Browsing by Author "Robledo, Sara María"
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Item The Akt-like kinase of Leishmania panamensis: As a new molecular target for drug discovery(Elsevier B.V., 2018-01-01) Tirado-Duarte, Didier; Marín-Villa, Marcel; Ochoa, Rodrigo; Blandón-Fuentes, Gustavo; Soares, Maurílio José; Robledo, Sara María; Varela-M, R. E.The Akt-like kinase of Leishmania spp. is a cytoplasmic orthologous protein of the serine/threonine kinase B-PKB/human-Akt group, which is involved in the cellular survival of these parasites. By the application of a computational strategy we obtained two specific inhibitors of the Akt-like protein of L. panamensis (UBMC1 and UBMC4), which are predicted to bind specifically to the pleckstrin domain (PH) of the enzyme. We show that the Akt-like of Leishmania panamensis is phospho-activated in parasites under nutritional and thermic stress, this phosphorylation is blocked by the UBMC1 and UMBC2 and such inhibition leads to cell death. Amongst the effects caused by the inhibitors on the parasites we found high percentage of hypodiploidy and loss of mitochondrial membrane potential. Ultrastructural studies showed highly vacuolated cytoplasm, as well as shortening of the flagellum, loss of nuclear membrane integrity and DNA fragmentation. Altogether the presented results suggest that the cell death caused by UMBC1 and UMBC4 may be associated to an apoptosis-like process. The compounds present an inhibitory concentration (IC50) over intracellular amastigotes of L. panamensis of 9.2 ± 0.8 μM for UBMC1 and 4.6 ± 1.9 μM for UBMC4. The cytotoxic activity for UBMC1 and UBMC4 in human macrophages derived from monocytes (huMDM) was 29 ± 1.2 μM and >40 μM respectively. Our findings strongly support that the presented compounds can be plausible candidates as a new therapeutic alternative for the inhibition of specific kinases of the parasite. © 2017 The AuthorsItem Search of allosteric inhibitors and associated proteins of an AKT-like kinase from trypanosoma cruzi(MDPI AG, 2018-12-12) Ochoa, Rodrigo; Rocha-Roa, Cristian; Marín-Villa, Marcel; Robledo, Sara María; Varela-M, R. E.Proteins associated to the PI3K/AKT/mTOR signaling pathway are widely used targets for cancer treatment, and in recent years they have also been evaluated as putative targets in trypanosomatids parasites, such as Trypanosoma cruzi. Here, we performed a virtual screening approach to find candidates that can bind regions on or near the Pleckstrin homology domain of an AKT-like protein in T. cruzi. The compounds were also evaluated in vitro. The in silico and experimental results allowed us to identify a set of compounds that can potentially alter the intracellular signaling pathway through the AKT-like kinase of the parasite; among them, a derivative of the pyrazolopyridine nucleus with an IC 50 of 14.25 ± 1.00 µM against amastigotes of T. cruzi. In addition, we built a protein–protein interaction network of T. cruzi to understand the role of the AKT-like protein in the parasite, and look for additional proteins that can be postulated as possible novel molecular targets for the rational design of compounds against T. cruzi. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.