Synthetic prodigiosenes and the influence of C-ring substitution on DNA cleavage, transmembrane chloride transport and basicity.

Rastogi S, Marchal E, Uddin I, Groves B, Colpitts J, McFarland SA, Davis JT, Thompson A
Org Biomol Chem. 2013 11 (23): 3834-45

PMID: 23640568 · DOI:10.1039/c3ob40477c

Analogues of the tripyrrolic natural product prodigiosin bearing an additional methyl and a carbonyl group at the C-ring were synthesised and evaluated. In vitro anticancer activity screening (NCI) and the study of modes of action (copper-mediated cleavage of double-stranded DNA and transmembrane transport of chloride anions) showed that the presence of the methyl group is not detrimental to activity. Furthermore, although the presence of an ester conjugated to the prodigiosene C-ring seems to decrease both pK(a) and chloride transport efficiency compared to the natural product, these analogues still exhibit a high rate of chloride transport. All analogues exhibit good in vitro anticancer activity and reduced toxicity compared to the natural product: compare an acute systemic toxicity of 100 mg kg(-1) in mice vs. 4 mg kg(-1) for prodigiosin, pointing towards a larger therapeutic window than for the natural product.

MeSH Terms (14)

Animals Antineoplastic Agents Biological Transport Carbon Cell Line, Tumor Cell Membrane Chemistry Techniques, Synthetic Chlorides DNA Cleavage Humans Hydrogen-Ion Concentration Mice Prodigiosin Structure-Activity Relationship

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