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The cytotoxicity of naphthazarin derivatives isolated from the roots of Onosma arenaria on human cervix adenocarcinoma cells (HeLa) and leukaemia K562 cells, as well on non-malignant peripheral blood mononuclear cells (PBMC) was studied. The results show that beta-hydroxyisovalerylalkannin, acetylalkannin and the pigment fraction exhibited high cytotoxicity in vitro against the tested cell lines, as well the healthy PBMC before or after activation with phytohaemagglutinin.
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Kundaković et al. (2006) studied this question.
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