TY - JOUR
T1 - Changes in plasma concentrations of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D during pregnancy
T2 - a Brazilian cohort
AU - Figueiredo, Amanda C.Cunha
AU - Cocate, Paula Guedes
AU - Adegboye, Amanda R.Amorim
AU - Franco-Sena, Ana Beatriz
AU - Farias, Dayana R.
AU - de Castro, Maria Beatriz Trindade
AU - Brito, Alex
AU - Allen, Lindsay H.
AU - Mokhtar, Rana R.
AU - Holick, Michael F.
AU - Kac, Gilberto
PY - 2018/3/28
Y1 - 2018/3/28
N2 - Purpose: To characterize the physiological changes in 25-hydroxyvitamin D [25(OH)D] and 1,25-dihydroxyvitamin D [1,25(OH)2D] throughout pregnancy. Methods: Prospective cohort of 229 apparently healthy pregnant women followed at 5th–13th, 20th–26th, and 30th–36th gestational weeks. 25(OH)D and 1,25(OH)2D concentrations were measured by LC–MS/MS. Statistical analyses included longitudinal linear mixed-effects models adjusted for parity, season, education, self-reported skin color, and pre-pregnancy BMI. Vitamin D status was defined based on 25(OH)D concentrations according to the Endocrine Society Practice Guideline and Institute of Medicine (IOM) for adults. Results: The prevalence of 25(OH)D <75 nmol/L was 70.4, 41.0, and 33.9%; the prevalence of 25(OH)D <50 nmol/L was 16.1, 11.2, and 10.2%; and the prevalence of 25(OH)D <30 nmol/L was 2, 0, and 0.6%, at the first, second, and third trimesters, respectively. Unadjusted analysis showed an increase in 25(OH)D (β = 0.869; 95% CI 0.723–1.014; P < 0.001) and 1,25(OH)2D (β = 3.878; 95% CI 3.136–4.620; P < 0.001) throughout pregnancy. Multiple adjusted analyses showed that women who started the study in winter (P < 0.001), spring (P < 0.001), or autumn (P = 0.028) presented a longitudinal increase in 25(OH)D concentrations, while women that started during summer did not. Increase of 1,25(OH)2D concentrations over time in women with insufficient vitamin D (50–75 nmol/L) at baseline was higher compared to women with sufficient vitamin D (≥75 nmol/L) (P = 0.006). Conclusions: The prevalence of vitamin D inadequacy varied significantly according to the adopted criteria. There was a seasonal variation of 25(OH)D during pregnancy. The women with insufficient vitamin D status present greater longitudinal increases in the concentrations of 1,25(OH)2D in comparison to women with sufficiency.
AB - Purpose: To characterize the physiological changes in 25-hydroxyvitamin D [25(OH)D] and 1,25-dihydroxyvitamin D [1,25(OH)2D] throughout pregnancy. Methods: Prospective cohort of 229 apparently healthy pregnant women followed at 5th–13th, 20th–26th, and 30th–36th gestational weeks. 25(OH)D and 1,25(OH)2D concentrations were measured by LC–MS/MS. Statistical analyses included longitudinal linear mixed-effects models adjusted for parity, season, education, self-reported skin color, and pre-pregnancy BMI. Vitamin D status was defined based on 25(OH)D concentrations according to the Endocrine Society Practice Guideline and Institute of Medicine (IOM) for adults. Results: The prevalence of 25(OH)D <75 nmol/L was 70.4, 41.0, and 33.9%; the prevalence of 25(OH)D <50 nmol/L was 16.1, 11.2, and 10.2%; and the prevalence of 25(OH)D <30 nmol/L was 2, 0, and 0.6%, at the first, second, and third trimesters, respectively. Unadjusted analysis showed an increase in 25(OH)D (β = 0.869; 95% CI 0.723–1.014; P < 0.001) and 1,25(OH)2D (β = 3.878; 95% CI 3.136–4.620; P < 0.001) throughout pregnancy. Multiple adjusted analyses showed that women who started the study in winter (P < 0.001), spring (P < 0.001), or autumn (P = 0.028) presented a longitudinal increase in 25(OH)D concentrations, while women that started during summer did not. Increase of 1,25(OH)2D concentrations over time in women with insufficient vitamin D (50–75 nmol/L) at baseline was higher compared to women with sufficient vitamin D (≥75 nmol/L) (P = 0.006). Conclusions: The prevalence of vitamin D inadequacy varied significantly according to the adopted criteria. There was a seasonal variation of 25(OH)D during pregnancy. The women with insufficient vitamin D status present greater longitudinal increases in the concentrations of 1,25(OH)2D in comparison to women with sufficiency.
KW - Cohort
KW - Micronutrients
KW - Pregnancy
KW - Seasons
KW - Tropical country
KW - Vitamin D
UR - http://www.scopus.com/inward/record.url?scp=85016095894&partnerID=8YFLogxK
U2 - 10.1007/s00394-017-1389-z
DO - 10.1007/s00394-017-1389-z
M3 - Article
C2 - 28353072
AN - SCOPUS:85016095894
SN - 1436-6207
VL - 57
SP - 1059
EP - 1072
JO - european journal of nutrition
JF - european journal of nutrition
ER -