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Apoptotic induction induces Leishmania aethiopica and L. mexicana spreading in terminally differentiated THP-1 cells

  • RAJEEV RAI (a1), PAUL DYER (a1), SIMON RICHARDSON (a1), LAURENCE HARBIGE (a1) and GIULIA GETTI (a1)...
Summary
Summary

Leishmaniasis develops after parasites establish themselves as amastigotes inside mammalian cells and start replicating. As relatively few parasites survive the innate immune defence, intracellular amastigotes spreading towards uninfected cells is instrumental to disease progression. Nevertheless the mechanism of Leishmania dissemination remains unclear, mostly due to the lack of a reliable model of infection spreading. Here, an in vitro model representing the dissemination of Leishmania amastigotes between human macrophages has been developed. Differentiated THP-1 macrophages were infected with GFP expressing Leishmania aethiopica and Leishmania mexicana. The percentage of infected cells was enriched via camptothecin treatment to achieve 64·1 ± 3% (L. aethiopica) and 92 ± 1·2% (L. mexicana) at 72 h, compared to 35 ± 4·2% (L. aethiopica) and 36·2 ± 2·4% (L. mexicana) in untreated population. Infected cells were co-cultured with a newly differentiated population of THP-1 macrophages. Spreading was detected after 12 h of co-culture. Live cell imaging showed inter-cellular extrusion of L. aethiopica and L. mexicana to recipient cells took place independently of host cell lysis. Establishment of secondary infection from Leishmania infected cells provided an insight into the cellular phenomena of parasite movement between human macrophages. Moreover, it supports further investigation into the molecular mechanisms of parasites spreading, which forms the basis of disease development.

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Corresponding author
*Corresponding author: Department of Life and Sport Science, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK. E-mail: G.T.M.Getti@greenwich.ac.uk
References
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Parasitology
  • ISSN: 0031-1820
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