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Introduction Vitamin A is an essential nutrient consumed in the diet in the form of retinyl esters or beta carotene. Retinyl esters are transported by chylomicrons to the liver where they are converted to retinol and bound to retinol
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). Retinol-binding protein 4 (RBP4) is both an adipokine and liver-derived protein that transports retinol (vitamin A) in the blood ( Tamori et al . 2006 ). It has been implicated in the metabolic syndrome and adipose tissue inflammation ( Kovacs et al
Department of Internal Medicine IV, Division of Diabetology, Endocrinology and Nephrology, Eberhard-Karls University of Tübingen, Tübingen, Germany
Institute for Diabetes Research and Metabolic Diseases, Helmholtz Center Munich, Eberhard-Karls University of Tübingen, Tübingen, Germany
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Department of Internal Medicine IV, Division of Diabetology, Endocrinology and Nephrology, Eberhard-Karls University of Tübingen, Tübingen, Germany
Institute for Diabetes Research and Metabolic Diseases, Helmholtz Center Munich, Eberhard-Karls University of Tübingen, Tübingen, Germany
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. 2006 Retinol-binding protein 4 and insulin resistance in lean, obese, and diabetic subjects . New England Journal of Medicine 354 2552 – 2563 . ( https://doi.org/10.1056/NEJMoa054862 ) Groop LC Kankuri M Schalin-Jäntti C Ekstrand A Nikula
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Centre for Discovery Brain Science, University of Edinburgh, Hugh Robson Building, Edinburgh, UK
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& Walker BR 2012 Deletion of the androgen receptor in adipose tissue in male mice elevates retinol binding protein 4 and reveals independent effects on visceral fat mass and on glucose homeostasis . Diabetes 61 1072 – 1081 . ( https://doi.org/10.2337/db
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is downstream of retinoic acid signalling. Retinol enters the tanycytes where it is synthesised to retinoic acid (RA). RA enters the nucleus and binding to its receptors RAR and RXR leads to transcription of Rarres2 , which is translated into c
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ES Ross AW Wilson D Plé H Mercer JG Ebling FJ Schuhler S Dupré SM 2006 Photoperiodic regulation of cellular retinol binding protein, CRBP1 [corrected] and nestin in tanycytes of the third ventricle ependymal layer of the Siberian
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and a lipid core composed of TAGs, cholesterol ester and retinol ester ( Welte & Gould 2017 ) that are detected in adult islet β cells ( Vernier et al. 2012 , Trevino et al. 2015 , Dai et al. 2016 ). LD formation starts as TAG accumulation