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[Effects of cytokine-activated macrophages on intracellular leishmania]

C Xue1, P Kaye

  • 1Department of Parasitology, Henan Medical University, Zhengzhou.

Zhonghua Yi Xue Za Zhi
|June 1, 1995
PubMed

Insights

Recombinant IFN-γ or TNF-α activates macrophages to combat Leishmania donovani, reducing parasite load. This cytokine-induced macrophage activation offers a potential strategy against leishmaniasis.

Area of Science:

  • Immunology
  • Parasitology

Context:

  • Leishmania donovani is a protozoan parasite that causes leishmaniasis, a neglected tropical disease.
  • Macrophages play a crucial role in the host immune response against Leishmania donovani.

Purpose:

  • To investigate the in vitro effects of recombinant interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and interleukin-3 (IL-3) on macrophage activation and their leishmanicidal activity against Leishmania donovani amastigotes.

Summary:

  • Recombinant IFN-γ or TNF-α, particularly when used synergistically, significantly enhanced macrophage activity and leishmanicidal capacity against Leishmania donovani amastigotes in vitro.
  • Activated macrophages showed a reduced infection rate (16%) and parasite burden (1.2 parasites/macrophage) compared to control (62% infection, 6.8 parasites/macrophage).
  • Nitrite (NO2-) release in culture supernatants correlated with the enhanced ability of cytokine-activated macrophages to kill intracellular parasites, while IL-3 alone or with IFN-γ did not show significant leishmanicidal effects.

Impact:

  • This study highlights the potential of IFN-γ and TNF-α in modulating macrophage function for controlling Leishmania donovani infection.
  • The findings suggest that cytokine-based therapies could be explored for treating leishmaniasis.

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