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meso -( p -acetamidophenyl)-calix[4]pyrrole  3  was found to exhibit remarkable cytotoxicity towards A549 cancer cells. A comparative study including the isomer of  3   meso -( m -acetamidophenyl)-calix[4]pyrrole  5 , as well as molecules containing ‘fragments’ of these structures, demonstrated that both the calix[4]pyrrole and the acetamidophenyl units are essential for high cytotoxicity. Although calix[4]pyrroles and other anion-complexing ionophores have recently been reported to induce apoptosis by perturbing cellular chloride concentrations, in our study an alternative mechanism has emerged, as proven by the isolation of covalent DNA adducts revealed by the  32 P postlabelling technique. Preliminary pharmacokinetic studies indicate that  3  is able to cross the Blood-Brain-Barrier, therefore being a potential drug that could kill primary and brain metastatic cancer cells simultaneously.

A novel calix[4]pyrrole derivative as a potential anticancer agent that forms genotoxic adducts with DNA