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• W2021494920 abstract "Promastigotes and amastigotes of Leishmania mexicana mexicana transported 2-deoxy-d-glucose (2-DOG) by a saturable process with a Km of 24 ± 3 μM and Vmax of 2.21 nmol min−1 (mg protein)−1 for the promastigote and a Km of 29 ± 8 μM and Vmax of 0.13 nmol min−1 (mg protein)−1 for the amastigote stage. Amastigotes incorporated 2-DOG maximally at pH 5.0, while for promastigotes the optimum was at pH 7.0. Mid-log phase promastigotes were found to accumulate 2-DOG via a stereospecific carrier-mediated process which was competitively inhibited by d-glucose and d-mannose but not l-glucose. Transport was dependent upon temperature, with a Q10 in promastigotes of 1.83 and an optimum rate at 35°C (±4°C) with an activation energy of 50.12 kJ mol−1. Stationary phase promastigotes accumulated 2-DOG at approximately twice the rate of mid-log phase promastigotes. Cytochalasin B, forskolin and phloretin were all found to inhibit human erythrocyte 2-DOG uptake but only cytochalasin B was found significantly to inhibit promastigote 2-DOG uptake. Interestingly, leishmanial 2-DOG uptake was inhibited by a series of membrane potential antagonists including the ionophore monensin, the H+ATPase inhibitor N,N′-dicyclohexylcarbodiimide (DCCD) and uncoupling agent carbonylcyanide-4-(triflouromethoxy) phenylhydrazone (FCCP), as well as, the tricyclic drugs chlomipramine and imipramine, but was insensitive to the Na+/K+ ATPase inhibitor ouabain and the antitrypanosomal drugs Pentostam and Suramin. We therefore conclude that there are significant structural and mechanistic differences between the d-glucose uptake systems of Leishmania and the mammalian host to merit the inclusion of glucose transporters as putative targets for rational drug design." @default.
• W2021494920 created "2016-06-24" @default.
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• W2021494920 date "1995-10-01" @default.
• W2021494920 modified "2023-10-16" @default.
• W2021494920 title "Glucose transport in amastigotes and promastigotes of Leishmania mexicana mexicana" @default.
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• W2021494920 doi "https://doi.org/10.1016/0166-6851(95)02485-9" @default.
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