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PPAR gamma is required for placental, cardiac, and adipose tissue development

Y Barak1, M C Nelson, E S Ong

  • 1Gene Expression Laboratory, The Salk Institute, La Jolla, California 92037, USA.

Molecular Cell
|November 5, 1999
PubMed

Insights

PPAR gamma deficiency causes lethal developmental defects in mice, impacting placental development and causing cardiac issues. Rescued mutants show lipodystrophy and hemorrhages, revealing new roles for PPAR gamma.

Area of Science:

  • Developmental biology
  • Molecular endocrinology
  • Genetics

Background:

  • Peroxisome proliferator-activated receptor gamma (PPAR gamma) is a nuclear hormone receptor crucial for adipogenesis and macrophage differentiation.
  • PPAR gamma is a key pharmacological target for managing type II diabetes.
  • The full spectrum of PPAR gamma's physiological roles in development remains incompletely understood.

Purpose of the Study:

  • To investigate the essential functions of PPAR gamma during embryonic development.
  • To characterize the lethal phenotypes associated with PPAR gamma gene knockout.
  • To identify novel roles of PPAR gamma in placental and cardiac development.

Main Methods:

  • Generation of PPAR gamma gene knockout mice.
  • Embryo aggregation with tetraploid wild-type embryos for rescue experiments.
  • Detailed phenotypic analysis of knockout embryos and rescued term survivors.

Main Results:

  • PPAR gamma deficiency leads to two distinct lethal phases during embryonic development.
  • Early lethality (by E10.0) is linked to impaired trophoblast differentiation and placental vascularization, causing myocardial thinning.
  • Tetraploid-rescued mutants surviving to term display lipodystrophy and multiple hemorrhages, indicating broader PPAR gamma functions.

Conclusions:

  • PPAR gamma is essential for normal placental development and embryonic survival.
  • The developing heart exhibits a previously unrecognized dependence on placental function, regulated by PPAR gamma.
  • These findings expand the known physiological functions of PPAR gamma beyond its established roles in metabolism and inflammation.

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