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Updated: Mar 21, 2026
08:17
Deciphering the Molecular Mechanism and Function of Pore-Forming Toxins Using Leishmania major
Published on: October 28, 2022
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RIPK1 and PGAM5 Control Leishmania Replication through Distinct Mechanisms
Nivea Farias Luz1, Sakthi Balaji2, Kendi Okuda3
1Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605; Centro de Pesquisas Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador-BA, 40110-060, Brazil;
Journal of Immunology (Baltimore, Md. : 1950)
|May 17, 2016
Summary
Heme and necroptosis pathways, involving RIPK1 and PGAM5, control Leishmania parasite replication. These host cell death mechanisms offer new therapeutic targets for leishmaniasis, a significant tropical disease.
Area of Science:
- Parasitology
- Immunology
- Cell Biology
Background:
- Leishmaniasis is a widespread parasitic disease affecting millions globally.
- Understanding host cell death pathways controlling Leishmania replication is crucial.
- Necroptosis, mediated by RIPK1, is a key cell death pathway.
Purpose of the Study:
- To investigate the role of heme and necroptosis in controlling Leishmania replication.
- To explore the involvement of RIPK1 and PGAM5 in host defense against Leishmania.
Main Methods:
- Assessing Leishmania replication in macrophages with varying heme and RIPK1/PGAM5 levels.
- Measuring IL-1β and NO production in response to Leishmania infection.
- Analyzing RIPK1 kinase activity and PGAM5 function in mouse infection models.
Main Results:
- Heme significantly inhibited Leishmania replication in macrophages.
- Inhibition of RIPK1 kinase activity increased parasite replication.
- Both RIPK1 and PGAM5 are required for IL-1β expression, but PGAM5 independently drives IL-1β secretion and NO production.
Conclusions:
- RIPK1 and PGAM5 independently regulate Leishmania replication.
- Heme and necroptosis pathways represent potential host-directed therapeutic strategies for leishmaniasis.
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