Insulin Resistance, Inflammation, and Obesity: Role of Monocyte Chemoattractant Protein-1 (or CCL2) in the Regulation of Metabolism

To maintain homeostasis under diverse metabolic conditions, it is necessary to coordinate nutrient-sensing pathways with the immune response. This coordination requires a complex relationship between cells, hormones, and cytokines in which inflammatory and metabolic pathways are convergent at multiple levels. Recruitment of macrophages to metabolically compromised tissue is a primary event in which chemokines play a crucial role. However, chemokines may also transmit cell signals that generate multiple responses, most unrelated to chemotaxis, that are involved in different biological processes. We have reviewed the evidence showing that monocyte chemoattractant protein-1 (MCP-1 or CCL2) may have a systemic role in the regulation of metabolism that sometimes is not necessarily linked to the traffic of inflammatory cells to susceptible tissues. Main topics cover the relationship between MCP-1/CCL2, insulin resistance, inflammation, obesity, and related metabolic disturbances

Methodological constraints in interpreting serum paraoxonase-1 activity measurements: an example from a study in HIV-infected patients

<p>Abstract</p> <p>Background</p> <p>Paraoxonase-1 (PON1) is an antioxidant enzyme that attenuates the production of the monocyte chemoattractant protein-1 (MCP-1) <it>in vitro</it>. Although oxidation and inflammation are closely related processes, the association between PON1 and MCP-1 has not been completely characterised due, probably, to that the current use of synthetic substrates for PON1 measurement limits the interpretation of the data. In the present study, we explored the relationships between the circulating levels of PON1 and MCP-1 in human immunodeficiency virus-infected patients in relation to the multifunctional capabilities of PON1.</p> <p>Methods</p> <p>We measured selected variables in 227 patients and in a control group of 409 participants. Serum PON1 esterase and lactonase activities were measured as the rates of hydrolysis of paraoxon and of 5-(thiobutyl)-butyrolactone, respectively. Oxidised LDL and MCP-1 concentrations were determined by enzyme-linked immunosorbent assay. High-density lipoproteins cholesterol, apolipoprotein A-I, and C-reactive protein concentrations were measured by standard automated methods.</p> <p>Results</p> <p>There were significant relationships between PON1 activity and several indices of oxidation and inflammation in control subjects and in infected patients. However, these relationships varied not only with disease status but also on the type of substrate used for PON1 measurement.</p> <p>Conclusion</p> <p>The present study is a cautionary tale highlighting that results of clinical studies on PON1 may vary depending on the methods used as well as the disease studied. Until more specific methods using physiologically-akin substrates are developed for PON1 measurement, we suggest the simultaneous employment of at least two different substrates in order to improve the reliability of the results obtained.</p

Treatment of hypertriglyceridemia and HIV: fenofibrate-induced changes in the expression of chemokine genes in circulating leukocytes

Fenofibrate changed the expression of chemokine genes in circulating leukocytes of HIV-infected patients with hypertriglyceridemia. The data suggest that fenofibrate when effective in the treatment of lipoprotein abnormalities, may act as a modulator of systemic inflammation. This particular action, therefore, may also influence the clinical course of the disease

PPARs in Regulation of Paraoxonases: Control of Oxidative Stress and Inflammation Pathways

The paraoxonase (PON) group of enzymes, composed of PON1, PON2, and PON3, play an important role in decreasing oxidative stress by degrading lipid peroxides. PON1 synthesis is upregulated by PPAR. Several pharmacological compounds (acting as antioxidants and, hence, atheroprotective) stimulate both PPAR activity and PON1 expression. Recent evidence suggests that PON1 and the monocyte chemoattractant protein-1 (MCP-1) are involved in coordinating the inflammatory response in damaged tissues; PPAR may be central in the regulation of these biochemical pathways. This article reviews the state of knowledge on PON1 biochemistry and function, the influence of genetic variation, and the regulation of PON1 expression by pharmaceutical compounds that increase PPAR activity. We also describe recent lines of evidence suggesting links between PON1 and MCP-1 and how their production may be regulated by PPAR

Effectiveness of a motivational intervention on overweight/obese patients in the primary healthcare: a cluster randomized trial

Background: Overweight and obesity are common health problems which increase the risk of developing several serious health conditions. The main difficulty in the management of weight-loss lies in its maintenance, once it is achieved. The aim of this study was to investigate whether a motivational intervention, together with current clinical practice, was more efficient than a traditional intervention, in the treatment of overweight and obesity and whether this intervention reduces cardiovascular risk factors associated with overweight and obesity. Methods: Multi-centre cluster randomized trial with a 24-month follow-up included 864 overweight/obese patients randomly assigned. Motivational intervention group (400 patients), delivered by a nurse trained by an expert psychologist, in 32 sessions, 1 to 12 fortnightly, and 13 to 32, monthly, on top of their standard programmed diet and exercise. The control group (446 patients), received the usual follow-up. Results: Weight reduction was statistically significant in the second year with a mean reduction of 1.0 Kg in the control group and 2.5 Kg in the intervention group (p = 0. 02). While 18.1% of patients in the control group reduced their weight by more than 5%, this percentage rose to 26.9% in the intervention group, which is statistically significant (p = 0.04). Patients in the motivational intervention group had significantly greater improvements in triglycerides and APOB/APOA1ratio. Conclusions: The results highlight the importance of the group motivational interview in the treatment of overweight /obese patients in primary care, and in the improvement of their associated cardiovascular risks factors. Trial registration: ClinicalTrials.gov Identifier: NCT01006213 October 30, 2009. Keywords: Overweight, Obesity, Motivational interview, Weight-loss, Cardiovascular risk factor

Decreased paraoxonase-1 activity is associated with alterations of high-density lipoprotein particles in chronic liver impairment

<p>Abstract</p> <p>Background</p> <p>Paraoxonase-1 (PON1), a lactonase synthesized by the liver, circulates in blood bound to high-density lipoproteins (HDL). This enzyme is thought to degrade oxidized phospholipids and play an important role in the organism's antioxidant and anti-inflammatory system. Chronic liver diseases are characterized by decreased serum PON1 activity. The aim of the present study was to investigate the compositional changes in HDL that could influence PON1 activity in liver impairment.</p> <p>Methods</p> <p>The study was performed in samples from five patients with advanced liver cirrhosis and with preserved renal function, chosen on the basis of having low serum PON1 activity and high serum PON1 concentration. As a control group, we accessed five healthy volunteers from among our hospital staff. Lipid and protein compositional analysis of lipoprotein particles were done by high-performance liquid chromatography, gel electrophoresis, and Western-Blot.</p> <p>Results</p> <p>HDL particles from cirrhotic patients had an increased phospholipid content that was inversely correlated to PON1 activity. The HDL particles contained high levels of PON1 that corresponded, in part, to an immunoreactive protein of high molecular weight (55 kDa) not present in control subjects. This protein was identified as glycosylated PON1 and was also present in biopsies from patients with steatosis and from rats with CCl₄-induced hepatic impairment. These changes were associated with an increased plasma concentration of markers of oxidative stress, inflammation and fibrogenesis.</p> <p>Conclusion</p> <p>Abnormalities in the composition of lipids and proteins of HDL particles, including PON1 glycosylation, are associated with the decrease in serum PON1 activity in patients with liver disease. These alterations may adversely affect the protective role of HDL against oxidative stress and inflammation in these patients.</p

The Deleterious Influence of Tenofovir-Based Therapies on the Progression of Atherosclerosis in HIV-Infected Patients

We investigated the potential differential effects of antiretroviral therapies on unbalanced chemokine homeostasis and on the progression of atherosclerosis in HIV-infected patients. A two-year prospective study was performed in 67 consecutive HIV-infected patients initiating antiretroviral therapy with abacavir/lamivudine or tenofovir/emtricitabine. Circulating levels of inflammatory biomarkers, progression of subclinical atherosclerosis and expression levels of selected chemokines genes in circulating leukocytes were assessed. Control subjects showed significantly lower plasma concentrations of CRP, tPA, IL-6, and MCP-1 than HIV-infected patients at a baseline. After two years of followup, the observed decreases in plasma inflammatory biomarker levels were only significant for MCP-1, tPA, and IL-6. The decrease in plasma MCP-1 concentration was associated with the progression of atherosclerosis, and this effect was negligible only in patients receiving TDF-based therapy. Multivariate analysis confirmed that treatment with TDF was positively and significantly associated with a higher likelihood of subclinical atherosclerosis progression. However, the expression levels of selected genes in blood cells only showed associations with the viral load and total and HDL-cholesterol levels. Current antiretroviral treatments may partially attenuate the influence of HIV infection on certain inflammatory pathways, though patients receiving TDF therapy must be carefully monitored with respect to the presence and/or progression of atherosclerosis

Effect of TNF-a genetic variants and CCR5 Delta 32 on the vulnerability to HIV-1 infection and disease progression in Caucasian Spaniards

Background: Tumor necrosis factor alpha (TNF-α) is thought to be involved in the various immunogenetic events that influence HIV-1 infection. Methods: We aimed to determine whether carriage of the TNF-α-238G>A, -308G>A and -863 C>A gene promoter single nucleotide polymorphisms (SNP) and the CCR5Δ32 variant allele influence the risk of HIV-1 infection and disease progression in Caucasian Spaniards. The study group consisted of 423 individuals. Of these, 239 were uninfected (36 heavily exposed but uninfected [EU] and 203 healthy controls [HC]) and 184 were HIV-1-infected (109 typical progressors [TP] and 75 long-term nonprogressors [LTNP] of over 16 years' duration). TNF-α SNP and the CCR5Δ32 allele were assessed using PCR-RFLP and automatic sequencing analysis methods on white blood cell DNA. Genotype and allele frequencies were compared using the χ 2 test and the Fisher exact test. Haplotypes were compared by logistic regression analysis. Results: The distribution of TNF-α-238G>A, -308G>A and -863 C>A genetic variants was non-significantly different in HIV-1-infected patients compared with uninfected individuals: -238G>A, p = 0.7 and p = 0.3; -308G>A, p = 0.05 and p = 0.07; -863 C>A, p = 0.7 and p = 0.4, for genotype and allele comparisons, respectively. Haplotype analyses, however, indicated that carriers of the haplotype H3 were significantly more common among uninfected subjects (p = 0.04). Among the infected patients, the distribution of the three TNF-α genetic variants assessed was non-significantly different between TP and LTNP: -238G>A, p = 0.35 and p = 0.7; -308G>A, p = 0.7 and p = 0.6: -863 C>A, p = 0.2 and p = 0.2, for genotype and allele comparisons, respectively. Haplotype analyses also indicated non-significant associations. Subanalyses in the LTNP subset indicated that the TNF-α-238A variant allele was significantly overrepresented in patients who spontaneously controlled plasma viremia compared with those who had a detectable plasma viral load (genotype comparisons, p = 0.02; allele comparisons, p = 0.03). The CCR5Δ32 distribution was non-significantly different in HIV-1-infected patients with respect to the uninfected population (p = 0.15 and p = 0.2 for genotype and allele comparisons, respectively) and in LTNP vs TP (p = 0.4 and p = 0.5 for genotype and allele comparisons, respectively). Conclusions: In our cohort of Caucasian Spaniards, TNF-α genetic variants could be involved in the vulnerability to HIV1 infection. TNF-α genetic variants were unrelated to disease progression in infected subjects. The -238G>A SNP may modulate the control of viremia in LTNP. Carriage of the CCR5Δ32 variant allele had no effect on the risk of infection and disease progression

Development and feasibility of 4 checklists for the evaluation of comorbidity in patients with rheumatoid arthritis, axial spondyloarthritis and psoriatic arthritis: GECOAI Project

Objective: To develop and assess the feasibility in daily practice of four comorbidity checklists, for common use in rheumatoid arthritis (RA), axial spondyloarthritis (axSpA) and psoriatic arthritis (PsA). Methods: A multidisciplinary panel of experts on comorbidity was established. Data from the GECOAR, GECOAX and GECOAP projects were analysed and a narrative literature review in Medline on RA, axSpA and PsA comorbidity was performed in order to select the most relevant and common comorbidities across the three diseases. With these results and those obtained from a focus group of patients, in a nominal group meeting, the experts generated preliminary checklists. These were afterwards modified by an external evaluation by two associations, a patients’ association and an association of health professionals related to rheumatology. As a result, the final checklists were generated. A cross-sectional study was conducted to test the feasibility of three of the checklists in daily practice, in which eight health professionals evaluated the checklists in five patients with RA, five with axSpA and five with SpA. Results: Four comorbidity checklists were designed, three for health professionals (one to assess current comorbidity, one on prevention/health promotion and one with the referral criteria to other health professionals), and another for patients. The feasibility study showed them to be simple, clear, and useful for use in routine clinical practice. Conclusions: The use of specific and common checklists for patients with RA, axSpA and PsA is feasible and might contribute favorably to their prognosis as well as in daily practice.Este proyecto fue financiado por Merck Sharp & Dohme® España y avalado por las siguientes asociaciones/sociedades: CONARTRITIS (Coordinadora Nacional de Artritis asociación, de pacientes que representa a las personas afectadas por AR, APs, AIJ y EspA), OPENREUMA (Asociación de otros profesionales sanitarios dedicados a la reumatología) y SORCOM (Sociedad de Reumatología de la Comunidad de Madrid

V Congreso de Innovación Docente en Ingeniería Química - CIDIQ

Innovación EducativaDeterminadas asignaturas del Grado en Ingeniería Química de la Universidad de Valladolid tienen incluida en la memoria VERIFICA del Grado el desarrollo de la competencia general de capacidad de trabajar en equipo de forma eficaz (CG9). Hasta el momento, en las asignaturas implicadas, se ha hecho un esfuerzo importante en el diseño de actividades concretas que permitan desarrollar esta competencia transversal y se han elaborado determinados instrumentos basados en la utilización de rúbricas para su correcta evaluación. Sin embargo, no se ha prestado demasiada atención en enseñar a los estudiantes a construir auténticos equipos de trabajo. En este sentido, el panel Team Canvas, es una herramienta gratuita disponible para que el profesor pueda alinear a los miembros de un equipo, resolver conflictos y construir una cultura de trabajo en equipo ágil y productiva. El panel consta de cuatro partes: 1) Funciones y objetivos (personales y comunes); 2) Propósito y valores; 3) Fortalezas, Debilidades y Necesidades; 4) Normas y Actividades. Este panel lo pueden emplear los profesores implicados en la dirección de tareas grupales cuando necesiten clarificar las metas de un equipo, averiguar sus motivaciones, ayudarles a ser más productivos y conseguir que estén alineados con los objetivos. Se puede utilizar cuando el profesor crea un nuevo equipo de trabajo, cuando se detectan problemas en el funcionamiento del equipo, cuando se incorpora un nuevo miembro o para realizar una revisión del trabajo realizado hasta la fecha. Para aplicar esta plantilla Team Canvas el profesor debe de disponer de un tiempo de 90-120 minutos y explicarles a los estudiantes el objetivo de esa sesión. Los estudiantes deben de completar los distintos campos de la plantilla mediante el uso de post-its. Cada miembro del equipo se debe expresar libremente, aunque en ciertos apartados necesitarán de un consenso entre sus miembros. De esta forma irán completando los diferentes apartados: Personas y roles (5 minutos), Objetivos comunes (10 minutos), Metas personales (5 minutos), Fortalezas y activos (15 minutos), Debilidades y áreas de desarrollo (15 minutos), Necesidades y expectativas (10 minutos), Reglas y actividades (10 minutos), Valores (10 minutos). Como cierre de la sesión se pide al equipo que escriba en un post-it una frase que defina el objetivo común del equipo y si es posible que le asigne un nombre al equipo. La propuesta de crear equipos de trabajo basada en la plantilla Team Canvas se va a aplicar en las asignaturas de Tecnología Ambiental y de Procesos (obligatoria de 1er curso de los Grados en Ingenierías Industriales de la Universidad de Valladolid, 6 ECTS) y en Introducción en Ingeniería Química (obligatoria de 3er curso, 6ECTS del Grado en Ingeniería Química). Los resultados previsibles de aplicación de esta nueva metodología de trabajo serán una mejora en el desarrollo por parte de los estudiantes de la competencia de trabajo en equipo. Los estudiantes se sentirán parte del equipo de trabajo, compartirán objetivos comunes y responsabilidades y aprenderán a utilizar el mejor potencial de cada integrante del equipo. Desde el punto de vista del profesor esta metodología Team Canvas permitirá mejorar la capacidad de gestión de los conflictos de los equipos y lograr una mayor comunicación estudiante-profesor