Proteomic analysis of exosomes derived from procyclic and metacyclic-like cultured Leishmania infantum chagasi.

Journal of Proteomics
David M ForrestYara Maria Traub-Csekö

Abstract

Leishmania infantum chagasi is the primary etiological agent of visceral leishmaniasis in Latin America, a lethal disease that afflicts hundreds of thousands of people worldwide every year. Previous studies have shown that the parasite releases microvesicles known as exosomes, which prolong and exacerbate infection in the vertebrate vector. However, little is known of their role in the insect vector, the sand fly Lutzomyia longipalpis. Exosomes were isolated from cultured L. i. chagasi in logarithmic (procyclic) (LOG) and stationary phase (metacyclic-like) (STAT) growth stages, which are the parasite stages found in the vector, and submitted to proteomic analysis. Our studies showed that exosomes from LOG and STAT L. i. chagasi display discrete protein profiles. The presence of approximately 50 known virulence factors was detected, including molecules for immunomodulation and evasion (GP63, EF1α, Oligopeptidase), increased pathogenicity (Casein kinase, KMP-11, Cysteine Peptidase and BiP) and parasite protection (Peroxidoxin). Additionally, the majority of ontological terms were associated with both exosome phases, and no substantial ontological enrichment was observed associated with any of the two exosomal stages. We demonstra...Continue Reading

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Jan 16, 2021·Biochemical Society Transactions·Thalia Pacheco-FernandezAbhay R Satoskar
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