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1.
Int J Mol Sci ; 25(5)2024 Mar 06.
Artigo em Inglês | MEDLINE | ID: mdl-38474296

RESUMO

This Special Issue highlights the key molecules and molecular signaling pathways associated with diabetes and its multifaceted complications [...].


Assuntos
Diabetes Mellitus , Medicamentos de Ervas Chinesas , Humanos , Simulação de Acoplamento Molecular
2.
Arch Toxicol ; 97(10): 2643-2657, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37594589

RESUMO

Silver nanoparticles (AgNP) are among the most widely commercialized nanomaterials globally, with applications in medicine and the food industry. Consequently, the increased use of AgNP in the food industry has led to an unavoidable rise  in human exposure to these nanoparticles. Their widespread use raises concerns about potential hazards to human health, specifically their intestinal pro-inflammatory effects. Thus, the main objective of this study was to evaluate the biological effects of two subacute doses of 5 nm polyvinylpyrrolidone (PVP)-AgNP in C57BL/6J mice. One mg/kg body weight or 10 mg/kg bw was provided once a day for 14 days, using a new technology (HaPILLness) that allows voluntary, stress-free, and accurate oral dosing. It was observed that after oral ingestion, while AgNP is biodistributed throughout the entire organism, most of the ingested dose is excreted in the feces. The passage and accumulation of AgNP throughout the intestine instigated a prominent inflammatory response, marked by significant histological, vascular, and cellular transformations. This response was driven by the activation of the nuclear factor-кB (NF-кB) inflammatory pathway, ultimately leading to the generation of multiple cytokines and chemokines.


Assuntos
Nanopartículas Metálicas , Camundongos , Humanos , Animais , Camundongos Endogâmicos C57BL , Nanopartículas Metálicas/toxicidade , Prata/toxicidade , Distribuição Tecidual , Intestinos
3.
Int J Mol Sci ; 24(17)2023 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-37686434

RESUMO

The mechanistic/mammalian target of rapamycin (mTOR), a member of the phosphoinositide 3-kinase (PI3K) related kinase family, integrates intracellular and environmental cues that coordinate a diverse set of cellular/tissue functions, such as cell growth, proliferation, metabolism, autophagy, apoptosis, longevity, protein/lipid/nucleotide synthesis, and tissue regeneration and repair [...].


Assuntos
Doenças Cardiovasculares , Diabetes Mellitus , Neoplasias , Humanos , Doenças Cardiovasculares/etiologia , Fosfatidilinositol 3-Quinases , Serina-Treonina Quinases TOR
4.
Pharmacol Res ; 180: 106151, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35247601

RESUMO

For the first time, the present study unravels a cardiospecific therapeutic approach for Pulmonary Arterial Hypertension (PAH), a disease with a very poor prognosis and high mortality rates due to right ventricle (RV) dysfunction. We first established a new in vitro model of high-pressure-induced hypertrophy that closely resembles heart defects associated with PAH and validated our in vitro findings on a preclinical in vivo model of monocrotaline (MCT)-induced PAH. Our results showed the in vitro antihypertrophic effect of 1,8-cineole, a monoterpene widely found in several essential oils. Also, a decrease in RV hypertrophy and fibrosis, and an improvement in heart function in vivo was observed, when 1,8-cineole was applied topically. Furthermore, 1,8-cineole restored gap junction protein connexin43 distribution at the intercalated disks and mitochondrial functionality, suggesting it may act by preserving cardiac cell-to-cell communication and bioenergetics. Overall, our results point out a promising therapeutic compound that can be easily applied topically, thus paving the way for the development of effective cardiac-specific therapies to greatly improve PAH outcomes.


Assuntos
Cardiomiopatias , Hipertensão Pulmonar , Hipertensão Arterial Pulmonar , Disfunção Ventricular Direita , Animais , Conexina 43 , Modelos Animais de Doenças , Eucaliptol/uso terapêutico , Ventrículos do Coração/metabolismo , Homeostase , Humanos , Hipertensão Pulmonar/tratamento farmacológico , Hipertrofia Ventricular Direita/metabolismo , Hipertensão Arterial Pulmonar/tratamento farmacológico , Disfunção Ventricular Direita/metabolismo
5.
Inflamm Res ; 71(5-6): 591-602, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35471601

RESUMO

BACKGROUND: Inflammation is a common feature in the pathogenesis of chronic kidney disease (CKD), regardless of the disease cause. Our aim was to evaluate the potential of several inflammatory biomarkers in CKD diagnosis and staging. METHODS: A total of 24 healthy controls and 92 pre-dialysis CKD patients with diverse etiologies, were enrolled in this study and grouped according to their CKD stage. We analysed the circulating levels of inflammatory molecules, C-reactive protein (CRP), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), tumor necrosis factor receptor 2 (TNFR2), pentraxin 3 (PTX3) and leptin, as well as the hemogram. We studied their association with parameters of kidney function and kidney injury, to evaluate their potential as early markers of the disease and/or of its worsening, as well as their interplay. RESULTS: Compared to controls, patients in CKD stages 1-2 presented significantly higher IL-6 and TNFR2 levels, and higher neutrophil-to-lymphocyte ratio. All inflammatory cytokines and acute-phase proteins showed a trend to increase up to stage 3, stabilizing or declining thereafter, save for TNFR2, which steadily increased from stage to stage. All inflammatory molecules, apart from PTX3, were negatively and significantly correlated with eGFR, with a remarkable value for TNFR2 (r = - 0.732, p < 0.001). CONCLUSION: TNFR2 might be useful for an early detection of CKD, as well as for disease staging/worsening. Still, the potential value of this biomarker in disease progression warrants further investigation.


Assuntos
Receptores Tipo II do Fator de Necrose Tumoral , Insuficiência Renal Crônica , Biomarcadores/metabolismo , Humanos , Inflamação/metabolismo , Interleucina-6/metabolismo , Rim/metabolismo , Receptores Tipo II do Fator de Necrose Tumoral/metabolismo , Insuficiência Renal Crônica/metabolismo
6.
Int J Mol Sci ; 23(6)2022 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-35328704

RESUMO

Chronic kidney disease (CKD) has been recognized as a global public health problem. Despite the current advances in medicine, CKD-associated morbidity and mortality remain unacceptably high. Several studies have highlighted the contribution of inflammation and inflammatory mediators to the development and/or progression of CKD, such as tumor necrosis factor (TNF)-related biomarkers. The inflammation pathway driven by TNF-α, through TNF receptors 1 (TNFR1) and 2 (TNFR2), involves important mediators in the pathogenesis of CKD. Circulating levels of TNFRs were associated with changes in other biomarkers of kidney function and injury, and were described as predictors of disease progression, cardiovascular morbidity, and mortality in several cohorts of patients. Experimental studies describe the possible downstream signaling pathways induced upon TNFR activation and the resulting biological responses. This review will focus on the available data on TNFR1 and TNFR2, and illustrates their contributions to the pathophysiology of kidney diseases, their cellular and molecular roles, as well as their potential as CKD biomarkers. The emerging evidence shows that TNF receptors could act as biomarkers of renal damage and as mediators of the disease. Furthermore, it has been suggested that these biomarkers could significantly improve the discrimination of clinical CKD prognostic models.


Assuntos
Receptores Tipo II do Fator de Necrose Tumoral , Insuficiência Renal Crônica , Animais , Biomarcadores , Humanos , Inflamação , Modelos Animais , Receptores Tipo I de Fatores de Necrose Tumoral/metabolismo , Receptores Tipo II do Fator de Necrose Tumoral/metabolismo , Transdução de Sinais , Fator de Necrose Tumoral alfa
7.
Eur J Clin Invest ; 51(5): e13482, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33350459

RESUMO

The concept of developmental origins of health and disease (DOHaD) was initially supported by the low birth weight and higher risk of developing cardiovascular disease in adult life, caused by nutrition restriction during foetal development. However, other programming windows have been recognized in the last years, namely lactation, infancy, adolescence and even preconception. Although the concept has been developed in order to study the impact of foetal calorie restriction in adult life, it is now recognized that maternal overweight during programming windows is also harmful to the offspring. This article explores and summarizes the current knowledge about the impact of maternal obesity and obesogenic diets during lactation in the metabolic programming towards the development of metabolic syndrome in the adult life. The impact of maternal obesity and obesogenic diets in milk quality is discussed, including the alterations in specific micro and macronutrients, as well as the impact of such alterations in the development of metabolic syndrome-associated features in the newborn, such as insulin resistance and adiposity. Moreover, the impact of milk quality and formula feeding in infants' gut microbiota, immune system maturation and in the nutrient-sensing mechanisms, namely those related to gut hormones and leptin, are also discussed under the current knowledge.


Assuntos
Aleitamento Materno , Dieta , Microbioma Gastrointestinal , Síndrome Metabólica , Leite Humano , Obesidade Materna , Adiposidade , Alimentação com Mamadeira , Feminino , Humanos , Fórmulas Infantis , Resistência à Insulina , Lactação , Gravidez
8.
Artif Organs ; 45(7): 748-753, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33350476

RESUMO

Tracheal stenosis in children is a challenge for the healthcare team, since it is a rare disease. Patients usually have other clinical comorbidities, mainly previous cardiac surgical interventions. This retrospective single-center study included infants with tracheal stenosis (congenital or acquired) operated between 2016 and 2020 on venoarterial extracorporeal membrane oxygenation (VA ECMO). Five patients were operated and the median age of detection of the tracheal disease was 3.7 months, and the median age at the operation was 5 months. All patients had associated cardiac anomalies. Four patients had congenital tracheal stenosis; two with associated pig bronchus. One patient had acquired subglottic stenosis with concomitant stenosis at the carina. After the operation, the patients were referred to ICU on ECMO with an open chest. Minor ECMO-related complications occurred in two patients (hemothorax and wound infection). All patients required endoscopic evaluation during the postoperative care; median of 3.2 procedures. Two patients are currently in follow-up and three have died. Slide tracheoplasty with VA-ECMO can be successfully performed in infants with prior cardiac surgery. Nevertheless, a difficult postoperative course should be anticipated, with possible prolonged ECMO use, readmissions, and higher morbidity and mortality than in children with tracheal stenosis alone.


Assuntos
Oxigenação por Membrana Extracorpórea , Estenose Traqueal/cirurgia , Oxigenação por Membrana Extracorpórea/efeitos adversos , Feminino , Cardiopatias Congênitas/complicações , Hemotórax/etiologia , Humanos , Lactente , Recém-Nascido , Masculino , Estudos Retrospectivos , Estenose Traqueal/complicações , Estenose Traqueal/mortalidade , Infecção dos Ferimentos/etiologia
9.
BMC Public Health ; 21(1): 1628, 2021 09 06.
Artigo em Inglês | MEDLINE | ID: mdl-34488709

RESUMO

BACKGROUND: Non-communicable diseases are a leading cause of health loss worldwide, in part due to unhealthy lifestyles. Metabolic-based diseases are rising with an unhealthy body-mass index (BMI) in rural areas as the main risk factor in adults, which may be amplified by wider determinants of health. Changes in rural environments reflect the need of better understanding the factors affecting the self-ability for making balanced decisions. We assessed whether unhealthy lifestyles and environment in rural neighbourhoods are reflected into metabolic risks and health capability. METHODS: We conducted a community-based cross-sectional study in 15 Portuguese rural neighbourhoods to describe individuals' health functioning condition and to characterize the community environment. We followed a qualitatively driven mixed-method design to gather information about evidence-based data, lifestyles and neighbourhood satisfaction (incorporated in eVida technology), within a random sample of 270 individuals, and in-depth interviews to 107 individuals, to uncover whether environment influence the ability for improving or pursuing heath and well-being. RESULTS: Men showed to have a 75% higher probability of being overweight than women (p-value = 0.0954); and the reporting of health loss risks was higher in women (RR: 1.48; p-value = 0.122), individuals with larger waist circumference (RR: 2.21; IC: 1.19; 4.27), overweight and obesity (RR: 1.38; p-value = 0.293) and aged over 75 years (RR: 1.78; p-value = 0.235; when compared with participants under 40 years old). Metabolic risks were more associated to BMI and physical activity than diet (or sleeping habits). Overall, metabolic risk linked to BMI was higher in small villages than in municipalities. Seven dimensions, economic development, built (and natural) environment, social network, health care, demography, active lifestyles, and mobility, reflected the self-perceptions in place affecting the individual ability to make healthy choices. Qualitative data exposed asymmetries in surrounding environments among neighbourhoods and uncovered the natural environment and natural resources specifies as the main value of rural well-being. CONCLUSIONS: Metabolic risk factors reflect unhealthy lifestyles and can be associated with environment contextual-dependent circumstances. People-centred approaches highlight wider socioeconomic and (natural) environmental determinants reflecting health needs, health expectations and health capability. Our community-based program and cross-disciplinary research provides insights that may improve health-promoting changes in rural neighbourhoods.


Assuntos
Estilo de Vida , População Rural , Adulto , Idoso , Índice de Massa Corporal , Estudos Transversais , Feminino , Humanos , Masculino , Circunferência da Cintura
10.
Int J Mol Sci ; 22(1)2020 Dec 22.
Artigo em Inglês | MEDLINE | ID: mdl-33375198

RESUMO

The prevalence of chronic kidney disease (CKD) is increasing worldwide, and the mortality rate continues to be unacceptably high. The biomarkers currently used in clinical practice are considered relevant when there is already significant renal impairment compromising the early use of potentially successful therapeutic interventions. More sensitive and specific biomarkers to detect CKD earlier on and improve patients' prognoses are an important unmet medical need. The aim of this review is to summarize the recent literature on new promising early CKD biomarkers of renal function, tubular lesions, endothelial dysfunction and inflammation, and on the auspicious findings from metabolomic studies in this field. Most of the studied biomarkers require further validation in large studies and in a broad range of populations in order to be implemented into routine CKD management. A panel of biomarkers, including earlier biomarkers of renal damage, seems to be a reasonable approach to be applied in clinical practice to allow earlier diagnosis and better disease characterization based on the underlying etiologic process.


Assuntos
Biomarcadores/análise , Diagnóstico Precoce , Insuficiência Renal Crônica/diagnóstico , Insuficiência Renal Crônica/terapia , Progressão da Doença , Glucuronidase/análise , Humanos , Oxirredutases Intramoleculares/análise , Proteínas Klotho , Lipocalinas/análise , Prognóstico , Sensibilidade e Especificidade , Microglobulina beta-2/análise
11.
Mol Vis ; 24: 353-366, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29853770

RESUMO

Purpose: Diabetic retinopathy is a neurovascular disease characterized by increased permeability of the blood-retinal barrier, changes in the neural components of the retina, and low-grade chronic inflammation. Diabetic retinopathy is a major complication of diabetes; however, the impact of a prediabetic state on the retina remains to be elucidated. The aim of this study was to assess possible early retinal changes in prediabetic rats, by evaluating changes in the integrity of the blood-retinal barrier, the retinal structure, neural markers, and inflammatory mediators. Methods: Several parameters were analyzed in the retinas of Wistar rats that drank high sucrose (HSu; 35% sucrose solution during 9 weeks, the prediabetic animal model) and were compared with those of age-matched controls. The permeability of the blood-retinal barrier was assessed with the Evans blue assay, and the content of the tight junction proteins and neural markers with western blotting. Optical coherence tomography was used to evaluate retinal thickness. Cell loss at the ganglion cell layer was assessed with terminal deoxynucleotidyl transferase (TdT) dUTP nick-end labeling (TUNEL) assay and by evaluating the immunoreactivity of the Brn3a transcription factor. To assess retinal neuroinflammation, the mRNA expression and protein levels of inducible nitric oxide synthase isoform (iNOS), interleukin-1 beta (IL-1ß), and tumor necrosis factor (TNF) were evaluated. Iba1 and MHC-II immunoreactivity and translocator protein (TSPO) mRNA levels were assessed to study the microglial number and activation state. Results: The thickness of the inner retinal layers of the HSu-treated animals decreased. Nevertheless, no apoptotic cells were observed, and no changes in retinal neural markers were detected in the retinas of the HSu-treated animals. No changes were detected in the permeability of the blood-retinal barrier, as well as the tight junction protein content between the HSu-treated rats and the controls. In addition, the inflammatory parameters remained unchanged in the retina despite the tendency for an increase in the number of retinal microglial cells. Conclusions: In a prediabetic rat model, the retinal structure is affected by the thinning of the inner layers, without overt vascular and inflammatory alterations. The results suggest neuronal dysfunction (thinning of the inner retina) that may precede or anticipate the vascular and inflammatory changes. Subtle structural changes might be viewed as early disturbances in an evolving disease, suggesting that preventive strategies (such as the modification of diet habits) could be applied at this stage, before the progression toward irreversible dysfunction and damage to the retina.


Assuntos
Células Ependimogliais/efeitos dos fármacos , Estado Pré-Diabético/diagnóstico , Transdução de Sinais/efeitos dos fármacos , Sacarose/farmacologia , Animais , Barreira Hematorretiniana/efeitos dos fármacos , Permeabilidade Capilar/efeitos dos fármacos , Proteínas de Transporte/genética , Proteínas de Transporte/metabolismo , Retinopatia Diabética/induzido quimicamente , Retinopatia Diabética/diagnóstico , Retinopatia Diabética/genética , Retinopatia Diabética/metabolismo , Modelos Animais de Doenças , Células Ependimogliais/citologia , Células Ependimogliais/metabolismo , Azul Evans/química , Regulação da Expressão Gênica , Interleucina-1beta/genética , Interleucina-1beta/metabolismo , Masculino , Óxido Nítrico Sintase Tipo II/genética , Óxido Nítrico Sintase Tipo II/metabolismo , Estado Pré-Diabético/induzido quimicamente , Estado Pré-Diabético/genética , Estado Pré-Diabético/metabolismo , Ratos , Ratos Wistar , Receptores de GABA-A/genética , Receptores de GABA-A/metabolismo , Junções Íntimas/efeitos dos fármacos , Junções Íntimas/ultraestrutura , Tomografia de Coerência Óptica , Fator de Transcrição Brn-3A/genética , Fator de Transcrição Brn-3A/metabolismo , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/metabolismo
12.
Pediatr Res ; 83(5): 1011-1015, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29638229

RESUMO

BackgroundWe intended to evaluate the effects of physical activity (PA) programs on renal function in obese boys.MethodsThirty-nine boys participated in one of the following three groups: soccer (SG, n=13), traditional PA (AG, n=13), and sedentary control (CG, n=13). SG and AG were involved in 6-month PA programs, involving three sessions/week for 60-90 min. Anthropometric measurements, body composition, creatinine and cystatin C plasmatic levels, and estimated glomerular filtration rate (eGFR) were evaluated.ResultsAt baseline (n=39), age and lean mass index (LMI) were positively correlated with creatinine levels. After 6 months, both intervention groups decreased the BMI z-score and waist circumference, while the CG increased the body fat percentage (BFP). LMI increased in all the groups. SG presented a small increment in plasma creatinine and a decrease in the eGFR values, using the Schwartz formula. Concerning the cystatin C levels and eGFR values using Filler (cystatin C-based) or Combined Zappitelli (creatinine/cystatin C-based) formulas, no significant changes were observed in any group.ConclusionThe combined Zappitelli formula showed no significant impact of PA on eGFR in obese boys. Although plasma creatinine is significantly influenced by lean body mass, cystatin C is likely to be a more accurate marker of renal function in this population.


Assuntos
Terapia por Exercício , Rim/fisiologia , Obesidade Infantil/terapia , Tecido Adiposo , Algoritmos , Antropometria , Biomarcadores/sangue , Composição Corporal , Índice de Massa Corporal , Criança , Creatinina/sangue , Cistatina C/sangue , Exercício Físico , Taxa de Filtração Glomerular , Humanos , Testes de Função Renal , Masculino , Comportamento Sedentário , Futebol , Circunferência da Cintura
14.
Biochim Biophys Acta ; 1861(12 Pt A): 1929-1941, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27686967

RESUMO

New onset diabetes after transplantation (NODAT) is a metabolic disorder that affects 40% of patients on immunosuppressive agent (IA) treatment, such as rapamycin (also known as sirolimus). IAs negatively modulate insulin action in peripheral tissues including skeletal muscle, liver and white fat. However, the effects of IAs on insulin sensitivity and thermogenesis in brown adipose tissue (BAT) have not been investigated. We have analyzed the impact of rapamycin on insulin signaling, thermogenic gene-expression and mitochondrial respiration in BAT. Treatment of brown adipocytes with rapamycin for 16h significantly decreased insulin receptor substrate 1 (IRS1) protein expression and insulin-mediated protein kinase B (Akt) phosphorylation. Consequently, both insulin-induced glucose transporter 4 (GLUT4) translocation to the plasma membrane and glucose uptake were decreased. Early activation of the N-terminal Janus activated kinase (JNK) was also observed, thereby increasing IRS1 Ser 307 phosphorylation. These effects of rapamycin on insulin signaling in brown adipocytes were partly prevented by a JNK inhibitor. In vivo treatment of rats with rapamycin for three weeks abolished insulin-mediated Akt phosphorylation in BAT. Rapamycin also inhibited norepinephrine (NE)-induced lipolysis, the expression of peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) and uncoupling protein (UCP)-1 in brown adipocytes. Importantly, basal mitochondrial respiration, proton leak and maximal respiratory capacity were significantly decreased in brown adipocytes treated with rapamycin. In conclusion, we demonstrate, for the first time the important role of brown adipocytes as target cells of rapamycin, suggesting that insulin resistance in BAT might play a major role in NODAT development.


Assuntos
Adipócitos Marrons/efeitos dos fármacos , Glucose/metabolismo , Insulina/metabolismo , Transdução de Sinais/efeitos dos fármacos , Sirolimo/farmacologia , Proteína Desacopladora 1/metabolismo , Adipócitos Marrons/metabolismo , Tecido Adiposo Marrom/efeitos dos fármacos , Tecido Adiposo Marrom/metabolismo , Animais , Respiração Celular/efeitos dos fármacos , Expressão Gênica/efeitos dos fármacos , Transportador de Glucose Tipo 4/metabolismo , Proteínas Substratos do Receptor de Insulina/metabolismo , Resistência à Insulina/fisiologia , Masculino , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/metabolismo , Coativador 1-alfa do Receptor gama Ativado por Proliferador de Peroxissomo/metabolismo , Fosforilação/efeitos dos fármacos , Ratos , Ratos Sprague-Dawley , Ratos Wistar , Termogênese/efeitos dos fármacos
15.
Crit Rev Food Sci Nutr ; 57(9): 1799-1806, 2017 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-26114303

RESUMO

Rosmarinic acid (RA) is a natural polyphenolic antioxidant derived from many common herbal plants. This compound displays several important biological properties, including anti-inflammatory, antiviral, antibacterial, antidepressant, anticarcionogenic, and chemopreventive properties. The importance of its activities and its possible application in processed foods as a natural antioxidant has reached a new interest levels in recent years. The health effects of this polyphenol depend greatly on both its intakes and bioavailability. This review focuses on the importance of RA as a dietary supplement, and summarizes its pharmacokinetics and metabolism, including the factors that limit its oral bioavailability which leads to a lower therapeutic action. Further experimental investigations are needed to optimize and enhance the oral bioavailability of this natural compound which consequently will help increasing therapeutic efficacy of RA in vivo.


Assuntos
Cinamatos/farmacologia , Cinamatos/farmacocinética , Citoproteção/efeitos dos fármacos , Depsídeos/farmacologia , Depsídeos/farmacocinética , Suplementos Nutricionais , Animais , Antioxidantes/química , Antioxidantes/farmacocinética , Antioxidantes/farmacologia , Disponibilidade Biológica , Boraginaceae/química , Cinamatos/química , Depsídeos/química , Ácido Rosmarínico
16.
Crit Rev Food Sci Nutr ; 57(9): 1863-1873, 2017 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-26192708

RESUMO

Drug delivery systems, accompanied by nanoparticle technology, have recently emerged as prominent solutions to improve the pharmacokinetic properties, namely bioavailability, of therapeutic and nutraceutical agents. Solid lipid nanoparticles (SLNs) have received much attention from researchers due to their potential to protect or improve drug properties. SLNs have been reported to be an alternative system to traditional carriers, such as emulsions, liposomes, and polymeric nanoparticles. Phenolic compounds are widespread in plant-derived foodstuffs and therefore abundant in our diet. Over the last decades, phenolic compounds have received considerable attention due to several health promoting properties, mostly related to their antioxidant activity, which can have important implications for health. However, most of these compounds have been associated with poor bioavailability being poorly absorbed, rapidly metabolized and eliminated, which compromises its biological and pharmacological benefits. This paper provides a systematic review of the use of SLNs as oral delivery systems of phenolic compounds, in order to overcome pharmacokinetic limitations of these compounds and improved nutraceutical potential. In vitro studies, as well as works describing topical and oral treatments will be revisited and discussed. The classification, synthesis, and clinical application of these nanomaterials will be also considered in this review article.


Assuntos
Lipídeos/química , Nanopartículas/química , Fenóis/administração & dosagem , Fenóis/farmacocinética , Administração Oral , Suplementos Nutricionais , Sistemas de Liberação de Medicamentos
17.
BMC Med ; 14(1): 163, 2016 10 21.
Artigo em Inglês | MEDLINE | ID: mdl-27769244

RESUMO

BACKGROUND: High-grade non-muscle invasive bladder cancer (NMIBC) has a high risk of recurrence and progression to muscle-invasive forms, which seems to be largely related to the presence of tumorigenic stem-like cell populations that are refractory to conventional therapies. Here, we evaluated the therapeutic potential of Natural Killer (NK) cell-based adoptive immunotherapy against chemoresistant bladder cancer stem-like cells (CSCs) in a pre-clinical relevant model, using NK cells from healthy donors and NMIBC patients. METHODS: Cytokine-activated NK cells from healthy donors and from high-grade NMIBC patients were phenotypically characterized and assayed in vitro against stem-like and bulk differentiated bladder cancer cells. Stem-like cells were isolated from two bladder cancer cell lines using the sphere-forming assay. The in vivo therapeutic efficacy was evaluated in mice bearing a CSC-induced orthotopic bladder cancer. Animals were treated by intravesical instillation of interleukin-activated NK cells. Tumor response was evaluated longitudinally by non-invasive bioluminescence imaging. RESULTS: NK cells from healthy donors upon activation with IL-2 and IL-15 kills indiscriminately both stem-like and differentiated tumor cells via stress ligand recognition. In addition to cell killing, NK cells shifted CSCs towards a more differentiated phenotype, rendering them more susceptible to cisplatin, highlighting the benefits of a possible combined therapy. On the contrary, NK cells from NMIBC patients displayed a low density on NK cytotoxicity receptors, adhesion molecules and a more immature phenotype, losing their ability to kill and drive differentiation of CSCs. The local administration, via the transurethral route, of activated NK cells from healthy donors provides an efficient tumor infiltration and a subsequent robust tumoricidal activity against bladder cancer with high selective cytolytic activity against CSCs, leading to a dramatic reduction in tumor burden from 80 % to complete remission. CONCLUSION: Although pre-clinical, our results strongly suggest that an immunotherapeutic strategy using allogeneic activated NK cells from healthy donors is effective and should be exploited as a complementary therapeutic strategy in high-risk NMIBC patients to prevent tumor recurrence and progression.


Assuntos
Imunoterapia Adotiva/métodos , Células Matadoras Naturais/imunologia , Células Matadoras Naturais/transplante , Células-Tronco Neoplásicas/imunologia , Neoplasias da Bexiga Urinária/terapia , Idoso , Animais , Diferenciação Celular/imunologia , Linhagem Celular Tumoral , Cisplatino/farmacologia , Feminino , Humanos , Imunofenotipagem , Interleucina-15/farmacologia , Interleucina-2/farmacologia , Células K562 , Células Matadoras Naturais/efeitos dos fármacos , Masculino , Camundongos , Camundongos Nus , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/patologia , Células-Tronco Neoplásicas/patologia , Neoplasias da Bexiga Urinária/imunologia , Neoplasias da Bexiga Urinária/patologia
18.
Blood Cells Mol Dis ; 59: 63-70, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-27282570

RESUMO

The crosstalk between several factors controlling hepcidin synthesis is poorly clarified for different physiological and pathological conditions. Our aim was to study the impact of increasing recombinant human erythropoietin (rHuEPO) doses on erythropoiesis, iron metabolism and hepcidin, using a rat model. Male Wistar rats were divided in 5 groups: control (vehicle) and rHuEPO-treated groups (100, 200, 400 and 600IU/kgbody weight/week), 3 times per week, during 3weeks. Hematological and iron data were evaluated. The expression of several genes involved in iron metabolism was analyzed by qPCR. Liver hepcidin protein was evaluated by Western Blot. The rHuEPO treatment induced erythropoiesis and increased transferrin saturation (TSAT) in a dose dependent manner. Tf receptor 2 (TfR2), hemojuvelin (HJV) and bone morphogenetic protein 6 (BMP6) were up-regulated in rHuEPO200 group. Matriptase-2 was down-regulated in rHuEPO200 group, and up-regulated in the other rHuEPO-treated groups. Hepcidin synthesis was increased in rHuEPO200 group, and repressed in the rHuEPO400 and rHuEPO600 groups. Our study showed that when a high erythropoietic stimulus occurs, hepcidin synthesis is mainly regulated by TSAT; however, when the erythropoiesis rate reaches a specific threshold, extramedullary hematopoiesis is triggered, and the control of hepcidin synthesis is switched to matriptase-2, thus inhibiting hepcidin synthesis.


Assuntos
Eritropoese/fisiologia , Eritropoetina/farmacologia , Hepcidinas/metabolismo , Ferro/metabolismo , Animais , Relação Dose-Resposta a Droga , Eritropoese/efeitos dos fármacos , Eritropoetina/uso terapêutico , Regulação da Expressão Gênica , Hepcidinas/análise , Hepcidinas/biossíntese , Hepcidinas/genética , Humanos , Masculino , Proteínas de Membrana/fisiologia , Ratos , Ratos Wistar , Proteínas Recombinantes/uso terapêutico , Serina Endopeptidases/fisiologia , Transferrina/fisiologia
19.
Int J Legal Med ; 130(4): 959-965, 2016 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-26846768

RESUMO

Gamma-hydroxybutyric acid (GHB) is an endogenous compound which has a story of clinical use and illicit abuse since the 1960's. The possibility to use a multi-sample approach for GHB evaluation, including whole blood and hair, to better characterize a forensic toxicology case and evaluate a possible causal association with the death is an exciting up-to-date issue. In addition, its post-mortem behaviour, namely regarding degradation and metabolism, has been increasingly investigated as a putative biomarker for post-mortem interval (PMI) estimation. Thus, in order to contribute to clarification of this specific aspect, whole blood and hair post-mortem GHB levels were evaluated in 32 real cases with previous information on death and autopsy data. The results obtained suggest that the PMI (until 5 days between death and sampling) influences GHB whole blood concentration, but not GHB levels in hair samples. No differences were encountered for the other parameters evaluated, including age, gender, cause of death and presence or absence of substances. This study brings new insights regarding the usefulness of GHB levels in forensic toxicology, which might be further strengthened with larger, but comparable, studies from other laboratories and institutions in the context of legal medicine.


Assuntos
Cabelo/química , Hidroxibutiratos/análise , Mudanças Depois da Morte , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/análise , Feminino , Cromatografia Gasosa-Espectrometria de Massas , Humanos , Limite de Detecção , Masculino , Pessoa de Meia-Idade , Adulto Jovem
20.
Clin Exp Pharmacol Physiol ; 43(3): 343-54, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26889660

RESUMO

Clinical studies showed that high doses of recombinant human erythropoietin (rHuEPO) used to correct anaemia in chronic kidney disease (CKD) hyporesponsive patients may lead to deleterious effects. The aim of this study was to analyze the effects of rHuEPO in doses usually used to correct CKD-anaemia (100, 200 IU/kg body weight (BW) per week) and in higher doses used in the treatment of hyporesponsive patients (400, 600 IU/kg BW per week), focusing on renal damage, hypoxia, inflammation and fibrosis. Male Wistar rats with chronic renal failure (CRF) induced by 5/6 nephrectomy were treated with rHuEPO or with vehicle, over a 3-week period. Haematological, biochemical and renal function analyses were performed. Kidney and liver mRNA levels were evaluated by quantitative real-time polymerase chain reaction (qPCR) and protein expression by Western blot and immunohistochemistry. Kidney histopathological evaluations were also performed. The CRF group developed anaemia, hypertension and a high score of renal histopathologic lesions. Correction of anaemia was achieved with all rHuEPO doses, with improvement in hypertension, renal function and renal lesions. In addition, the higher rHuEPO doses also improved inflammation. Blood pressure was reduced in all rHuEPO-treated groups, compared to the CRF group, but increased in a dose-dependent manner. The current study showed that rHuEPO treatment corrected anaemia and improved urinary albumin excretion, particularly at lower doses. In addition, it is suggested that a short-term treatment with high doses, used to overcome an episode of hyporesponsiveness to rHuEPO therapy, can present benefits by reducing inflammation, without worsening of renal lesions; however, the pro-hypertensive effect should be considered, and carefully managed to avoid a negative cardiorenal impact.


Assuntos
Anemia/complicações , Eritropoetina/efeitos adversos , Eritropoetina/farmacologia , Hipertensão/complicações , Falência Renal Crônica/complicações , Falência Renal Crônica/tratamento farmacológico , Rim/efeitos dos fármacos , Animais , Pressão Sanguínea/efeitos dos fármacos , Peso Corporal/efeitos dos fármacos , Hipóxia Celular/efeitos dos fármacos , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Eritropoetina/uso terapêutico , Fibrose , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , Inflamação/complicações , Rim/metabolismo , Rim/patologia , Falência Renal Crônica/sangue , Falência Renal Crônica/patologia , Masculino , Tamanho do Órgão/efeitos dos fármacos , Ratos , Proteínas Recombinantes/efeitos adversos , Proteínas Recombinantes/farmacologia , Proteínas Recombinantes/uso terapêutico , Risco , Medição de Risco
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