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Year: 2007 Volume: 23

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Red blood cell metallothionein as an indicator of zinc status during pregnancy.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Caulfield, Laura E. Donangelo, Carmen M. Chen, Ping Junco, Jorge Merialdi, Mario Zavaleta, Nelly
Description	Country affiliation: United States Author Affiliation: Caulfield LE ( Center for Human Nutrition, Johns Hopkins School of Public Health, Baltimore, Maryland, USA. lcaulfie@jhsph.edu)
Abstract	OBJECTIVE: We describe the levels and patterns of change in red blood cell (RBC) metallothionein (MT) during pregnancy and the neonate and relate RBCMT to other indicators of zinc and iron status. METHODS: As part of a double-masked controlled trial of prenatal zinc supplementation among 242 Peruvian pregnant women, we determined RBCMT at enrollment (10-16 wk), at 28 and 36 wk of gestation, and in the cord blood at delivery in 158 women (86 who received daily supplements containing 60 mg of iron and 250 microg of folic acid and 72 whose supplements also contained 25 mg of zinc). In addition, we measured plasma and urinary zinc concentrations, hemoglobin and serum ferritin, and, on a limited sample, RBC zinc and placental MT. RESULTS: RBCMT increased during pregnancy, and levels in the cord blood approximated maternal values at 36 wk. Only RBC zinc at 36 wk differed by supplement type (P < 0.05). Increases in RBCMT over pregnancy were, however, related to early pregnancy RBC zinc and inversely with the decline in plasma zinc from baseline to 36 wk of gestation. CONCLUSION: Changes in RBCMT throughout pregnancy were consistent with the hypothesized role of MT in regulating zinc homeostasis. RBCMT appears to not be responsive during pregnancy to changes in zinc status achieved with supplements.
File Format	HTM / HTML
ISSN	08999007
e-ISSN	18731244
DOI	10.1016/j.nut.2008.05.011
Journal	Nutrition
Issue Number	11-12
Volume Number	24
Language	English
Publisher	Elsevier
Publisher Date	2008-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Nutritional Sciences Erythrocytes Chemistry Administration & Dosage Blood Metallothionein Nutritional Status Zinc Biological Markers Dietary Supplements Double-blind Method Fetal Blood Gestational Age Infant, Newborn Maternal Nutritional Physiological Phenomena Drug Effects Physiology Parity Placenta Pregnancy Prenatal Nutritional Physiological Phenomena Randomized Controlled Trial Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Endocrinology, Diabetes and Metabolism

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