| dc.creator | Uzcátegui, Néstor L. | |
| dc.creator | Figarella, Katherine | |
| dc.creator | Camacho, Natacha | |
| dc.creator | Ponte-Sucre, Alicia | |
| dc.date | 2012-08-23T23:49:27Z | |
| dc.date | 2012-08-23T23:49:27Z | |
| dc.date | 2012-08-23 | |
| dc.date.accessioned | 2022-10-28T00:50:28Z | |
| dc.date.available | 2022-10-28T00:50:28Z | |
| dc.identifier | 1532-0456 | |
| dc.identifier | http://hdl.handle.net/10872/1704 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4936319 | |
| dc.description | Several drug-resistant mammalian cell types exhibit increased glycolytic rates, preferential synthesis of ATP through oxidative
phosphorylation, and altered glucose transport. Herein we analyzed the influence of parasite growth phase on energy substrate uptake and use in a Leishmania strain [NR(Gr)] selected for resistance against glibenclamide. Glibenclamide is an ABC-transporter blocker which modulates
the function of glucose transporters in some mammalian cells. Our results demonstrate for the first time that compared to glibenclamide sensitive Leishmania, exponential phase glibenclamide-resistant parasites exhibit decreased use of glucose as energy substrate, decreased glucose uptake and decreased glucose transporter expression. However, compared to glibenclamide-sensitive cells, stationary phase resistant parasites display an increased use of amino acids as energy substrate and an increased activity of the enzymes hexokinase, phosphoglucose isomerase, and especially NAD+-linked glutamate dehydrogenase. These results suggest that drug resistance in Leishmania involves a metabolic adaptation that promotes a stage dependent modulation of energy substrate uptake and use as a physiological response to the challenge imposed by drug pressure. | |
| dc.description | Consejo de Desarrollo Cientifico y Humanistico UCV, Coordinacion de Investgiacion de la Facultad de Medicina, UCV | |
| dc.language | en_US | |
| dc.relation | Comparative Biochemistry and Physiology;140:395-402, 2005 | |
| dc.subject | Amino acid | |
| dc.subject | Drug resistance | |
| dc.subject | Glucose uptake | |
| dc.subject | Leishmania | |
| dc.subject | Metabolic substrate | |
| dc.title | Substrate preferences and glucose uptake in glibenclamide-resistant Leishmania parasites | |
| dc.type | Article | |
