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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Crosstalk Between Bone and Fat Tissue: Associations Between Vitamin D, Osteocalcin, Adipokines, and Markers of Glucose Metabolism Among Adolescents

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Giudici, Kelly Virecoulon ; Fisberg, Regina Mara ; Lobo Marchioni, Dirce Maria ; Emo Peters, Barbara Santarosa ; Martini, Ligia Araujo
Total Authors: 5
Document type: Journal article
Source: JOURNAL OF THE AMERICAN COLLEGE OF NUTRITION; v. 36, n. 4, p. 273-280, 2017.
Web of Science Citations: 3

Objectives: This study aimed to investigate the relationship between 25-hydroxyvitamin D (25(OH)D), osteocalcin, markers of glucose metabolism, and obesity-related parameters among adolescents.Methods: This was a cross-sectional study with 198 adolescents age 14-18years. Weight, height, and waist and hip circumferences were measured, as well as the following biochemical parameters: serum 25(OH)D, parathyroid hormone (PTH), total (tOC) and undercarboxylated (ucOC) osteocalcin, adiponectin, leptin, glucose, and insulin. The homeostasis model of assessment estimate of insulin resistance (HOMA-IR) and -cell function (HOMA-) and quantitative insulin sensitivity check index (QUICKI) were calculated. Student's t test, analysis of variance (ANOVA), Pearson's correlation, and linear regression models were performed.Results: Overweight was observed in 42.6% of the sample. This group presented significantly higher PTH, leptin, insulin, HOMA-IR, and HOMA- and lower 25(OH)D, adiponectin, tOC, ucOC, and QUICKI than normal-weight subjects. 25(OH)D was positively correlated with ucOC and adiponectin and negatively associated with body mass index (BMI), weight, and waist circumference (p < 0.05 for all). The association between 25(OH)D and ucOC was also observed in the multiple regression analysis, adjusted for age, BMI, and season of the year (partial r(2) = 0.071, p < 0.0001). 25(OH)D and ucOC were not associated with markers of glucose metabolism. However, leptin was strongly correlated with insulin, HOMA-IR, HOMA-, and QUICKI (p < 0.0001 for all).Conclusion: The present study demonstrated that undercarboxylated osteocalcin is related to 25(OH)D and adiponectin concentrations. Both ucOC and 25(OH)D were lower in overweight and obese adolescents, reinforcing the importance of fighting obesity. Although a relationship of ucOC and 25(OH)D with markers of glucose metabolism was not observed, leptin has shown to be the hormone most related to energy homeostasis. (AU)

FAPESP's process: 12/11061-8 - Adipose tissue and bone: metabolic pathway between vitamin D, osteocalcin and adipokines in adolescents
Grantee:Lígia Araújo Martini
Support type: Regular Research Grants
FAPESP's process: 11/22768-2 - Relationship between fat mass and bone: metabolic interaction between vitamin D, vitamin D receptor genotype, osteocalcin and leptin in adolescentes
Grantee:Kelly Virecoulon Giudici
Support type: Scholarships in Brazil - Doctorate (Direct)