RESUMO
Despite the growing interest in the relationship between coping strategies and eudaimonic well-being, few studies have examined this issue from the perspective of coping flexibility. Therefore, the present study aimed to: (1) identify approach coping profiles in the university context and (2) analyze the differences between these profiles in terms of eudaimonic well-being. A prospective ex post facto design was used and 1,402 university students were selected through convenience sampling. Data were collected using validated self-reported instruments. A latent profile analysis was conducted to identify the participants' coping profiles. The relationship between profiles and eudaimonic well-being was determined using a multivariate analysis of covariance (MANCOVA), with gender, age, and university degree as covariates. Six student profiles were identified based on the degree to which they combined positive reappraisal, support seeking, and planning strategies. The profiles that involved the use of these three strategies to a greater extent experienced more eudaimonic well-being, and vice versa. To analyze the impact of coping on eudaimonic well-being, it is necessary to consider students' ability to combine different approach coping strategies.
Assuntos
Adaptação Psicológica , Satisfação Pessoal , Estudantes/psicologia , Adulto , Feminino , Humanos , Masculino , Espanha , Universidades , Adulto JovemRESUMO
Metallosis is a late uncommon complication of knee arthroplasties due to prosthetic loosening or component displacement. Oxinium prosthesis used to have components that attempted and proved to decrease prosthetic wear and consequent metallosis in the past. However, new studies showed that a combination of a shallow anterior tab snap-fit locking mechanism and thin dovetail lips make it susceptible to polyethylene dislocation and prosthesis loosening. The following case report show metallosis development in a 69-year-old female patient with a 20-year history of stage IV left gonarthrosis (Kellgren and Lawrence classification) who underwent a total knee arthroplasty (TKA) with a high-flex PS Genesis II prosthesis (Smith & Nephew, Hertfordshire, UK). We discuss the role of the material and her rheumatoid arthritis background in orthopedic mechanical failure. It is crucial that designers focus on the improvement of locking mechanisms and polyethylene properties.
RESUMO
RATIONALE: Central angiotensin (Ang) II inhibits baroreflex and plays an important role in the pathogenesis of hypertension. However, the underlying molecular mechanisms are still not fully understood. OBJECTIVE: Our objective in the present study was to characterize the signal transduction mechanism of phosphatidylinositol 3-kinase (PI3K) involvement in Ang II-induced stimulation of central neuronal activity in cultured neurons and Ang II-induced inhibition of baroreflex in spontaneously hypertensive rats (SHR) versus WKY rats. METHODS AND RESULTS: Application of Ang II to neurons produced a 42% greater increase in neuronal firing in cells from the SHR than the WKY rat. Although the Ang II-mediated increase in firing rate was abolished entirely by the protein kinase (PK)C inhibitor GF109230 in the WKY, blockade of both PKC and PI3K activity was necessary in the SHR. This was associated with an increased ability of Ang II to stimulate NADPH oxidase-reactive oxygen species (ROS)-mediated signaling involving phosphorylation of the p47phox subunit of the NADPH oxidase and was dependent on the activation of PI3K in the SHR. Inhibition of PI3K resulted in the reduction of levels of p47phox phosphorylation, NADPH oxidase activity, ROS levels, and ultimately neuronal activity in cells from the SHR but not the WKY rat. In addition, in working heart-brainstem preparations, inhibition of PKC activity in the nucleus of the solitary tract in situ abolished the Ang II-mediated depression of cardiac and sympathetic baroreceptor reflex gain in the WKY. In contrast, PKC inhibition in the nucleus of the solitary tract of SHR only partially reduced the effect of Ang II on the baroreceptor reflex gain. CONCLUSIONS: These observations demonstrate that PI3K in the cardiovascular brainstem regions of the SHR may be selectively involved in Ang II-mediated signaling that includes a reduction in baroreceptor reflex function, presumably via a NADPH-ROS mediated pathway.
Assuntos
Angiotensina II/metabolismo , Barorreflexo , Coração/inervação , Hipertensão/enzimologia , Fosfatidilinositol 3-Quinases/metabolismo , Transdução de Sinais , Núcleo Solitário/enzimologia , Sistema Nervoso Simpático/fisiopatologia , Potenciais de Ação , Angiotensina II/administração & dosagem , Animais , Barorreflexo/efeitos dos fármacos , Células Cultivadas , Modelos Animais de Doenças , Hipertensão/fisiopatologia , Microinjeções , NADPH Oxidases/metabolismo , Fosfatidilinositol 3-Quinases/genética , Inibidores de Fosfoinositídeo-3 Quinase , Fosforilação , Proteína Quinase C/antagonistas & inibidores , Proteína Quinase C/metabolismo , Inibidores de Proteínas Quinases/farmacologia , Ratos , Ratos Endogâmicos SHR , Ratos Endogâmicos WKY , Espécies Reativas de Oxigênio/metabolismo , Receptor Tipo 1 de Angiotensina/metabolismo , Reprodutibilidade dos Testes , Transdução de Sinais/efeitos dos fármacos , Núcleo Solitário/efeitos dos fármacos , Núcleo Solitário/fisiopatologia , Sistema Nervoso Simpático/efeitos dos fármacos , Transdução GenéticaRESUMO
RATIONALE: An activated vasoconstrictive, proliferative, and fibrotic axis of the renin angiotensin system (angiotensin-converting enzyme [ACE]/angiotensin [Ang]II/AngII type 1 receptor) has been implicated in the pathophysiology of pulmonary fibrosis (PF) and pulmonary hypertension (PH). The recent discovery of a counterregulatory axis of the renin angiotensin system composed of ACE2/Ang-(1-7)/Mas has led us to examine the role of this vasoprotective axis on such disorders. OBJECTIVES: We hypothesized that Ang-(1-7) treatment would exert protective effects against PF and PH. METHODS: Lentiviral packaged Ang-(1-7) fusion gene or ACE2 cDNA was intratracheally administered into the lungs of male Sprague Dawley rats. Two weeks after gene transfer, animals received bleomycin (2.5 mg/kg). In a subsequent study, animals were administered monocrotaline (MCT, 50 mg/kg). MEASUREMENTS AND MAIN RESULTS: In the PF study, bleomycin administration resulted in a significant increase in right ventricular systolic pressure, which was associated with the development of right ventricular hypertrophy. The lungs of these animals also exhibited excessive collagen deposition, decreased expression of ACE and ACE2, increased mRNA levels for transforming growth factor ß and other proinflammatory cytokines, and increased protein levels of the AT1R. Overexpression of Ang-(1-7) significantly prevented all the above-mentioned pathophysiological conditions. Similar protective effects were also obtained with ACE2 overexpression. In the PH study, rats injected with MCT developed elevated right ventricular systolic pressure, right ventricular hypertrophy, right ventricular fibrosis, and pulmonary vascular remodeling, all of which were attenuated by Ang-(1-7) overexpression. Blockade of the Mas receptor abolished the beneficial effects of Ang-(1-7) against MCT-induced PH. CONCLUSIONS: Our observations demonstrate a cardiopulmonary protective role for the ACE2/Ang-(1-7)/Mas axis in the treatment of lung disorders.
Assuntos
Angiotensina I/genética , Terapia Genética , Hipertensão Pulmonar/prevenção & controle , Fragmentos de Peptídeos/genética , Fibrose Pulmonar/prevenção & controle , Sistema Renina-Angiotensina , Angiotensina I/metabolismo , Enzima de Conversão de Angiotensina 2 , Animais , Bleomicina , Hipertensão Pulmonar/patologia , Masculino , Fragmentos de Peptídeos/metabolismo , Peptidil Dipeptidase A/metabolismo , Proto-Oncogene Mas , Proteínas Proto-Oncogênicas/metabolismo , Fibrose Pulmonar/patologia , Ratos , Ratos Sprague-Dawley , Receptores Acoplados a Proteínas G/metabolismo , Transdução GenéticaRESUMO
Performance in basic and instrumental activities of daily living (ADL; IADL) is an essential indicator of daily functioning and health of people with intellectual disabilities (ID). The aims of this pilot study were to describe the profile of ADL and IADL performance in Spanish adults with ID, and to examine its association with functional physical skills. The Waisman Activities of Daily Living Scale for adolescents and adults with developmental disabilities (W-ADL) scale was administered to the caregivers of twenty adults with ID (mean age = 41.0, SD = 10.1; women = 75.0%). In addition, dynamic balance and maximum walking speed (MWS), lower-body strength, aerobic capacity and manual dexterity of participants were individualized assessed. The results showed that 40% of adults with ID were completely independent in ADL, but all participants reported activity limitations in at least one IADL. Dynamic balance and MWS, lower-body strength and manual dexterity showed significant and moderate-to-strong correlations with daily functioning (r = 0.495-0.814; p < 0.05). Linear regression analysis indicated that lower-body strength and manual dexterity significantly predicted activity performance in adults with ID (adjusted R2 = 0.816, p = 0.004-0.016). This study highlights the need to support the performance of both ADL and IADL and to promote physical fitness in Spanish community-based care centers for adults with ID.
RESUMO
In this study, we compared visual pictorial size perception between healthy volunteers (CG) and an experimental group (EG) of people diagnosed with schizophrenia. We have been using paintings by Salvador Dalí and Rorschach plates to estimate visual pictorial size perception. In this transversal, ex post facto, and quasi-experimental study, we observed differences between EG and CG. Schizophrenic in-patients perceived sizes about 1.3-fold greater than healthy volunteers (p=0.006), implying that pictorial size perception is altered in some way in schizophrenia. Considering the present and previous results, this measurement of diameter size of first pictorial perception may be a useful estimate of some aspects of perceptual alterations that may be associated with psychotic symptoms in prodromal and acute schizophrenic episodes and other related mental states. Eventually, this may help in preventing people from evolving to acute episodes.
RESUMO
BACKGROUND: Depression is one of the world's major health problems. Due to its high prevalence, it constitutes the first cause of disability among the Americas, where only a very low percentage of the population receives the adequate evidence-based psychological treatment. Internet-Based Interventions (IBIs) are a great alternative to reduce the treatment gap for mental disorders. Although there are several studies in low-and middle-income countries proving IBIs' feasibility and acceptability, there is still little evidence of the effectiveness in diverse social and cultural contexts such as Latin America. METHODS: Two studies will be described: Study 1 is focused on the cultural adaptation of a cognitive-behavioral IBI Smiling is Fun (Botella et al. 2012, 2015) for Ecuadorian population with depression based on the procedure by Salamanca-Sanabria et al. (2018). Study 2 describes the design of a randomized controlled trial to test the preliminary efficacy of the culturally adapted intervention in a Public Health Care setting. A total of 153 patients with mild to moderate degree of depression as assessed with the Mini-International Neuropsychiatric Interview (M.I.N.I.) and the Patient Health Questionnaire-9 (PHQ-9) will be randomly assigned to either an IBI group using only automated support by the system; an IBI group including also minimal human support; or a waiting list group. The primary outcome (depression) and secondary outcomes (e.g., anxiety, affect, quality of life) will be collected at baseline, 3, 6 and 12 months. Mixed-model analyses with no ad hoc imputations will be conducted. DISCUSSION: This paper is pioneering in exploring the role of an Internet-based culturally adapted intervention for depression in a public care context in Ecuador. Results obtained will offer new insights into the viability and effectiveness of digital technologies for the psychological treatment of mental illnesses in developing countries.
RESUMO
In daily academic life, students are exposed to a wide range of potentially stressful situations which could negatively affect their academic achievement and their health. Among the factors that could be weakened by academic stress, attention has been paid to expectations of self-efficacy, which are considered one of the most important determinants for student engagement, persistence, and academic success. From a proactive perspective, research on academic stress has emphasized the importance of coping strategies in preventing harmful consequences. In recent years, there has been a growing interest in discovering the extent to which individuals are able to combine different coping strategies and the adaptive consequences this flexibility entails. However, studies using this person-centered approach are still scarce in the academic context. On that basis, this current study had two objectives: (a) to examine the existence of different profiles of university students based on how they combined different approach coping strategies (positive reappraisal, support seeking, and planning) and (b) to determine the existence of differences in general expectations of self-efficacy between those coping profiles. A total of 1,072 university students participated in the study. The coping profiles were determined by latent profile analysis (LPA). The differences in the self-efficacy variable were determined using ANCOVA, with gender, university year, and degree type as covariates. Four approach coping profiles were identified: (a) low generalized use of approach coping strategies; (b) predominance of social approach coping approaches; (c) predominance of cognitive approach coping approaches; and (d) high generalized use of approach coping strategies. The profile showed that a greater combination of the three strategies was related to higher general self-efficacy expectations and vice versa. These results suggest that encouraging flexibility in coping strategies would help to improve university students' self-efficacy.
RESUMO
In keeping with the growth in the development of healthy environments in organizational contexts, in recent years, there has also been increasing interest in the identification of personal psychological resources that contribute to improved worker mental health. From this proactive approach, this study examines the mediating role of flourishing in the relationship between psychological capital (PsyCap) and burnout in teachers, a professional group that is particularly prone to suffering from this syndrome. A total of 1379 teachers from pre-school, primary, secondary, and vocational education systems participated in the study. The mediating effect of flourishing was determined via mediation analysis using the PROCESS macro. The results showed that flourishing partially mediates the negative effect of PsyCap on the three symptoms of burnout (emotional exhaustion, depersonalization, and lack of professional accomplishment). These findings indicate that both PsyCap and flourishing may be effective personal resources in reducing teacher burnout. Therefore, in order to prevent burnout, it is advisable to design interventions that combine PsyCap and flourishing.
Assuntos
Esgotamento Profissional , Pessoal de Educação , Estresse Psicológico , Esgotamento Profissional/epidemiologia , Esgotamento Profissional/psicologia , Estudos Transversais , Pessoal de Educação/psicologia , Humanos , Inquéritos e QuestionáriosRESUMO
The high demands of academia and the fear of failure lead some university students to prioritize defending their personal worth through the use of complex strategies such as self-handicapping or defensive pessimism. Adopting a person-centered approach, this study established two objectives: First, to analyze the conformation of different motivational profiles based on the combination of self-esteem and achievement goals (learning, performance approach, and performance avoidance); and second, to determine if the identified profiles differ from one another in the use of self-handicapping and defensive pessimism. A total of 1028 university students participated in the research. Four motivational profiles were obtained: (a) High self-esteem, low learning goals, high performance approach goals, and high performance avoidance goals; (b) high self-esteem, high learning goals, low performance approach goals, and low performance avoidance goals; (c) low self-esteem, low learning goals, high performance approach goals, and high performance avoidance goals; and (d) low self-esteem, high learning goals, high performance approach goals, and medium performance avoidance goals. Profiles (c) and (d) were significantly related to self-handicapping and defensive pessimism, respectively. These results suggest that students with low self-esteem are more vulnerable to self-protection strategies. Additionally, under self-handicapping and defensive pessimism, the achievement goals are slightly different.
Assuntos
Motivação , Autoimagem , Estudantes/psicologia , Adolescente , Adulto , Feminino , Humanos , Aprendizagem , Masculino , Pessimismo , Universidades , Adulto JovemRESUMO
The benefits of homework on student learning and academic achievement, to a large extent, depend on the degree of student engagement. Motivational engagement (my intention or why I do the homework), cognitive engagement (how I get involved in homework), and behavioral engagement (how much homework I do, how much time I devote to it, how I manage that time) are key aspects that condition the quality of the process of doing homework, learning, and academic achievement. Prior academic achievement is one of the variables that seems to be positively related to student engagement (both due its motivational component and to the training to do homework). The main purpose of this work was to study in detail this relationship in students of the last stage of Primary Education (N = 516). The results showed that (i) as achievement levels rise, the use of a shallow focus to doing homework decreases (and the use of a deep approach increases); (ii) there is also a progressive increase in the amount of homework done and in the management of the time dedicated to homework. On another hand, as in previous research, (iii) no relationship was observed between the levels of prior achievement and the amount of time spent doing homework.
RESUMO
BACKGROUND: Based on a person-centered approach, the aim ofthis study is to identify different profiles of students based on the time they spend on homew he differences between them in the amount of homework done and academic achievement. METHOD: With a sample of 968 students of Primary Education analysis of latent profiles (LPA) and ANOVA were carried out. Once the student profiles were identified, a MANOVA was conducted to analyze the differences between the motivational profiles in the amount of homework assignments done and in academic achievement. RESULTS: We differentiated four profiles of students that differentially combine the time they dedicate to their homework and the use they make of that time. CONCLUSIONS: Of the profiles identified, two can be considered more effective (those that manage time better), and two can be classified as less effective (those that manage time worse). The two profiles that best manage the time spent on homework are also those that do the most homework, and have higher academic achievement. Likewise, the two profiles of students who manage time worst are those who do the least homework, and who have lower academic achievement.
Assuntos
Sucesso Acadêmico , Instituições Acadêmicas/estatística & dados numéricos , Estudantes/estatística & dados numéricos , Gerenciamento do Tempo , Baixo Rendimento Escolar , Análise de Variância , Criança , Feminino , Humanos , Masculino , Espanha , Estudantes/psicologia , Fatores de TempoRESUMO
The interest of assigning homework is frequently discussed due to its alleged low impact on student achievement. One of the current lines of research is to emphasize the quality of student homework engagement rather than the amount of time spent on homework. The aim of this study was to determine (a) the extent to which students' prior achievement affects their homework engagement (i.e., time spent, time management, and amount of teacher-assigned homework done), and (b) how students' intrinsic motivation toward homework may mediate or moderate the relationship between prior achievement and the homework engagement variables. A large sample of students from the first 4 years of Secondary Education (N = 1899) completed questionnaires. The results showed that intrinsic motivation partially mediates, but does not moderate, the effect of prior achievement on the three variables related to homework engagement (time spent, time management, and amount of teacher-assigned homework done). These results highlight the importance of considering both students' current level of achievement and their motivation toward homework engagement when assigning homework.
RESUMO
Abstract In low and middle-income countries such as Brazil, most maternal deaths are related to hypertensive complications. Preeclampsia is the leading cause of maternal mortality and morbidity. Significant proportion is associated with the following factors: lack of identification of high-risk women, lack of adequate prevention, difficulty in maintaining a high-risk prenatal follow-up, delayed diagnosis, insecurity and low use of magnesium sulphate, delayed pregnancy interruption and lack of postpartum follow-up of these high-risk cases. Four major actions are proposed to minimize this alarming clinical picture and reduce the mortality rates due to preeclampsia, called the "4 P Rule" (Adequate Prevention - Vigilant Prenatal Care - Timely Delivery (Parturition) - Safe Postpartum). From this simple "rule" we can open a range of important processes and reminders that may help in the guidance of preeclampsia management.
Assuntos
Humanos , Feminino , Gravidez , Pré-Eclâmpsia , Complicações na Gravidez , Aspirina , Cálcio , Hipertensão Induzida pela Gravidez , HipertensãoRESUMO
The importance of personal psychological resources in preventing academic stress has enjoyed little attention to date, despite the high rates of stress that exist among university students. This article analyzes the effect of eudaimonic well-being on the use of adaptive strategies for coping with academic stress. Moreover, it analyzes the role of self-efficacy as a mediator and moderator of this relationship. In the mediation model, gender is included as a co-variable; in the moderation model, gender is included as a moderator. A total of 1402 university students participated in the study. The data were gathered through validated self-report instruments. The mediation analyses were performed using the PROCESS module of the statistical package, SPSS. The moderating effects of self-efficacy and gender were analyzed through hierarchical regression analysis. The results indicate that self-efficacy partially mediates but does not moderate the relationship between eudaimonic well-being and adaptive coping strategies. This finding reveals the benefits of using these two personal resources to enhance effective coping with academic stress while attending university.
Assuntos
Adaptação Psicológica , Autoeficácia , Estudantes/psicologia , Adolescente , Adulto , Emoções , Feminino , Humanos , Masculino , Estresse Psicológico , Universidades , Adulto JovemRESUMO
Macrophage migration inhibitory factor (MIF) acts intracellularly to counteract the angiotensin (ANG) II type 1 receptor (AT1-R)-mediated chronotropic effect of ANG II in hypothalamic neurons, an effect mediated by the thiol-protein oxidoreductase (TPOR) activity of the MIF molecule. Here we determined the in vivo actions of MIF in regulating the physiological actions of ANG II that are mediated via the paraventricular nucleus (PVN), an area that serves as a relay point in the central nervous system (CNS)-mediated effects of ANG II on cardiovascular functions and water intake. Intracerebroventricular (icv) injection of ANG II into normotensive rats selectively increased MIF protein levels in the PVN and produced significant pressor and drinking responses that were inhibited by PVN administration of the AT1-R antagonist losartan. Overexpression of MIF in PVN neurons via Ad-Syn-MIF gene transfer attenuated the pressor and drinking responses produced by icv-injected ANG II. Consistently, intracellular application of MIF or MIF-(50-65) (which harbors the TPOR activity of MIF) into PVN sympathetic regulatory neurons, blunted the electrophysiological actions of ANG II at these cells. These observations establish for the first time that MIF within the PVN, acting via TPOR, is an intracellular regulator of the central cardiovascular and dipsogenic effects of ANG II.
Assuntos
Angiotensina II/farmacologia , Fatores Inibidores da Migração de Macrófagos/farmacologia , Núcleo Hipotalâmico Paraventricular/fisiologia , Angiotensina II/administração & dosagem , Animais , Barorreflexo/efeitos dos fármacos , Sistema Cardiovascular/efeitos dos fármacos , Ingestão de Líquidos/efeitos dos fármacos , Técnicas de Transferência de Genes , Fatores Inibidores da Migração de Macrófagos/análise , Fatores Inibidores da Migração de Macrófagos/genética , Masculino , Neurônios/efeitos dos fármacos , Neurônios/fisiologia , Núcleo Hipotalâmico Paraventricular/citologia , Ratos , Ratos Sprague-Dawley , Ratos Wistar , Receptor Tipo 1 de Angiotensina/fisiologiaRESUMO
Objetivo: Avaliar o perfil clínico e epidemiológico das mortes maternas ocorridas em uma maternidade pública de Manaus no período de janeiro de 2016 a dezembro de 2019. Métodos: Trata-se de um estudo do tipo descritivo e retrospectivo realizado a partir de dados contidos em prontuários médicos do Serviço de Arquivo Médico e Estatística (SAME) da Maternidade Ana Braga na cidade de Manaus-AM. A amostra foi constituída por pacientes admitidas na Maternidade Ana Braga e que evoluíram com óbito no ciclo gravídico puerperal, que consiste em grávidas, em trabalho de parto, que deram à luz ou que abortaram dentro de um período de até 42 dias. Resultados: Foram avaliados 29 prontuários de pacientes que foram a óbito no ciclo gravídico puerperal. Essas mulheres tinham entre 14 e 42 anos de idade. Quanto à escolaridade, 56,3% delas tinham ensino médio. Quanto à etnia, as mulheres negras e pardas representaram a maioria, as solteiras, o maior percentual. No óbito materno, observou-se que 10 mulheres realizaram menos de seis consultas pré-natal, a principal via de parto foi a cesariana e o choque séptico foi o mais prevalente como causa de morte. Conclusão: Esse resultado sugere a necessidade de avaliação do acesso oportuno das gestantes à assistência pré-natal, ao parto e ao puerpério adequada, além de melhorias na promoção de políticas públicas que busquem a redução da mortalidade materna.(AU)
Objective: To evaluate the clinical and epidemiological profile of maternal deaths that occurred in a public maternity hospital in Manaus from January 2016 to December 2019. Methods: This is a descriptive and retrospective study carried out based on data contained in medical records doctors from the Medical Archive and Statistics Service (SAME) of the Ana Braga Maternity Hospital in the city of Manaus-AM. The sample consisted of patients admitted to the Ana Braga Maternity Hospital and who died in the pregnancy-puerperal cycle, which consists of pregnant women, in labor, who gave birth or who aborted within a period of up to 42 days. Results: Were evaluated 29 records of patients who died in the pregnancy-puerperal cycle, these women were between 14 and 42 years old, and 56.3% had high school education. As for ethnicity, black and brown women represented the majority, single women the highest percentage. In maternal death, it was observed that 10 women had less than six prenatal consultations, the main mode of delivery was cesarean section and septic shock was the most prevalent cause of death. Conclusion: This result suggests the need to assess the timely access of pregnant women to adequate prenatal care, childbirth and postpartum care, in addition to improvements in the promotion of public policies that seek to reduce maternal mortality.(AU)
Assuntos
Humanos , Feminino , Gravidez , Mortalidade Materna , Causas de Morte , Choque Hemorrágico/mortalidade , Choque Séptico/mortalidade , Perfil de Saúde , Brasil/epidemiologia , Prontuários Médicos/estatística & dados numéricos , Epidemiologia Descritiva , Estudos Retrospectivos , Saúde da Mulher , Gravidez de Alto RiscoRESUMO
Recently discovered, angiotensin-converting enzyme-2 (ACE2) is an important therapeutic target in the control of cardiovascular diseases as a result of its proposed central role in the control of angiotensin peptides. Thus our objective in the present study was to determine whether ACE2 gene transfer could decrease high blood pressure (BP) and would improve cardiac dysfunctions induced by hypertension in the spontaneously hypertensive rat (SHR) model. Five-day-old SHR and normotensive WKY rats received a single intracardiac bolus injection of lentiviral vector containing either murine ACE2 (ACE2) or control enhanced green fluorescent protein (EGFP) genes. Systolic BP, cardiac functions, and perivascular fibrosis were evaluated 4 mo after ACE2 gene transduction. ACE2 gene transfer resulted in a significant attenuation of high BP in the SHR (149 +/- 2 mmHg in lenti-ACE2 vs. 180 +/- 9 mmHg in lenti-EGFP, P < 0.01). In contrast, no significant effect of lenti-ACE2 on BP of WKY rats was observed. Lenti-ACE2-treated SHR showed an 18% reduction in left ventricular wall thickness (1.52 +/- 0.04 vs. 1.86 +/- 0.04 mm in lenti-EGFP, P < 0.01). In addition, there was a 12% increase in left ventricular end diastolic and a 21% increase in end systolic diameters in lenti-ACE2-treated SHR. Finally, lenti-ACE2 treatment resulted in a significant attenuation of perivascular fibrosis in the SHR. In contrast, ACE2 gene transfer did not influence any of these parameters in WKY rats. These observations demonstrate that ACE2 overexpression exerts protective effects on high BP and cardiac pathophysiology induced by hypertension in the SHR.
Assuntos
Hipertensão/terapia , Peptidil Dipeptidase A/genética , Fosfatase Alcalina/genética , Enzima de Conversão de Angiotensina 2 , Animais , Pressão Sanguínea , Fibrose , Ventrículos do Coração/patologia , Hipertensão/patologia , Hipertensão/fisiopatologia , Imageamento por Ressonância Magnética , Camundongos , Miocárdio/enzimologia , Miócitos Cardíacos/enzimologia , Peptidil Dipeptidase A/metabolismo , Ratos , Ratos Endogâmicos SHR , Ratos Endogâmicos WKY , Transdução GenéticaRESUMO
The role of soluble epoxide hydrolase (sEH) in the central control of blood pressure (BP) has not been elucidated in spite of peripheral sEH overexpression being linked to hypertension. Thus, our objective was to investigate the involvement of brain sEH in BP control. sEH expression in the hypothalamus and brain stem, two cardioregulatory brain areas, was increased in the spontaneously hypertensive rat (SHR) compared to the Wistar Kyoto (WKY) rat. Inhibition of the enzyme by intracerebroventricular (icv) delivery of AUDA further increased both BP and heart rate (HR) by 32 +/- 6 mmHg and 54 +/- 10 bpm, respectively, (P<0.05) in the SHR. Analysis of waveform telemetry data revealed a decrease in spontaneous baroreceptor reflex gain following sEH inhibition, indicating the sustained increase in BP may be due to a decrease in baroreceptor reflex function. The hypertensive effect of sEH inhibition is likely a result of an increase in epoxyeicosatrienoic acid (EET)-mediated generation of ROS. This view is supported by the following: 1) Inhibition of EET formation attenuates AUDA-induced increase in BP; 2) delivery of an EET agonist increases BP and HR in the WKY rat, and 3) inhibition of NAD(P)H oxidase by gp91ds-tat prevents AUDA-induced increases in BP and HR. Finally, electrophysiological studies demonstrate that AUDA increased neuronal firing rate exclusively in the SHR, an effect completely abolished by gp91ds-tat. These observations suggest that EETs and sEH inhibition are involved in increasing BP in the SHR. We suggest that an increased expression of sEH is a futile central nervous system response in protection against hypertension.
Assuntos
Ácido 8,11,14-Eicosatrienoico/análogos & derivados , Pressão Sanguínea/fisiologia , Encéfalo/enzimologia , Epóxido Hidrolases/metabolismo , Homeostase/fisiologia , Hipertensão/enzimologia , Ácido 8,11,14-Eicosatrienoico/metabolismo , Animais , Barorreflexo/fisiologia , Western Blotting , Tronco Encefálico/citologia , Células Cultivadas , Epóxido Hidrolases/genética , Frequência Cardíaca , Hipertensão/fisiopatologia , Hipotálamo/citologia , Masculino , Neurônios/fisiologia , RNA Mensageiro/análise , Ratos , Ratos Endogâmicos SHR , Ratos Endogâmicos WKY , Espécies Reativas de Oxigênio/metabolismo , Reação em Cadeia da Polimerase Via Transcriptase Reversa , SolubilidadeRESUMO
In highly competitive settings like university, the fear of failure leads some students to protect their self-worth using self-handicapping strategies. The present investigation examines to what extent academic goals are related to those tactics in university students. Specifically, MANCOVA was applied to estimate statistical differences linked to behavioral and claimed self-handicapping strategies according to the level (high/medium/low) of four types of academic goal (achievement approach, achievement avoidance, mastery approach, and work avoidance). Degree, year in school, and gender were entered as covariates. 940 students (86.5% women) from University of A Coruña (M = 20.44; SD = 1.73) participated. Results show that: (a) both behavioral and claimed self-handicapping are promoted by ego-oriented goals (achievement avoidance, F(2, 937) = 23.56, p < .001, η p 2 = .048; achievement approach, F(2, 937) = 7.49, p < .001, η p 2 = .016); (b) work avoidance goals are related to behavioral self-handicapping (F(2, 937) = 9.09, p < .001, η p 2 = .019), but are not statistically linked to claimed self-handicapping; and (c) mastery approach goals are significantly, negatively related to both types of self-handicapping (F(2, 937) = 20.09, p < .001, η p 2 = .041). Psychological and educational implications of the findings are discussed.