in vivo antileishmanial action of ir-(cod)-pentamidine tetraphenylborate on leishmania donovani and leishmania major mouse models
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2000
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Abstract
lr-(COD)-pentamidine tetraphenylborate which has previously been studied on promastigote forms of Leishmania, was investigated for its antileishmanial properties compared with pentamidine used as reference compound. In vitro, the iridium complex had the same IC50 value on intracellular forms of Leishmania as pentamidine (15 μM). In vivo, the compound could not be injected intravenously due to the DMSO excipient so that the treatments were performed intraperitoneally or subcutaneously. On the L. donovani LV9 /Balb/C mouse model, the iridium complex was not toxic after intraperitoneal treatment at 232 mg/kg/day x 5 or 147 μmoles/ kg/day x 5, whereas all the mice died within five days when treated at the same dose with pentamidine isethionate. However, only 23 % of parasite suppression was observed with the iridium complex. On a L. major MON 74/Balb/C mouse model, susceptible to intravenously administered pentamidine at 6.7 μmoles/ kg/day x 5 (54 % of parasite suppression), the iridium complex exhibited 32 % of parasite suppression after a treatment at 76 μmoles/ kg/day x 5 administered subcutaneously. This slight activity is of interest since pentamidine isethionate is not active under these conditions. Transmission electron microscopy of amastigotes from infected and treated mice show aggregation of ribosomal material, distension of the nuclear membrane and kDNA depolymerization. The mechanism of action therefore involves several targets: membranes, ribosomes and kDNA. According to our results, the Iridium complex is a suitable candidate to be encapsulated in drug carriers such as liposomes or nanoparticles.
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| Authors | ;Loiseau P.M.;Mbongo N.;Bories C.;Boulard Y.;Craciunescu D.G. |
| Journal | journal of nephropharmacology |
| Year | 2000 |
| DOI |
10.1051/parasite/2000072103
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