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Expression and function of PPARgamma in rat placental development.
Reiko Asami-Miyagishi1, Sachiko Iseki, Mayumi Usui
1Department of Craniofacial Embryology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Biochemical and Biophysical Research Communications
|February 10, 2004
Summary
Peroxisome proliferator-activated receptor (PPAR) gamma is crucial for placental development and maternal-fetal transport. Enhancing PPAR gamma activity in pregnant rats improved placental function and reduced fetal mortality.
Area of Science:
- Reproductive biology
- Molecular endocrinology
- Developmental biology
Background:
- Peroxisome proliferator-activated receptor (PPAR) gamma is a nuclear receptor regulating adipogenesis.
- PPAR gamma gene deletion in mice causes embryonic lethality due to placental defects, indicating its role in trophoblast differentiation.
Purpose of the Study:
- To investigate the expression and localization of PPAR gamma in the rat placenta.
- To determine the role of PPAR gamma in placental development and maternal-fetal transport.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) to detect PPAR gamma mRNA.
- Immunohistochemistry to visualize PPAR gamma and its ligand.
- Administration of troglitazone (PPAR gamma agonist) to pregnant rats.
Main Results:
- PPAR gamma mRNA was detected in the rat placenta, with peak expression at day 13 of pregnancy.
- PPAR gamma and its ligand were localized in the trophoblast layer lining the maternal sinus.
- Troglitazone treatment increased placental PPAR gamma expression and halved fetal mortality.
Conclusions:
- PPAR gamma is essential for trophoblast differentiation and maturation.
- PPAR gamma plays a critical role in establishing functional maternal-fetal transport.
- Modulating PPAR gamma activity may offer therapeutic potential for placental insufficiency.