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Cytotoxic palladium complexes of bioreductive quinoxaline N1,N4-dioxide prodrugs.

Abstract：

:Four new palladium(II) complexes with the formula Pd(L)(2), where L are quinoxaline-2-carbonitrile N(1),N(4)-dioxide derivatives, were synthesized as a contribution to the chemistry and pharmacology of metal compounds with this class of pharmacologically interesting bioreductive prodrugs. Compounds were characterized by elemental, conductometric and thermogravimetric analyses, fast atom bombardment mass spectrometry (FAB-MS) and electronic, Fourier transform infrared (FTIR) and (1)H-nuclear magnetic resonance spectroscopies. The complexes were subjected to cytotoxic evaluation on V79 cells in hypoxic and aerobic conditions. In addition, a preliminary study on interaction with plasmid DNA in normoxia was performed. Complexes showed different in vitro biological behavior depending on the nature of the substituent on the quinoxaline ring. Pd(L1)(2) and Pd(L2)(2), where L1 is 3-aminoquinoxaline-2-carbonitrile N(1),N(4)-dioxide and L2 is 3-amino-6(7)-methylquinoxaline-2-carbonitrile N(1),N(4)-dioxide, showed non selective cytotoxicity, being cytotoxic either in hypoxic or in aerobic conditions. On the other hand, Pd(L3)(2), where L3 is 3-amino-6(7)-chloroquinoxaline-2-carbonitrile N(1),N(4)-dioxide, resulted in vitro more potent cytotoxin in hypoxia (P=5.0 microM) than the corresponding free ligand (P=9.0 microM) and tirapazamine (P=30.0 microM), the first bioreductive cytotoxic drug introduced into clinical trials. In addition, it showed a very good selective cytotoxicity in hypoxic conditions, being non-cytotoxic in normoxia. Its hypoxic cytotoxicity relationship value, HCR, was of the same order than those of other hypoxia selective cytotoxins (i.e., Mitomycine C, Misonidazole and the N-oxide RB90740). Interaction of the complexes with plasmid DNA in normoxia showed dose dependent ability to relax the negative supercoiled forms via different mechanisms. Pd(L2)(2) introduced a scission event in supercoiled DNA yielding the circular relaxed form. Meanwhile, both Pd(L1)(2) and Pd(L3)(2) produced the loss of negative supercoils rendering a family of topoisomers with reduced electrophoretic mobility. Pd(L3)(2) showed a more marked effect than Pd(L1)(2). Indeed, for the highest doses assayed, Pd(L3)(2) was even able to introduce positive supercoils on the plasmid DNA.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Urquiola C,Vieites M,Torre MH,Cabrera M,Lavaggi ML,Cerecetto H,González M,Cerain AL,Monge A,Smircich P,Garat B,Gambino D

doi

10.1016/j.bmc.2008.12.064

subject

Has Abstract

pub_date

2009-02-15 00:00:00

pages

1623-9

issue

4

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(08)01239-X

journal_volume

17

pub_type

杂志文章

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