Abstract
Aim
The aim of this study is to evaluate racial variation in umbilical cord blood concentration of vitamin D and to explore its correlation with markers of the insulin-like growth factor axis (IGFs) and sex steroid hormones in white and black male neonates.
Methods
In 2004–2005, venous umbilical cord blood samples were collected from 75 black and 38 white male neonates, along with maternal and birth characteristics from two hospitals in Maryland, United States. 25-Hydroxyvitamin D [25(OH)D] and 1,25-dihydroxyvitamin D [1,25(OH)2D] were measured by radioimmunoassay and testosterone, estradiol, and sex hormone-binding globulin (SHBG) by immunoassay and IGF-1, IGF-2, and IGF-binding protein-3 by ELISA. Crude and multivariable-adjusted geometric mean concentrations were computed.
Results
Mean 25(OH)D levels were lower in black than in white neonates (11.44; 95 % CI 10.10–12.95 ng/mL vs. 18.24; 95 % CI 15.32–21.72 ng/mL; p < 0.0001). Black neonates were at higher risk of suboptimal vitamin D levels [25(OH)D < 20 ng/mL] than whites (84 vs. 63 %). 25(OH)D concentrations varied by season in whites but not in blacks and were significantly inversely correlated with mother’s parity (number of live births) in blacks but not in whites. Mean concentration of 1,25(OH)2D did not differ by race. 25(OH)D and 1,25(OH)2D did not correlate with IGFs, sex steroid hormones, and SHBG.
Conclusions
Suboptimal vitamin D levels were prevalent especially in blacks and influenced by mother’s parity and by season. The observed vitamin D differences between black and white neonates warrant further evaluation of the etiology of the disparity in chronic diseases in adulthood.
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Acknowledgments
We thank Stacey Meyerer, laboratory manager, at the Johns Hopkins Bloomberg School of Public Health, for her assistance in the conduct of this study. The study has been supported by ISFE (Internationale Stiftung zur Förderung der Ernährungsforschung und Ernährungsaufklärung). This study was also supported by a National Cancer Institute U54 grant (Hopkins CA091409) and U54 (Howard CA091431). The content of this manuscript is solely the responsibility of the authors and does not necessarily represent the official views of the National Cancer Institute or the National Institutes of Health.
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Eichholzer, M., Platz, E.A., Bienstock, J.L. et al. Racial variation in vitamin D cord blood concentration in white and black male neonates. Cancer Causes Control 24, 91–98 (2013). https://doi.org/10.1007/s10552-012-0093-9
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DOI: https://doi.org/10.1007/s10552-012-0093-9