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Circulating Retinol-Binding Protein-4, Insulin Sensitivity, Insulin Secretion, and Insulin Disposition Index in Obese and Nonobese Subjects

Response to Stefan et al.

¹ Diabetes, Endocrinology and Nutrition Unit, Dr. Josep Trueta Hospital, Girona, Spain
² CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03/010) Spain, Girona Institute for Biomedical Research, Girona, Spain
³ Reseach Unit, Pere Virgili Institute for Biomedical Research, Tarragona, Spain
⁴ Grupo CIBER (CB06/03/0003), Hospital Universitario Joan XXIII de Tarragona, Tarragona, Spain

Address correspondence to José Manuel Fernández-Real, MD, Unit of Diabetes, Endocrinology and Nutrition, Dr. Josep Trueta Hospital, Av. Francia s/n, 17007 Girona, Spain. E-mail: uden.jmfernandezreal@htrueta.scs.es

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We acknowledge the interest of Stefan et al. (1) in our findings in which they tried to replicate in their study of 75 men and women (mean BMI 29 kg/m²). Circulating retinol-binding protein (RBP)-4 did not correlate with insulin secretion even after adjustment for age, sex, and insulin sensitivity. We studied only men (n = 107). Marked sex differences in glucose-stimulated insulin secretion have been described in humans (2) and experimental models (3). Sex has been described to impact insulin secretion, insulin action, and hepatic insulin extraction, which results in substantial differences in the regulation of postprandial glucose metabolism in men . . . [Full Text of this Article]

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				J.-M. Fernandez-Real, J. Vendrell, W. Ricart, C. Richart, and M. Broch Circulating Retinol-Binding Protein-4, Insulin Sensitivity, Insulin Secretion, and Insulin Disposition Index in Obese and Nonobese Subjects: Response to Stefan et al. Diabetes Care, August 1, 2007; 30(8): e92 - e92. [Full Text] [PDF]