Evidence map›Paper›PMID 34992598›Full record

Observational studyFrontiers in immunology2021

The Placental Innate Immune System Is Altered in Early-Onset Preeclampsia, but Not in Late-Onset Preeclampsia.

Michelle Broekhuizen, Emilie Hitzerd, Thierry P P van den Bosch, Jasper Dumas, Robert M Verdijk, Bas B van Rijn, A H Jan Danser, Casper H J van Eijck, Irwin K M Reiss, Dana A M Mustafa

Abstract readObservational Study
In one paragraph

Observational study in Frontiers in immunology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.

0numbers the graph read from it
0cells of the map it votes in
32citing 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

32 citing papers in PubMed.

  1. Review
  2. Review
  3. Endothelial Dysfunction in Preeclampsia: Focus on the Uteroplacental Circulation.Arteriosclerosis, thrombosis, and vascular biology · 2026
    Review
  4. Article
  5. Article
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  9. Review
  10. Review
  11. Article
  12. Article
  13. Current Evidence of Maternal Infection With Chlamydia trachomatis and Preeclampsia Risk.American journal of reproductive immunology (New York, N.Y. : 1989) · 2025
    Review
  14. Article
  15. Article
  16. Article
  17. Article
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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

10 authors.

Michelle BroekhuizenDivision of Neonatology, Department of Pediatrics, Erasmus University Medical Center, Rotterdam, Netherlands.
Emilie HitzerdDivision of Neonatology, Department of Pediatrics, Erasmus University Medical Center, Rotterdam, Netherlands.
Thierry P P van den BoschDepartment of Pathology, Erasmus University Medical Center, Rotterdam, Netherlands.
Jasper DumasDepartment of Pathology, Erasmus University Medical Center, Rotterdam, Netherlands.
Robert M VerdijkDepartment of Pathology, Erasmus University Medical Center, Rotterdam, Netherlands.
Bas B van RijnDepartment of Obstetrics and Gynecology, Erasmus University Medical Center, Rotterdam, Netherlands.
A H Jan DanserDivision of Pharmacology and Vascular Medicine, Department of Internal Medicine, Erasmus University Medical Center, Rotterdam, Netherlands.
Casper H J van EijckDepartment of Surgery, Erasmus University Medical Center, Rotterdam, Netherlands.
Irwin K M ReissDivision of Neonatology, Department of Pediatrics, Erasmus University Medical Center, Rotterdam, Netherlands.
Dana A M MustafaDepartment of Pathology, Erasmus University Medical Center, Rotterdam, Netherlands.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Preeclampsia is a severe placenta-related pregnancy disorder that is generally divided into two subtypes named early-onset preeclampsia (onset <34 weeks of gestation), and late-onset preeclampsia (onset ≥34 weeks of gestation), with distinct pathophysiological origins. Both forms of preeclampsia have been associated with maternal systemic inflammation. However, alterations in the placental immune system have been less well characterized. Here, we studied immunological alterations in early- and late-onset preeclampsia placentas using a targeted expression profile approach. RNA was extracted from snap-frozen placenta samples (healthy n=13, early-onset preeclampsia n=13, and late-onset preeclampsia n=6). The expression of 730 immune-related genes from the Pan Cancer Immune Profiling Panel was measured, and the data were analyzed in the advanced analysis module of nSolver software (NanoString Technology). The results showed that early-onset preeclampsia placentas displayed reduced expression of complement, and toll-like receptor (TLR) associated genes, specifically TLR1 and TLR4. Mast cells and M2 macrophages were also decreased in early-onset preeclampsia compared to healthy placentas. The findings were confirmed by an immunohistochemistry approach using 20 healthy, 19 early-onset preeclampsia, and 10 late-onset preeclampsia placentas. We conclude that the placental innate immune system is altered in early-onset preeclampsia compared to uncomplicated pregnancies. The absence of these alterations in late-onset preeclampsia placentas indicates dissimilar immunological profiles. The study revealed distinct pathophysiological processes in early-onset and late-onset preeclampsia placentas and imply that a tailored treatment to each subtype is desirable.

Indexed as

AdultBiomarkersCase-Control StudiesFemaleGene Expression ProfilingHealthy VolunteersHumansMaternal AgePlacentaPre-EclampsiaPregnancySignal TransductionTime FactorsBiomarkerscomplementimmune systemmacrophagemast cellplacentapreeclampsiatoll like receptor

Identifiers

PMID34992598
PMCPMC8724430

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Registered trials

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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.