Effect of Brassica rapa var. rapifera on Insulin Resistance and Inflammatory Analysis of Visceral Adipose Tissue of Obese Wistar Rats Under Glucolipotoxicity Condition / Efecto de Brassica rapa var. rapifera sobre la Resistencia a la Insulina y el Análisis Inflamatorio del Tejido Adiposo Visceral de Ratas Wistar Obesas en Condiciones de Glucolipotoxicidad

SUMMARY: Obesity-related pathophysiologies such as insulin resistance and the metabolic syndrome show a markedly increased risk for type 2 diabetes and atherosclerotic cardiovascular disease. This risk appears to be linked to alterations in adipose tissue function, leading to chronic inflammation and the dysregulation of adipocyte-derived factors. Brassica rapa have been used in traditional medicine for the treatment of several diseases, including diabetes. This study aimed to investigate the effect of nutritional stress induced by a high-fat and high-sucrose diet on the pathophysiology of visceral adipose tissue and the therapeutic effect of Brassica rapa in male Wistar rats. We subjected experimental rats to a high-fat (10 %) high-sucrose (20 %)/per day for 11 months and treated them for 20 days with aqueous extract Br (AEBr) at 200 mg/kg at the end of the experiment. At the time of sacrifice, we monitored plasma and tissue biochemical parameters as well as the morpho-histopathology of visceral adipose tissue. We found AEBr corrected metabolic parameters and inflammatory markers in homogenized visceral adipose tissue and reduced hypertrophy, hyperplasia, and lipid droplets. These results suggest that AEBr enhances anti-diabetic, anti-inflammatory and a protective effect on adipose tissue morphology in type 2 diabetes and obesity.

La fisiopatología relacionadas con la obesidad, como la resistencia a la insulina y el síndrome metabólico, muestran un riesgo notablemente mayor de diabetes tipo 2 y enfermedad cardiovascular aterosclerótica. Este riesgo parece estar relacionado con alteraciones en la función del tejido adiposo, lo que lleva a una inflamación crónica y a la desregulación de los factores derivados de los adipocitos. Brassica rapa se ha utilizado en la medicina tradicional para el tratamiento de varias enfermedades, incluida la diabetes. Este estudio tuvo como objetivo investigar el efecto del estrés nutricional inducido por una dieta rica en grasas y sacarosa sobre la fisiopatología del tejido adiposo visceral y el efecto terapéutico de Brassica rapa en ratas Wistar macho. Sometimos a ratas experimentales a una dieta rica en grasas (10 %) y alta en sacarosa (20 %)/por día durante 11 meses y las tratamos durante 20 días con extracto acuoso de Br (AEBr) a 200 mg/kg al final del experimento. En el momento del sacrificio, monitoreamos los parámetros bioquímicos plasmáticos y tisulares, así como la morfohistopatología del tejido adiposo visceral. Encontramos parámetros metabólicos corregidos por AEBr y marcadores inflamatorios en tejido adiposo visceral homogeneizado y reducción de hipertrofia, hiperplasia y gotitas de lípidos. Estos resultados sugieren que AEBr mejora el efecto antidiabético, antiinflamatorio y protector sobre la morfología del tejido adiposo en la diabetes tipo 2 y la obesidad.

Beneficios de los ácidos grasos poliinsaturados de cadena larga n-3 en la enfermedad por hígado graso no alcohólico / Benefits of n-3 long-chain polyunsaturated fatty acids in non-alcoholic fatty liver disease

La enfermedad por hígado graso no alcohólico (EHGNA) se asocia comúnmente con las características clínicas del síndrome metabólico como la obesidad, resistencia a la insulina y dislipidemia. La importancia clínica se debe a su elevada prevalencia (30% de la población general) y su amplio espectro de daño histológico que va desde la esteatosis simple generalmente no progresiva, a la esteatohepatitis no alcohólica, que puede conducir a cirrosis, carcinoma hepatocelular, e insuficiencia hepática. En la actualidad, se han caracterizado diferentes factores que conllevan a esta enfermedad hepática, destacándose principalmente el alto contenido de ácidos grasos libres y la resistencia a insulina. El exceso de ácidos grasos libres puede desencadenar lipotoxicidad hepática originada por un alto consumo de ácidos grasos saturados, ácidos grasos trans y carbohidratos, así como por un aumento de los radicales libres y del estrés del retículo endoplásmico. En lo que concierne a los ácidos grasos poliinsaturados de cadena larga n-3 (AGPICL n-3), se han atribuido múltiples beneficios para la salud humana. Los AGPICL n-3 EPA y DHA tienen efectos protectores en la salud cardiovascular y en la funcionalidad e integridad del sistema nervioso central. Actualmente el uso nutricional de ambos ácidos grasos es cada vez más amplio, atribuyendo sus efectos positivos no solamente al tratamiento de las enfermedades cardiovasculares y neurodegenerativas, sino también considerándolos una alternativa eficaz en el manejo de nutricional de la EHGNA. El presente trabajo analiza el uso potencial de los AGPICL n-3 en la prevención y manejo nutricional de la EHGNA.

Nonalcoholic fatty liver disease (NAFLD) is commonly associated with the clinical features of the metabolic syndrome including obesity, insulin resistance and dyslipidemia. NAFLD. Is of clinical relevance because its high prevalence (30% of the general population) and broad spectrum of histological damage, ranging from simple steatosis that is generally non progressive, to nonalcoholic steatohepatitis which can lead to cirrhosis, hepatoce-llular carcinoma, and liver failure. At present, different factors have been identified that lead to this liver disease, highlighting the high content of free fatty acids and insulin resistance. In this regard, excess of free fatty acids caused by a high intake of sa-turated fatty acids, trans fatty acids and of carbohydrates as well the increased formation free radicals that stress the endoplasmic reticulum, can trigger liver lipotoxicity. Regarding fatty acids, n-3 long-chain polyunsaturated fatty acids (n-3 LCPUFA) have been associated to many benefits for human health. n-3 LCPUFA, such as EPA and DHA, have protective roles in cardiovascular health and in the functionality and integrity of the central nervous system. Currently, the possible therapeutic uses of these fatty acids is expanding, attributing their positive effects not only for the treatment of cardiovascular and neurodegenerative diseases, but also seeing it as an effective alternative in the management of NAFLD. The present review analyzes the potential use of n-3 LCPUFA in the treatment and protection of NAFLD.

Lipotoxicidade na leptospirose humana: aspectos prognósticos e potencial efeito benéfico da administração de albumina / Lipotoxicity in human leptospirosis: prognostics aspects and potential beneficial effect of albumin administration

A leptospirose humana é uma doença infecciosa aguda de amplo espectro clínico e que cursa com alterações metabólicas e dislipidêmicas envolvendo colesterol total e frações, triglicerídeos e ácidos graxos não esterificados (AGNEs). Dentre os mecanismos celulares envolvidos na sua fisiopatologia encontram-se a inibição da enzima Na, K ATPase pela endotoxina GLP e a lipotoxicidade, ambos agravados pela redução dos níveis circulantes da albumina, molécula que exerce um papel fundamental na adsorção de moléculas lipídicas. Neste estudo observacional, determinamos as concentrações séricas de bilirrubina, creatinina e albumina e, pela técnica de cromatografia líquida de alta performance, a concentração sérica dos AGNEs de cadeia longa (C16: C18) de 27 pacientes com síndrome de Weil durante o período de internação hospitalar, dos quais cinco vieram a falecer. Verificamos correlações significantes (p<0,05) ao longo da internação hospitalar, nas concentrações séricas de marcadores bioquímicos de gravidade da doença (bilirrubina, creatinina e albumina), AGNEs, ácido oléico e ácido linoléico, e relação molar ácido oléico/albumina, com r (Pearson) de -0,7981, -0,7699, 0,9014, -0,8795 -0,9816, -0,9694, -0,9821, respectivamente. A relação molar ácido oléico/albumina e ácido oléico+linoléico/albumina foi significantemente mais elevada nos pacientes que faleceram (p<0,001), retornando aos valores semelhantes aos do grupo controle nos pacientes que evoluíram para a cura. Na análise por Curva Roc, a relação molar ácido oléico/albumina se mostrou um bom teste preditivo, com valor de corte 0,705 associado com maior especificidade e sensibilidade prognóstica. Nossos resultados sugerem que a utilização parenteral da albumina humana em pacientes com leptospirose pode ser uma potente ferramenta terapêutica nos casos mais graves ao interferir positivamente no resgate do equilíbrio bioquímico das relações molares ácido oléico/algumina e ácido oléico+linoléico/algumina.

Human leptospirosis is an acute infectious disease with a broad clinical spectrum. It courses with metabolic and dyslipidemic alterations, involving total cholesterol and fractions, triglycerides and nonesterified fatty acids (NEFAs). The cellular mechanisms involved in its pathogenesis include the inhibition of the enzyme sodium-potassium adenosine triphosphatase and lipotoxicity. Both mechanisms are aggravated by the reduction of serum levels of albumin, a molecule that plays a fundamental role in the absorption of lipid molecules. In this observational study, we determined the serum concentrations of bilirubin, creatinine and albumin, and, by High Performance Liquid Chromatography, the serum concentrations of long chain NEFAs (C16: C18) during the period of hospitalization of 27 patients with Weil's syndrome, five of whom progressed to death. Significant correlations were found between the length of hospitalization and serum concentrations of biochemical markers of severity (bilirubin, creatinine, albumin), NEFAs, oleic acid and linoleic acid, and the oleic acid: albumin molar ratio, with r (Pearson) of de -0,7981, -0,7699, 0,09014, -0,8795 -0,9816, -0,9694, -09821 respectively. The oleic acid: albumin molar ratio and oleic-plus-linoleic acid: albumin molar ratio were significantly higher in the patients who progressed to death, whereas in the cured patients this ratio decreased to levels that were similar to those found in the control group. Roc Curve analysis for the acid oleic: albumin molar ratio proved a good predictive test, with value of cutting 0.705 associated with greater specificity and prognostic sensitivity. Our results suggest that parenteral administration of human albumine may interfere positively in the rescue of biochemical balance of oleic acid: albumin molar ratio and oleic-plus-linoleic acid: albumin molar ratio and be a therapeutic tool for severe cases of leptospirosis.