HELA-CELLS EXTEND AND INTERNALIZE PSEUDOPODIA DURING ACTIVE INVASION BY TRYPANOSOMA-CRUZI TRYPOMASTIGOTES

HELA-CELLS EXTEND AND INTERNALIZE PSEUDOPODIA DURING ACTIVE INVASION BY TRYPANOSOMA-CRUZI TRYPOMASTIGOTES

Author Schenkman, Sergio Autor UNIFESP Google Scholar
Mortara, R. A. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract We show here that HeLa cell microfilaments can be stained by phatloidin at the sites of invasion of Trypanosoma cruzi trypomastigotes, one of the infective stages of this protozoan parasite. Concurrently, a projection of the HeLa cell plasmalemma encircles invading parasites. This plasmalemma projection is further internalized and entire membrane protrusions containing parasites are found within cytoplasmic vacuoles of the host cell. Neither the microfilament staining around invading parasites nor the plasma-lemma extension is inhibited by cytochalasin D, a drug that is unable to prevent trypomastigote entry into HeLa cells. The internalization of the membrane expansion, however, is blocked by the drug. These novel observations indicate that although the driving force for T. cruzi penetration comes from the parasite, the cortical target cytoskeleton of the target cell is concomitantly modified. The molecular characterization of this phenomenon may provide a new insight into the understanding of the mechanisms involved in the active penetration of T. cruzi into mammalian cells.
Keywords TRYPANOSOMA-CRUZI
ACTIN
MICROFILAMENTS
HELA CELLS
CYTOCHALASIN-D
INVASION
PSEUDOPODIA
MEMBRANE
Language English
Date 1992-04-01
Published in Journal Of Cell Science. Cambridge: Company Of Biologists Ltd, v. 101, p. 895-905, 1992.
ISSN 0021-9533 (Sherpa/Romeo, impact factor)
Publisher Company Of Biologists Ltd
Extent 895-905
Origin http://jcs.biologists.org/content/101/4/895
Access rights Open access Open Access
Type Article
Web of Science ID WOS:A1992HR16000016
URI http://repositorio.unifesp.br/11600/44231

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