Evidence map›Paper›PMID 19926662›Full record

ReviewHuman reproduction update

Beyond oxygen: complex regulation and activity of hypoxia inducible factors in pregnancy.

K G Pringle, K L Kind, A N Sferruzzi-Perri, J G Thompson, C T Roberts

Abstract readReview
In one paragraph

Review in Human reproduction update. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 106 papers.

0numbers the graph read from it
0cells of the map it votes in
106citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

106 citing papers in PubMed.

  1. Trial
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  10. βMedicinal research reviews · 2025
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  18. Less is more! Low amount ofFrontiers in immunology · 2024
    Article
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46 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

K G PringleResearch Centre for Reproductive Health, Discipline of Obstetrics and Gynaecology, University of Adelaide, Adelaide, SA 5005, Australia.
K L Kind
A N Sferruzzi-Perri
J G Thompson
C T Roberts

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

In the first trimester the extravillous cytotrophoblast cells occlude the uterine spiral arterioles creating a low oxygen environment early in pregnancy, which is essential for pregnancy success. Paradoxically, shallow trophoblast invasion and defective vascular remodelling of the uterine spiral arteries in the first trimester may result in impaired placental perfusion and chronic placental ischemia and hypoxia later in gestation leading to adverse pregnancy outcomes. The hypoxia inducible factors (HIFs) are key mediators of the response to low oxygen. We aimed to elucidate mechanisms of regulation of HIFs and the role these may play in the control of placental differentiation, growth and function in both normal and pathological pregnancies. The Pubmed database was consulted for identification of the most relevant published articles. Search terms used were oxygen, placenta, trophoblast, pregnancy, HIF and hypoxia. The HIFs are able to function throughout all aspects of normal and abnormal placental differentiation, growth and function; during the first trimester (physiologically low oxygen), during mid-late gestation (where there is adequate supply of blood and oxygen to the placenta) and in pathological pregnancies complicated by placental hypoxia/ischemia. During normal pregnancy HIFs may respond to complex alterations in oxygen, hormones, cytokines and growth factors to regulate placental invasion, differentiation, transport and vascularization. In the ever-changing environment created during pregnancy, the HIFs appear to act as key mediators of placental development and function and thereby are likely to be important contributors to both normal and adverse pregnancy outcomes.

Indexed as

AnimalsBasic Helix-Loop-Helix ProteinsEndothelial PAS Domain-Containing Protein 1FemaleHumansHypoxiaHypoxia-Inducible Factor 1, alpha SubunitMiceOxygenPlacentaPlacentationPregnancyPregnancy Trimester, FirstPregnancy Trimester, ThirdRatsTrophoblastsBasic Helix-Loop-Helix ProteinsEndothelial PAS Domain-Containing Protein 1Hypoxia-Inducible Factor 1, alpha SubunitOxygen

Identifiers

PMID19926662
PMCPMC2880912

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.