Glucose uptake in the mammalian stages of Trypanosoma cruzi

Autor(es)

Silber, Ariel M. ^[1] ; Tonelli, Rnata R. ^[1] ; Lopes, Camila G. ^[1] ; Cunha-e-Silva, Narcisa ^[2] ; Torrecilhas, Ana Claudia T. ^[1] ; Schumacher, Robert I. ^[1] ; Colli, Walter ^[1] ; Alves, Maria Julia M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Bioquim, Inst Quim, BR-05508900 Sao Paulo - Brazil

^[2] Univ Fed Rio de Janeiro, Inst Biofis Carlos Chagas Filho, CCS, BR-21949900 Rio De Janeiro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Molecular and Biochemical Parasitology; v. 168, n. 1, p. 102-108, NOV 2009.
• Citações Web of Science: 34

Resumo

Trypanosoma cruzi, the agent of Chagas' disease, alternates between different morphogenetic stages that face distinct physiological conditions in their invertebrate and vertebrate hosts, likely in the availability of glucose. While the glucose transport is well characterized in epimastigotes of T cruzi, nothing is known about how the mammalian stages acquire this molecule. Herein glucose transport activity and expression were analyzed in the three developmental stages present in the vertebrate cycle of T cruzi. The infective trypomastigotes showed the highest transport activity (V(max) = 5.34 +/- 0.54 nmol/min per mg of protein: K(m) = 0.38 +/- 0.01 mM) when compared to intracellular epimastigotes (V(max) = 2.18 +/- 0.20 nmol/min per mg of protein; K(m) = 0.39 +/- 0.01 mM). Under the conditions employed no transport activity could be detected in amastigotes. The gene of the glucose transporter is expressed at the mRNA level in trypomastigotes and in intracellular epimastigotes but not in amastigotes, as revealed by real-time PCR. In both trypomastigotes and intracellular epimastigotes protein expression could be detected by Western blot with an antibody raised against the glucose transporter correlating well with the transport activity measured experimentally. Interestingly, anti-glucose transporter antibodies showed a strong reactivity with glycosome and reservosome organelles. A comparison between proline and glucose transport among the intracellular differentiation forms is presented. The data suggest that the regulation of glucose transporter reflects different energy and carbon requirements along the intracellular life cycle of T cruzi. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 04/03303-5 - Interação entre Trypanosoma cruzi e hospedeiro: ligantes, receptores e condicionantes do desenvolvimento intracelular
• Beneficiário: Maria Julia Manso Alves
• Modalidade de apoio: Auxílio à Pesquisa - Temático