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Title: Obesity induced alterations in redox homeostasis and oxidative stress are present from an early age.
Authors: Lechuga-Sancho, Alfonso M
Gallego-Andujar, David
Ruiz-Ocaña, Pablo
Visiedo, Francisco M
Saez-Benito, Ana
Schwarz, Mónica
Segundo, Carmen
Mateos, Rosa M
metadata.dc.subject.mesh: Age Factors
Blood Glucose
Child, Preschool
Glucose Tolerance Test
Insulin Resistance
Oxidative Stress
Pilot Projects
Prospective Studies
Issue Date: 25-Jan-2018
Abstract: Oxidative stress and inflammation have been postulated as underlying mechanisms for the development of obesity-related insulin resistance. This association however, remains elusive especially in childhood. We sought to investigate this relation by measuring oxidative stress and antioxidant response biomarkers, before and during an oral glucose tolerance test (OGTT), in different biological samples from obese children. 24 children were recruited for the study, (18 obese and 6 controls). After OGTT, the obese group was subdivided in two, according to whether or not carbohydrate metabolic impairment (Ob.IR+, Ob.IR-; respectively) was found. Different biomarkers were analyzed after fasting (T = 0) and during an OGTT (T = 60 and 120 min). Lipoperoxides were measured in plasma, erythrocytes, and urine; while advanced glycation end products were determined in plasma, and redox status (GSH/GSSG ratio) in erythrocytes. We found marked differences in the characterization of the oxidative status in urine and erythrocytes, and in the dynamics of the antioxidant response during OGTT. Specifically, Ob.IR+ children show increased oxidative stress, deficient antioxidant response and a significant imbalance in redox status, in comparison to controls and Ob.IR- children. Obese children with insulin resistance show increased levels of oxidative stress biomarkers, and a stunted antioxidant response to an OGTT leading to increased oxidative stress after a single glucose load, as detected in erythrocytes, but not in plasma. We propose erythrocytes as sensors of early and acute changes in oxidative stress associated with insulin resistance in childhood obesity. This is a pilot study, performed with a limited sample size, so data should be interpreted with caution until reproduced.
metadata.dc.identifier.doi: 10.1371/journal.pone.0191547
Appears in Collections:Producción 2020

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