Acute temporal regulation of placental vascular endothelial growth/permeability factor expression in baboons by estrogen

Biol Reprod. 2004 Nov;71(5):1694-8. doi: 10.1095/biolreprod.104.030882. Epub 2004 Jul 21.


Vascular endothelial growth/permeability factor (VEG/PF) has an established role in angiogenesis, however, the regulation of placental VEG/PF expression during primate pregnancy is incompletely understood. A temporal study was conducted in baboons to determine the effect of acute administration of estradiol on the expression of VEG/PF by cells of the villous placenta. VEG/PF mRNA levels were determined by reverse transcription-polymerase chain reaction in isolated placental cell fractions of baboons after acute i.v. and i.m. administration of estradiol. Within 2 h of estradiol treatment, VEG/PF mRNA (attomoles/ micrograms total RNA) increased within villous cytotrophoblasts to a level (mean +/- SEM, 12,612 +/- 2419) that was almost 2-fold greater (P < 0.05) than in untreated controls (6810 +/- 1368). Cytotrophoblast VEG/PF mRNA levels remained elevated (P < 0.01) 6 h after estradiol treatment (15,006 +/- 506), but were not different from controls 18 h after estradiol administration. VEG/ PF mRNA levels in whole villous tissue also were greater 6 h (12,667 +/- 2284, P < 0.05) and 18 h (16,080 +/- 3816, P < 0.01) after estradiol treatment than in untreated animals (3380 +/- 594). In contrast, VEG/PF mRNA levels in cells of the inner villous core were not altered by estradiol treatment. Expression of both the VEG/PF(121) and VEG/PF(165) mRNA species appeared to increase in the placenta 6 h after estradiol treatment of baboons. We propose that estrogen regulates VEG/PF expression within the placenta in a cell-specific manner, providing a paracrine system to promote vascularization of the villous placenta during the first half of primate pregnancy.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Estradiol / administration & dosage
  • Estradiol / blood
  • Estradiol / pharmacology*
  • Female
  • Injections, Intramuscular
  • Injections, Intravenous
  • Papio
  • Placenta / drug effects*
  • Placenta / metabolism*
  • Pregnancy
  • RNA, Messenger / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Time Factors
  • Trophoblasts / metabolism
  • Vascular Endothelial Growth Factor A / genetics
  • Vascular Endothelial Growth Factor A / metabolism*


  • RNA, Messenger
  • VEGFA protein, human
  • Vascular Endothelial Growth Factor A
  • Estradiol