spectinabilin and Prostatic-Neoplasms

In the course of screening for a new type of androgen receptor (AR) antagonist, we isolated a novel compound, arabilin, with two structural isomers, spectinabilin and SNF4435C, produced by Streptomyces sp. MK756-CF1. Structure elucidation on the basis of the spectroscopic properties showed that arabilin is a novel polypropionate-derived metabolite with a p-nitrophenyl group and a substituted γ-pyrone ring. Arabilin competitively blocked the binding of androgen to the ligand-binding domain of AR in vitro. In addition, arabilin inhibited androgen-induced prostate-specific antigen mRNA expression in prostate cancer LNCaP cells.

Topics: Androgen Antagonists; Binding, Competitive; Cell Line, Tumor; Gene Expression Regulation, Neoplastic; Humans; Male; Nitro Compounds; Prostate-Specific Antigen; Prostatic Neoplasms; Protein Binding; Pyrones; RNA, Messenger; Spectrum Analysis; Stereoisomerism; Streptomyces