Melittin peptide kills Trypanosoma cruzi parasites by inducing different cell death pathways
Camila M Adade1, Isabelle R S Oliveira, Joana A R Pais
1Laboratório de Biologia Celular e Ultraestrutura, Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, bloco I, Universidade Federal do Rio de Janeiro, Ilha do Fundão, Rio de Janeiro, RJ 21941-590, Brazil.
Abstract:
Antimicrobial peptides (AMPs) are components of the innate immune response that represent desirable alternatives to conventional pharmaceuticals, as they have a fast mode of action, a low likelihood of resistance development and can act in conjunction with existing drug regimens. AMPs exhibit strong inhibitory activity against both Gram-positive and Gram-negative bacteria, fungi, viruses, metazoans and other parasites, such as the protozoan Leishmania. Melittin is a naturally occurring AMP, which comprises 40-50% of the dry weight of Apis mellifera venom. Our group has recently shown that crude A. mellifera venom is lethal to Trypanosoma cruzi, the Chagas disease etiologic agent, and generates a variety of cell death phenotypes among treated parasites. Here, we demonstrate that the melittin affected all of T. cruzi developmental forms, including the intracellular amastigotes. The ultrastructural changes induced by melittin suggested the occurrence of different programmed cell death pathways, as was observed in A. mellifera-treated parasites. Autophagic cell death appeared to be the main death mechanism in epimastigotes. In contrast, melittin-treated trypomastigotes appeared to be dying via an apoptotic mechanism. Our findings confirm the great potential of AMPs, including melittin, as a potential source of new drugs for the treatment of neglected diseases, such as Chagas disease.
Insights
Antimicrobial peptides like melittin show promise for treating Chagas disease. Melittin effectively targets all developmental forms of the parasite Trypanosoma cruzi, offering a potential new drug source.
Area of Science:
- Immunology
- Parasitology
- Biochemistry
Background:
- Antimicrobial peptides (AMPs) are crucial innate immune components with therapeutic potential against various pathogens.
- Melittin, a primary component of bee venom, is a well-studied AMP with broad-spectrum activity.
- Trypanosoma cruzi, the causative agent of Chagas disease, remains a significant global health concern with limited treatment options.
Purpose of the Study:
- To investigate the efficacy of melittin against all developmental forms of Trypanosoma cruzi.
- To elucidate the mechanisms of cell death induced by melittin in T. cruzi.
- To assess the potential of melittin as a therapeutic agent for Chagas disease.
Main Methods:
- Treatment of T. cruzi cultures (epimastigotes, trypomastigotes, amastigotes) with purified melittin.
- Ultrastructural analysis of melittin-treated parasites using electron microscopy.
- Observation and characterization of cell death phenotypes.
Main Results:
- Melittin demonstrated lethal activity against all developmental stages of T. cruzi, including intracellular amastigotes.
- Ultrastructural changes indicated distinct programmed cell death pathways induced by melittin.
- Epimastigotes primarily underwent autophagic cell death, while trypomastigotes exhibited apoptotic mechanisms.
Conclusions:
- Melittin effectively targets all forms of T. cruzi, suggesting its potential as a novel anti-parasitic agent.
- The induction of distinct cell death pathways highlights melittin's versatile mechanism of action.
- AMPs, exemplified by melittin, represent a promising avenue for developing new treatments for neglected diseases like Chagas disease.
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