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Title: Host cell invasion by Trypanosoma cruzi is potentiated by activation of bradykinin B-2 receptors
Authors: Scharfstein, J.
Schmitz, V
Morandi, V
Capella, MMA
Lima, APCA
Morrot, A.
Juliano, Luiz [UNIFESP]
Muller-Esterl, W.
Universidade Federal do Rio de Janeiro (UFRJ)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Federal de São Paulo (UNIFESP)
Univ Frankfurt
Keywords: Trypanosoma cruzi
cysteine proteinases
kinin receptors
Issue Date: 6-Nov-2000
Publisher: Rockefeller Univ Press
Citation: Journal of Experimental Medicine. New York: Rockefeller Univ Press, v. 192, n. 9, p. 1289-1299, 2000.
Abstract: The parasitic protozoan Trypanosoma cruzi employs multiple molecular strategies to invade a broad range of nonphagocytic cells. Here we demonstrate that the invasion of human primary umbilical vein endothelial cells (HUVECs) or Chinese hamster ovary (CHO) cells overexpressing the B-2 type of bradykinin receptor (CHO-B2R) by tissue culture trypomastigotes is subtly modulated by the combined activities of kininogens, kininogenases, and kinin-degrading peptidases. the presence of captopril, an inhibitor of bradykinin degradation by kininase II, drastically potentiated parasitic invasion of HUVECs and CHO-B2R, but not of mock-transfected CHO cells, whereas the B2R antagonist HOE 140 or monoclonal antibody MBK3 to bradykinin blocked these effects. Invasion competence correlated with the parasites' ability to Liberate the short-lived kinins from cell-bound kininogen and to elicit vigorous intracellular free calcium ([Ca2+](i)) transients through B2R. Invasion was impaired by membrane-permeable cysteine proteinase inhibitors such as Z-(SBz)Cys-Phe-CHN2 but not by the hydrophilic inhibitor 1-trans-epoxysuccinyl-L-leucyl-amido-(4-guanidino) butane or cystatin C, suggesting that kinin release is confined to secluded spaces formed by juxtaposition of host cell and parasite plasma membranes. Analysis of trypomastigote transfectants expressing various cysteine proteinase isoforms showed that invasion competence is linked to the kinin releasing activity of cruzipain, herein proposed as a factor of virulence in Chagas' disease.
ISSN: 0022-1007
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