Activity of Ladanein on Leukemia Cell Lines and Its Occurrence in Marrubium vulgare

Abstract

Three methoxylated flavones isolated from Marrubium peregrinum – ladanein, scutellarein-5,7,4′-trimethyl ether, and scutellarein-5,6,7,4′-tetramethyl ether – were assayed for their cytotoxicity towards a recently developed dasatinib-resistant murine leukemia cell line (DA1-3b/M2^BCR‐ABL), together with the structurally related non-methylated flavone scutellarein. The most active compound, ladanein, was looked for in 20 common Lamiaceae species by a quick HPLC screening. Among the possible positive results, the most interesting source was found to be Marrubium vulgare, which led to the isolation and identification of ladanein for the first time in this species. Ladanein also displayed moderate (20–40 µM) activities against K562, K562R (imatinib-resistant), and 697 human leukemia cell lines but was toxic neither to MOLM13 nor to human peripheral blood mononuclear cells. This work provides a common natural source for the hemi-synthesis of future ladanein-derived flavones and the study of their antileukemic activity.

Marrubium - Lamiaceae - ladanein - leukemia - DA1‐3b/M2^BCR‐ABL - K562 - MOLM13–97

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