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TRANSFERRIN UPTAKE IN TRYPANOSOMA CRUZI IS IMPAIRED BY INTERFERENCE ON CYTOSTOME-ASSOCIATED CYTOSKELETON ELEMENTS AND STABILITY OF MEMBRANE CHOLESTEROL, BUT NOT BY OBSTRUCTION OF CLATHRIN-DEPENDENT ENDOCYTOSIS
Microscopia eletrônica de transmissão
Endocitose
Transferrina
Citoesqueleto
Citostome
Colesterol da membrana
Transmission electron microscopy
Transferrin
Endocytosis
Cytoskeleton
Membrane cholesterol
Clathrin
Produção científica do Laboratório de Ultraestrutura Celular.
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Ultraestrutura Celular. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Centro de Ciências da Saúde. Instituto de Bioquímica Médica. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Celular. Rio de Janeiro, RJ, Brasil.
Instituto de Biologia Molecular do Paraná. Curitiba, PR, Brasil / Fundação Oswaldo Cruz. Instituto Carlos Chagas. Curitiba, PR, Brasil.
Universidade Federal do Rio de Janeiro. Centro de Ciências da Saúde. Instituto de Bioquímica Médica. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia Celular. Rio de Janeiro, RJ, Brasil.
Instituto de Biologia Molecular do Paraná. Curitiba, PR, Brasil / Fundação Oswaldo Cruz. Instituto Carlos Chagas. Curitiba, PR, Brasil.
Abstract
Transferrin uptake by Trypanosoma cruzi epimastigotes occurs mainly through the cytostome/cytopharynx. Here, we present evidences for the association of sterol-rich membrane domains with the transferrin endocytic site. Assays using pharmacological treatments to disrupt clathrin-coated pits and hinder caveolae formation showed no association between transferrin uptake and clathrin-dependent endocytosis, but indicated that cholesterol stability in membrane domains is essential for the endocytosis of transferrin. Furthermore, it was observed a connection between the integrity of cytoskeleton elements at the cytopharynx and the function of the cytostome. Our data show that T. cruzi epimastigotes depend on a specialized pathway for transferrin uptake, which is cholesterol-dependent, clathrin-independent, and closely associated with the structural stability of the cytostome/cytopharynx cytoskeleton.
Keywords in Portuguese
Trypanosoma cruziMicroscopia eletrônica de transmissão
Endocitose
Transferrina
Citoesqueleto
Citostome
Colesterol da membrana
Keywords
Trypanosoma cruziTransmission electron microscopy
Transferrin
Endocytosis
Cytoskeleton
Membrane cholesterol
Clathrin
Publisher
Elsevier
Citation
CORRÊA, José Raimundo et al. Transferrin uptake in Trypanosoma cruzi is impaired by interference on cytostome-associated cytoskeleton elements and stability of membrane cholesterol, but not by obstruction of clathrin-dependent endocytosis. Experimental Parasitology, v. 119, p. 58-66, Dec. 2008.DOI
10.1016/j.exppara.2007.12.010ISSN
0014-4894Notes
Produção científica do Laboratório de Biologia Celular.Produção científica do Laboratório de Ultraestrutura Celular.
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