Comparison of arterial stiffness index predictors in perimenopausal and postmenopausal women.

The present cross-sectional study aimed to compare climacteric symptoms and arterial stiffness indices between perimenopausal and postmenopausal women. The study sample comprised 70 healthy female participants, including 27 perimenopausal (49.8 ± 3.8 years) and 43 postmenopausal (55.7 ± 4 years) individuals. Validated methods were used to assess physical activity level, quality of life, climacteric symptoms, and anthropometric data. Arterial stiffness parameters were measured using Mobil-O-Graph. Pulse wave velocity (PWV) had a higher mean in the postmenopausal group than in the perimenopause group [8.04 m/s (SD 0.79) vs 7.01 m/s (SD 0.78), p < .001). PWV was strongly correlated with peripheral (r = 0.619) and central (r = 0.632) Systolic Blood Pressure (SBP) in postmenopausal group and an even stronger correlation was observed in perimenopausal group (r = 0.779 pSBP and 0.782 cSBP). BMI was a risk predictor in the perimenopausal group contributing positively to increase Pulse Pressure Amplification (PPA) (0.458, p < .05). In postmenopausal women, heart rate (HR) was a stronger predictor for central SBP, cardiac output, and total vascular resistance, whereas perimenopausal women HR influenced central diastolic blood pressure and PPA. Vascular changes initiating during perimenopause may contribute to the development of cardiovascular pathologies in the postmenopausal period. Further research with larger, representative samples is warranted to corroborate these findings.

Effect of ovariectomy and high-fat diet on the expression of estrogen receptors and adipose tissue metabolism in wistar rats.

This study addresses the increasing prevalence of obesity, especially among postmenopausal. Estrogen plays a crucial role in regulating adipose tissue in women, with its absence after menopause associated with metabolic complications. The study aimed to determine the lipolytic activity in different adipose tissue depots of ovariectomized rats submitted to a high-fat diet. Also, to analyze the expression of estrogen receptors in adipose tissues and perform histological and morphometric analyzes of these deposits. Female rats were ovariectomized (O) or sham operated (S). The animals were divided into groups: ovariectomized with high-fat diet (OF), sham-operated with high-fat diet (SF), ovariectomized with control diet (OC) or sham-operated with control diet as the control group (SC). After 24 weeks of consuming the diets, rats were killed and adipose tissue deposits were removed. Polymerase chain reaction was performed to analyze the expression of estrogen receptors in adipose tissues, lipolysis assay and histological analysis. Both the high-fat diet and ovariectomy increased body weight and adiposity. There was hypertrophy of adipocytes. Estrogen replacement therapy modulate lipolytic activity in different adipose depots, with different responses in relation to estrogen receptors. Estrogen receptor expression varied between fat depots. Mesenteric adipose tissue showed greater sensitivity to estrogen compared with others. Estrogen increased lipolytic activity in some fat depots, reducing in others. Expression of ERs depends of hormonal status and adipose tissue location, which may explain distinct actions of estrogen on the metabolism of adipose tissue and on the production of adipokines by them.

Arterial stiffness indices, pulse wave velocity and central systolic blood pressure, are able to discriminate between obese and non-obese children.

The objectives of this study were to verify, first, if arterial stiffness indices can discriminate between obese and healthy children. Second, to evaluate arterial stiffness index predictors and hemodynamic parameters in obese children. Arterial stiffness indices evaluated were pulse wave velocity (PWV), central systolic blood pressure (SBPc), and central pulse pressure (PPc). A cross-sectional, descriptive, comparative study design was used. The sample consisted of 78 normal-weight children (8.1 ± 1.96 years) and 58 obese children (9.0 ± 1.87 years). PWV, PPc, and SBPc were significantly higher in the group of obese children than in the control group. The ROC curve analysis showed that maximum PWV and SBPc sensitivity and specificity in differentiating obese from non-obese children occurred at 4.09 m/s and 86.17 mmHg, respectively. PPc did not exhibit a discriminatory capacity between the two groups. Peripheral systolic blood pressure (SBPp), peripheral pulse pressure (PPp), and PPc (R2 = 0.98) were predictors of increased PWV. Augmentation pressure, PPp, and reflection coefficient (R2 = 0.873) were predictors of PPc. Age, augmentation index, total vascular resistance, cardiac index, and mean fat percentage (R2 = 0.801) were predictors of SBPc. CONCLUSION: This study shows for the first time that PWV > 4.09 m/s and SBPc > 86.17 mmHg are cut-off points associated with a higher risk of obesity. These results indicate that the simple, rapid, and noninvasive measurement of arterial stiffness adds prognostic information regarding cardiovascular risk, in addition to increased body mass index. WHAT IS KNOWN: • Overweight and obesity are strongly associated with comorbidities que contribute to the development of cardiovascular diseases. WHAT IS NEW: • This is the first study to show that PWV and SBPc can discriminate obese from non-obese children. These results show that, in addition to an increased BMI, a simple, rapid, and noninvasive measurement of arterial stiffness adds prognostic information on cardiovascular risk.

Knowledge and practice of nursing in sickle cell disease and hemoglobinopathies in primary care / Conocimiento y práctica de enfermería en el cuidado de la enfermedad de células falciformes y hemoglobinopatías en la atención primaria / Conhecimento e prática de enfermagem no atendimento à doença falciforme e hemoglobinopatias na atenção primária

ABSTRACT Objective: to investigate the level of knowledge of nurses in Basic Health Units and their engagement in monitoring patients with sickle cell disease and other hemoglobinopathies. Methods: this is a qualitative, descriptive-exploratory study, carried out with 12 nurses from basic health units in the municipality of Santa Luzia/Minas Gerais between August 2018 and February 2019. The semi-structured interview was the technique used for data collection, which was analyzed using Content Analysis. Results: the analysis of the interviews emerged in the construction of three categories: understanding of sickle cell disease, risk factors, and alterations on physical examination; nursing care at the health unit according to the recommendation of the Ministry of Health; obstacles and facilitators for the tracking and identification of patients. Discourse analysis highlighted: the outstanding presence of misconceptions regarding sickle cell disease; the absence of effective follow-up of patients in the area covered by the nurse; and the non-existence of a positive sickle cell disease patient link with primary care. Conclusion: although nursing plays a fundamental role in monitoring and assisting patients with sickle cell disease, the study revealed a significant gap between care recommendations and practice in basic health units.

RESUMEN Objetivo: investigar el nivel de conocimiento de los enfermeros de las Unidades Básicas de Salud y su participación en el seguimiento de pacientes con enfermedad de células falciformes y otras hemoglobinopatías. Método: se trata de un estudio cualitativo descriptivo-exploratorio, realizado con 12 enfermeros de unidades básicas de salud de la ciudad de Santa Luzia/Minas Gerais entre agosto de 2018 y febrero de 2019. La entrevista semiestructurada fue la técnica utilizada para la recolección de datos, que fueron analizados mediante el Análisis de Contenido. Resultados: el análisis de las entrevistas emergió en la construcción de tres categorías: comprensión sobre la enfermedad de células falciformes, factores de riesgo y alteraciones en el examen físico; atención de enfermería en la unidad de salud según recomendación del Ministerio de salud; obstáculos y facilitadores para el seguimiento e identificación de pacientes. El análisis del discurso destacó: la marcada presencia de conceptos erróneos en relación con la enfermedad de células falciformes; la falta de seguimiento efectivo de los pacientes en el área cubierta por la enfermera; y la inexistencia de un vínculo positivo entre el paciente y la enfermedad células falciformes con atención primaria. Conclusiones: si bien la enfermería tiene un papel fundamental en la conducción del seguimiento y atención de los pacientes con enfermedad de células falciformes, el estudio reveló una brecha significativa entre las recomendaciones de atención y la práctica en las unidades básicas de salud.

RESUMO Objetivos: investigar o nível de conhecimento dos enfermeiros das Unidades Básicas de Saúde e o engajamento destes no acompanhamento de pacientes com doença falciforme e outras hemoglobinopatias. Métodos: este é um estudo qualitativo descritivo-exploratório, realizado com 12 enfermeiros de unidades básicas de saúde do município de Santa Luzia/Minas Gerais entre agosto de 2018 a fevereiro de 2019. A entrevista semiestruturada foi a técnica utilizada para coleta de dados, as quais foram analisadas usando a Análise de Conteúdo. Resultados a análise das entrevistas emergiu na construção de três categorias: compreensão sobre a doença falciforme, fatores de risco e alterações ao exame físico; assistência do enfermeiro na unidade de saúde segundo a recomendação do Ministério da Saúde; dificultadores e facilitadores para o rastreamento e identificação dos pacientes. A análise do discurso destacou: a presença marcante de conceitos equivocados em relação à doença falciforme; a ausência de acompanhamento efetivo dos pacientes da área de abrangência do enfermeiro; e a não existência de vínculo entre paciente com doença falciforme positivo e a atenção básica ou uma lacuna significativa entre as recomendações de cuidado e a prática nas unidades básicas de saúde. Conclusão: embora a enfermagem desempenhe um papel fundamental no monitoramento e na assistência aos pacientes com doença falciforme, o estudo revelou uma lacuna significativa entre as recomendações de cuidados e a prática nas unidades básicas de saúde.

Factors associated with accidents involving biological material among health professionals.

Introduction: Accidents with biological material and cuting/piercing instruments among health professionals have led to increased rates of hospital infection and subsequent patient contamination. Objectives: To compare factors associated with accidents involving biological material among health workers. Methods: This cross-sectional epidemiological study, conducted in 2019-2020, included 229 physicians and non-physicians. Results: The sample was 60.7% physicians and 39.3% non-physicians; 51.5% were women; 48.5% were aged ≥40 years; 55% lived with a partner; 57.6% had a specialist or graduate degree; and 51.5% had ≥ 1 child). he physician group had a higher education level, worked > 1 job, and had a high rate of accidents, in addition to lower rates of pre-employment examinations, specific accident training, and supervisor contact in case of accidents. There was also a positive association in the physician group between accidents, employment length, and operating room experience, while age was inversely correlated with accident risk. Conclusions: Different worker categories had specific risk profiles that involved education level, employment length, a low notification level, and risk underestimation. The results showed that education level and employment length do not guarantee accidents prevention. Both the physician and non-physician groups had significant accident rates and a similar behavior profile when events occurred, including low notification rates and underestimating the risk involved in the accident.

Introdução: Acidentes envolvendo material biológico com instrumentos cortantes e perfurantes entre profissionais de saúde têm sido causa de aumento de infecção hospitalar e, portanto, de contaminação do paciente. Objetivos: Comparar fatores associados ao acidente com material biológico em trabalhadores da saúde. Métodos: Estudo epidemiológico transversal envolvendo 229 profissionais, médicos e não médicos (2019-2020). Resultados: A amostra total foi composta por 229 profissionais (48,1% médicos, 51,9% não médicos, 51,5% mulheres, 48,5% ≥ 40 anos, 55% viviam com companheiro, 57,6% tinham nível educacional de especialização/pós-graduação, 51,5% ≥ um filho). Os profissionais médicos apresentaram maior escolaridade, mais de um emprego e maior proporção de ocorrência de acidentes, bem como menor proporção de exames admissionais, treinamentos específicos e contato com supervisor em casos de acidentes. Ainda, os profissionais médicos apresentaram associação positiva dos acidentes com o tempo de trabalho e o tempo de experiência no bloco cirúrgico, enquanto a idade apresentou relação inversa com as chances de acidentes. Conclusões: Diferentes categorias de trabalho apresentaram perfil específico de riscos envolvendo estudo e tempo de serviço, baixa notificação e risco subestimado. Os resultados deste estudo mostraram que o nível de estudo e o tempo de serviço não foram capazes de garantir a prevenção de acidentes envolvendo material biológico. Além disso, profissionais médicos e não médicos apresentaram não apenas uma incidência significativa de acidentes, mas também um perfil de comportamento semelhante diante do evento, com baixa notificação e risco subestimado do acidente.

Norepinephrine modulation of heat dissipation in female rats lacking estrogen.

Postmenopausal hot flushes are caused by lack of estradiol (E2) but their neuroendocrine basis is still poorly understood. Here, we investigated the interrelationship between norepinephrine and hypothalamic neurons, with emphasis on kisspeptin neurons in the arcuate nucleus (ARC), as a regulatory pathway in the vasomotor effects of E2. Ovariectomized (OVX) rats displayed increased tail skin temperature (TST), and this increase was prevented in OVX rats treated with E2 (OVX + E2). Expression of Fos in the hypothalamus and the number of ARC kisspeptin neurons coexpressing Fos were increased in OVX rats. Likewise, brainstem norepinephrine neurons of OVX rats displayed higher Fos immunoreactivity associated with the increase in TST. In the ARC, the density of dopamine-ß-hydroxylase (DBH)-immunoreactive (ir) fibers was not altered by E2 but, importantly, DBH-ir terminals were found in close apposition to kisspeptin cells, revealing norepinephrine inputs to ARC kisspeptin neurons. Intracerebroventricular injection of the α2-adrenergic agonist clonidine (CLO) was used to reduce central norepinephrine release, confirmed by the decreased 3-methoxy-4-hydroxyphenylglycol/norepinephrine ratio in the preoptic area and ARC. Accordingly, CLO treatment in OVX rats reduced ARC Kiss1 mRNA levels and TST to the values of OVX + E2 rats. Conversely, CLO stimulated Kiss1 expression in the anteroventral periventricular nucleus (AVPV) and increased luteinizing hormone secretion. These findings provide evidence that augmented heat dissipation in OVX rats involves the increase in central norepinephrine that modulates hypothalamic areas related to thermoregulation, including ARC kisspeptin neurons. This neuronal network is suppressed by E2 and its imbalance may be implicated in the vasomotor symptoms of postmenopausal hot flushes.

Alamandine improves cardiac remodeling induced by transverse aortic constriction in mice.

Alamandine is the newest identified peptide of the renin-angiotensin system (RAS) and has protective effects in the cardiovascular system. Although the involvement of classical RAS components in the genesis and progression of cardiac remodeling is well known, less is known about the effects of alamandine. Therefore, in the present study we investigated the effects of alamandine on cardiac remodeling induced by transverse aortic constriction (TAC) in mice. Male mice (C57BL/6), 10-12 wk of age, were divided into three groups: sham operated, TAC, and TAC + ALA (30 µg/kg/day alamandine for 14 days). The TAC surgery was performed under ketamine and xylazine anesthesia. At the end of treatment, the animals were submitted to echocardiographic examination and subsequently euthanized for tissue collection. TAC induced myocyte hypertrophy, collagen deposition, and the expression of matrix metalloproteinase (MMP)-2 and transforming growth factor (TGF)-ß in the left ventricle. These markers of cardiac remodeling were reduced by oral treatment with alamandine. Western blotting analysis showed that alamandine prevents the increase in ERK1/2 phosphorylation and reverts the decrease in 5'-adenosine monophosphate-activated protein kinase (AMPK)α phosphorylation induced by TAC. Although both TAC and TAC + ALA increased SERCA2 expression, the phosphorylation of phospholamban in the Thr17 residue was increased solely in the alamandine-treated group. The echocardiographic data showed that there are no functional or morphological alterations after 2 wk of TAC. Alamandine treatment prevents myocyte hypertrophy and cardiac fibrosis induced by TAC. Our results reinforce the cardioprotective role of alamandine and highlight its therapeutic potential for treating heart diseases related to pressure overload conditions.NEW & NOTEWORTHY Alamandine is the newest identified component of the renin-angiotensin system protective arm. Considering the beneficial effects already described so far, alamandine is a promising target for cardiovascular disease treatment. We demonstrated for the first time that alamandine improves many aspects of cardiac remodeling induced by pressure overload, including cell hypertrophy, fibrosis, and oxidative stress markers.

17-ß-Estradiol increases macrophage activity through activation of the G-protein-coupled estrogen receptor and improves the response of female mice to Cryptococcus gattii.

Cryptococcus gattii (Cg) is one of the agents of cryptococcosis, a severe systemic mycosis with a higher prevalence in men than women, but the influence of the female sex hormone, 17-ß-estradiol (E2), on cryptococcosis remains unclear. Our study shows that female mice presented delayed mortality, increased neutrophil recruitment in bronchoalveolar lavage fluid, and reduced fungal load after 24 hr of infection compared to male and ovariectomised female mice (OVX). E2 replacement restored OVX female survival. Female macrophages have more efficient fungicidal activity, which was increased by E2 and reversed by the antagonist of G-protein-coupled oestrogen receptor (GPER), which negatively modulates PI3K activation. Furthermore, E2 induces a reduction in Cg cell diameter, cell charge, and antioxidant peroxidase activity. In conclusion, female mice present improved control of Cg infection, and GPER is important for E2 modulation of the female response.

Genetic deletion of the alamandine receptor MRGD leads to dilated cardiomyopathy in mice.

We have recently described a new peptide of the renin-angiotensin system, alamandine, a derivative of angiotensin-(1-7). Mas-related G protein-coupled receptor member D (MrgD) was identified as its receptor. Although similar cardioprotective effects of alamandine to those of angiotensin-(1-7) have been described, the significance of this peptide in heart function is still elusive. We aimed to evaluate the functional role of the alamandine receptor MrgD in the heart using MrgD-deficient mice. MrgD was localized in cardiomyocytes by immunofluorescence using confocal microscopy. High-resolution echocardiography was performed in wild-type and MrgD-deficient mice (2 and 12 wk old) under isoflurane anesthesia. Standard B-mode images were obtained in the right and left parasternal long and short axes for morphological and functional assessment and evaluation of cardiac deformation. Additional heart function evaluation was performed using Langendorff isolated heart preparations and inotropic measurements of isolated cardiomyocytes. Immunofluorescence indicated that the MrgD receptor is expressed in cardiomyocytes, mainly in the membrane and perinuclear and nuclear regions. Echocardiography showed left ventricular remodeling and severe dysfunction in MrgD-deficient mice. Strikingly, MrgD-deficient mice presented a pronounced dilated cardiomyopathy with a marked decrease in systolic function. Echocardiographic changes were supported by the data obtained in isolated hearts and inotropic measurements in cardiomyocytes. Our data add new evidence for a major role for alamandine/MrgD in the heart. Furthermore, our results indicate that we have identified a new gene implicated in dilated cardiomyopathy, unveiling a new target for translational approaches aimed to treat heart diseases. NEW & NOTEWORTHY The renin-angiotensin system is a key target for cardiovascular therapy. We have recently identified a new vasodepressor/cardioprotective angiotensin, alamandine. Here, we unmasked a key role for its receptor, Mas-related G protein-coupled receptor member D (MrgD), in heart function. The severe dilated cardiomyopathy observed in MrgD-deficient mice warrants clinical and preclinical studies to unveil its potential use in cardiovascular therapy.

Effect of physical exercise on cardiometabolic parameters in post-menopause: an integrative review / Efeito do exercício físico nos parâmetros cardiometabólicos na pós-menopausa: revisão integrativa

Abstract Objective: To identify the evidence available in literature which relates the practice of physical exercise to improvements in the cardiovascular and metabolic parameters of postmenopausal women. Method: A search was performed of works published between 2008 and 2018 included in the MEDLINE, BDENF, IBCS and LILACS databases. Of the 792 studies identified, 23 met the inclusion criteria. Results: Following analysis, the studies were separated into three categories. In the first category it was observed that physical exercise improved lipid metabolism, reduced abdominal circumference and promoted weight loss. The second category revealed that physical exercise reduced systolic blood pressure, prevented the development of arterial hypertension and reduced the release of sympathomimetic hormones. In the third category the studies indicated that physical exercise elevated the antioxidant mediators and reversed the oxidative stress involved in the inflammatory reactions present in cardiovascular diseases. Conclusion: The studies confirm the beneficial effects of physical exercise on the metabolic and cardiovascular parameters of postmenopausal women.

Resumo Objetivo: Identificar as evidências disponíveis na literatura que relacionam a prática do exercício físico com a melhora dos parâmetros cardiovasculares e metabólicos em mulheres na pós-menopausa. Método: Foi realizada busca nas bases de dados MEDLINE, BDENF, IBCS e LILACS de trabalhos publicados entre 2008 a 2018. Dos 792 estudos identificados, 23 preencheram os critérios de inclusão. Resultados: A análise dos estudos permitiu a separação em três categorias. Na primeira categoria foi observado que o exercício físico melhorou o metabolismo lipídico, reduziu a circunferência abdominal e promoveu perda de peso. A segunda categoria evidenciou que o exercício físico reduziu a pressão arterial sistólica, preveniu o desenvolvimento de hipertensão arterial e reduziu liberação de hormônios simpatomiméticos. Na terceira categoria os estudos indicaram que o exercício físico eleva os mediadores antioxidantes e reverte o stress oxidativo envolvido nas reações inflamatórias presentes em doenças cardiovasculares. Conclusão: Os estudos afirmam efeitos benéficos do exercício físico sobre os parâmetros metabólicos e cardiovasculares de mulheres na pós-menopausa.

Age-related changes in vascular responses to angiotensin-(1-7) in female mice.

The vasodilatory effect of angiotensin-(1-7) seems to vary between sexes, and estradiol (E2) can modulate the magnitude of the Ang-(1-7) vasodilatory response in female rats. However, there are few studies addressing the influence of sex on the age-related vasodilatory effect of Ang-(1-7). Here, we evaluated the vasodilatory response to Ang-(1-7) on vascular ageing. Ang-(1-7) dose-response curves were determined in mice aortic rings from males (old and young) and females (E2 treated/non-treated old and young) mounted in an isolated organ chamber. Abdominal aortic rings were used for protein expression analysis and determination of reactive oxygen species (ROS) and nitric oxide (NO) production. Our results showed that the Ang-(1-7) vasodilatory effect was absent in aorta from old females, contrasting with a full response in vessels from young females. The Ang-(1-7) vasodilatory effect was restored by E2 replacement in old females. A robust increase in Mas receptor, SOD2, NRF-2 and NOX2 expression was observed in aorta from old females, which was normalized by E2. This effect of E2 was also associated with lower production of ROS and normal levels of NO. In conclusion, our data demonstrated that pathways involved in the Ang-(1-7) vasodilatory response in female mice is affected by hormonal changes in ageing and rescued by E2.

Neonatal cardiomyocyte hypertrophy induced by endothelin-1 is blocked by estradiol acting on GPER.

Estradiol (E2) prevents cardiac hypertrophy, and these protective actions are mediated by estrogen receptor (ER)α and ERß. The G protein-coupled estrogen receptor (GPER) mediates many estrogenic effects, and its activation in the heart has been observed in ischemia and reperfusion injury or hypertension models; however, the underlying mechanisms need to be fully elucidated. Herein, we investigated whether the protective effect of E2 against cardiomyocyte hypertrophy induced by endothelin-1 (ET-1) is mediated by GPER and the signaling pathways involved. Isolated neonatal female rat cardiomyocytes were treated with ET-1 (100 nmol/l) for 48 h in the presence or absence of E2 (10 nmol/l) or GPER agonist G-1 (10 nmol/l) and GPER antagonist G-15 (10 nmol/l). ET-1 increased the surface area of cardiomyocytes, and this was associated with increased expression of atrial and brain natriuretic peptides. Additionally, ET-1 increased the phosphorylation of extracellular signal-related protein kinases-1/2 (ERK1/2). Notably, E2 or G-1 abolished the hypertrophic actions of ET-1, and that was reversed by G-15. Likewise, E2 reversed the ET-1-mediated increase of ERK1/2 phosphorylation as well as the decrease of phosphorylated Akt and its upstream activator 3-phosphoinositide-dependent protein kinase-1 (PDK1). These effects were inhibited by G-15, indicating that they are GPER dependent. Confirming the participation of GPER, siRNA silencing of GPER inhibited the antihypertrophic effect of E2. In conclusion, E2 plays a key role in antagonizing ET-1-induced hypertrophy in cultured neonatal cardiomyocytes through GPER signaling by a mechanism involving activation of the PDK1 pathway, which would prevent the increase of ERK1/2 activity and consequently the development of hypertrophy.

Cardiac Hypertrophy and Brain Natriuretic Peptide Levels in an Ovariectomized Rat Model Fed a High-Fat Diet.

BACKGROUND Heart failure in women increases around the time of menopause when high-fat diets may result in obesity. The heart produces brain natriuretic peptide (BNP), also known as B-type natriuretic peptide. This aims of this study were to assess cardiac hypertrophy and BNP levels in ovariectomized rats fed a high-fat diet. MATERIAL AND METHODS Forty-eight female Wistar rats were divided into four groups: sham-operated rats fed a control diet (SC) (n=12); ovariectomized rats fed a control diet (OC) (n=12); sham-operated rats fed a high-fat diet (SF) (n=12); and ovariectomized rats fed a high-fat diet (OF) (n=12). Body weight and blood pressure were measured weekly for 24 weeks. Rats were then euthanized, and plasma samples and heart tissue were studied for gene expression, hydroxyproline levels, and histological examination. RESULTS A high-fat diet and ovariectomy (group OF) increased the weight body and the systolic blood pressure after three months and five months, respectively. Cardiomyocyte hypertrophy was associated with increased expression of ventricular BNP, decreased natriuretic peptide receptor (NPR)-A and increased levels of hydroxyproline and transforming growth factor (TGF)-ß. The plasma levels of BNP and estradiol were inversely correlated; expression of estrogen receptor (ER)ß and ERα were reduced. CONCLUSIONS The findings of this study showed that, in the ovariectomized rats fed a high-fat diet, the BNP-NPR-A receptor complex was involved in cardiac remodeling. BNP may be a marker of cardiac hypertrophy in this animal model.

The effect of angiotensin-converting enzyme inhibition throughout a superovulation protocol in ewes.

Many studies identified new components of the renin­angiotensin system (RAS), such as Angiotensin-(1-7) [Ang-(1­7)] and Angiotensin-converting enzyme type 2 (ACE2), in mammalian ovaries.We previously showed Angiotensin-Converting Enzyme (ACE) inhibition, which increases the level of Ang-(1­7), stimulated ovarian estradiol output in ewe after estrous synchronization. Considering that Ang-(1­7) stimulates ovarian function and elevated estradiol before ovulation is associated with increased chance of achieving pregnancy, the present study investigated whether ACE inhibition throughout a superovulation protocol in ewe might improve ovulation outcome. At first, immunohistochemistry in ovaries of nonpregnant ewes revealed localization of Angiotensin II (Ang II), Ang-(1­7) and ACE2 in theca cells of antral follicles and in corpus luteum. Ang II and Ang-(1­7)were also detected in follicular fluid (FF) by Radioimmunoassay (RIA). Enalapril treatment throughout the superovulation protocol decreased 17ß-estradiol (E2) output and raised progesterone:estradiol (P4:E2) ratio without a direct influence on ovulation and quality of embryos.

Sepsis induced by Staphylococcus aureus: participation of biomarkers in a murine model.

BACKGROUND: This study aimed to evaluate the role of biomarkers in the pathophysiological process induced by a Staphylococcus aureus strain obtained in a hospital environment. For this, we intraperitoneally inoculated groups of male BALB/c mice with S. aureus, using a clinical isolate (CI) of S. aureus. MATERIAL/METHODS: Mice were divided into groups according to time of euthanasia (24, 48, 72, 96, 120, 144, and 168 hours of infection). After being euthanized, blood samples were collected for quantification of microorganisms and leukocytes, as well as measurement of biomarkers of tumor necrosis factor alpha (TNF-α), interleukin 6 (IL-6), C-reactive protein (CRP), and Procalcitonin (PCT) by ELISA. Heart, kidneys, and lungs were removed for histopathological analysis, assessment of biomarkers of tissue expression by RT-PCR (polymerase chain reaction with reverse transcriptase), and quantification of microorganisms by real-time quantitative PCR (real-time PCR). RESULTS: The animals infected at between 120 hours and 168 hours had the highest blood levels of S. aureus. We observed that infection promoted increases in the levels of circulating neutrophils and monocytes. However, there was a reduction of circulating neutrophils and monocytes after 96 hours of infection. The infected mice also had increased levels of blood lymphocytes. In this model of infection with S. aureus, IL-6, CRP, and PCT demonstrated greater fidelity as markers of infection, since serum levels were elevated and lowered along with the number of circulating neutrophils and monocytes after resolution of the infection. The lungs showed hyperemia, with enlargement of the alveolar septa. On the other hand, infection with S. aureus did not promote visible change in histological tissue in the heart and kidneys. CONCLUSIONS: In this model of infection with S. aureus, IL-6, CRP, and PCT demonstrated greater fidelity as markers of infection, since serum levels were elevated and lowered along with the number of circulating neutrophils and monocytes after resolution of the infection. We believe our results may provide a better understanding of the pathophysiology, as well as aid in the search for a more reliable method of diagnosis.

Natriuretic peptide system: a link between fat mass and cardiac hypertrophy and hypertension in fat-fed female rats.

The present study was designed to develop an animal model of hypertension and cardiac hypertrophy associated with obesity in female rats. Furthermore, we studied the involvement of the natriuretic peptide system in the mechanisms of these conditions. Obesity was induced in Wistar rats by a high fat diet and ovariectomy. The rats were divided into four groups: ovariectomized or sham-operated with high-fat diet and ovariectomized or sham-operated with control diet. After 24 weeks of diet, rats were killed, and their tissues were removed. Cardiac atrial natriuretic peptide (ANP), clearance receptor (NPr-C) gene expression was determined by PCR. ANP concentrations were measured in plasma. Ovariectomized fat-fed rats (OF) showed increased body weight, visceral fat depot and blood pressure and decreased sodium excretion compared to other groups. Also, these rats showed higher heart-to-body weight and cell diameters of ventricular cardiomyocytes and lower cardiac ANP mRNA and plasma ANP than the control group. The adipocyte and renal NPr-C mRNA of OF rats were higher than the control group. These data showed that combined ovariectomy and high fat diet elicited obesity, hypertension and cardiac hypertrophy. These results suggest that the impairment of the natriuretic peptide system may be one of the mechanisms involved not only in development of hypertension but also in cardiac hypertrophy associated with obesity in ovariectomized rats.