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Do sphingoid bases interact with the peroxisome proliferator activated receptor alpha (PPAR-alpha)?
P P Van Veldhoven1, G P Mannaerts, P Declercq
1Departement Moleculaire Celbiologie Afdeling Farmakologie, Katholieke Universiteit Leuven, Campus Gasthuisberg, Herestraat, B-3000, Leuven, Belgium. Vanveldhoven@med.kuleuven.ac.be
Cellular Signalling
|September 16, 2000
Summary
Researchers identified new binding partners for peroxisome proliferator-activated receptor alpha (PPAR-alpha). The study found PPAR-alpha binds to unsaturated fatty acids and positively charged lipids like sphingoid bases.
Area of Science:
- Biochemistry
- Molecular Biology
- Lipid Metabolism
Background:
- Peroxisome proliferator-activated receptors (PPARs) are nuclear receptors regulating various cellular processes.
- Identifying endogenous ligands for PPARs is crucial for understanding their biological functions.
- PPAR-alpha plays a significant role in lipid metabolism and inflammation.
Purpose of the Study:
- To identify endogenous ligands that bind to mouse PPAR-alpha.
- To characterize the chemical properties of lipids that interact with PPAR-alpha.
Main Methods:
- Development of a solid-phase binding assay using recombinant, in vitro-labeled mouse PPAR-alpha.
- Immobilization of natural and synthetic lipids on silica layers for binding evaluation.
- Analysis of binding patterns using autoradiography.
Main Results:
- PPAR-alpha exhibited binding to two main classes of lipophilic compounds.
- The first class included (poly)unsaturated fatty acids.
- The second class comprised positively charged lipids, including long-chain amines, sphingoid bases (sphingenine), and lysoglycosphingolipids (psychosine).
- PPAR-alpha did not bind to ceramides or sphingosine-1-phosphate.
Conclusions:
- The study identified novel lipid-binding partners for PPAR-alpha.
- The findings suggest that PPAR-alpha can bind to both unsaturated fatty acids and certain positively charged lipids.
- The interaction of PPAR-alpha with sphingoid bases warrants further investigation due to the established roles of both molecules in cellular processes.