Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 85
Filtrar
Mais filtros

País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
Dev Med Child Neurol ; 65(3): 346-357, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-37017185

RESUMO

AIM: This study aimed to identify early clinical biomarkers from birth to 16 weeks corrected age to predict typical outcome and developmental delay in infants born very preterm or with very low birthweight. METHOD: A prospective cohort of infants on the Sunshine Coast, Australia, was assessed using the Premie-Neuro Examination, the General Movement Assessment (GMA), the Alberta Infant Motor Scale, and the Infant Sensory Profile 2. At 24 months corrected age, delay was identified using the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III) and Neurosensory Motor Developmental Assessment (NSMDA). RESULTS: One hundred and four infants were recruited; 79 completed outcome assessments (43 females, 36 males; mean gestational age 30 weeks [SD 1 week 6 days], mean birthweight 1346 g [SD 323]). The incidence of developmental delay (motor or cognitive) was 6.3%. Suboptimal quality of fidgety general movements (temporal organization) at 16 weeks corrected age demonstrated the best predictive accuracy (Bayley-III motor: sensitivity 100% [95% confidence interval {CI} 3-100], specificity 75% [95% CI 63-84], area under the curve [AUC] 0.87); Bayley-III cognitive: sensitivity 100% [95% CI 3-100], specificity 75% [95% CI 64-84], AUC 0.88); NSMDA motor: sensitivity 100% [95% CI 40-100], specificity 81% [95% CI 70-90], AUC 0.91 [95% CI 0.86-0.95]). GMA trajectories that combined abnormal writhing general movements at 4 to 5 weeks corrected age with suboptimal quality of fidgety movement at 16 weeks corrected age were strongly predictive of developmental delay, superior to all other clinical tools, and perinatal and demographic variables investigated (p = 0.01, Akaike information criterion method 18.79 [score corrected for small sample size], accounting for 93% of the cumulative weight). INTERPRETATION: Only the GMA had sufficient predictive validity to act as a biomarker for both conditions: typical outcome and developmental delay (motor or cognitive). GMA trajectories that assessed both writhing general movements at 4 to 5 weeks corrected age and quality of fidgety movement at 16 weeks corrected age predicted adverse neurodevelopmental outcome, accurately differentiating between infants with typical outcomes and those at increased risk for motor or cognitive delay.


Assuntos
Deficiências do Desenvolvimento , Lactente Extremamente Prematuro , Recém-Nascido , Masculino , Feminino , Gravidez , Criança , Lactente , Humanos , Deficiências do Desenvolvimento/diagnóstico , Desenvolvimento Infantil , Estudos Prospectivos , Recém-Nascido de muito Baixo Peso
2.
Biol Reprod ; 88(3): 66, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23303681

RESUMO

TGFBR3 (betaglycan), a TGFbeta superfamily coreceptor, is essential for normal seminiferous cord and Leydig cell development in the fetal mouse testis and has been associated with testicular dysgenesis syndrome in men. However, the mechanisms underlying TGFBR3-regulated testis development are unclear. We tested the hypothesis that loss of Tgfbr3 compromises the functions of TGFbeta2 in the differentiating fetal testis. Analysis of expression of transcripts encoding the TGFbeta superfamily members showed a predominance of TGFbeta mRNAs during the critical window of development when testis structure is established (11.5-14.5 days postcoitum [dpc]). When cultured under basal conditions for 2 days, explants of 13.5 dpc wild-type fetal testis/mesonephros complexes exhibited structure and gene expression profiles resembling those observed in vivo between 13.5-15.5 dpc. Similarly, development of Tgfbr3 knockout testis explants recapitulated the dysgenesis and decreased somatic cell marker expression previously observed in vivo. TGFbeta2 treatment partially rescued cord development in 11.5-13.5 dpc Tgfbr3 knockout explants but did not significantly alter somatic or germ cell gene expression. In contrast, TGFbeta2 treatment of wild-type explants disrupted cord structure and significantly downregulated the somatic and steroidogenic cell markers Amh, Sf1, Star, Cyp11a, Hsd3b1, and Cyp17a1. We conclude that 1) the compromised cord development in Tgfbr3 null fetal testis is due to, at least in part, disrupted TGFbeta2 function; 2) the reduction in steroidogenesis observed in the Tgfbr3 null testis may be regulated by additional TGFBR3 ligands, rather than TGFbeta2; and 3) both cord maintenance and somatic cell development are highly sensitive to the levels of TGFbeta2.


Assuntos
Proteoglicanas/metabolismo , Receptores de Fatores de Crescimento Transformadores beta/metabolismo , Testículo/embriologia , Fator de Crescimento Transformador beta2/metabolismo , Animais , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Família Multigênica , Testículo/metabolismo
3.
J Liver Cancer ; 23(1): 219-224, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37384033

RESUMO

Hepatoblastoma is an exceptionally rare malignancy in adults with just over 70 non-pediatric cases reported in literature. Recounted is a case of a 49-year-old female who presented with acute right upper quadrant abdominal pain, elevated serum alpha fetoprotein and a large liver mass on imaging. Hepatectomy was performed under clinical suspicion of hepatocellular carcinoma. Immunomorphologic characteristics of the tumor proved consistent with hepatoblastoma of mixed epithelial and mesenchymal type. Hepatocellular carcinoma remains to be the primary differential diagnosis for adult hepatoblastoma, however, distinguishing between these two neoplasms requires close histomorphologic assessment and immunohistochemical profiling as clinical, radiologic and gross pathologic findings typically overlap. Making this distinction is highly crucial in the timely initiation of surgical and chemotherapeutic interventions for this inherently aggressive and rapidly fatal disease.

4.
Pain Pract ; 11(6): 552-63, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21518246

RESUMO

Although previous studies suggest that the clinical setting of an interdisciplinary pain treatment program may provide an optimal environment to promote smoking cessation, currently available smoking cessation interventions may be less effective for adults with chronic pain due, in part, to unrecognized clinical factors related to chronic pain. The specific aim of this qualitative study was to solicit information from adult smokers with chronic pain participating in an interdisciplinary pain treatment program regarding their perceptions of how smoking affects pain symptoms, and how these beliefs, cognitions, and emotions may either impede or facilitate smoking cessation. Similar information was solicited from a group of pain specialty physicians. The study involved 18 smokers with chronic pain, and seven physicians. Patients reported that smoking was an important coping strategy for pain and distress, primarily by offering an opportunity for distraction and avoidance, respectively. The majority of patients using opioids reported that opioid consumption stimulated smoking. Important barriers were identified toward making a quit attempt during pain treatment including quitting smoking while making changes in opioid use, and perceived difficulty managing multiple treatment-related stressors. Several pain-related benefits of smoking cessation were identified by physicians, but important barriers to providing smoking cessation services were recognized including lack of time and knowledge about how to help patients quit smoking. The findings of this study identified several novel and important clinical factors that should be incorporated into a targeted smoking cessation intervention for adults with chronic pain.


Assuntos
Atitude do Pessoal de Saúde , Dor Crônica/psicologia , Dor Crônica/terapia , Médicos/psicologia , Abandono do Hábito de Fumar , Fumar/terapia , Adulto , Dor Crônica/epidemiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fumar/epidemiologia , Abandono do Hábito de Fumar/métodos , Abandono do Hábito de Fumar/psicologia
5.
Biol Reprod ; 82(1): 153-62, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19696014

RESUMO

Betaglycan (Tgfbr3) is a coreceptor for transforming growth factor-beta (TGFB) superfamily ligands. In the current study, a defect in seminiferous cord formation was detected in 12.5-13.5 days postcoitum (dpc) beta glycan null murine testis. Immunohistochemistry with antibodies against cell-specific markers revealed defects in somatic cell populations. To confirm these data, quantitative real-time PCR was performed to determine changes in the expression levels of genes involved in fetal testis cell differentiation and function. The expression levels of the Leydig cell markers Insl3, Cyp17a1, Cyp11a1, Star, and Hsd3b1 were reduced in knockout testis compared to wild-type testis, beginning at 12.5 dpc. Whole mount in situ hybridization confirmed that Cyp11a1 expression was reduced in the null testis, but its distribution pattern was unchanged. Apoptosis was not affected by the loss of beta glycan, but proliferation within the interstitium was reduced at 14.5 dpc. However, morphometric analysis showed no changes in Leydig cell counts between the wild-type and the knockout testes at 14.5 dpc, indicating that fetal Leydig function, rather than number, was affected by the loss of beta glycan. The expression levels of Sertoli cell markers Dhh, Sox9, and Amh were also reduced in the knockout testis at 14.5 dpc. However, the expression of fetal germ cell markers Pou5f1 and DDX4 were not changed across the genotypes at any age examined. Our data show that the presence of beta glycan is required for normal cord formation, normal fetal Leydig cell development, and the establishment of fetal testis endocrine function, thus implicating TGFB superfamily members as regulators of early fetal testis structure and function.


Assuntos
Proteoglicanas/metabolismo , Receptores de Fatores de Crescimento Transformadores beta/metabolismo , Diferenciação Sexual , Testículo/embriologia , Testículo/metabolismo , Animais , Feto/metabolismo , Células Intersticiais do Testículo/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout
6.
Mol Endocrinol ; 23(4): 539-48, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19164448

RESUMO

Betaglycan is a type III TGFbeta receptor that modulates cellular sensitivity to inhibins and TGFbeta. Previous studies have suggested that betaglycan acts as a tumor suppressor in certain human epithelial cancers. However, the roles of betaglycan in ovarian granulosa cell tumors (GCTs) are poorly understood. The objective of this study was to determine whether human GCTs exhibit betaglycan expression and, if so, what impact this receptor has on tumor biology. Real-time PCR was used to quantify betaglycan transcripts in human GCTs (n = 17) and normal premenopausal ovaries (n = 11). This analysis established that GCTs exhibited a significant 2-fold lower mean betaglycan mRNA level as compared with the normal ovary (P < 0.05). Similarly, two human GCT cell lines, KGN and COV434, exhibited low betaglycan expression and poor responsiveness to TGFbeta and inhibin A in luciferase reporter assays, which was restored by stable transfection of wild-type betaglycan. Betaglycan significantly increased the adhesion of COV434 (P < 0.05) and KGN (P < 0.0001) cells, decreased cellular invasion through Matrigel, and inhibited wound healing. Expression of mutant forms of betaglycan that are defective in TGFbeta and/or inhibin binding in each GCT cell line revealed that the inhibitory effects of betaglycan on wound healing were most strongly linked to the inhibin-binding region of betaglycan. Furthermore, knockdown of INHA mRNA expression abrogated the betaglycan-mediated inhibition of wound healing and invasion, whereas both INHA silencing and TGFbeta neutralization abolished the betaglycan-mediated increase in adhesion to substrate. These data suggest that loss of betaglycan contributes to the pathogenesis of GCTs.


Assuntos
Tumor de Células da Granulosa/patologia , Neoplasias Ovarianas/patologia , Proteoglicanas/metabolismo , Receptores de Fatores de Crescimento Transformadores beta/metabolismo , Ativinas/genética , Ativinas/metabolismo , Adesão Celular/fisiologia , Linhagem Celular Tumoral , Feminino , Inativação Gênica , Tumor de Células da Granulosa/metabolismo , Humanos , Inibinas/genética , Inibinas/metabolismo , Ligantes , Invasividade Neoplásica , Neoplasias Ovarianas/metabolismo , Proteoglicanas/genética , Receptores de Fatores de Crescimento Transformadores beta/genética , Fator de Crescimento Transformador beta/genética , Fator de Crescimento Transformador beta/metabolismo
8.
J Nutr ; 139(8): 1445-50, 2009 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-19535421

RESUMO

Studies in our laboratory have previously demonstrated in hamsters a superior cholesterol-lowering ability of plant sterol (PS) esters enriched in stearate compared with linoleate. We therefore conducted a randomized, double-blind, 2-group parallel, placebo-controlled study to test the cholesterol-lowering properties of stearate-enriched PS esters in normo- and hypercholesterolemic adults. Thirty-two adults, 16 per group with equal number of males and females in each group, participated in the 4-wk study. Participants consumed 3 g/d (1 g three times per day with meals) of either PS esters or placebo delivered in capsules. Serum LDL cholesterol concentration significantly decreased 0.42 mmol/L (11%) and the LDL:HDL cholesterol ratio decreased 10% with PS ester supplementation, whereas LDL particle size and lipoprotein subclass particle concentrations (as measured by NMR) were not affected. The percent change in LDL cholesterol was positively correlated with baseline lathosterol concentration (r = 0.729; P = 0.0014), indicating an association between the magnitude of LDL change and the rate of whole-body cholesterol synthesis. Serum campesterol (but not sitosterol) concentration significantly increased in the PS ester group. Serum tocopherol, retinol, and beta-carotene concentrations were not affected by PS ester supplementation. Thus, our findings demonstrate the usefulness of a novel stearate-enriched PS ester compound in decreasing LDL cholesterol in both normo- and hypercholesterolemic adults. The extent to which PS ester fatty acid composition affects intestinal micelle formation and cholesterol absorption in humans requires further study.


Assuntos
Anticolesterolemiantes/uso terapêutico , LDL-Colesterol/sangue , Hipercolesterolemia/tratamento farmacológico , Fitosteróis/uso terapêutico , Estearatos/uso terapêutico , Adulto , Idoso , Anticolesterolemiantes/farmacologia , Celulose/farmacologia , Celulose/uso terapêutico , Colesterol/biossíntese , Colesterol/sangue , HDL-Colesterol/sangue , Método Duplo-Cego , Feminino , Humanos , Hipercolesterolemia/sangue , Masculino , Pessoa de Meia-Idade , Fitosteróis/farmacologia , Estearatos/farmacologia
9.
J Ovarian Res ; 12(1): 8, 2019 Jan 26.
Artigo em Inglês | MEDLINE | ID: mdl-30684970

RESUMO

BACKGROUND: Ovarian hyperstimulation syndrome remains a serious complication during in vitro fertilization cycles if high dose human chorionic gonadotropin (hCG) is used to trigger ovulation in high responder patients. Though much of this risk is mitigated with trigger using gonadotropin releasing-hormone (GnRH) agonist alone, it may result in lower birth rates. GnRH-agonist trigger and adjuvant low dose hCG has been proposed to improve birth rates, but timing of this hCG support to corpus luteum function has never been fully described. In this randomized, prospective trial, we explore differences in live birth rates and incidence of ovarian hyperstimulation syndrome (OHSS) in high-responder patients undergoing in vitro fertilization (IVF) receiving low dose hCG at the time of GnRH-agonist (dual trigger) or hCG adjuvant at the time of oocyte retrieval. Does the timing of hCG support make a difference? RESULTS: Thirty-four subjects high-responder patients were randomized to receive low-dose hCG at the time of GnRH-agonist trigger (Group 1) and 37 received low-dose hCG at the time of oocyte retrieval (Group 2). There were no differences in the baseline characteristics and outcome of ovarian stimulation between the two groups. There were no differences in the live birth rates between Group 1 and Group 2 by intention-to-treat (14/34, 41.2% versus 21/37, 56.8%, p = 0.19) or per-protocol (14/26, 53.8% versus 19/31, 61.3%, p = 0.57) analyses. There was a slightly higher incidence of OHSS in Group 2 compared to Group 1 although the difference was not statistically significant (3/31, 9.7% versus 1/26, 3.8%). All the cases of OHSS in Group 2 were moderate while the one case of OHSS in Group 1 was mild. CONCLUSIONS: For high responder patients receiving GnRH-agonist trigger, low dose hCG supplementation allowed high pregnancy rates after fresh embryo transfer, regardless of whether it was given at the time of trigger or at oocyte retrieval. Dual trigger may be preferable to reduce the risk of OHSS.


Assuntos
Gonadotropina Coriônica/administração & dosagem , Fertilização in vitro , Hormônio Liberador de Gonadotropina/agonistas , Indução da Ovulação/métodos , Taxa de Gravidez , Adulto , Método Duplo-Cego , Feminino , Humanos , Nascido Vivo , Síndrome de Hiperestimulação Ovariana/induzido quimicamente , Gravidez , Estudos Prospectivos , Risco
10.
Appl Health Econ Health Policy ; 17(6): 841-855, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31317511

RESUMO

BACKGROUND: Poor adherence to medications is a global public health concern with substantial health and cost implications, especially for chronic conditions. In the USA, poor adherence is estimated to cause 125,000 deaths and cost $US100 billion annually. The most successful adherence-promoting strategies that have been identified so far have moderate effect, are relatively costly, and raise availability, feasibility, and/or scalability issues. OBJECTIVE: The main objective of SIGMA (Study on Incentives for Glaucoma Medication Adherence) was to measure the effectiveness on medication adherence of a novel incentive strategy based on behavioral economics that we refer to as adherence-contingent rebates. These rebates offered patients a near-term benefit while leveraging loss aversion and regret and increasing the salience of adherence. METHODS: SIGMA is a 6-month randomized, controlled, open-label, single-center superiority trial with two parallel arms. A total of 100 non-adherent glaucoma patients from the Singapore National Eye Centre were randomized into intervention (adherence-contingent rebates) and usual care (no rebates) arms in a 1:1 ratio. The primary outcome was the mean change from baseline in percentage of adherent days at Month 6. The trial registration number is NCT02271269 and a detailed study protocol has been published elsewhere. FINDINGS: We found that participants who were offered adherence-contingent rebates were adherent to all their medications on 73.1% of the days after 6 months, which is 12.2 percentage points (p = 0.027) higher than in those not receiving the rebates after controlling for baseline differences. This better behavioral outcome was achieved by rebates averaging 8.07 Singapore dollars ($US5.94 as of 2 November 2017) per month during the intervention period. CONCLUSION: This study shows that simultaneously leveraging several insights from behavioral economics can significantly improve medication adherence rates. The relatively low cost of the rebates and significant health and cost implications of medication non-adherence suggest that this strategy has the potential to cost-effectively improve health outcomes for many conditions.


Assuntos
Doença Crônica/tratamento farmacológico , Tratamento Farmacológico/economia , Glaucoma/tratamento farmacológico , Adesão à Medicação , Reembolso de Incentivo , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
11.
Journal of Liver Cancer ; : 219-224, 2023.
Artigo em Inglês | WPRIM | ID: wpr-967547

RESUMO

Hepatoblastoma is an exceptionally rare malignancy in adults with just over 70 non-pediatric cases reported in literature. Recounted is a case of a 49-year-old female who presented with acute right upper quadrant abdominal pain, elevated serum alpha fetoprotein and a large liver mass on imaging. Hepatectomy was performed under clinical suspicion of hepatocellular carcinoma. Immunomorphologic characteristics of the tumor proved consistent with hepatoblastoma of mixed epithelial and mesenchymal type. Hepatocellular carcinoma remains to be the primary differential diagnosis for adult hepatoblastoma, however, distinguishing between these two neoplasms requires close histomorphologic assessment and immunohistochemical profiling as clinical, radiologic and gross pathologic findings typically overlap. Making this distinction is highly crucial in the timely initiation of surgical and chemotherapeutic interventions for this inherently aggressive and rapidly fatal disease.

12.
Haematologica ; 92(2): 283-4, 2007 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-17296593

RESUMO

We retrospectively investigated the association between platelet autoantibody specificity and response to intravenous immunoglobulin G (IVIG) in 17 patients with immune thrombocytopenia (ITP). Platelet-associated antibodies against glycoprotein (GP) IIb/IIIa, GPIb/IX, and GPIa/IIa were detected in 13, 10, and 8 patients, respectively. A response occurred in 7 of 7 patients without anti-GPIb/IX, but in only 3 of 10 patients with anti-GPIb/IX (p<0.01). There was no difference in the response rates in patients with or without anti-GPIIb/IIIa or anti-GPIa/IIa. We conclude that ITP patients with anti-GPIb/IX may be less responsive to IVIG.


Assuntos
Autoanticorpos/imunologia , Plaquetas/imunologia , Imunoglobulina G/administração & dosagem , Imunoglobulina G/uso terapêutico , Trombocitopenia/sangue , Trombocitopenia/tratamento farmacológico , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Infusões Intravenosas , Integrina alfa2beta1/sangue , Masculino , Pessoa de Meia-Idade , Complexo Glicoproteico GPIIb-IIIa de Plaquetas/biossíntese , Complexo Glicoproteico GPIb-IX de Plaquetas/biossíntese , Estudos Retrospectivos
13.
Mol Cell Biol ; 23(12): 4371-85, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12773577

RESUMO

The type III transforming growth factor beta (TGFbeta) receptor (TbetaRIII) binds both TGFbeta and inhibin with high affinity and modulates the association of these ligands with their signaling receptors. However, the significance of TbetaRIII signaling in vivo is not known. In this study, we have sought to determine the role of TbetaRIII during development. We identified the predominant expression sites of TbetaRIII mRNA as liver and heart during midgestation and have disrupted the murine TbetaRIII gene by homologous recombination. Beginning at embryonic day 13.5, mice with mutations in TbetaRIII developed lethal proliferative defects in heart and apoptosis in liver, indicating that TbetaRIII is required during murine somatic development. To assess the effects of the absence of TbetaRIII on the function of its ligands, primary fibroblasts were generated from TbetaRIII-null and wild-type embryos. Our results indicate that TbetaRIII deficiency differentially affects the activities of TGFbeta ligands. Notably, TbetaRIII-null cells exhibited significantly reduced sensitivity to TGFbeta2 in terms of growth inhibition, reporter gene activation, and Smad2 nuclear localization, effects not observed with other ligands. These data indicate that TbetaRIII is an important modulator of TGFbeta2 function in embryonic fibroblasts and that reduced sensitivity to TGFbeta2 may underlie aspects of the TbetaRIII mutant phenotype.


Assuntos
Coração/embriologia , Fígado/embriologia , Proteoglicanas/metabolismo , Receptores de Fatores de Crescimento Transformadores beta/metabolismo , Fator de Crescimento Transformador beta/genética , Fator de Crescimento Transformador beta/metabolismo , Animais , Northern Blotting , Southern Blotting , Núcleo Celular/metabolismo , Relação Dose-Resposta a Droga , Fibroblastos/metabolismo , Citometria de Fluxo , Genes Reporter , Immunoblotting , Imuno-Histoquímica , Concentração Inibidora 50 , Ligantes , Camundongos , Camundongos Knockout , Microscopia de Fluorescência , Modelos Genéticos , Miocárdio/metabolismo , Fenótipo , RNA Mensageiro/metabolismo , Recombinação Genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Sensibilidade e Especificidade , Transdução de Sinais , Fatores de Tempo
15.
Mol Cell Endocrinol ; 436: 68-77, 2016 11 15.
Artigo em Inglês | MEDLINE | ID: mdl-27465829

RESUMO

This study tested the hypothesis that inhibins act in an autocrine manner on Leydig cells using a pre-pubertal Leydig cell line, TM3, as a model of immature Leydig cells. The expression of Inha, Inhba, and Inhbb in TM3 cells was determined by RT-PCR and the production of the inhibin-alpha subunit was confirmed by western blot. Knockdown of Inha expression resulted in significant decreases in the expression of Leydig cell markers Cyp17a1, Cyp11a1, Nr5a1, and Insl3. Western blot showed that activin A, TGFß1 and TGFß2 activated SMAD2, and that knockdown of Inha expression in TM3 cells enhanced both activin A- and TGFß-induced SMAD2 activation. SB431542, a chemical inhibitor of the TGFß/activin type I receptors, blocked ligand-induced SMAD2 activation and the downregulation of Cyp17a1 expression. Our findings demonstrate that TGFßs and activin A negatively regulate steroidogenic gene expression in TM3 cells via ALK4/5 and SMAD2 and endogenous inhibins can counter this regulation.


Assuntos
Inibinas/metabolismo , Células Intersticiais do Testículo/metabolismo , Transdução de Sinais , Proteína Smad2/metabolismo , Esteroides/biossíntese , Ativinas/metabolismo , Animais , Linhagem Celular , Regulação para Baixo/genética , Técnicas de Silenciamento de Genes , Humanos , Inibinas/genética , Masculino , Camundongos Endogâmicos C57BL , Subunidades Proteicas/metabolismo , Esteroide 17-alfa-Hidroxilase/genética , Esteroide 17-alfa-Hidroxilase/metabolismo , Fator de Crescimento Transformador beta/metabolismo
16.
Trials ; 17(1): 316, 2016 07 15.
Artigo em Inglês | MEDLINE | ID: mdl-27422389

RESUMO

BACKGROUND: Many glaucoma patients do not adhere to their medication regimens because they fail to internalize the (health) costs of non-adherence, which may not occur until years or decades later. Behavioural economic theory suggests that adherence rates can be improved by offering patients a near-term benefit. Our proposed strategy is to offer adherence-contingent rebates on medication and check-up costs. This form of value pricing (VP) ensures that rebates are granted only to those most likely to benefit. Moreover, by leveraging loss aversion, rebates are expected to generate a stronger behavioural response than equivalent financial rewards. METHODS/DESIGN: The main objective of the Study on Incentives for Glaucoma Medication Adherence (SIGMA) is to test the VP approach relative to usual care (UC) in improving medication adherence. SIGMA is a randomized, controlled, open-label, single-centre superiority trial with two parallel arms. A total of 100 non-adherent (Morisky Medication Adherence Scale ≤6) glaucoma patients from the Singapore National Eye Centre are block-randomized (blocking factor: single versus multiple medications users) into the VP and UC arms in a 1:1 ratio. The treatment received by VP patients will be strictly identical to that received by UC patients, with the only exception being that VP patients can earn either a 50 % or 25 % rebate on their glaucoma-related healthcare costs conditional on being adherent on at least 90 % or 75 % of days as measured by a medication event monitoring system. Masking the arm allocation will be precluded by the behavioural nature of the intervention but blocking size will not be disclosed to protect concealment. The primary outcome is the mean change from baseline in percentage of adherent days at month 6. A day will be counted as adherent when the patients take all their medication(s) within the appropriate dosing windows. DISCUSSION: This trial will provide evidence on whether adherence-contingent rebates can improve medication adherence among non-adherent glaucoma patients, and more generally whether this approach represents a promising strategy to cost-effectively improve chronic disease management. TRIAL REGISTRATION: NCT02271269 . Registered on 19 October 2014.


Assuntos
Custos de Medicamentos , Glaucoma/tratamento farmacológico , Glaucoma/economia , Reembolso de Seguro de Saúde , Adesão à Medicação , Motivação , Visita a Consultório Médico/economia , Seguro de Saúde Baseado em Valor/economia , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Glaucoma/diagnóstico , Glaucoma/psicologia , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Masculino , Pessoa de Meia-Idade , Projetos de Pesquisa , Medição de Risco , Fatores de Risco , Singapura , Fatores de Tempo , Resultado do Tratamento , Adulto Jovem
17.
Biol Open ; 5(3): 323-35, 2016 Feb 16.
Artigo em Inglês | MEDLINE | ID: mdl-26883626

RESUMO

Planar cell polarity (PCP) is controlled by a conserved pathway that regulates directional cell behavior. Here, we show that mutant mice harboring a newly described mutation termed Beetlejuice (Bj) in Prickle1 (Pk1), a PCP component, exhibit developmental phenotypes involving cell polarity defects, including skeletal, cochlear and congenital cardiac anomalies. Bj mutants die neonatally with cardiac outflow tract (OFT) malalignment. This is associated with OFT shortening due to loss of polarized cell orientation and failure of second heart field cell intercalation mediating OFT lengthening. OFT myocardialization was disrupted with cardiomyocytes failing to align with the direction of cell invasion into the outflow cushions. The expression of genes mediating Wnt signaling was altered. Also noted were shortened but widened bile ducts and disruption in canonical Wnt signaling. Using an in vitro wound closure assay, we showed Bj mutant fibroblasts cannot establish polarized cell morphology or engage in directional cell migration, and their actin cytoskeleton failed to align with the direction of wound closure. Unexpectedly, Pk1 mutants exhibited primary and motile cilia defects. Given Bj mutant phenotypes are reminiscent of ciliopathies, these findings suggest Pk1 may also regulate ciliogenesis. Together these findings show Pk1 plays an essential role in regulating cell polarity and directional cell migration during development.

18.
J Adolesc Health ; 57(1): 46-51, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-26095408

RESUMO

PURPOSE: The aim of this study was to examine the prevalence, attitudes, and risk factors associated with electronic cigarette (e-cigarette) use among high school students in tobacco growing state. METHODS: A 47-item e-cigarette questionnaire modeled after Monitoring the Future with additional information about demographics, adolescent and family nicotine use, and school and health care interventions was designed, piloted, and administered to public high school students (N = 3,298) in May 2013, in an urban county in North Carolina. RESULTS: Completers (2,769/3,298) were aged 16.4 years (standard deviation ± 1.4) with 48.9% males and 43.9% African-American, 38% white, and 4.6% Hispanics. The majority (77.3%) knew about e-cigarettes; 15.2% reported that they had tried an e-cigarette, and 60% reported that e-cigarettes were safe or had minimal health hazards. Only 5.4% reported that schools had offered information about e-cigarette use. One quarter (24.9%) reported ever cigarette smoking, and 13.3% reported ever using smokeless tobacco. E-cigarette use was positively associated with older age, tobacco use, male gender, Caucasian race, mother's e-cigarette use, biological parents' tobacco use, and lower academic performance, whereas negatively associated with having a mother who never used e-cigarettes, not knowing any e-cigarette users, and living with mother (p < .05). CONCLUSIONS: E-cigarette use and awareness is evident among high school students in North Carolina. A high number of smokers and smokeless tobacco users are using e-cigarettes simultaneously, and many perceive e-cigarettes as healthy and with minimal health hazards. Also, there is limited school-based education about e-cigarettes.


Assuntos
Comportamento do Adolescente/psicologia , Atitude Frente a Saúde , Sistemas Eletrônicos de Liberação de Nicotina/psicologia , Sistemas Eletrônicos de Liberação de Nicotina/estatística & dados numéricos , Estudantes/psicologia , População Urbana , Adolescente , Estudos Transversais , Feminino , Inquéritos Epidemiológicos , Humanos , Masculino , North Carolina , Prevalência , Fatores de Risco , Inquéritos e Questionários , População Urbana/estatística & dados numéricos
19.
Food Chem ; 177: 295-303, 2015 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-25660889

RESUMO

A predictive response surface model for the influences of product (soluble solids and titratable acidity) and process (temperature and heating time) parameters on the degradation of ascorbic acid (AA) in heated simulated fruit juices (SFJs) was established. Physicochemical property ranges of freshly squeezed and processed juices, and a previously established decimal reduction times of Escherichiacoli O157:H7 at different heating temperatures were used in establishing a Central Composite Design of Experiment that determined the combinations of product and process variable used in the model building. Only the individual linear effects of temperature and heating time significantly (P<0.05) affected AA reduction (%AAr). Validating systems either over- or underestimated actual %AAr with bias factors 0.80-1.20. However, all validating systems still resulted in acceptable predictive efficacy, with accuracy factor 1.00-1.26. The model may be useful in establishing unique process schedules for specific products, for the simultaneous control and improvement of food safety and quality.


Assuntos
Ácido Ascórbico/química , Bebidas/análise , Frutas/química , Modelos Químicos , Ácido Ascórbico/análise , Manipulação de Alimentos , Inocuidade dos Alimentos , Temperatura Alta , Reprodutibilidade dos Testes , Temperatura
20.
Arch Ophthalmol ; 111(6): 841-3, 1993 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-8512488

RESUMO

We describe a 56-year-old white man who presented with gradual and progressive visual loss and subsequent hypertension and pedal edema. A computed tomographic scan of the orbits showed bilateral diffuse retrobulbar masses, and an abdominal computed tomographic scan showed a diffuse retroperitoneal mass invading the aorta, ureters, and inferior vena cava. Biopsies of the orbit and abdomen confirmed a heterogeneous cell population and marked fibrosis consistent with a sclerosing inflammatory process. Bilateral sclerosing orbital inflammatory disease should cue the physician to suspect coexisting systemic disease. This report is the fourth to document bilateral sclerosing orbital inflammatory disease and the second to have obtained biopsies of the orbit and abdomen showing histologic similarities.


Assuntos
Pseudotumor Orbitário/complicações , Fibrose Retroperitoneal/complicações , Biópsia , Fibrose/patologia , Humanos , Masculino , Pessoa de Meia-Idade , Órbita/patologia , Pseudotumor Orbitário/patologia , Fibrose Retroperitoneal/patologia , Espaço Retroperitoneal/patologia , Esclerose/patologia , Tomografia Computadorizada por Raios X
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA