Hyaluronic acidamphotericin B nanocomplexes: a promising anti-leishmanial drug delivery system

Abstract

The development of an effective amphotericin B (AmB) formulation to replace actual treatments available for leishmaniasis, which present serious drawbacks, is a challenge. Here we report the development of hyaluronic acidamphotericin B self-assembled nanocomplexes (HAAmB), processed by freeze-drying (FD) or nano spray-drying (SD), using a simple process that favors the non-covalent drugpolysaccharide association in an amorphous state. These water-soluble formulations, which presented a nanometric size (300600 nm), high colloidal stability (zeta potential around 39 mV) and an AmB loading (1518%) in aggregated and super aggregated states, demonstrated less in vitro cytotoxic and hemolytic effects compared to the free-drug. A significant decrease in the number of intramacrophagic L. infantum amastigotes upon treatment (IC50 of 0.026 and 0.030 M for HAAmB FD and HAAmB SD, respectively) was also observed, and the best selectivity index (SI) was observed for the HAAmB SD nanocomplex (SI of 651). Intravenous administration of the HAAmB SD nanocomplex for 3 alternate days showed an effective parasite reduction in the spleen and liver of C57BL/6 mice without signs of toxicity commonly observed upon free-AmB treatment. Although lower than that achieved with AmBisome® in the liver, the observed parasite reduction for the nanocomplex was of a similar order of magnitude. The efficacy, stability, safety and low cost of the HAAmB SD nanocomplex highlight its potential as an alternative treatment for leishmaniasis.