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Discovery of antischistosomal drug leads based on tetraazamacrocyclic derivatives and their metal complexes

Khan, M. O. Faruk and Keiser, Jennifer and Amoyaw, P. N. A. and Hossain, Mohammad F. and Vargas, Mireille and Le, Justin G. and Simpson, Natalie C. and Roewe, Kimberly D. and Freeman, TaRynn N. Carder and Hasley, Travis R. and Maples, Randall D. and Archibald, Stephen J. and Hubin, Timothy J.. (2016) Discovery of antischistosomal drug leads based on tetraazamacrocyclic derivatives and their metal complexes. Antimicrobial agents and chemotherapy, 60 (9). pp. 5331-5336.

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Official URL: http://edoc.unibas.ch/44598/

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Abstract

Praziquantel (PZQ) is the only drug available for the treatment of schistosomiasis, and since its large-scale use might be associated with the onset of resistance, new antischistosomal drugs should be developed. A series of 26 synthetic tetraazamacrocyclic derivatives and their metal complexes were synthesized, characterized, and screened for antischistosomal activity by application of a phased screening program. The compounds were first screened against newly transformed schistosomula (NTS) of harvested Schistosoma mansoni cercariae, then against adult worms, and finally, in vivo using the mouse model of S. mansoni infection. At a concentration of 33 μM, incubation with a total of 12 compounds resulted in the mortality of NTS at the 62% to 100% level. Five of these showing 100% inhibition of viability of NTS at 10 μM were selected for further screening for determination of the 50 inhibitory concentrations (IC50s) against both NTS and adult worms. Against NTS, all 5 compounds showed IC50s comparable to the IC50 of the standard drug, PZQ (0.87 to 9.65 μM for the 5 compounds versus 2.20 μM for PZQ). Three of these, which are the bisquinoline derivative of cyclen and its Fe(2+) and Mn(2+) complexes, showed micromolar IC50s (1.62 μM, 1.34 μM, and 4.12 μM, respectively, versus 0.10 μM for PZQ) against adult worms. In vivo, the worm burden reductions were 12.3%, 88.4%, and 74.5%, respectively, at a single oral dose of 400 mg/kg of body weight. The Fe(2+) complex exhibited activity in vivo comparable to that of PZQ, pointing to the discovery of a novel drug lead for schistosomiasis.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH)
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Medical Parasitology and Infection Biology > Helminth Drug Development (Keiser)
UniBasel Contributors:Keiser, Jennifer and Vargas, Mireille
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Society for Microbiology
ISSN:0066-4804
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:08 Dec 2016 15:10
Deposited On:08 Dec 2016 15:10

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