Conjugation of Quinones with Natural Polyamines: Toward an Expanded Antitrypanosomatid Profile
摘要:
A combinatorial library of quinone-polyamine conjugates designed to optimize the antitrypanosomatid profile of hit compounds 1 and 2 has been prepared by a solid-phase approach. The conjugates were evaluated against the three most important human trypanosomatid pathogens (Trypanosoma brucei rhodesiense, Trypanosoma cruzi, and Leishmania donovani), and several showed promising activity. A subset also inhibited trypanothione reductase in vitro and induced oxidase activity of the enzyme. A highly potent analogue (7) was identified with activity against T. brucei as low as 70 nM and a selectivity index of 72. Interestingly, the presence of a cadaverine tail confers to 7 the ability to target mitochondrial function in Leishmania. In fact, in L. donovani promastigotes, we verified for 7 a decrease of cytoplasmic ATP and mitochondrial potential. Therefore, the current results support the suitability of the conjugation approach for the development of novel polyamine conjugates with enhanced therapeutic potential.
1,3-Dimethyllumazine Derivatives from <i>Limnatis </i><i>n</i><i>ilotica</i>
作者:Gerard Voerman、Silvia Cavalli、Gijsbert A. van der Marel、Wolfgang Pfleiderer、Jacques H. van Boom、Dmitri V. Filippov
DOI:10.1021/np049617a
日期:2005.6.1
Two previously unknown lumazine derivatives, 1 and 2, have been isolated from the parasitic freshwater leech Limnatis nilotica. The structures of the compounds have been elucidated by NMR and unambiguously corroborated by chemical synthesis.