Electrochemical immunosensing of low-density lipoprotein based on sol-gel encapsulation

Abstract Lipoprotein monitoring is desirable in the management of medical conditions such as atherosclerotic cardiovascular disease and coronary artery disease, in which controlling the concentration of these chylomicrons is crucial. Current clinical methods are complex and present poor reproducibility between laboratories. For these reasons, recent guidelines discard the assessment of low-density lipoprotein cholesterol (LDL-C) as a routine analysis during lipid-lowering therapies. Concerning the importance of monitoring this parameter, the authors present an electrochemical immunosensor constructed from a simple and easy-to-reproduce platform that allows detecting and quantifying LDL nanoparticles directly from human serum samples. The performance of the biosensor was studied by scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The biosensing platform displays good stability and linearity between 30 mg dL-1 and 135 mg dL-1 with a detection limit of 20 mg dL-1. The proposed biosensor can be easily employed for monitoring LDL concentration in clinical treatments.

Relationship between C -reactive protein and other cardiovascular risk factors in hypercholesterolemic individ alsa / Relação entre a proteína C reativa e os fatores de risco para doenças cardiovasculares em indivíduos hipercolesterolêmicos

Objective: To evaluate the correlation between ultrasensitive C-reactive protein (us-CRP) and markers of cardiovascular risk in hypercholesterolemic adults of differing nutritional status. Methods: Forty-six hypercholesterolemic subjects (7 men: 30 to 70 years; 39 women: 45 to 70 years) with total cholesterol >240 mg/dL were studied. Anthropometric variables (weight, height, and waist and hip circumference) were measured, as well as us-CRP, total cholesterol (TC), HDL-C, LDL-C, VLDL-C, triglycerides, apolipoprotein AI, apolipoprotein B, glucose and fasting insulin, and homeostasis model assessment (HOMA-IR) of insulin resistance. Spearman correlations and multiple linear regression analysis were performed at a level of significance of 5%. Results: Plasma levels of triglycerides, VLDL-C, glucose, HDL-C and us-CRP were higher in overweight subjects (p<0.05). Ultrasensitive CRP was positively correlated with body mass index (r=0.32) and hip circumference (r=0.30), as well as with TC (r=0.33), apolipoprotein B (r=0.36) and glucose (r=0.42). Regression analysis showed that us-CRP concentration was positively associated with TC, glucose, and waist-hip ratio. These parameters explained 41% of the variability in us-CRP. Conclusion: Obese individuals present a higher concentration of us-CRP, fasting glucose, triglycerides, and VLDL-C. Excess weight is associated with us-CRP, a finding highlighting the importance of this biomarker for the detection of individuals at cardiovascular risk.

Objetivo: Avaliar a correlação entre a proteína C reativa ultrasensível (PCR-us) e os marcadores clássicos de risco cardiovascular em adultos hipercolesterolêmicos em diferentes estados nutricionais. Métodos: Amostra de 46 indivíduos hipercolesterolêmicos (7 homens: 30 a 70 anos e 39 mulheres: 45 a 70 anos) com colesterol total (CT) >240 mg/dL. Realizou-se determinações antropométricas como peso, altura, circunferência da cintura (CC) e do quadril (CQ), além de medidas plasmáticas de PCR-us, CT, HDL-C, LDL-C, VLDL-C, triglicerídeos (TG), apolipoproteína AI (Apo AI), apolipoproteína B (Apo B), glicose e insulina de jejum e HOMA-IR. Realizou-se correlações de Spearman e análise de regressão linear múltipla ao nível de significância de 5%. Resultados: Os níveis plasmáticos de TG, VLDL-C, glicose, HDL-C e PCR-us foram maiores em indivíduos com sobrepeso (p<0,05). A PCR-us foi positivamente correlacionada com o índice de massa corporal (r=0,32) e com a CQ (r=0,30), bem como com o CT (r=0,33), Apo B (r=0,36) e glicose (r=0,42). A análise de regressão mostrou que a concentração de PCR-us foi positivamente associada ao CT, glicose e razão cintura-quadril. Esses parâmetros explicam a variabilidade da PCR-us em 41%. Conclusão: Os indivíduos obesos têm maior concentração plasmática de PCR-us, glicose, TG e VLDL-C. O excesso de peso está correlacionado com a PCR-us, mostrando a importância deste biomarcador para triagem de indivíduos de risco cardiovascular.

Evaluación del riesgo cardiovascular en trabajadores de institución financiera de la ciudad de Guatemala / Evaluation of the cardiovascular risk in workers of financial institution of the city of Guatemala

Las enfermedades cardiovasculares son una epidemia a nivel mundial y en países en vías de desarrollo, laincidencia y prevalencia han ido en aumento. Objetivo: El objetivo general fue determinar la prevalencia defactores de riesgo para el desarrollo de enfermedad cardiovascular en un grupo de personas económicamente activas. Métodos: Estudio descriptivo transversal que incluyó a todos los trabajadores de la institución que voluntariamente dieron una muestra de sangre y de orina, y se sometieron a una evaluación clínica durante los meses de junio de 2011 a julio del 2012. Resultados: incluimos 532 participantes, edad promedio 38años(19-65años), 69% de sexo masculino, 23% hipertensión arterial, 7% pre-hipertensión, 8% de tabaquismo, obesidad 16%, 36% sobrepeso, 35% hipercolesterolemia, 31% hipertrigliceridemia, 59% HDL<40mg/dl, 62% LDL >100mg/dl, glicemia preprandial alterada 4%, 14% hiperuricemia, 1% muy alto riesgocardiovascular, 17% alto riesgo. Conclusiones: Los factores de riesgo cardiovascular tienen una alta prevalencia en la población de estudio, a pesar de tratarse de una población joven.

Cardiovascular diseases are epidemic globally and in developing countries, the incidence and prevalence have increased. Objective: The objective was to determine the prevalence of risk factors for the development of cardiovascular disease in a group of economically active people. Methods: A cross sectional study that included all employees of the institution who voluntarily gave a blood sample and urine, and underwent a clinical evaluation during the months of June 2011 to July 2012. Results: We included 532 participants, meanage 38years (19-65años), 69%male, 23% hypertension, pre hypertension 7%, 8% smoking, obesity16%,36% overweight, 35% hypercholesterolemia, hypertriglyceridemia 31%, 59%HDL <40mg/dL, 62%LDL> 100mg/dl, altered fasting glucose4%, 14% hyperuricemia, 1% very high cardiovascular risk, 17% higher risk. Conclusions: Cardiovascular risk factors are highly prevalent in the study population, despite being a young population.

Hipercolesterolemia / Hypercholesterolemia

The relationship between hypercholesteroemia and coronary heart disease is well established. Clinical and experimental investigations have shown that high serum levels of cholesterol are associated wuth increased atherogenesis. The author presentes and extensive revisión about hypercholesterolemia, its classification and treatment. Reogarding the treatment, astects of the diet and the current available drugs are considered in detail