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Retinoid binding proteins-expression patterns in the human placenta.

S Johansson1, A L Gustafson, M Donovan

  • 1Department of Animal Development and Genetics, Norbyvägen 18A, Uppsala, S-752 36, Sweden.

Placenta
|July 27, 1999
PubMed
Summary
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This study investigated retinol-binding proteins in the human placenta. Maternal retinol-binding protein (RBP) likely transfers retinol to the fetus via a placental RBP-receptor, with cellular retinol-binding protein I (CRBP I) involved in binding and metabolism.

Area of Science:

  • Reproductive biology
  • Developmental biology
  • Molecular biology

Background:

  • Retinoids are crucial for embryonic development.
  • Retinol-binding proteins (RBPs) facilitate retinoid transport and metabolism.
  • Understanding RBP expression in the placenta is vital for fetal development.

Purpose of the Study:

  • To examine the expression and localization of RBPs in human first-trimester and term placentae.
  • To investigate the potential role of RBPs and their receptors in maternal-fetal retinol transfer.

Main Methods:

  • Immunohistochemistry to detect RBP and CRBP I.
  • Analysis of placental tissue from first-trimester and term pregnancies.
  • Identification of a putative RBP-receptor.

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Main Results:

  • Retinol-binding protein (RBP) mRNA was found in decidual cells.
  • Immunoreactive RBP (irRBP) was present in villous syncytiotrophoblast and mesenchymal cells, decreasing in term placentae.
  • A 60-65kDa RBP-receptor was detected in the syncytiotrophoblast.
  • Cellular retinol-binding protein I (CRBP I) was localized to villous stromal and decidual cells.

Conclusions:

  • Maternal RBP-retinol likely crosses the placenta via chorionic villi.
  • A placental RBP-receptor may mediate the absorption of retinol.
  • CRBP I-positive cells may bind, metabolize, and release retinol within the placenta.