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Absorption of Heme and Non-Heme Iron in Pregnant and Non-pregnant Women and Mechanisms of Fetal Iron Transfer

This study has been completed.
University of Rochester
Information provided by (Responsible Party):
Cornell University Identifier:
First received: November 24, 2009
Last updated: March 21, 2012
Last verified: March 2012
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.

Iron Deficiency

Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Absorption of Heme and Non-Heme Iron in Pregnant and Non-pregnant Women and Mechanisms of Fetal Iron Transfer

Resource links provided by NLM:

Further study details as provided by Cornell University:

Primary Outcome Measures:
  • Heme and Non-Heme Iron Absorption [ Time Frame: two-weeks post dosing (3rd trimester for pregnant subjects) ]
  • Heme and Non-Heme Transfer to Fetus [ Time Frame: Delivery ]

Secondary Outcome Measures:
  • Iron Status (serum ferritin, TfR, Total Body Iron, Hb, Hepcidin), Folate, B-12, CRP and EPO in women and neonates [ Time Frame: two weeks post dosing and at delivery for pregnant subjects ]
  • Protein expression of key iron transport proteins. [ Time Frame: Delivery ]

Biospecimen Retention:   Samples With DNA
For non-pregnant subjects 15 mL of blood are collected. For pregnant subjects two 15 mL blood samples are collected. The placenta and up to 30 mL of cord blood are also collected at delivery.

Enrollment: 55
Study Start Date: May 2008
Study Completion Date: July 2011
Primary Completion Date: July 2011 (Final data collection date for primary outcome measure)
Detailed Description:
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.

Ages Eligible for Study:   15 Years to 35 Years   (Child, Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Pregnant women and adolescents from Rochester, NY and non-pregnant women from Ithaca, NY.

Inclusion Criteria:

  • 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.

Exclusion Criteria:

  • 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.
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Please refer to this study by its identifier: NCT01019096

United States, New York
Highland Hospital
Rochester, New York, United States, 14620
Strong Memorial Hospital
Rochester, New York, United States, 14642
Sponsors and Collaborators
Cornell University
University of Rochester
Principal Investigator: Kimberly O O'Brien, PhD Cornell University
Principal Investigator: Eva Pressman, MD University of Rochester
  More Information

Responsible Party: Cornell University Identifier: NCT01019096     History of Changes
Other Study ID Numbers: 06-06-045
2006-07-160 ( Other Grant/Funding Number: HATCH, Cornell University )
Study First Received: November 24, 2009
Last Updated: March 21, 2012

Keywords provided by Cornell University:
heme iron
non-heme iron
stable isotopes

Additional relevant MeSH terms:
Anemia, Iron-Deficiency
Anemia, Hypochromic
Hematologic Diseases
Iron Metabolism Disorders
Metabolic Diseases
Trace Elements
Growth Substances
Physiological Effects of Drugs processed this record on April 27, 2017