A common variant of the pregnancy-associated plasma protein-A (PAPPA) gene encodes a protein with reduced proteolytic activity towards IGF-binding proteins

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  • Jane Alro Botkjaer, Univ Copenhagen, Rigshospitalet, University of Copenhagen, Copenhagen Univ Hosp, Juliane Marie Ctr Women Children & Reprod, Lab Reprod Biol,Rigshosp
  • ,
  • Pernille Rimmer Noer
  • Claus Oxvig
  • Claus Yding Andersen, Univ Copenhagen, Rigshospitalet, University of Copenhagen, Copenhagen Univ Hosp, Juliane Marie Ctr Women Children & Reprod, Lab Reprod Biol,Rigshosp

Pregnancy-associated plasma protein-A (PAPP-A) is a key regulator of insulin-like growth factor (IGF) bioactivity, by releasing the IGFs from their corresponding IGF-binding proteins (IGFBPs). The minor allele of the single nucleotide polymorphism (SNP), rs7020782 (serine <tyrosine), in PAPPA has previously been associated with recurrent pregnancy loss as well as with significant reduced levels of PAPP-A protein in human ovarian follicles. The aim of the present study was to reveal a possible functional effect of the rs7020782 SNP in PAPPA by comparing recombinant PAPP-A proteins from transfected human embryonic kidney 293T cells. The proteolytic cleavage of IGFBP-4 was shown to be affected by the rs7020782 SNP in PAPPA, showing a significantly reduced cleavage rate for the serine variant compared to the tyrosine variant (p-value <0.001). The serine variant also showed a trend towards reduced cleavage rates, that was not significant, towards IGFBP-2 and IGFBP-5 compared to the tyrosine variant. No differences were found when analysing cell surface binding, complex formation between PAPP-A and STC2 or proMBP, nor when analysing STC1 inhibition of PAPP-A-mediated IGFBP-4 cleavage. Regulation of IGF bioactivity in reproductive tissues is important and the rs7020782 SNP in PAPPA may disturb this regulation by altering the specific activity of PAPP-A.

OriginalsprogEngelsk
Artikelnummer13231
TidsskriftScientific Reports
Vol/bind9
Antal sider9
ISSN2045-2322
DOI
StatusUdgivet - 2019

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