| Autor: |
Flores-Cortez YA; Laboratory of Molecular Biology and Genomic, Faculty of Biological Chemical Sciences, Autonomous University of Guerrero, Chilpancingo, Guerrero 39087, Mexico., Barragán-Bonilla MI; Laboratory of Molecular Biology and Genomic, Faculty of Biological Chemical Sciences, Autonomous University of Guerrero, Chilpancingo, Guerrero 39087, Mexico., Mendoza-Bello JM; Laboratory of Molecular Biology and Genomic, Faculty of Biological Chemical Sciences, Autonomous University of Guerrero, Chilpancingo, Guerrero 39087, Mexico., González-Calixto C; Faculty of Nursing, Autonomous University of Guerrero, Acapulco, Guerrero 39610, Mexico., Flores-Alfaro E; Laboratory of Clinical and Molecular Epidemiology, Faculty of Biological and Chemical Sciences, Autonomous University of Guerrero, Chilpancingo, Guerrero 39087, Mexico., Espinoza-Rojo M; Laboratory of Molecular Biology and Genomic, Faculty of Biological Chemical Sciences, Autonomous University of Guerrero, Chilpancingo, Guerrero 39087, Mexico. |
| Abstrakt: |
Obesity is a multifactorial disease, defined as excessive fat deposition in adipose tissue. Adipose tissue is responsible for the production and secretion of numerous adipokines that induce metabolic disorders. Retinol‑binding protein 4 (RBP4) is an adipokine that transports vitamin A or retinol in the blood. High levels of RBP4 are associated with development of metabolic disease, including obesity, insulin resistance (IR), metabolic syndrome, and type 2 diabetes (T2D). The present review summarizes the role of RBP4 in obesity and associated chronic alterations. Excessive synthesis of RBP4 contributes to inflammatory characteristic of obesity by activation of immune cells and release of proinflammatory cytokines, such as TNFα and ILs, via the Toll‑like receptor/JNK pathway. The retinol‑RBP4 complex inhibits insulin signaling directly in adipocytes by activating Janus kinase 2 (JAK2)/STAT5/suppressor of cytokine signaling 3 signaling. This mechanism is retinol‑dependent and requires vitamin A receptor stimulation by retinoic acid 6 (STRA6). In muscle, RBP4 is associated with increased serine 307 phosphorylation of insulin receptor substrate‑1, which decreases its affinity to PI3K and promotes IR. In the liver, RBP4 increases hepatic expression of phosphoenolpyruvate carboxykinase, which increases production of glucose. Elevated serum RBP4 levels are associated with β‑cell dysfunction in T2D via the STRA6/JAK2/STAT1/insulin gene enhancer protein 1 pathway. By contrast, RBP4 induces endothelial inflammation via the NF‑κB/nicotinamide adenine dinucleotide phosphate oxidase pathway independently of retinol and STRA6, which stimulates expression of proinflammatory molecules, such as vascular cell adhesion molecule 1, E‑selectin, intercellular adhesion molecule 1, monocyte chemoattractant protein 1 and TNFα. RBP4 promotes oxidative stress by decreasing endothelial mitochondrial function; overall, it may serve as a useful biomarker in the diagnosis of obesity and prognosis of associated disease, as well as a potential therapeutic target for treatment of these diseases. |
