RIPK1 and PGAM5 Control Leishmania Replication through Distinct Mechanisms.
Nivea Farias LuzSakthi BalajiKendi OkudaAline Silva BarretoJohn BertinPeter J GoughRicardo GazzinelliRoque P AlmeidaMarcelo Torres BozzaValéria Matos BorgesFrancis Ka-Ming ChanPublished in: Journal of immunology (Baltimore, Md. : 1950) (2016)
Leishmaniasis is an important parasitic disease found in the tropics and subtropics. Cutaneous and visceral leishmaniasis affect an estimated 1.5 million people worldwide. Despite its human health relevance, relatively little is known about the cell death pathways that control Leishmania replication in the host. Necroptosis is a recently identified form of cell death with potent antiviral effects. Receptor interacting protein kinase 1 (RIPK1) is a critical kinase that mediates necroptosis downstream of death receptors and TLRs. Heme, a product of hemoglobin catabolism during certain intracellular pathogen infections, is also a potent inducer of macrophage necroptosis. We found that human visceral leishmaniasis patients exhibit elevated serum levels of heme. Therefore, we examined the impact of heme and necroptosis on Leishmania replication. Indeed, heme potently inhibited Leishmania replication in bone marrow-derived macrophages. Moreover, we found that inhibition of RIPK1 kinase activity also enhanced parasite replication in the absence of heme. We further found that the mitochondrial phosphatase phosphoglycerate mutase family member 5 (PGAM5), a putative downstream effector of RIPK1, was also required for inhibition of Leishmania replication. In mouse infection, both PGAM5 and RIPK1 kinase activity are required for IL-1β expression in response to Leishmania However, PGAM5, but not RIPK1 kinase activity, was directly responsible for Leishmania-induced IL-1β secretion and NO production in bone marrow-derived macrophages. Collectively, these results revealed that RIPK1 and PGAM5 function independently to exert optimal control of Leishmania replication in the host.
Keyphrases
- protein kinase
- cell death
- human health
- end stage renal disease
- risk assessment
- tyrosine kinase
- chronic kidney disease
- endothelial cells
- newly diagnosed
- oxidative stress
- ejection fraction
- poor prognosis
- prognostic factors
- regulatory t cells
- adipose tissue
- single cell
- peritoneal dialysis
- climate change
- cell proliferation
- cell cycle arrest
- anti inflammatory
- dendritic cells
- bone marrow
- patient reported
- high glucose