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Updated: May 19, 2026
Quantification of Intracellular Growth Inside Macrophages is a Fast and Reliable Method for Assessing the Virulence of Leishmania Parasites
Published on: March 16, 2018
Impact of Leishmania metalloprotease GP63 on macrophage signaling
Amandine Isnard1, Marina T Shio, Martin Olivier
1Faculty of Medicine, Department of Medicine, Microbiology, and Immunology, The Research Institute of the McGill University Health Centre, McGill University Montréal, QC, Canada.
Abstract:
The intramacrophage protozoan parasites of Leishmania genus have developed sophisticated ways to subvert the innate immune response permitting their infection and propagation within the macrophages of the mammalian host. Several Leishmania virulence factors have been identified and found to be of importance for the development of leishmaniasis. However, recent findings are now further reinforcing the critical role played by the zinc-metalloprotease GP63 as a virulence factor that greatly influence host cell signaling mechanisms and related functions. GP63 has been found to be involved not only in the cleavage and degradation of various kinases and transcription factors, but also to be the major molecule modulating host negative regulatory mechanisms involving for instance protein tyrosine phosphatases (PTPs). Those latter being well recognized for their pivotal role in the regulation of a great number of signaling pathways. In this review article, we are providing a complete overview about the role of Leishmania GP63 in the mechanisms underlying the subversion of macrophage signaling and functions.
Insights
Leishmania parasites use the GP63 virulence factor to disrupt macrophage signaling. This zinc-metalloprotease degrades key proteins and modulates host defenses, aiding parasite survival.
Area of Science:
- Immunology
- Parasitology
- Molecular Biology
Background:
- Leishmania parasites infect macrophages, evading host immunity.
- Virulence factors are crucial for Leishmania infection and leishmaniasis development.
- The zinc-metalloprotease GP63 is a key Leishmania virulence factor.
Purpose of the Study:
- To provide a comprehensive overview of Leishmania GP63's role.
- To elucidate mechanisms of macrophage signaling subversion by GP63.
- To highlight GP63's influence on host cell functions.
Main Methods:
- Review of existing literature on Leishmania virulence factors.
- Analysis of studies investigating GP63's enzymatic activity.
- Examination of research on GP63's impact on host cell signaling pathways.
Main Results:
- GP63 cleaves and degrades host kinases and transcription factors.
- GP63 is a major modulator of host negative regulatory mechanisms, including protein tyrosine phosphatases (PTPs).
- GP63 significantly influences signaling pathways critical for macrophage function.
Conclusions:
- Leishmania GP63 is essential for subverting macrophage innate immune responses.
- GP63's modulation of host signaling pathways is critical for parasite propagation.
- Understanding GP63's function offers insights into leishmaniasis pathogenesis.
