Serum chemerin in a cohort of Colombian patients with primary osteoarthritis.

BACKGROUND AND PURPOSE: Osteoarthritis (OA) is considered the most common degenerative joint pathology in the adult population, being an important cause of disability worldwide, and its prevalence is increasingly associated with different factors, including obesity. Obesity together with metabolic syndrome have been associated with a pro-inflammatory state due to the release of cytokines that induce changes in cartilage metabolism. Chemerin is an adipokine secreted mainly by adipocytes and its final action is to increase the production of IL-6, IL-8, IL-1b, TNF-a and metalloproteinases by macrophages, dendritic cells and chondrocytes, which are responsible for damage to the articular cartilage. This is one of the reasons that obesity and inflammation have been linked to OA. The main objective of this study is to determine whether the serum chemerin concentrations of a group of patients with primary OA are higher when compared with control individuals. A further purpose of the study is to determine the relationship between the presence of obesity/overweight with the severity of the disease measured by a radiological scale. PATIENTS AND METHODS: An analytical cross-sectional study was carried out where serum chemerin levels were quantified by enzyme-linked immunoadsorption assay (ELISA), in patients with primary OA of the hip, knee and hand with criteria from the ACR (American College Of Rheumatology) and controls. Radiological studies of patients and controls were analysed to determine the severity of joint involvement using the Kellgren and Lawrence (KL) classification system. The statistical significance of the difference in serum chemerin values between the two groups was verified and the correlation between the variables of body mass index (BMI) with radiological severity, number of joint regions and serum chemerin levels was analysed. RESULTS: During the period from July 2015 to July 2016, serum samples and radiographs of compromised joints were collected from 40 patients with primary OA who met the inclusion criteria, as well as serum samples from 20 controls. The average concentration of chemerin was higher in the group of patients with OA compared to that of the control group, being 373ng / ml and 175.55ng / ml respectively (p<2.2×10-16). No significant associations were found between the different degrees of disease severity measured by the KL radiological scale, such as the number of involved joint regions and BMI. CONCLUSIONS: In a group of patients with primary OA of the hand, knee or hip, the values of chemerin were higher than those found in controls, without significant association with the severity of the disease established radiologically by K/L scale, the number of involved joint regions, and the BMI.

Quemerina sérica en una cohorte de pacientes colombianos con osteoartritis primaria / Serum chemerin in a cohort of Colombian patients with primary osteoarthritis

Antecedentes y objetivo: La osteoartritis (OA) es considerada como la enfermedad articular degenerativa más frecuente en la población adulta, siendo una causa importante de discapacidad a nivel mundial, y su prevalencia va en aumento asociada a diferentes factores entre ellos la obesidad. La obesidad junto con el síndrome metabólico se han asociado con un estado pro inflamatorio debido a la liberación de citocinas que inducen cambios en el metabolismo del cartílago. La quemerina es una adipocina secretada principalmente por adipocitos, y tiene como acción final, el aumento de la producción de IL-6, IL-8, IL-1b, TNF-a y metaloproteinasas por parte de macrófagos, células dendríticas y condrocitos, las cuales son encargadas del daño del cartílago articular. Esta es una de las razones por la que se ha relacionado la obesidad y la inflamación con la OA. El objetivo principal de este estudio consiste en determinar si las concentraciones de quemerina en suero de un grupo de pacientes con OA primaria son mayores al compararlos con individuos controles sanos; y adicionalmente determinar la relación entre la presencia de obesidad/sobrepeso con la severidad de la enfermedad medida por una escala radiológica. Pacientes y métodos: Se realizó un estudio de corte transversal analítico donde se cuantificaron los niveles de quemerina en suero mediante ensayo por inmunoadsorción ligado a enzimas (ELISA), en pacientes con OA primaria de cadera, rodilla y mano con criterios del American College Of Reumathology (ACR) y controles sanos. Se analizaron los estudios radiológicos de los pacientes y controles para determinar la severidad del compromiso articular aplicando el sistema de clasificación de Kellgren y Lawrence (KL).(AU)

Background and purpose: Osteoarthritis (OA) is considered the most common degenerative joint pathology in the adult population, being an important cause of disability worldwide, and its prevalence is increasingly associated with different factors, including obesity. Obesity together with metabolic syndrome have been associated with a pro-inflammatory state due to the release of cytokines that induce changes in cartilage metabolism. Chemerin is an adipokine secreted mainly by adipocytes and its final action is to increase the production of IL-6, IL-8, IL-1b, TNF-α and metalloproteinases by macrophages, dendritic cells and chondrocytes, which are responsible for damage to the articular cartilage. This is one of the reasons that obesity and inflammation have been linked to OA. The main objective of this study is to determine whether the serum chemerin concentrations of a group of patients with primary OA are higher when compared with control individuals. A further purpose of the study is to determine the relationship between the presence of obesity/overweight with the severity of the disease measured by a radiological scale. Patients and methods: An analytical cross-sectional study was carried out where serum chemerin levels were quantified by enzyme-linked immunoadsorption assay (ELISA), in patients with primary OA of the hip, knee and hand with criteria from the American College Of Rheumatology (ACR) and controls. Radiological studies of patients and controls were analysed to determine the severity of joint involvement using the Kellgren and Lawrence (KL) classification system. The statistical significance of the difference in serum chemerin values between the two groups was verified and the correlation between the variables of body mass index (BMI) with radiological severity, number of joint regions and serum chemerin levels was analysed.(AU)

Serum chemerin in a cohort of Colombian patients with primary osteoarthritis. / Quemerina sérica en una cohorte de pacientes colombianos con osteoartritis primaria.

BACKGROUND AND PURPOSE: Osteoarthritis (OA) is considered the most common degenerative joint pathology in the adult population, being an important cause of disability worldwide, and its prevalence is increasingly associated with different factors, including obesity. Obesity together with metabolic syndrome have been associated with a pro-inflammatory state due to the release of cytokines that induce changes in cartilage metabolism. Chemerin is an adipokine secreted mainly by adipocytes and its final action is to increase the production of IL-6, IL-8, IL-1b, TNF-α and metalloproteinases by macrophages, dendritic cells and chondrocytes, which are responsible for damage to the articular cartilage. This is one of the reasons that obesity and inflammation have been linked to OA. The main objective of this study is to determine whether the serum chemerin concentrations of a group of patients with primary OA are higher when compared with control individuals. A further purpose of the study is to determine the relationship between the presence of obesity/overweight with the severity of the disease measured by a radiological scale. PATIENTS AND METHODS: An analytical cross-sectional study was carried out where serum chemerin levels were quantified by enzyme-linked immunoadsorption assay (ELISA), in patients with primary OA of the hip, knee and hand with criteria from the American College Of Rheumatology (ACR) and controls. Radiological studies of patients and controls were analysed to determine the severity of joint involvement using the Kellgren and Lawrence (KL) classification system. The statistical significance of the difference in serum chemerin values between the two groups was verified and the correlation between the variables of body mass index (BMI) with radiological severity, number of joint regions and serum chemerin levels was analysed. RESULTS: During the period from July 2015 to July 2016, serum samples and radiographs of compromised joints were collected from 40 patients with primary OA who met the inclusion criteria, as well as serum samples from 20 controls. The average concentration of chemerin was higher in the group of patients with OA compared to that of the control group, being 373 ng / ml and 175.55 ng / ml respectively (p<2.2×10-16). No significant associations were found between the different degrees of disease severity measured by the KL radiological scale, such as the number of involved joint regions and BMI. CONCLUSIONS: In a group of patients with primary OA of the hand, knee or hip, the values of chemerin were higher than those found in controls, without significant association with the severity of the disease established radiologically by K/L scale, the number of involved joint regions, and the BMI.