Dafadine A is a selective inhibitor of C. elegans DAF-9 cytochrome P450, a key regulator of dauer formation, developmental timing and longevity. C. elegans has four life stages. In harsh environmental conditions, nematodes can convert to the L3 stage, known as the ""non-aging"" dauer stage, in which development ceases until improved conditions are sensed. Dafadine A can induce dauer formation and increased longevity in wild-type worms raised in nonstressful conditions. Dafadine A is the only inhibitor known to robustly inhibit DAF-9 in wild-type worms. It does not inhibit DAF-12 activity. Dafadine is active in mammalian systems, inhibiting CYP27A1, the mammalian functional ortholog of DAF-9 that oxidizes 4-cholesten-3-one to make 26-hydroxy-4-cholesten-3-one and Δ4-dafachronic acid, without inhibiting other sterol- and oxysterol-metabolizing P450s such as CYP7A1 or CYP7B1.
Dafadine A is a selective inhibitor of C. elegans DAF-9 cytochrome P450 and CYP7A1, the mammalian ortholog.
Here, we discovered an endogenous dafachronic acid (DA) in the socioeconomically important parasitic nematode Haemonchus contortus. We demonstrate that DA promotes larval exsheathment and development in this nematode via a relatively conserved nuclear hormone receptor (DAF-12). This stimulatory effect is
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