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Immune reactivity to fractionated Leishmania aethiopica antigens during active human infection

T Laskay1, H G Mariam, T Y Berhane

  • 1Armauer Hansen Research Institute, Addis Ababa, Ethiopia.

Journal of Clinical Microbiology
|April 1, 1991
PubMed

Insights

Leishmania aethiopica parasite antigens, particularly those under 22 kDa, trigger significant T-cell proliferation and immune responses in patients with cutaneous leishmaniasis, suggesting key targets for immune activity.

Area of Science:

  • Immunology
  • Parasitology
  • Molecular Biology

Background:

  • Cutaneous leishmaniasis is a significant global health concern caused by Leishmania parasites.
  • Understanding the immune response to Leishmania antigens is crucial for developing effective treatments and vaccines.

Purpose of the Study:

  • To identify specific Leishmania aethiopica antigen fractions recognized by T cells in patients with active cutaneous leishmaniasis.
  • To investigate the correlation between antigen recognition, lymphocyte proliferation, and cytokine production.

Main Methods:

  • Fractionation of Leishmania aethiopica parasite antigens based on molecular mass.
  • Stimulation of peripheral blood lymphocytes from patients with active cutaneous leishmaniasis.
  • Assays for lymphocyte proliferation, gamma interferon (IFN-γ), and tumor necrosis factor alpha (TNF-α) production.

Main Results:

  • Nine out of ten patients showed similar proliferation patterns to fractionated antigens.
  • Significant T-cell proliferation and elevated IFN-γ and TNF-α levels were observed in response to low-molecular-mass antigens (< 22 kDa, 27-33 kDa, 36-43 kDa).
  • Antigens > 60 kDa elicited uniformly low proliferative and cytokine responses.

Conclusions:

  • Leishmania aethiopica antigens recognized by T cells in active cutaneous leishmaniasis are primarily associated with lower-molecular-mass fractions.
  • The induction of lymphocyte proliferation, IFN-γ, and TNF-α by these fractions suggests potential disease-limiting immune effector mechanisms.

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