Synthesis and biological evaluation of 2-alkylaminoethyl-1,1-bisphosphonic acids against Trypanosoma cruzi and Toxoplasma gondii targeting farnesyl diphosphate synthase.
The effect of a series of 2-alkylaminoethyl-1,1-bisphosphonic acids against proliferation of the clinically more relevant form of Trypanosoma cruzi, the etiologic agent of American trypanosomiasis (Chagas' disease), and against tachyzoites of Toxoplasma gondii has been studied. Most of these drugs exhibited an extremely potent inhibitory action against the intracellular form of T. cruzi, exhibiting IC(50) values at the low micromolar level. This cellular activity was associated with a strong inhibition of the enzymatic activity of T. cruzi farnesyl diphosphate synthase (TcFPPS), which constitutes a valid target for Chagas' disease chemotherapy. Compound 17 was an effective agent against amastigotes exhibiting an IC(50) value of 0.84 microM, while this compound showed an IC(50) value of 0.49 microM against the target enzyme TcFPPS. Interestingly, compound 19 was very effective against both T. cruzi and T. gondii exhibiting IC(50) values of 4.1 microM and 2.6 microM, respectively. In this case, 19 inhibited at least two different enzymes of T. cruzi (TcFPPS and solanesyl diphosphate synthase (TcSPPS); 1.01 microM and 0.25 microM, respectively), while it inhibited TgFPPS in T. gondii. In general, this family of drugs was less effective against the activity of T. cruzi SPPS and against T. gondii growth in vitro. As bisphosphonate-containing compounds are FDA-approved drugs for the treatment of bone resorption disorders, their potential low toxicity makes them good candidates to control tropical diseases.
Szajnman
Sergio H
SH
Departamento de Química Orgánica and UMYMFOR (CONICET-FCEyN), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina.
García Liñares
Guadalupe E
GE
Li
Zhu-Hong
ZH
Jiang
Cuiying
C
Galizzi
Melina
M
Bontempi
Esteban J
EJ
Ferella
Marcela
M
Moreno
Silvia N J
SN
Docampo
Roberto
R
Rodriguez
Juan B
JB
D000818:Animals; D000981:Antiprotozoal Agents / Q000737:chemistry* / Q000494:pharmacology; D004164:Diphosphonates / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D004791:Enzyme Inhibitors; D051228:Geranyltranstransferase / Q000037:antagonists & inhibitors*; D020128:Inhibitory Concentration 50; D013329:Structure-Activity Relationship; D014122:Toxoplasma / Q000187:drug effects*; D014349:Trypanosoma cruzi / Q000187:drug effects*
D000981:Antiprotozoal Agents; D004164:Diphosphonates; D004791:Enzyme Inhibitors; D051228:Geranyltranstransferase