- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01019096
Absorption of Heme and Non-Heme Iron in Pregnant and Non-pregnant Women and Mechanisms of Fetal Iron Transfer
21. marts 2012 opdateret af: Cornell University
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.
Studieoversigt
Status
Afsluttet
Betingelser
Detaljeret beskrivelse
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.
Undersøgelsestype
Observationel
Tilmelding (Faktiske)
55
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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New York
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Rochester, New York, Forenede Stater, 14620
- Highland Hospital
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Rochester, New York, Forenede Stater, 14642
- Strong Memorial Hospital
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Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
15 år til 35 år (Barn, Voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Kvinde
Prøveudtagningsmetode
Ikke-sandsynlighedsprøve
Studiebefolkning
Pregnant women and adolescents from Rochester, NY and non-pregnant women from Ithaca, NY.
Beskrivelse
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.
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Tidsramme |
---|---|
Heme and Non-Heme Iron Absorption
Tidsramme: two-weeks post dosing (3rd trimester for pregnant subjects)
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two-weeks post dosing (3rd trimester for pregnant subjects)
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Heme and Non-Heme Transfer to Fetus
Tidsramme: Delivery
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Delivery
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Sekundære resultatmål
Resultatmål |
Tidsramme |
---|---|
Iron Status (serum ferritin, TfR, Total Body Iron, Hb, Hepcidin), Folate, B-12, CRP and EPO in women and neonates
Tidsramme: two weeks post dosing and at delivery for pregnant subjects
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two weeks post dosing and at delivery for pregnant subjects
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Protein expression of key iron transport proteins.
Tidsramme: Delivery
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Delivery
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Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Sponsor
Samarbejdspartnere
Efterforskere
- Ledende efterforsker: Kimberly O O'Brien, PhD, Cornell University
Publikationer og nyttige links
Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.
Generelle publikationer
- Delaney KM, Guillet R, Pressman EK, Caulfield LE, Zavaleta N, Abrams SA, O'Brien KO. Iron absorption during pregnancy is underestimated when iron utilization by the placenta and fetus is ignored. Am J Clin Nutr. 2020 Sep 1;112(3):576-585. doi: 10.1093/ajcn/nqaa155.
- Young MF, Griffin I, Pressman E, McIntyre AW, Cooper E, McNanley T, Harris ZL, Westerman M, O'Brien KO. Maternal hepcidin is associated with placental transfer of iron derived from dietary heme and nonheme sources. J Nutr. 2012 Jan;142(1):33-9. doi: 10.3945/jn.111.145961. Epub 2011 Nov 23.
- Young MF, Griffin I, Pressman E, McIntyre AW, Cooper E, McNanley T, Harris ZL, Westerman M, O'Brien KO. Utilization of iron from an animal-based iron source is greater than that of ferrous sulfate in pregnant and nonpregnant women. J Nutr. 2010 Dec;140(12):2162-6. doi: 10.3945/jn.110.127209. Epub 2010 Oct 27.
- Young MF, Pressman E, Foehr ML, McNanley T, Cooper E, Guillet R, Orlando M, McIntyre AW, Lafond J, O'Brien KO. Impact of maternal and neonatal iron status on placental transferrin receptor expression in pregnant adolescents. Placenta. 2010 Nov;31(11):1010-4. doi: 10.1016/j.placenta.2010.08.009. Epub 2010 Sep 15.
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. maj 2008
Primær færdiggørelse (Faktiske)
1. juli 2011
Studieafslutning (Faktiske)
1. juli 2011
Datoer for studieregistrering
Først indsendt
24. november 2009
Først indsendt, der opfyldte QC-kriterier
24. november 2009
Først opslået (Skøn)
25. november 2009
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
22. marts 2012
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
21. marts 2012
Sidst verificeret
1. marts 2012
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 06-06-045
- 2006-07-160 (Andet bevillings-/finansieringsnummer: HATCH, Cornell University)
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
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