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Diverse coactivator recruitment through differential PPARγ nuclear receptor agonism

Fernando Lizcano1, Diana Vargas

  • 1Biomedical Research Center, Universidad de La Sabana, Chía, Colombia.

Genetics and Molecular Biology
|April 10, 2013
PubMed

Insights

Telmisartan partially modulates PPARγ activity differently than rosiglitazone, with cofactors SRC1 and GRIP1 mediating these effects. This finding offers insights for developing new metabolic disease therapies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear receptor regulating lipid and carbohydrate metabolism, showing protective effects in type 2 diabetes.
  • Therapeutic use of PPARγ is limited by secondary effects of its ligands.
  • Ligand-induced conformational changes in PPARγ dictate downstream effects through cofactor binding.

Purpose of the Study:

  • To investigate the differential effects of various ligands on PPARγ cofactor binding.
  • To compare the effects of rosiglitazone (type 2 diabetes) and telmisartan (arterial hypertension) on PPARγ activity.
  • To identify cofactors mediating ligand-specific PPARγ modulation.

Main Methods:

  • Functional, phenotypic, and molecular studies were performed on pre-adipocyte 3T3-L1 cells.
  • Functional studies were conducted in U2OS cells.
  • Transient transfection assays were used to evaluate cofactor family influence on PPARγ.

Main Results:

  • Telmisartan demonstrated a partial modulating effect on PPARγ activity compared to rosiglitazone.
  • Cofactors Steroid Receptor Coactivator 1 (SRC1) and Glucocorticoid Receptor Interacting Protein 1 (GRIP1) were identified as mediators of telmisartan and rosiglitazone activity.
  • These cofactors partially explain the differential effects observed between the two ligands.

Conclusions:

  • Telmisartan exhibits partial agonism at PPARγ, distinct from the effects of rosiglitazone.
  • SRC1 and GRIP1 play a crucial role in mediating the differential activities of PPARγ ligands.
  • Understanding cofactor modulation of PPARγ offers potential for developing targeted therapies for metabolic diseases.
Keywords:
DNA binding proteins co-activatorgene expressiontelmisartantranscription

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