Macaca mulatta), also encodes a TRIMCyp protein that has arisen independently from that in owl monkeys. The rhesus TRIMCyp is encoded by a single, but common, allele (Mamu7) of the rhesus TRIM5 gene, among at least six further alleles that encode full-length TRIM5 proteins with no homology to CypA. The antiviral specificity of the rhesus TRIMCyp is distinct, restricting infection of HIV-2 and feline immunodeficiency virus but not HIV-1. Restriction by rhesus TRIMCyp is before reverse transcription and inhibited by blocking CypA binding, with cyclosporine A, or by mutation of the capsid CypA binding site. These observations suggest a mechanism of restriction that is conserved between TRIMCyp proteins. The lack of activity against HIV-1 suggests that Mamu7 homozygous animals will be null for TRIM5-mediated restriction of HIV-1 and could contribute to improved animal models for HIV/AIDS.


Assuntos
Ciclofilina A/genética , Evolução Molecular , Proteínas Mutantes Quiméricas/genética , Proteínas/genética , Retroviridae/imunologia , Animais , Gatos , Ciclofilina A/imunologia , HIV-1/imunologia , HIV-2/imunologia , Humanos , Vírus da Imunodeficiência Felina/imunologia , Macaca mulatta , Dados de Sequência Molecular , Proteínas Mutantes Quiméricas/imunologia , Proteínas/imunologia , Proteínas Recombinantes de Fusão , Recombinação Genética , Especificidade da Espécie , Ubiquitina-Proteína Ligases
16.
J Virol ; 81(24): 13578-86, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17928342

RESUMO

Reactivation of lytic replication from viral latency is a defining property of all herpesviruses. Despite this, the authentic physiological cues for the latent-lytic switch are unclear. Such cues should ensure that viral lytic replication occurs under physiological conditions, predominantly in sites which facilitate transmission to permissive uninfected cells and new susceptible hosts. Kaposi's sarcoma-associated herpesvirus (KSHV) is associated with the B-cell neoplasm primary effusion lymphoma (PEL), in which the virus remains latent. We have previously shown that PEL cells have the gene expression profile and immunophenotype of cycling preplasma cells (plasmablasts). Here, we show that the highly active spliced isoform of plasma cell transcription factor X box binding protein 1 (XBP-1s) is a lytic switch for KSHV. XBP-1s is normally absent in PEL, but the induction of endoplasmic reticulum stress leads to XBP-1s generation, plasma cell-like differentiation, and lytic reactivation of KSHV. XBP-1s binds to and activates the KSHV immediate-early gene ORF50 and synergizes with the ORF50 gene product RTA to induce a full lytic cycle. These data suggest that KSHV remains latent until B-cell terminal differentiation into plasma cells, the transcriptional environment of which provides the physiological "lytic switch" through XBP-1s. This links B-cell terminal differentiation to KSHV lytic reactivation.


Assuntos
Proteínas de Ligação a DNA/metabolismo , Herpesvirus Humano 8/fisiologia , Proteínas Imediatamente Precoces/metabolismo , Proteínas Nucleares/metabolismo , Plasmócitos/citologia , Regiões Promotoras Genéticas , Transativadores/metabolismo , Ativação Transcricional , Proteínas Virais/metabolismo , Ativação Viral , Animais , Diferenciação Celular , Linhagem Celular , Chlorocebus aethiops , Proteínas de Ligação a DNA/genética , Retículo Endoplasmático/ultraestrutura , Regulação Viral da Expressão Gênica , Herpesvirus Humano 8/genética , Herpesvirus Humano 8/metabolismo , Humanos , Proteínas Imediatamente Precoces/genética , Microscopia Confocal , Dados de Sequência Molecular , Proteínas Nucleares/genética , Análise de Sequência com Séries de Oligonucleotídeos , Fatores de Transcrição de Fator Regulador X , Transativadores/genética , Fatores de Transcrição , Células Vero , Proteínas Virais/genética , Latência Viral , Replicação Viral , Proteína 1 de Ligação a X-Box
17.
J Virol ; 81(18): 10055-63, 2007 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17609268

RESUMO

TRIM5alpha is a potent intracellular antiviral restriction factor governing species-specific retroviral replication. In the New World species owl monkey the coding region for the viral binding B30.2 domain of TRIM5alpha has been replaced by a cyclophilin A (CypA) pseudogene by retrotransposition. The resultant TRIM5-CypA fusion protein restricts human immunodeficiency virus type 1 (HIV-1), as well as feline immunodeficiency virus (FIV), by recruitment of the CypA domain to the incoming viral capsids. Infectivity is rescued by agents such as cyclosporine that disrupt CypA binding to its substrates. Mice encode an antiviral restriction factor called Fv1 (for Friend virus susceptibility gene 1), which is active against murine leukemia virus and related to endogenous gag sequences. Here we show that fusing CypA to Fv1 generates a restriction factor with the antiviral specificity of TRIMCyp but the antiviral properties of Fv1. Like TRIMCyp, Fv1-Cyp restricts HIV-1 and FIV and is sensitive to inhibition by cyclosporine. TRIM5alpha is known to have a short half-life and block infectivity before viral reverse transcription. We show that Fv1-Cyp has a long half-life and blocks after reverse transcription, suggesting that its longer half-life gives the restricted virus the opportunity to synthesize DNA, leading to a later block to infection. This notion is supported by the observation that infectivity of Fv1-Cyp restricted virus can be rescued by cyclosporine for several hours after infection, whereas virus restricted by TRIMCyp is terminally restricted after around 40 min. Intriguingly, the Fv1-Cyp-restricted HIV-1 generates closed circular viral DNA, suggesting that the restricted virus complex enters the nucleus.


Assuntos
Ciclofilina A/metabolismo , HIV-1/metabolismo , Imunidade Inata , Vírus da Imunodeficiência Felina/metabolismo , Proteínas/metabolismo , Proteínas Recombinantes de Fusão/metabolismo , Animais , Aotidae , Capsídeo/imunologia , Capsídeo/metabolismo , Gatos , Linhagem Celular , Ciclofilina A/genética , Ciclofilina A/imunologia , DNA Viral/biossíntese , DNA Viral/genética , DNA Viral/imunologia , HIV-1/imunologia , Humanos , Imunidade Inata/genética , Vírus da Imunodeficiência Felina/imunologia , Camundongos , Proteínas/genética , Proteínas/imunologia , Proteínas Recombinantes de Fusão/genética , Proteínas Recombinantes de Fusão/imunologia , Transcrição Reversa/genética , Transcrição Reversa/imunologia , Internalização do Vírus
18.
J Virol ; 80(15): 7332-8, 2006 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-16840314

RESUMO

Lv1/TRIM5alpha (tripartite motif 5alpha) has recently emerged as an important factor influencing species-specific permissivity to retroviral infection in a range of primates, including humans. Old World monkey TRIM5alpha blocks human immunodeficiency virus type 1 (HIV-1) infectivity, and the human and New World monkey TRIM5alpha proteins are inactive against HIV-1 but active against divergent murine (N-tropic murine leukemia virus [MLV-N]) and simian (simian immunodeficiency virus from rhesus macaque [SIVmac]) retroviruses, respectively. Here we demonstrate antiviral activity of the first nonprimate TRIM protein, from cattle, active against divergent retroviruses, including HIV-1. The number of closely related human TRIM sequences makes assignment of the bovine sequence as a TRIM5alpha ortholog uncertain, and we therefore refer to it as bovine Lv1. Bovine Lv1 is closely related to primate TRIM5alpha proteins in the N-terminal RING and B-box 2 domains but significantly less homologous in the C-terminal B30.2 domain, particularly in the region shown to influence antiviral specificity. Intriguingly, some viruses restricted by bovine Lv1, including HIV-1 and MLV-N, are unable to synthesize viral DNA by reverse transcription, whereas restricted HIV-2 makes normal amounts of DNA. The data support the conclusion that TRIM protein-mediated restriction of retroviral infection is a more common attribute of mammals than previously appreciated.


Assuntos
Antirretrovirais/metabolismo , Proteínas de Transporte/genética , Infecções por Retroviridae/prevenção & controle , Retroviridae/fisiologia , Sequência de Aminoácidos , Animais , Antirretrovirais/isolamento & purificação , Fatores de Restrição Antivirais , Proteínas de Transporte/metabolismo , Bovinos , Linhagem Celular , Clonagem Molecular , DNA Viral/isolamento & purificação , HIV-1/fisiologia , Humanos , Imunidade Inata , Rim/citologia , Dados de Sequência Molecular , Platirrinos , Proteínas/genética , Proteínas/metabolismo , RNA Interferente Pequeno/genética , RNA Interferente Pequeno/metabolismo , RNA Viral/metabolismo , Infecções por Retroviridae/imunologia , Homologia de Sequência de Aminoácidos , Vírus da Imunodeficiência Símia/fisiologia , Proteínas com Motivo Tripartido , Ubiquitina-Proteína Ligases
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...