4.7 Article

Activin A increases human trophoblast invasion by upregulating integrin β1 through ALK4

Journal

FASEB JOURNAL
Volume 35, Issue 2, Pages -

Publisher

WILEY
DOI: 10.1096/fj.202001604R

Keywords

in vitro fertilization (IVF); ITGB1; predictive; diagnostic value; preeclampsia; pregnancy‐ induced hypertension

Funding

  1. Natural Science Fund of Jiangsu Province [SBK2020040489]
  2. Fundamental Research Funds of Shandong University [21520079614029]

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The study showed that integrin beta 1 mediates activin A-promoted trophoblast invasion through the ALK4-activated SMAD2/3-SMAD4 pathway. The predictive/diagnostic value of first-trimester maternal serum activin A for hypertensive disorders of pregnancy might be different in the IVF population.
Activin A promotes human trophoblast invasion during the first trimester of pregnancy and is associated with preeclampsia and pregnancy-induced hypertension (PE/PIH) in naturally conceived pregnancies. However, whether integrin beta 1 mediates activin A-increased trophoblast invasion remains unknown and the evidence is limited regarding the predictive value of activin A for PE/PIH in women receiving in vitro fertilization (IVF) treatment. Here, we studied the role and underlying molecular mechanisms of integrin beta 1 in activin A-promoted invasion in immortalized (HTR8/SVneo) and primary human extravillous trophoblast (EVT) cells. A nest case-control study was designed to investigate the predictive/diagnostic value of activin A in IVF pregnancies. Results showed that integrin beta 1 expression increased after activin A treatment and knockdown of integrin beta 1 significantly decreased both basal and activin A-increased HTR8/SVneo cell invasion. SB431542 (TGF-beta type I receptors inhibitor) abolished activin A-induced SMAD2/SMAD3 phosphorylation and integrin beta 1 overexpression. Activin A-upregulated integrin beta 1 expression was attenuated after the depletion of ALK4 or SMAD4 in both HTR8/SVneo and primary EVT cells. Furthermore, we found similar first-trimester activin A levels in IVF patients with or without subsequent PE/PIH. These results reveal that integrin beta 1 mediates activin A-promoted trophoblast invasion through ALK4-activated SMAD2/3-SMAD4 pathway, and the predictive/diagnostic value of first-trimester maternal serum activin A for hypertensive disorders of pregnancy might be different in IVF population.

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