Evidence map›Paper›PMID 34207656›Full record

ArticleJournal of clinical medicine2021

Extracellular Vesicles: An Important Biomarker in Recurrent Pregnancy Loss?

Nina Rajaratnam, Nadja E Ditlevsen, Jenni K Sloth, Rikke Bæk, Malene M Jørgensen, Ole B Christiansen

Open access · goldAbstract read
In one paragraph

Article in Journal of clinical medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 1 pooled it
–field-weighted citation impact, top 99% of its field
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

20 citing papers in PubMed, 1 synthesis or guideline pooled it, 0 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. [The role of extracellular vesicles in early embryo development and their application in assisted reproductive technologies].Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences · 2025
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  15. HLA-G and Recurrent Pregnancy Loss.International journal of molecular sciences · 2023
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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

6 authors at 1 institution in 2 countries.

Nina RajaratnamDepartment of Obstetrics and Gynecology, Aalborg University Hospital, 9000 Aalborg, Denmark.
Nadja E DitlevsenDepartment of Obstetrics and Gynecology, Aalborg University Hospital, 9000 Aalborg, Denmark.
Jenni K SlothDepartment of Clinical Immunology, Aalborg University Hospital, 9000 Aalborg, Denmark.
Rikke BækDepartment of Clinical Immunology, Aalborg University Hospital, 9000 Aalborg, Denmark.ORCID 0000-0002-9045-9020
Malene M JørgensenDepartment of Clinical Immunology, Aalborg University Hospital, 9000 Aalborg, Denmark.ORCID 0000-0003-1381-3863
Ole B ChristiansenDepartment of Obstetrics and Gynecology, Aalborg University Hospital, 9000 Aalborg, Denmark.
Aalborg University Hospital · DK

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Recurrent pregnancy loss (RPL) has an estimated incidence of 1-3% of all couples. The etiology is considered to be multifactorial. Extracellular vesicles (EVs) take part in numerous different physiological processes and their contents show the originating cell and pathophysiological states in different diseases. In pregnancy disorders, changes can be seen in the composition, bioactivity and concentration of placental and non-placental EVs. RPL patients have an increased risk of pregnancy complications. The aim of this prospective study was to examine whether measuring different specific EV markers in plasma before and during pregnancy could be used as predictors of pregnancy loss (PL) in women with RPL. Thirty-one RPL patients were included in this study; 25 had a live birth (LB group) and six had a new PL (PL group). Five blood samples were obtained, one before achieved pregnancy and the others in gestational week 6, 8, 10 and 16. Moreover, some of the patients received intravenous immunoglobulin (IVIG) infusions as part of treatment, and it was also examined whether this treatment influenced the EV levels. Seventeen EV markers specific for the immune system, coagulation, placenta and hypoxia were analyzed in the samples with EV Array, a method able to capture small EVs by using an antibody panel targeting membrane proteins. Comparing the LB and PL groups, one EV marker, CD9, showed a significant increase from before pregnancy to gestational week 6 in the PL group. The changes in the other 16 markers were nonsignificant. One case of late-onset PL showed steeply increasing levels, with sudden decrease after gestational week 10 in nine of 17 markers. Moreover, there was an overall increase of all 17 markers after IVIG treatment in the LB group, which was significant in 15 of the markers. Whether increases in EVs positive for CD9 characterize RPL patients who subsequently miscarry should be investigated in future larger studies.

Indexed as

EV Arrayexosomesextracellular vesicleshabitual abortionmicrovesiclesrecurrent miscarriagerecurrent pregnancy loss

Identifiers

PMID34207656
PMCPMC8226857
OpenAlexW3128568457

What OpenQuestion holds

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LicenceCC BY
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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.