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  • Title: Is plasma 25(OH) D related to adipokines, inflammatory cytokines and insulin resistance in both a healthy and morbidly obese population?
    Author: Vilarrasa N, Vendrell J, Maravall J, Elío I, Solano E, San José P, García I, Virgili N, Soler J, Gómez JM.
    Journal: Endocrine; 2010 Oct; 38(2):235-42. PubMed ID: 21046484.
    Abstract:
    To analyse in a cohort of healthy subjects and in a group of morbidly obese patients, we studied the association amongst 25(OH) D and plasma concentrations of adipocytokines, inflammatory cytokines and insulin resistance. We also aimed to determine whether vitamin D-deficient patients showed a greater inflammatory profile. In the observational study that the authors conducted, plasma concentrations of 25(OH) D, leptin, resistin, adiponectin and interleukine-18 were determined in 134 healthy men and 127 women. In the population consisting of 44 patients with morbid obesity, plasma concentrations of 25(OH) D, leptin, resistin, adiponectin, interleukine-18, soluble tumor necrosis factor receptors 1 and 2 and C-reactive protein were analysed. In the healthy population, plasma 25(OH) D showed a negative correlation with body mass index, body fat, waist, hip circumference and with leptin. However, no significant associations were found amongst 25(OH) D and plasma concentrations of resistin, adiponectin or interleukine-18. Patients with vitamin D deficiency showed higher body mass index, fat mass percentage and higher leptin concentrations compared with subjects with normal 25(OH) D concentrations. In the morbidly obese subjects, 25(OH) D did not correlate with leptin, resistin, adiponectin, interleukine-18, soluble tumor necrosis factor receptors 1 and 2 or with C-reactive protein. In patients with morbid obesity, no differences were found in adipokines and inflammatory cytokines concentrations regarding 25(OH) D status. No associations were found either between 25(OH) D and plasma glucose and insulin resistance or with lipid profile. Plasma 25(OH) D concentrations are associated with adiposity markers but not with adipocytokines implicated in inflammation. This lack of association does not support a major role of 25(OH) D in the pro-inflammatory environment observed in morbidly obese subjects. In addition, subjects with vitamin D deficiency are not characterized by a greater inflammatory state.
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