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Substituted xanthones as selective and reversible monoamine oxidase A (MAO-A) inhibitors.

1,3-Dihydroxy-2-methylxanthone (X1), its 4-chloro and 4-bromo derivatives (X1-Cl and X1-Br), and 1,3-dihydroxy-4-methylxanthone were investigated for their inhibition activities toward MAO. A hyperbolic function was derived to fit the data and to calculate IC50 values. The compounds proved to be reversible and selective inhibitors of MAO-A, with X1 displaying the highest activity (IC50 = 3.7 microM).

Animals↗

IB-00208, a new cytotoxic polycyclic xanthone produced by a marine-derived Actinomadura. I. Isolation of the strain, taxonomy and biological activites.

A new compound, IB-00208, has been isolated from the fermentation broth of an actinomycete isolated from a marine environment. The strain was identified as Actinomadura sp. by its chemical and phylogenetic characteristics. The compound shows cytotoxic activity on tumor cell lines and bactericidal activity against gram-positive bacteria.

Actinomycetales↗