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Effects of LaLRR17 protein from Leishmania (L.) amazonensis in macrophage infection and identification of its possible ligands

Grant number: 12/19135-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): January 01, 2013
Effective date (End): May 07, 2017
Field of knowledge:Biological Sciences - Parasitology - Protozoology of Parasites
Principal researcher:Beatriz Simonsen Stolf
Grantee:Mauricio Scavassini Peña
Home Institution: Instituto de Ciências Biomédicas (ICB). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Leishmania ssp. are protozoan parasites transmitted to vertebrates by the bite of female phlebotomine insects. They have two main forms in their life cycle: promastigotes and amastigotes. The amastigotes live preferably in macrophages, "professional phagocytes" capable of destroying pathogens. They are able to circumvent the microbicidal activity of macrophages, survive and multiply inside them. This ability is due to several molecules produced by the parasite, called virulence factors, which help their internalization and proliferation inside the macrophage. The protein LaLRR17 of L. (L) amazonensis contains in its central region six leucine-rich repeats (LRRs). The LRR motifs of various organisms are usually involved in protein-protein interactions. LaLRR17 is expressed in promastigotes and amastigotes, and was detected in the cytoplasm of the infected macrophage. Parasites overexpressing this protein showed increased infectivity in vitro. It is therefore plausible to assume that LaLRR17 participates in interactions with macrophage molecules, and that these interactions may modulate the response of the host cell. However, we do not know which molecules from the macrophage interact with LaLRR17. Phage display is a technique based on protein expression in synthetic phage capsids that has been used for various purposes including the identification of protein ligands. The application of Phage Display over the recombinant LaLRR17 may identify ligands of this protein in the macrophage and explain its contribution to the virulence of the parasite. Furthermore, analysis of the location and effects of the protein during infection of macrophages will give more information about the role of LaLRR17 in the interaction between Leishmania and its host cell.

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PEÑA, Mauricio Scavassini. Effects of LaLRR17 protein from Leishmania (L.) amazonensis in macrophage infection and identification of its possible ligands.. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) São Paulo.

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