Absorption of Heme and Non-Heme Iron in Pregnant and Non-pregnant Women and Mechanisms of Fetal Iron Transfer
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 55
- 试验地点
- 2
- 主要终点
- Heme and Non-Heme Iron Absorption
研究概览
简要总结
The three specific aims of this study are 1) to assess the impact of iron status on relative differences in absorption of heme and non-heme iron among pregnant women and non-pregnant women, 2) to assess the magnitude and the determinants of heme and non-heme iron transfer to the fetus over the last trimester of pregnancy, and 3) to characterize relationships between placental iron binding proteins with the enrichment of stable iron isotopes in the neonate at birth. The investigators hypothesize that there will be up regulation of heme and non-heme iron absorption and up regulation of placental iron transport proteins in response to low maternal iron stores.
详细描述
To measure the absorption of heme and non-heme iron in women, pregnant and non-pregnant women will consume a standardized meal of pork (intrinsically labeled with 58Fe) and a second meal of non-heme 57Fe (as ferrous sulfate). Two weeks after ingesting these test meals, a blood sample will be collected from each women and the amount of heme (58Fe) and non-heme (57Fe) iron incorporated into red blood cells will be measured with magnetic sector thermal ionization mass spectrometry. Cord blood samples and placental tissue will be obtained at delivery to measure how these two forms of dietary iron were transferred across the placenta to the fetus. Maternal and neonatal iron status and placental proteins involved in iron transport will also be measured. Data from this study will provide information that aims to improve human health by better understanding the iron requirements of a population at high risk of iron deficiency.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Prospective
入排标准
- 年龄范围
- 15 Years 至 35 Years（Child, Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Pregnant subjects (15-35 yrs): non-smoking,healthy with uncomplicated pregnancies at time of enrollment
- •Non-pregnant subjects (18-35 yrs): healthy, non-smoking, not taking vitamin or mineral supplements and not planning on becoming pregnant during course of study.
排除标准
- •Pregnant subjects: gestational diabetes, hypertension, preeclampsia, underlying malabsorption diseases or other diagnosed medical problems known to impact iron homeostasis
- •Non-pregnant subjects: underlying malabsorption diseases or other diagnosed medical problems known to impact iron homeostasis.
结局指标
主要结局
Heme and Non-Heme Iron Absorption
时间窗: two-weeks post dosing (3rd trimester for pregnant subjects)
Heme and Non-Heme Transfer to Fetus
时间窗: Delivery
次要结局
- Iron Status (serum ferritin, TfR, Total Body Iron, Hb, Hepcidin), Folate, B-12, CRP and EPO in women and neonates(two weeks post dosing and at delivery for pregnant subjects)
- Protein expression of key iron transport proteins.(Delivery)