TNF inhibits IL-4-induced Arg1 expression in macrophages and dendritic cells
Arg1 is upregulated in macrophages or dendritic cells of L. major-infected TNF−/− mice
Arg1 hyperexpression in TNF−/− mice impairs in situ production of leishmanicidal NO
Arg1 deletion restores parasite and disease control in otherwise non-healing mice