Synthesis and cytotoxic activity of a new potential DNA bisintercalator: 1,4-Bis{3-[N-(4-chlorobenzo[g]phthalazin-1-yl)aminopropyl]}piperazine.
The synthesis of new 1,4-bisalkylamino (2-4) and 1-alkylamino-4-chloro (5-6) substituted benzo[g]phthalazines is reported. Compounds 2-4 and 6 were prepared both in the free and heteroaromatic ring protonated forms. Bifunctional 6 contains the 1,4-bisaminopropylpiperazine chain as a linker between the two heteroaromatic units, whereas 5 is its monofunctional analogue. The in vitro antitumour activity of the synthesized compounds has been tested against human colon, breast and lung carcinoma cells, and also against human glioblastoma cells. Results obtained show that all of them are active in all cases, but bifunctional 6.2HCl is remarkably effective against the four cell lines tested, exhibiting IC50 values in the range of 10(-7) M, similar to those found for doxorubicin. The bifunctional structure of 6.2HCl enhances activity with respect to the monofunctional related compounds 5 and 7, leading to the highest activity among all the compounds tested. Molecular modelling of 6 suggests that those results could be indicative of DNA bisintercalation, which should be specially favoured in the diprotonated form 6.2HCl, a compound suitable for being studied more in depth in further biological tests. Measure of the DNA thermal melting curves show that the linear rise in Tm for bifunctional 6.2HCl is nearly twice than that one obtained for monofunctional 5, and supports the DNA-binding hypothesis.
Instituto de Química Médica, Centro de Química Orgánica Manuel Lora-Tamayo, CSIC, c/Juan de la Cierva 3, E-28006 Madrid, Spain.
Juan
J
Galisteo
Pilar
P
Navarro
Lucrecia
L
Campayo
María J R
MJ
Yunta
Fernando
F
Gómez-Contreras
Janny A
JA
Villa-Pulgarin
Beatriz G
BG
Sierra
Faustino
F
Mollinedo
Jorge
J
Gonzalez
Enrique
E
Garcia-España
D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004247:DNA / Q000378:metabolism*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007364:Intercalating Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D008958:Models, Molecular; D009369:Neoplasms / Q000188:drug therapy; D009691:Nucleic Acid Denaturation / Q000187:drug effects; D010793:Phthalazines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000077489:Piperazine; D010879:Piperazines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*
D000970:Antineoplastic Agents; D007364:Intercalating Agents; D010793:Phthalazines; D010879:Piperazines; D000077489:Piperazine; D004247:DNA