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1.
Conserv Biol ; 37(2): e14009, 2023 04.
Artigo em Inglês | MEDLINE | ID: mdl-36285591

RESUMO

The loss and degradation of nature can lead to hopelessness and despair, which may undermine engagement in conservation actions. Emerging movements, such as that behind the organization Conservation Optimism, aim to avert potential despair of those involved in conservation. Some argue that fostering positive states, such as hope or optimism, can motivate engagement and action; however, others question whether fostering hope or optimism may inadvertently undermine perceived gravity of conservation challenges. We examined this issue by quantifying dispositional hope and optimism with a representative sample of Australians (n = 4285) and assessing their relationship with indicators of conservation engagement. We used the Great Barrier Reef (GBR) in Australia as a case study. We asked participants what they could do to help the GBR, then classified their responses into 2 outcome variables: identifying climate actions (i.e., actions that tackle the main threat to the reef) and identifying plastic actions (i.e., actions that are popular among community members). We also quantified likelihood of performing these actions and appraisals of both threats and actions. One dimension of hope, hope pathways (defined by Snyder's hope theory as knowing different ways to act), was associated with greater capacity to identify climate-related behaviors (odds ratio [OR] = 1.44) and plastic reduction behaviors (OR = 1.22) and greater likelihood of adopting climate-related actions (ß = 0.20). Optimism was associated with recognition of plastic reduction behaviors only (OR = 1.22). Neither hope nor optimism undermined appraisal of conservation threats. The effects of optimism were mediated by reduced action futility, and effects of hope pathways were mediated by stronger perceptions of threats to the reef (threat appraisal) and confidence in performing useful actions (coping appraisal). Our findings suggest that dispositional hope can strengthen, rather than undermine, appraisal of conservation challenges and solutions and thereby increase conservation engagement.


La pérdida y la degradación de la naturaleza pueden derivar en desesperanza y desesperación, las cuales pueden disminuir la participación en las actividades de conservación. Los movimientos, como aquél detrás de la organización Conservation Optimism, buscan evitar la potencial desesperación de aquellos involucrados en la conservación. Hay quienes argumentan que promover estados positivos, como la esperanza y el optimismo, puede debilitar inadvertidamente la gravedad percibida de los retos para la conservación. Analizamos este tema mediante la cuantificación de la disposición a la esperanza y el optimismo en una muestra representativa de australianos (n = 4285) y la valoración de sus relaciones con los indicadores de participación en la conservación. Usamos la Gran Barrera de Arrecife como un estudio de caso. Preguntamos a los participantes qué podrían hacer para ayudar a este ecosistema y después clasificamos sus respuestas en dos variables de resultado: identificar acciones climáticas (acciones que combaten la amenaza principal del arrecife) e identificar acciones plásticas (acciones que son populares entre los miembros de la comunidad). También cuantificamos la probabilidad de realizar estas acciones y las valoraciones tanto de las amenazas como de las acciones. Una dimensión de la esperanza, los caminos de la esperanza (definidas por la Teoría de la Esperanza de Snyder como saber actuar de diferentes maneras), estuvo asociada con una mayor capacidad para identificar los comportamientos relacionados con el clima (razón de oportunidades [OR]=1.44) y aquellos de reducción del plástico (OR = 1.22) y también con una mayor probabilidad de actuar en relación con el clima (ß = 0.20). El optimismo solamente estuvo asociado con el reconocimiento de los comportamientos de reducción del plástico (OR = 1.22). Ni el optimismo ni la esperanza debilitaron la valoración de las amenazas a la conservación. Los efectos del optimismo estuvieron mediados por la reducción de la futilidad de las acciones, mientras que los efectos de los caminos de la esperanza lo estuvieron por percepciones más firmes de las amenazas para el arrecife (valoración de amenazas) y la confianza en realizar acciones útiles (valoración del afrontamiento). Nuestros resultados sugieren que la disposición a la esperanza puede fortalecer, en lugar de debilitar, la valoración de la conservación y, por lo tanto, incrementar su participación.


Assuntos
Conservação dos Recursos Naturais , Humanos , Austrália , Probabilidade
2.
J Environ Manage ; 342: 118128, 2023 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-37210815

RESUMO

Diverse solutions are needed to reduce human impacts on nature. Fostering individual stewardship behaviours that protect, restore, and encourage sustainable use of nature will need to be part of this mix of solutions. A key challenge then is how to increase the uptake of such behaviours. Social capital provides a framework to explore the diverse types of social influences on nature stewardship. We surveyed a representative sample of residents of New South Wales, Australia (n = 3220) to explore how facets of social capital influenced individual willingness to adopt diverse types of stewardship behaviours. Analysis confirmed that parts of social capital differentially influence distinct types of stewardship behaviours including lifestyle, social, on-ground, and citizenship behaviours. All behaviours were positively influenced by perceptions of shared values within social network, and past participation in environmental groups. Yet some components of social capital exhibited mixed associations with each type of stewardship behaviour. For example, collective agency was associated with greater willingness to engage in social, on-ground, and citizenship behaviours, whereas institutional trust was negatively associated with willingness to engage in lifestyle, on-ground and citizenship behaviours. These findings show that social context provides an important foundation for building stewardship engagement.


Assuntos
Capital Social , Humanos , Austrália , Meio Social , Confiança , Inquéritos e Questionários
3.
Environ Manage ; 68(2): 184-197, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-34125266

RESUMO

Peri-urban areas, defined as the region between urban and rural settlements, are heterogeneous, dynamic regions experiencing rapid land use change in cities around the world. Ongoing development and land use change has resulted in the fragmentation, degradation and loss of natural assets, threatening biodiversity, and ecosystems within the peri-urban region. With much of this land privately owned, the actions of landholders have considerable opportunity to deliver environmental outcomes, yet an understanding of this diverse group of landholders is challenging. Through a survey of landholders (N = 184) in Australian peri-urban regions we sought to understand motivations and barriers to engagement in environmental management. Factors influencing willingness to engage in environmental management included perceived personal capacity to act, feeling that actions were helpful, and community participation. We discuss how engagement strategies could incorporate these findings by focussing on improving capacity and environmental knowledge with hands on, face-to-face extension activities, encouraging simple actions, and fostering greater community interaction.


Assuntos
Conservação dos Recursos Naturais , Ecossistema , Austrália , Biodiversidade , Cidades
4.
Am J Physiol Gastrointest Liver Physiol ; 318(4): G682-G693, 2020 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-32003602

RESUMO

Postprandial dyslipidemia is a common feature of insulin-resistant states and contributes to increased cardiovascular disease risk. Recently, bile acids have been recognized beyond their emulsification properties as important signaling molecules that promote energy expenditure, improve insulin sensitivity, and lower fasting lipemia. Although bile acid receptors have become novel pharmaceutical targets, their effects on postprandial lipid metabolism remain unclear. Here, we investigated the potential role of bile acids in regulation of postprandial chylomicron production and triglyceride excursion. Healthy C57BL/6 mice were given an intraduodenal infusion of taurocholic acid (TA) under fat-loaded conditions, and circulating lipids were measured. Targeting of bile acid receptors was achieved with GW4064, a synthetic agonist to the farnesoid X receptor (FXR), and deoxycholic acid (DCA), an activator of the Takeda G-protein-coupled receptor 5. TA, GW4064, and DCA treatments all lowered postprandial lipemia. FXR agonism also reduced intestinal triglyceride content and activity of microsomal triglyceride transfer protein, involved in chylomicron assembly. Importantly, TA (but not DCA) effects were largely lost in FXR knockout mice. These bile acid effects are reminiscent of the antidiabetic hormone glucagon-like peptide-1 (GLP-1). Although the GLP-1 receptor agonist exendin-4 retained its ability to acutely lower postprandial lipemia during bile acid sequestration and FXR deficiency, it did raise hepatic expression of the rate-limiting enzyme for bile acid synthesis. Bile acid signaling may be an important mechanism of controlling dietary lipid absorption, and bile acid receptors may constitute novel targets for the treatment of postprandial dyslipidemia.NEW & NOTEWORTHY We present new data suggesting potentially important roles for bile acids in regulation of postprandial lipid metabolism. Specific bile acid species, particularly secondary bile acids, were found to markedly inhibit absorption of dietary lipid and reduce postprandial triglyceride excursion. These effects appear to be mediated via bile acid receptors, farnesoid X receptor (FXR) and Takeda G protein-coupled receptor 5 (TGR5). Importantly, bile acid signaling may trigger glucagon-like peptide-1 (GLP-1) secretion, which may in turn mediate the marked inhibitory effects on dietary fat absorption.


Assuntos
Ácido Desoxicólico/farmacologia , Hiperlipidemias/tratamento farmacológico , Isoxazóis/farmacologia , Metabolismo dos Lipídeos/efeitos dos fármacos , Período Pós-Prandial , Receptores Citoplasmáticos e Nucleares/agonistas , Animais , Ácidos e Sais Biliares/metabolismo , Ácidos e Sais Biliares/farmacologia , Colesterol 7-alfa-Hidroxilase/genética , Colesterol 7-alfa-Hidroxilase/metabolismo , Exenatida/farmacologia , Esvaziamento Gástrico/efeitos dos fármacos , Regulação da Expressão Gênica/efeitos dos fármacos , Insulina/sangue , Mucosa Intestinal , Intestinos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Receptores Acoplados a Proteínas G/agonistas , Ácido Taurocólico/farmacologia
5.
Conserv Biol ; 34(1): 93-102, 2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-31152562

RESUMO

Attitudes have been a commonly used psychological measure of program effectiveness in conservation social science research. The major limitation of this approach is that attitudes do not always translate into behavior and therefore may not provide an accurate assessment of program success. Given that achieving conservation goals generally relies on understanding and changing human behavior, we argue for the need to assess behavior rather than attitudes as an indicator of conservation outcomes. Psychological theory shows that attitudes and behavior are distinct, but related, concepts. Measuring conservation behaviors involves identifying the target behavior or behaviors and the optimal time to measure and then selecting the most appropriate method of measurement (i.e., direct observation, objective indicators, self-reported behavior, and behavioral intentions) that considers the strengths and weaknesses of each approach. We call for conservation programs to focus on influencing behavior rather than attitudes alone and encourage conservation practitioners and researchers to collect high-quality behavioral data to more effectively inform policy and programs.


Logro del Impacto de la Conservación Cambiando el Enfoque en las Actitudes Humanas a los Comportamientos Resumen Las actitudes han sido utilizadas comúnmente como una medida psicológica de la eficacia de una investigación de ciencias sociales de la conservación. La principal limitación de este enfoque es que las actitudes no siempre se traducen en comportamiento y, por lo tanto, pueden no proporcionar una evaluación precisa del éxito del programa. Dado que el logro de los objetivos de conservación generalmente se basa en la comprensión y el cambio del comportamiento humano, argumentamos la necesidad de evaluar el comportamiento en lugar de las actitudes como un indicador de los resultados de conservación. La teoría psicológica muestra que las actitudes y el comportamiento son conceptos distintos, pero relacionados. La medida de comportamientos de conservación implica la identificación del comportamiento o los comportamientos buscados y del tiempo óptimo para medirlos y luego seleccionar el método de medición más apropiado (i. e., observación directa, indicadores objetivos, comportamiento auto reportado e intenciones de comportamiento) que considere las fortaleza y debilidades de cada enfoque. Hacemos un llamado para que los programas de conservación se centren en influir en el comportamiento en lugar de las actitudes por sí solas y alentamos a que los profesionales e investigadores de la conservación recopilen datos conductuales de calidad para que las políticas y programas tengan información eficaz.


Assuntos
Atitude , Conservação dos Recursos Naturais , Humanos
6.
J Environ Manage ; 254: 109777, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31733476

RESUMO

Psychosocial factors determine individual and collective behaviours, and there is growing evidence of their influence on land management behaviours. Native vegetation management encompasses biophysical, economic, political, and cultural dimensions that are immensely complex, and a more thorough understanding of the personal and cultural dimensions of deforestation activity is required. We emphasise this interdisciplinary imperative using Queensland, Australia, as an exemplar case study, where the controversial Vegetation Management Act1999 has been met with significant scrutiny over its effects on private landholders and its ability to curb deforestation behaviours. We surveyed landholders across Queensland in order to identify different landholder typologies based upon (1) their recent tree clearing behaviours and (2) their psychosocial characteristics, mapped their distribution in the landscape, and determined the unique demographic and psychosocial factors associated with typology membership. We identified a heterogeneous mosaic of landholders in the clearing landscape, composed of four clearing typologies and five psychosocial typologies. Social norms, identity, trust, and security played crucial roles in distinguishing different types of landholders. The two most contrasting clearing typologies-active and inactive clearers-were primarily located in hot- and cold-spots of deforestation, respectively; in contrast, most psychosocial typologies could be found throughout the landscape, highlighting the potential benefit of complementing generalised state-wide psychosocial targets with localised behavioural targets. We discuss how conservation policy instruments can be regionally tailored, and relevant strategies for effective communication and engagement can be developed to create behaviour change by understanding the characteristics and distribution of these types of landholders. If modified top-down efforts (e.g. strategic messages, community-based communication) can be supplemented with more bottom-up approaches (e.g. collective learning, building network support), sustainable land management in deforestation hotspots around the world may be achievable.


Assuntos
Conservação dos Recursos Naturais , Mudança Social , Austrália , Queensland , Inquéritos e Questionários
7.
Environ Manage ; 66(3): 289-304, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32588074

RESUMO

Voluntary private land conservation (PLC) is becoming an increasingly important complement to state protected areas around the world. PLC programs can serve as valuable strategies to increase biodiversity on agricultural lands, but their effectiveness depends on high participation rates. Amidst growing concerns regarding scalability and effectiveness of conservation strategies like national parks, researchers and practitioners are looking for new strategies to increase adoption of PLC. This study investigates the demographic, social, and psychological factors associated with participation in three classes of voluntary PLC programs-grant payments, land management agreements, and covenants-and how this relates to landholders' attitudes toward tree clearing. We compare participation rates between these programs in Queensland and identify the most frequently cited reasons why land managers have or have not participated. Land managers who are more involved in agricultural organizations and whose tree clearing decisions are more influenced by the aesthetic value of trees are more likely to have participated in one or more of these programs. Participation was highly biased toward once-off grant payments, and participation in covenants was lowest of all programs. Although 58% of land managers have never participated, nearly half expressed interest in one or more programs. A lack of program knowledge and perceived losses of autonomy were the most frequently cited barriers to participation. We conclude with recommendations for increasing participation rates and raise important questions that need to be answered in order to promote a PLC culture that effectively curbs ongoing habitat degradation.


Assuntos
Capital Social , Árvores , Austrália , Conservação dos Recursos Naturais , Ecossistema , Percepção , Queensland
8.
J Cogn Neurosci ; 31(7): 1044-1053, 2019 07.
Artigo em Inglês | MEDLINE | ID: mdl-30883291

RESUMO

Recent behavioral modeling and pupillometry studies suggest that neuromodulatory arousal systems play a role in regulating decision formation but neurophysiological support for these observations is lacking. We employed a randomized, double-blinded, placebo-controlled, crossover design to probe the impact of pharmacological enhancement of catecholamine levels on perceptual decision-making. Catecholamine levels were manipulated using the clinically relevant drugs methylphenidate and atomoxetine, and their effects were compared with those of citalopram and placebo. Participants performed a classic EEG oddball paradigm that elicits the P3b, a centro-parietal potential that has been shown to trace evidence accumulation, under each of the four drug conditions. We found that methylphenidate and atomoxetine administration shortened RTs to the oddball targets. The neural basis of this behavioral effect was an earlier P3b peak latency, driven specifically by an increase in its buildup rate without any change in its time of onset or peak amplitude. This study provides neurophysiological evidence for the catecholaminergic enhancement of a discrete aspect of human decision-making, that is, evidence accumulation. Our results also support theoretical accounts suggesting that catecholamines may enhance cognition via increases in neural gain.


Assuntos
Encéfalo/fisiologia , Catecolaminas/fisiologia , Tomada de Decisões/fisiologia , Percepção Visual/fisiologia , Adolescente , Inibidores da Captação Adrenérgica/administração & dosagem , Adulto , Cloridrato de Atomoxetina/administração & dosagem , Encéfalo/efeitos dos fármacos , Citalopram/administração & dosagem , Estudos Cross-Over , Tomada de Decisões/efeitos dos fármacos , Inibidores da Captação de Dopamina/administração & dosagem , Método Duplo-Cego , Eletroencefalografia , Potenciais Evocados Visuais/efeitos dos fármacos , Humanos , Masculino , Metilfenidato/administração & dosagem , Pessoa de Meia-Idade , Inibidores Seletivos de Recaptação de Serotonina/administração & dosagem , Percepção Visual/efeitos dos fármacos , Adulto Jovem
9.
J Environ Manage ; 213: 409-416, 2018 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-29505996

RESUMO

Citizen science programs enable community involvement in scientific research. In addition to fostering greater science literacy, some citizen science programs aim to foster engagement in environmental issues. However, few data are available to indicate whether and how citizen science programs can achieve greater environmental engagement. We survey individuals choosing to attend one of seventeen reef citizen science events and examine the extent to which attendees reported three indicators of greater environmental engagement: (i) willingness to share information, (ii) increased support for marine conservation and citizen science, and (iii) intentions to adopt a new behavior. Most participants reported being willing to share information about reef conservation (91%) and described increased support for marine science and conservation (87%). Half of participants (51%) reported intentions to adopt a new conservation behavior. We found that key elements of the citizen science experience associated with these outcomes were learning about actions to protect reefs and coasts (procedural learning), experiencing surprise, and experiencing negative emotions about environmental problems. Excitement was also associated with positive outcomes, but only in participants who were less likely to see themselves as environmental, or were less frequent visitors to reefs and coasts. Importantly, the association between factual learning and environmental engagement outcomes was limited or negative. These findings suggest that the way citizen science experiences make people feel, may be more important for fostering future environmental engagement than factual-based learning. When designing citizen science programs for community members, these findings provide a reminder to not focus on provision of factual information alone, but to highlight environmental impacts while providing meaningful experiences and building environmental skills.


Assuntos
Participação da Comunidade , Conservação dos Recursos Naturais , Humanos , Aprendizagem , Ciência
11.
Malar J ; 13: 221, 2014 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-24902848

RESUMO

Malaria elimination is back on the agenda, but it remains challenging for countries to make the transition from effective control to elimination. Many other infectious diseases have been targeted by globally-coordinated elimination advocacy campaigns, and advocacy has been considered an essential component of the success of other disease elimination programmes. What can the malaria community learn from these successes? A review of infectious disease elimination programmes to identify successful elements of advocacy for disease elimination was undertaken. Key elements are: (i) a global elimination plan, supported by international health bodies; (ii) thorough costings and tools to support the business case; (iii) an approach that is positioned within a development framework; (iv) core elimination advocacy messages; (v) provision of advocacy tools for partners (vi) extensive and effective community engagement; and (vii) strong partnerships. These features provide insights into 'what works' in global elimination advocacy. Advocacy is a powerful tool to support the long-term political and financial commitment necessary for malaria elimination. The global malaria community needs to work together, to ensure that the early steps towards the end goal of malaria elimination are taken.


Assuntos
Erradicação de Doenças/métodos , Malária/epidemiologia , Malária/prevenção & controle , Saúde Global , Humanos
12.
Aust N Z J Psychiatry ; 48(7): 606-16, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24829198

RESUMO

OBJECTIVE: Up to one in five children experience mental health problems. Social and cultural factors may influence emergence of mental health problems. The 21st century has led to changes in many of these factors, but it is unclear whether rates of internalizing and externalizing problems have also changed in recent cohorts of young people. METHODS: A comprehensive literature search was undertaken to locate cohort or population studies that examined changes in mental health of children over time, where participants were aged 18 years and under, and the time frame for change was at least 10 years, with data for at least one time point in the 21st century being statistically compared to at least one time point in the 20th century. Studies were reviewed for quality and outcome. RESULTS: Nineteen studies met criteria for review. These included studies of toddlers, children, and adolescents. Seventeen studies examined internalizing problems, and 11 studies examined externalizing problems. For both children and toddlers, recent cohorts did not exhibit worsening of mental health symptoms. In adolescents, the burden of externalizing problems appear to be stable. However, the majority of studies report an increase in internalizing problems in adolescent girls. The findings for internalizing problems in boys were mixed. CONCLUSIONS: These findings suggest that recent cohorts of adolescent girls are experiencing increases in internalizing symptoms compared to previous cohorts. Approaches for prevention and early intervention should be explored.


Assuntos
Transtornos Mentais/epidemiologia , Adolescente , Fatores Etários , Criança , Pré-Escolar , Feminino , Humanos , Masculino
13.
Australas Psychiatry ; 22(4): 360-365, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24789849

RESUMO

OBJECTIVES: Restrictive interventions (seclusion, physical restraint, and use of acute/p.r.n. sedation) may have negative effects on patients. Identifying factors associated with use of restrictive interventions and examining their effect on admission outcomes is important for optimising inpatient psychiatric care. METHODS: This study documented use of restrictive interventions within a child and adolescent psychiatric inpatient unit for 15 months. Two models examined predictors of use of restrictive interventions: (i) incident characteristics; and (ii) patient characteristics. The relationship between use of restrictive interventions and global clinical outcomes was also examined. RESULTS: Of 134 patients admitted during the study period (61.9% female, mean age=13.8±2.9 years), 26.9% received at least one restrictive intervention. Incident factors associated with restrictive interventions were: physical aggression, early admission stage, and occurrence in private space. Patient factors that predicted use of restrictive interventions were developmental disorder and younger age. Use of restrictive interventions was not associated with increased length of stay or diminished improvement in global symptom ratings. CONCLUSIONS: Further research is needed to identify best practice in children at high risk for receiving restrictive interventions.

14.
J Cogn Neurosci ; 25(4): 649-56, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23163418

RESUMO

Response inhibition, comprising action cancellation and action restraint, and error awareness are executive functions of considerable clinical relevance to neuropsychiatric disorders. Nevertheless, our understanding of their underlying catecholamine mechanisms, particularly regarding dopamine, is limited. Here, we used the dopamine D2 agonist cabergoline to study its ability to improve inhibitory control and modulate awareness of performance errors. A randomized, double-blind, placebo-controlled, crossover design with a single dose of cabergoline (1.25 mg) and placebo (dextrose) was employed in 25 healthy participants. They each performed the stop-signal task, a well-validated measure of action cancellation, and the Error Awareness Task, a go/no-go measure of action restraint and error awareness, under each drug condition. Cabergoline was able to selectively reduce stop-signal RT, compared with placebo, indicative of enhanced action cancellation (p < .05). This enhancement occurred without concomitant changes in overall response speed or RT variability and was not seen for errors of commission on the Error Awareness Task. Awareness of performance errors on the go/no-go task was, however, significantly improved by cabergoline compared with placebo (p < .05). Our results contribute to growing evidence for the dopaminergic control of distinct aspects of human executive ability, namely, action cancellation and error awareness. The findings may aid the development of new, or the repurposing of existing, pharmacotherapy that targets the cognitive dysfunction of psychiatric and neurological disorders. They also provide further evidence that specific cognitive paradigms have correspondingly specific neurochemical bases.


Assuntos
Conscientização , Inibição Psicológica , Desempenho Psicomotor/fisiologia , Receptores de Dopamina D2/metabolismo , Adolescente , Adulto , Conscientização/efeitos dos fármacos , Cabergolina , Agonistas de Dopamina/farmacologia , Método Duplo-Cego , Ergolinas/farmacologia , Humanos , Masculino , Atividade Motora/efeitos dos fármacos , Testes Neuropsicológicos , Desempenho Psicomotor/efeitos dos fármacos , Tempo de Reação/efeitos dos fármacos , Detecção de Sinal Psicológico/efeitos dos fármacos , Fatores de Tempo , Adulto Jovem
15.
Hepatol Commun ; 7(10)2023 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-37695073

RESUMO

BACKGROUND: Bile, which contains bile acids, the natural ligands for farnesoid x receptor (FXR), moves from the liver to the intestine through bile ducts. Ductular reaction often occurs during biliary obstruction. A subset of patients with erythropoietic protoporphyria, an inherited genetic mutation in heme biosynthetic enzyme ferrochelatase, accumulate porphyrin-containing bile plugs, leading to cholestasis. Here, we examined the link between FXR, bile plug formation, and how heme biosynthesis relates to this connection. METHODS: We treated female and male wild-type and global and tissue-specific Fxr knockout mice with a diet containing 3,5-diethoxycarbonyl-1,4-dihydrocollidine, an inhibitor of ferrochelatase, and examined the expression of heme biosynthetic genes. We mined FXR mouse ChIP-Seq data, performed biochemical and histological analysis, and tested HepG2 and primary human hepatocytes after treatment with obeticholic acid, an FXR agonist. RESULTS: We observed that hepatic but not intestinal Fxr loss resulted in reduced bile plugs and ductular reaction in the liver. Then, we examined if FXR plays a regulatory role in heme biosynthesis and found significantly lower porphyrin accumulation in 3,5-diethoxycarbonyl-1, 4-dihydrocollidine-fed Fxr knockout mice. Gene expression and FXR mouse ChIP-Seq atlas analysis revealed that FXR orchestrates the expression of multiple heme biosynthetic enzymes. Finally, human HepG2 cells and primary human hepatocytes treated with obeticholic acid, showed increased expression of several heme biosynthetic genes. CONCLUSIONS: Overall, our data show that hepatic Fxr is necessary to maintain ductular reaction and accumulation of bile plugs. FXR can direct the expression of multiple heme biosynthetic genes. Thus, modulating FXR activity in EPP patients may help alleviate its associated liver disease.


Assuntos
Colestase , Porfirinas , Animais , Feminino , Humanos , Masculino , Camundongos , Ferroquelatase , Heme , Fígado
16.
Australas Emerg Care ; 26(3): 230-238, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-36710228

RESUMO

BACKGROUND: Rates of self-harm and suicide are increasing world-wide, particularly in young females. Emergency departments (EDs) are a common first point-of-contact for young people who self-harm. We examined age- and sex-related differences in: (1) rates of self-harm over an eight-year period; (2) changes in demographic, presentation, and treatment characteristics over this period, and; (3) rates of, and time to, self-harm re-presentation. METHODS: This was a retrospective observational study of all self-harm presentations in persons aged nine years and older to the Royal Melbourne Hospital ED over an eight-year period, 1 January 2012-31 December 2019. The Royal Melbourne Hospital is one of the largest and busiest public EDs in Melbourne, Australia and serves a primary catchment area of approximately 1.5 million people. RESULTS: There were 551,692 presentations to the Royal Melbourne Hospital ED over this period (57.6 % by females). Of these, 7736 (1.4 %) were self-harm related. These self-harm presentations involved 5428 individuals (54.8 % female), giving an overall repetition event-rate of 11.2 %. Self-harm related presentations increased by 5 % per year (Incidence Rate Ratio [IRR 1.05, 95 % CI 1.02-1.08); a 44 % increase over the eight-year period (IRR 1.44, 95 % CI 1.15-1.80). This increase was more pronounced for young people aged< 25 years. The most common method was self-poisoning, primarily by anxiolytics or analgesics. The proportion of presentations involving self-poisoning alone declined modestly over time, whilst the proportion involving self-injury alone increased. For just over half of all presentations the person was seen by ED mental health staff. The median time to first re-presentation was 4.5 months (Inter-Quartile Range [IQR] 0.7-13.2 months). CONCLUSIONS: Rates of hospital presenting self-harm may be increasing, particularly amongst young people, whilst most self-harm presentations occurred outside office hours; so appropriate ED staffing, training and clinical care models are needed. Around half of those with a repeat episode of self-harm repeated within three months of their index (i.e., first recorded) presentation. Efforts to establish appropriate aftercare services, including alternatives to ED services with service availability 24 h a day 7 days a week, aimed at reducing repetition rates, should be prioritised.


Assuntos
Comportamento Autodestrutivo , Suicídio , Humanos , Feminino , Adolescente , Masculino , Vitória/epidemiologia , Comportamento Autodestrutivo/epidemiologia , Comportamento Autodestrutivo/psicologia , Suicídio/psicologia , Hospitais , Serviço Hospitalar de Emergência
17.
Philos Trans R Soc Lond B Biol Sci ; 378(1867): 20210088, 2023 01 02.
Artigo em Inglês | MEDLINE | ID: mdl-36373914

RESUMO

Forest restoration has been proposed as a scalable nature-based solution to achieve global environmental and socio-economic outcomes and is central to many policy initiatives, such as the Bonn Challenge. Restored forests contain appreciable biodiversity, improve habitat connectivity and sequester carbon. Incentive mechanisms (e.g. payments for ecosystem services and allocation of management rights) have been a focus of forest restoration efforts for decades. Yet, there is still little understanding of their role in promoting restoration success. We conducted a systematic literature review to investigate how incentive mechanisms are used to promote forest restoration, outcomes, and the biophysical and socio-economic factors that influence implementation and program success. We found that socio-economic factors, such as governance, monitoring systems and the experience and beliefs of participants, dominate whether or not an incentive mechanism is successful. We found that approximately half of the studies report both positive ecological and socio-economic outcomes. However, reported adverse outcomes were more commonly socio-economic than ecological. Our results reveal that achieving forest restoration at a sufficient scale to meet international commitments will require stronger assessment and management of socio-economic factors that enable or constrain the success of incentive mechanisms. This article is part of the theme issue 'Understanding forest landscape restoration: reinforcing scientific foundations for the UN Decade on Ecosystem Restoration'.


Assuntos
Ecossistema , Motivação , Humanos , Florestas , Biodiversidade , Conservação dos Recursos Naturais
18.
Trends Ecol Evol ; 38(7): 643-653, 2023 07.
Artigo em Inglês | MEDLINE | ID: mdl-36898928

RESUMO

Ecosystem restoration conventionally focuses on ecological targets. However, while ecological targets are crucial to mobilizing political, social, and financial capital, they do not encapsulate the need to: integrate social, economic, and ecological dimensions and systems approaches; reconcile global targets and local objectives; and measure the rate of progress toward multiple and synergistic goals. Restoration is better conceived as an inclusive social-ecological process that integrates diverse values, practices, knowledge, and restoration objectives across temporal and spatial scales and stakeholder groups. Taking a more process-based approach will ultimately enable greater social-ecological transformation, greater restoration effectiveness, and more long-lasting benefits to people and nature across time and place.


Assuntos
Conservação dos Recursos Naturais , Ecossistema , Humanos , Conservação dos Recursos Naturais/métodos , Ecologia
19.
Exp Cell Res ; 316(13): 2087-98, 2010 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-20420826

RESUMO

Adipose tissue is recognized as an endocrine organ that plays an important role in human diseases such as type II diabetes and cancer. Human adipose tissue-derived stem cells (ASCs), a distinct cell population in adipose tissue, are capable of differentiating into multiple lineages including adipogenesis. When cultured in vitro under a confluent condition, ASCs reach a commitment stage for adipogenesis, which can be further induced into terminally differentiated adipocytes by a cocktail of adipogenic factors. Here we report that the confluent state of ASCs triggers transcriptional activation cascades for genes that are responsible for the endocrine function of adipose tissue. These include insulin-like growth factor 1 (IGF-1) and aromatase (Cyp19), a key enzyme in estrogen biosynthesis. Despite similar adipogenic potentials, ASCs from different individuals display huge variations in activation of these endocrine-related genes. Bioinformatics and experimental data suggest that transcription factor Foxo1 controls a large number of "early" confluency-response genes, which subsequently induce "late" response genes. Furthermore, siRNA-mediated knockdown of Foxo1 substantially compromises the ability of committed ASCs to stimulate tumor cell migration in vitro. Thus, our work suggests that cell density is an important determinant of the endocrine potential of ASCs.


Assuntos
Tecido Adiposo/metabolismo , Aromatase/genética , Aromatase/metabolismo , Biomarcadores/metabolismo , Fator de Crescimento Insulin-Like I/genética , Células-Tronco/metabolismo , Ativação Transcricional , Adipogenia/fisiologia , Western Blotting , Contagem de Células , Células Cultivadas , Perfilação da Expressão Gênica , Humanos , Análise de Sequência com Séries de Oligonucleotídeos , RNA Mensageiro/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Células Estromais/metabolismo
20.
J Paediatr Child Health ; 47(6): 350-5, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21309880

RESUMO

AIM: Medication adherence is poor in many young people with chronic illness. However, little research has examined medication adherence in clinic samples of young people receiving psychotropic medication, and whether factors such as disorder or drug type influence adherence. This study aimed to examine medication adherence in children and adolescents receiving psychotropic medication. METHODS: Young people receiving psychotropic medication and their caregivers were recruited from pharmacy and mental health services within a large metropolitan hospital. A brief cross-sectional survey examined medication history, missed doses within the previous week and other clinical information. Multiple regression analysis examined whether child characteristics, drug type and regimen characteristics were associated with medication adherence. RESULTS: Poor adherence was associated with lack of parental involvement in medication routines (P < 0.05), use of complementary medicines (P < 0.01) and difficulty remembering doses (P < 0.01). Developmental diagnoses (P < 0.05), use of antipsychotics (P < 0.05) and use of concomitant non-psychotropic medication (P < 0.05) were predictors of good adherence. CONCLUSION: Encouraging parental involvement in medication routines may be a practical target for clinicians aiming to improve medication adherence in young people. Use of complementary medicines may indicate a group with a higher risk of poorer adherence.


Assuntos
Adesão à Medicação , Transtornos Mentais/tratamento farmacológico , Psicotrópicos/uso terapêutico , Adolescente , Criança , Estudos Transversais , Feminino , Humanos , Masculino , Análise de Regressão , Fatores de Risco
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