Abstract
Several cytokines play crucial roles in Trypanosoma cruzi infection in mice, but the involvement of endogenous granulocyte-macrophage colony-stimulating factor (GM-CSF) is poorly documented. This report shows that T. cruzi infection of mice triggered an early and sharp increase in plasma GM-CSF during the ascending phase of parasitemia. The plasma GM-CSF concentration remained stable at the peak of parasitemia and subsequently increased in those mice that survived to the acute phase. GM-CSF level increased again sharply, while parasitemia was rapidly decreasing. Finally, GM-CSF was undetectable, soon after the disappearance of circulating parasites. Injection of T. cruzi-infected mice with neutralizing anti-GM-CSF monoclonal antibodies induced the early appearance of parasitemia and aggravated cumulative mortality. In contrast, recombinant mouse GM-CSF (rmGM-CSF) caused sharp decreases in both parasitemia and cumulative mortality in T. cruzi-infected mice. Peritoneal macrophages from rmGM-CSF-treated and infected or uninfected mice were less infected ex vivo than those from control mice. Taken together these data demonstrate the protective action of endogenous GM-CSF in T. cruzi infection. Neutralization of endogenous GM-CSF aggravates infection, while exogenous rmGM-CSF decreases both parasitemia and host mortality.
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Selected References
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