Journal article
Glycosylated Siglec-6 expression in syncytiotrophoblast-derived extracellular vesicles from preeclampsia placentas
- Abstract:
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INTRODUCTION: Preeclampsia (PE) is associated with an exaggerated maternal systemic inflammatory response. Throughout gestation, the placenta releases extracellular vesicles through the syncytiotrophoblast layer (STB) into the maternal circulation and this is increased in PE. Expression of Siglec-6, a transmembrane receptor of molecular weight 50 KDa, is upregulated in PE placental tissue.
METHODS: Here we investigated respective abundance of Siglec-6 in PE -and normal pregnancy- (NP) derived placental lysates (PL) and syncytiotrophoblast-derived extracellular vesicles (STBEV). STBEV from PE and NP placentas were isolated through dual-lobe placental perfusion and serial ultracentrifugation. Siglec-6 was characterized by immunohistochemistry, immunoblotting, mass spectrometry (MS), and deglycosylation.
RESULTS: Immunoblotting revealed the expected Siglec-6 (50 KDa) band present in both PE and NP PL, however an additional heavier band was observed at 70 KDa only in PE PL, but not in NP. When interrogating STBEV we saw an absence of the expected 50 KDa band but the 70 KDa was present predominantly only in the PE STBEV. Deglycosylation of PL and STBEV from PE showed that the 70 KDa and the 50 KDa bands were reduced to 48 KDa, suggesting glycosylation. Both 48 KDa and 70 KDa bands were subjected to MS, confirming Siglec-6 expression in both.
DISCUSSION: Our data shows that the inability to detect Siglec-6 in circulation might be due to the placenta secreting STBEV carrying a modified glycosylated form of Siglec-6 with a 70 KDa molecular weight, significantly and uniquely upregulated in PE STBEV.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
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(Preview, Accepted manuscript, pdf, 189.9KB, Terms of use)
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- Publisher copy:
- 10.1016/j.bbrc.2020.09.081
Authors
- Publisher:
- Elsevier
- Journal:
- Biochemical and Biophysical Research Communications More from this journal
- Volume:
- 533
- Issue:
- 4
- Pages:
- 838-844
- Publication date:
- 2020-09-27
- Acceptance date:
- 2020-09-19
- DOI:
- EISSN:
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1090-2104
- ISSN:
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0006-291X
- Pmid:
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32998819
- Language:
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English
- Keywords:
- Pubs id:
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1136793
- Local pid:
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pubs:1136793
- Deposit date:
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2020-12-11
- ARK identifier:
Terms of use
- Copyright holder:
- Elsevier
- Copyright date:
- 2020
- Rights statement:
- © 2020 Published by Elsevier Inc.
- Notes:
- This is the accepted manuscript version of the article. The final version is available online from Elsevier at: https://doi.org/10.1016/j.bbrc.2020.09.081
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