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Parasitology Research

, Volume 113, Issue 6, pp 2121–2128 | Cite as

Correlation between glucose uptake and membrane potential in Leishmania parasites isolated from DCL patients with therapeutic failure: a proof of concept

  • Maritza Padrón-Nieves
  • Claudia Machuca
  • Emilia Díaz
  • Paulo Cotrim
  • Noris Rodriguez
  • Alicia Ponte-SucreEmail author
Original Paper

Abstract

Besides infection with drug-resistant parasites, therapeutic failure in leishmaniasis may be caused by altered drug pharmacokinetics, re-infection, and host immunologic compromise. Our aim has been to evaluate if relapses that occur in patients suffering from diffuse cutaneous leishmaniasis (DCL) associate with changes in the fitness of infecting organisms. Therefore, in isolates from patients suffering DCL, we correlated glucose uptake and plasma membrane potential and compared the results with those obtained from reference strains. The data demonstrate that Leishmania parasites causing DCL incorporate glucose at an efficient rate, albeit without significant changes in the plasma membrane potential as their corresponding reference strains. The isolate that did not change its accumulation rate of glucose compared to its reference strain expressed a less polarized membrane potential that was insensitive to mitochondrial inhibitors, suggesting a metabolic dysfunction that may result in glycolysis being the main source of ATP. The results constitute a proof of concept that indicates that parasites causing DCL adapted well to drug pressure and expressed an increased fitness. That is, that in Leishmania mexicana and Leishmania amazonensis, parasites isolated from DCL patients, a strong modification of the parasite physiology might occur. As consequences, the parasites adapted well to drug pressure, increased their fitness, and they had an efficient glucose uptake rate albeit not significant changes in membrane potential as their corresponding reference strains. Further validation of the concepts herein established and whether or not the third isolate corresponds with a drug-resistant phenotype need to be demonstrated at the genetic level.

Keywords

Diffuse cutaneous leishmaniasis Drug resistance markers Glucose uptake Leishmania Membrane potential 

Notes

Acknowledgments

The authors are grateful to Mrs. Pilar López for her technical assistance. Likewise they are grateful for the support conferred by the Alexander von Humboldt Foundation, Germany to Alicia Ponte-Sucre. The authors are grateful to the Universidad Central de Venezuela Council for Research, grants CDCH-UCV PI-09-8717-2013/1 and PG-09-8646-2013/1. This project was approved by the Ethical Committee of the Institute of Biomedicine, Universidad Central de Venezuela.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Maritza Padrón-Nieves
    • 1
  • Claudia Machuca
    • 1
  • Emilia Díaz
    • 1
  • Paulo Cotrim
    • 2
  • Noris Rodriguez
    • 3
  • Alicia Ponte-Sucre
    • 1
    Email author
  1. 1.Laboratorio de Fisiología Molecular, Instituto de Medicina Experimental, Facultad de MedicinaUniversidad Central de VenezuelaCaracasVenezuela
  2. 2.Dpto. Moléstias Infecciosas e ParasitáriasInstituto de Medicina Tropical de São PauloSão PauloBrazil
  3. 3.Laboratorio de Ingeniería Genética, Instituto de BiomedicinaUniversidad Central de VenezuelaCaracasVenezuela

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