Serum 25-hydroxyvitamin D levels among Mexican children ages 2 y to 12 y: a national survey.

Objective: The aim of this study was to assess the vitamin D status in preschool and school-age children in Mexico.

Methods: 25-hydroxyvitamin D (25-OH-D) serum concentrations were measured using a direct enzyme-linked immunosorbent assay commercial kit in a nationally representative sample of 1025 Mexican children ages 2 y to 12 y who participated in the 2006 Mexican National Health and Nutrition Survey.

Results: Mean serum 25-OH-D concentration was 94.

Effect of age on insulin-induced endothelin release and vasoreactivity in hypertriglyceridemic and hypertensive rats.

In the present paper, the age-related changes in the vasoconstrictive endothelin-mediated response to insulin in aortas of normal and hypertensive, hypertriglyceridemic, hyperinsulinemic (HTG) rats were studied. To develop HTG rats, weanling male Wistar animals were given 30% sucrose in their drinking water for 4, 6, 12 and 18 months. Blood pressure was increased in HTG rats for up to 12 months showing a maximum at 6 months (138.

[Magnesium: physiological aspects and its implication in normal and preeclamptic pregnancies].

The present work provides information about magnesium (Mg) physiology, Mg supplementation during normal pregnancy, and the use of Magnesium Sulfate MgSO4 in preeclampsia and eclampsia. Intestinal absorption, renal excretion and cellular distribution of Mg are described. In addition, this review includes several functions in which Mg is involved such as bone structure, enzymatical activities, cellular signaling, ionic channel regulation and gene expression.

Placental insulin and insulin-like growth factor I receptors in normal and preeclamptic pregnancies.

Objectives: To assess the ligand binding characteristics of insulin and insulin-like growth factor I receptors in normal and preeclamptic placentas.

Design And Methods: This study was done cross sectionally in trophoblast membranes obtained from 10 normotensive and 9 preeclamptic pregnant women. The affinity and number of binding sites of insulin and insulin-like growth factor I receptors were assessed by binding assays and Scatchard plot analysis.

Newborn birth weight correlates with placental zinc, umbilical insulin-like growth factor I, and leptin levels in preeclampsia.

Background: The aim of the present study was to determine whether newborn birth weights were associated with insulin-like growth factor I (IGF-I), zinc, and leptin in preeclamptic and normotensive pregnancies.

Methods: This study was done cross-sectionally and included 15 women with moderate preeclampsia (PE group) and 11 normotensive pregnant women (NT group) of similar gestational age. Maternal and umbilical cord serum levels of zinc, IGF-I, IGF binding proteins (IGFBPs), leptin, and placental zinc were assessed in each group.