Abstract
Ergosterol is an important compound responsible to maintain integrity and fluidity of Leishmania spp. membranes. Starting from an overexpression/selection method, our group has isolated and mapped nine different loci of Leishmania (L.) major related to resistance against two inhibitors of the ergosterol biosynthesis pathway, terbinafine (TBF) and itraconazole (ITZ). Individual functional analysis after overexpression induction of these loci in the presence of TBF and/or ITZ [or the ITZ analog ketoconazole (CTZ)] have shown low but significant levels of resistance after transfection into L. major wild-type parasites. In this work, we have shown the insert mapping and chromosomal identification of one of these loci (cosItz2). Functional analysis experiments associated with chromosomal localization by comparison at genomic database allowed us to identify two prospective gene–protein systems not related to the ergosterol biosynthesis and capable to confer wild-type cells resistance to ITZ–CTZ after transfection. We expected that this approach can open new insights for a better understanding of mechanisms of ITZ–CTZ action and resistance in Leishmania resulting in new strategies for the leishmaniasis treatment.
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Acknowledgements
This work was supported by FAPESP (00/10016-1, 02/09562-7, and 06/04656-4), CNPq (47121-2), LIM-48 (FM-USP) and by a fellowship from CNPq (P.C.C.). The chromosome blot was done at Stephen Beverley’s lab, whom we always thank.
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Camizotti, L.A., Yamashiro-Kanashiro, E.H. & Cotrim, P.C. Identification and chromosomal localization of one locus of Leishmania (L.) major related with resistance to itraconazole. Parasitol Res 105, 471–478 (2009). https://doi.org/10.1007/s00436-009-1418-9
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DOI: https://doi.org/10.1007/s00436-009-1418-9