Abstract
Release of reactive oxygen species (ROS) by cells from BALB/c mice was studied during the acute stage of the infection with 50 bloodstream forms of Trypanosoma cruzi, Tulahuén strain. Production of ROS by spleen and peritoneal cells was evaluated by chemiluminescence using luminol as enhancer (CL-Lum). Three to four weeks after infection, CL-Lum response after the addition of opsonized zymosan to spleen and peritoneal cells from infected mice was 13 and 98 times, respectively, above the levels obtained with cells from noninfected mice. The kinetics of this hyperactivity was similar to that of the parasitemia. Both reached maximal values on the third to fourth weeks and decreased at 7 weeks postinfection. During this hyperactivation stage, spleen and peritoneal cells from infected mice showed a "spontaneous" CL-Lum response (without any stimulus added in vitro) absent in noninfected mice. Both, "spontaneous" and zymosan stimulated CL-Lum responses were inhibited by 100 microM azide and by 0.8 microM superoxide dismutase, suggesting the involvement of hemoproteins and superoxide anion in the measured responses. Moreover, spleen cells from acutely infected mice displayed a hyperactivity in the CL-Lum response when recombinant inte...Continue Reading
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