Syncytiotrophoblast Vesicles Show Altered Micro-RNA and Haemoglobin Content After Ex-vivo Perfusion of Placentas with Haemoglobin to Mimic Preeclampsia

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2014 Mar 4

PMID 24587192

Citations 19

Authors

Tina Cronqvist

Karen Salje

Mary Familari

Seth Guller

Henning Schneider

Chris Gardiner

Ian L Sargent

Christopher W Redman

Matthias Morgelin

Bo Akerstrom

Magnus Gram

Stefan R Hansson

Affiliations

Soon will be listed here.

Abstract

Background: Cell-free foetal haemoglobin (HbF) has been shown to play a role in the pathology of preeclampsia (PE). In the present study, we aimed to further characterize the harmful effects of extracellular free haemoglobin (Hb) on the placenta. In particular, we investigated whether cell-free Hb affects the release of placental syncytiotrophoblast vesicles (STBMs) and their micro-RNA content.

Methods: The dual ex-vivo perfusion system was used to perfuse isolated cotyledons from human placenta, with medium alone (control) or supplemented with cell-free Hb. Perfusion medium from the maternal side of the placenta was collected at the end of all perfusion phases. The STBMs were isolated using ultra-centrifugation, at 10,000×g and 150,000×g (referred to as 10K and 150K STBMs). The STBMs were characterized using the nanoparticle tracking analysis, identification of surface markers and transmission electron microscopy. RNA was extracted and nine different micro-RNAs, related to hypoxia, PE and Hb synthesis, were selected for analysis by quantitative PCR.

Results: All micro-RNAs investigated were present in the STBMs. Mir-517a, mir-141 and mir-517b were down regulated after Hb perfusion in the 10K STBMs. Furthermore, Hb was shown to be carried by the STBMs.

Conclusion: This study showed that Hb perfusion can alter the micro-RNA content of released STBMs. Of particular interest is the alteration of two placenta specific micro-RNAs; mir-517a and mir-517b. We have also seen that STBMs may function as carriers of Hb into the maternal circulation.

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