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Cutaneous Leishmaniasis in the Dorsal Skin of Hamsters: a Useful Model for the Screening of Antileishmanial Drugs
Published on: April 21, 2012
Visceral leishmaniasis: a model for infection-induced cachexia.
R D Pearson1, G Cox, S M Jeronimo
1Department of Medicine, University of Virginia Health Sciences Center, Charlottesville.
Summary
Malnutrition worsens visceral leishmaniasis (kala-azar) by impairing immunity. Infected hamsters show weight loss linked to inflammatory cytokines, suggesting complex mechanisms beyond reduced food intake in parasitic disease.
Area of Science:
- Parasitology
- Immunology
- Nutritional Science
Background:
- Parasitic infections and malnutrition are prevalent in tropical/subtropical regions.
- Malnutrition compromises cell-mediated immunity, increasing susceptibility to visceral leishmaniasis (kala-azar).
- Leishmania donovani infection causes wasting, hepatosplenomegaly, fever, and anemia.
Purpose of the Study:
- To investigate the interplay between malnutrition and Leishmania donovani infection.
- To understand the mechanisms of wasting and cachexia in visceral leishmaniasis.
- To explore potential therapeutic targets for cachexia in parasitic diseases.
Main Methods:
- Utilized experimental models of Leishmania donovani infection in Syrian hamsters.
- Assessed cell-mediated immunity and cytokine profiles (interleukin-1, tumor necrosis factor/cachectin).
- Evaluated food intake and skeletal muscle function in infected animals.
Main Results:
- Malnutrition exacerbates visceral leishmaniasis development and severity.
- Infected hamsters exhibited weight loss associated with splenic macrophage secretion of catabolic cytokines.
- Reduced food intake contributed to wasting, but skeletal muscle dysfunction also played a role.
Conclusions:
- Visceral leishmaniasis and malnutrition have a complex, bidirectional relationship.
- Cytokine-mediated catabolism is a key factor in parasitic disease-induced wasting.
- Leishmania donovani-infected hamster models are valuable for studying cachexia and drug development.
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