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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Peroxisome proliferator-activated receptor delta is a specific sensor for teratogenic valproic acid derivatives.

The antiepileptic drug valproic acid (2-propylpentanoic acid) is a potent teratogen in both humans and mice. Valproic acid can induce differentiation of F9 teratocarcinoma cells and stimulate peroxisome proliferator-activated receptor ( PPAR) activity. In this study, the structure-activity relationship between valproic acid, its teratogenic and non-teratogenic analogues (branched small- and medium chain fatty acids) and the three PPAR subtypes alpha, gamma or delta was investigated. PPAR-alpha and PPAR-gamma were activated by some valproic acid-derivatives; however, no correlation between teratogenicity and receptor activation could be observed. In contrast, only valproic acid and exclusively its teratogenic analogues were able to activate PPAR-delta in different cellular systems. However, valproic acid appears not to be a direct ligand of PPAR-delta, since in contrast to carbaprostacyclin (cPGI), valproic acid showed not to be able to induce complex formation of PPAR-delta-retinoid X receptor (RXR) heterodimers on DNA. In conclusion, in contrast to PPAR-alpha and PPAR-gamma, PPAR-delta shows to be a specific sensor for teratogenic valproic acid-derivatives.[1]


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