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Simultaneous, bidirectional inhibitory crosstalk between PPAR and STAT5b.

Jonathan M Shipley¹, David J Waxman

¹Division of Cell and Molecular Biology, Department of Biology, Boston University, MA 02215, USA.

Toxicology and Applied Pharmacology

|September 15, 2004

Summary

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Peroxisome proliferator-activated receptors (PPARs) and signal transducer and activator of transcription 5 (STAT5) mutually inhibit each other

Area of Science:

Molecular biology
Endocrinology
Toxicology

Background:

PPARs regulate fatty acid metabolism and adipogenesis.
STAT5 mediates hormonal responses crucial for growth and development.
PPAR and STAT5 pathways exhibit mutually inhibitory crosstalk.

Purpose of the Study:

To investigate the dominance and mechanism of inhibitory crosstalk between PPAR and STAT5.
To determine how relative factor levels and ligand concentrations influence this interaction.
To assess the impact of environmental chemicals on this crosstalk.

Main Methods:

Co-transfection assays using luciferase reporters for PPAR and STAT5 activity.
Stimulation with growth hormone (GH) and PPAR agonists.
Dose-response studies with PPAR ligands and phthalates.

Related Experiment Videos

Main Results:

STAT5 inhibited PPAR activity, and PPAR inhibited STAT5 activity bidirectionally.
Crosstalk extent depended on relative transcription factor levels and ligand concentrations.
Environmental chemicals like phthalates inhibited STAT5 at lower concentrations than required for PPAR activation.

Conclusions:

PPAR and STAT5 cross-inhibition is simultaneous and bidirectional.
Environmental PPAR activators can disrupt STAT5-mediated gene expression.
Hormonal signals can modulate PPAR responses to xenobiotics.