Interleukin-4 inhibits human macrophage activation by tumor necrosis factor, granulocyte-monocyte colony-stimulating factor, and interleukin-3 for antileishmanial activity and oxidative burst capacity - PubMed (original) (raw)

Interleukin-4 inhibits human macrophage activation by tumor necrosis factor, granulocyte-monocyte colony-stimulating factor, and interleukin-3 for antileishmanial activity and oxidative burst capacity

J L Ho et al. J Infect Dis. 1992 Feb.

Abstract

Interleukin (IL)-4 has been implicated in the pathogenesis of leishmaniasis in a murine model. Experiments were done to examine the effect of IL-4 on cytokine activation of macrophages. Interferon (IFN)-gamma, granulocyte-macrophage colony-stimulating factor (GM-CSF), tumor necrosis factor-alpha (TNF alpha), and IL-3 activate macrophages to inhibit replication of leishmaniae. IL-4 abrogated in a dose- and time-dependent manner the induction of antileishmanial activity by these cytokines. The depression of oxidative burst capacity is one mechanism by which IL-4 inhibits macrophage activation. IL-4 diminished in a dose- and time-dependent manner the TNF alpha enhancement of oxidative capacity. Pretreatment with IL-4 for 48, 24, or 0 h, respectively, inhibited the generation of superoxide induced by TNF alpha by 90%, 60%, and 40%. Furthermore, IL-4 abrogated the enhancement of oxidative capacity by IFN-gamma, GM-CSF, and IL-3. These data suggest that IL-4 is a potent deactivator of macrophage antimicrobial functions and may contribute to the pathogenesis of visceral leishmaniasis.

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Interleukin-4 inhibits human macrophage activation by tumor necrosis factor, granulocyte-monocyte colony-stimulating factor, and interleukin-3 for antileishmanial activity and oxidative burst capacity - PubMed (original) (raw)