A metabolite of pregnenolone
17α-hydroxy Pregnenolone is a metabolite of pregnenolone and a precursor in the biosynthesis of dehydroepiandrosterone .[1] It is formed from pregnenolone by cytochrome P450 (CYP) isoform CYP17A1 hydroxylase activity and then converted to dehydroepiandrosterone by CYP17A1-mediated 17,20-lyase activity. Plasma levels of 17α-hydroxy pregnenolone are elevated in patients with type II 3β-hydroxysteroid dehydrogenase deficiency, a form of congenital adrenal hyperplasia.[2]
Reference:
[1]. Petrunak, E.M., DeVore, N.M., Porubsky, P.R., et al. Structures of human steroidogenic cytochrome P450 17A1 with substrates. J. Biol. Chem. 289(47), 32952-32964 (2014).
[2]. Fiet, J., Giton, F., Boudi, A., et al. Plasma 17-OH pregnenolone: Comparison of a time-resolved fluoroimmunoassay using a new tracer 17-OH pregnenolone-3-oxyacetyl-biotine with a radioimmunoassay using 125I 17-OH pregnenolone-3-hemisuccinate-histamine. Steroids 66(2), 81-86 (2001).
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