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The Role of Leishmania GP63 in Modulation of Innate Inflammatory Response to Leishmania major Infection

ABSTRACT: The Role of Leishmania GP63 in Modulation of Innate Inflammatory Response to Leishmania major Infection

PROVIDER: PRJNA782881 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17015101_1.fastq.gz	Fastqsanger.gz
	SRR17015101_2.fastq.gz	Fastqsanger.gz
	SRR17015102_1.fastq.gz	Fastqsanger.gz
	SRR17015102_2.fastq.gz	Fastqsanger.gz
	SRR17015103_1.fastq.gz	Fastqsanger.gz

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The Role of Leishmania GP63 in Modulation of Innate Inflammatory Response to Leishmania major Infection

Project description:Leishmaniasis is a disease caused by the protozoan parasite Leishmania known to affect millions of individuals worldwide. In recent years, we have established the critical role played by Leishmania zinc-metalloprotease GP63 in the modulation of host macrophage signaling and functions, favouring its survival and progression within its host. Leishmania major lacking GP63 was reported to cause limited infection in mice, however it is still unclear how GP63 may influence the innate inflammatory response and parasite survival in an in vivo context. Therefore, we were interested in analyzing the early innate inflammatory events upon Leishmania inoculation within mice and establish whether Leishmania GP63 influences this initial inflammatory response. Experimentally, L. major WT, L. major GP63 KO or L. major GP63 rescue were intraperitoneally inoculated in mice and inflammatory cells recruited were characterized microscopically and by flow cytometry (number and cell type), and their infection determined. Pro-inflammatory markers such as cytokines, chemokines and extracellular vesicles (EVs, e.g. exosomes) were monitored and proteomic analysis was performed on exosome contents. Data obtained from this study suggest that Leishmania GP63 does not significantly influence the pathogen-induced inflammatory cell recruitment, but rather their activation status and effector function. Concordantly, internalization of promastigotes during early infection could be influenced by GP63 as less L. major KO amastigotes were found within host cells and appear to maintain in host cells over time. Collectively this study provides a clear analysis of innate inflammatory events occurring during L. major infection and further establish the prominent role of the virulence factor GP63 to provide favorable conditions for host cell infection.

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Project description:Autophagy generally participates in innate immunity by elimination of intracellular pathogens. However, many of them developed successful strategies to counteract their autolysosomal digestion and lastly to exploit this catabolic cellular process. Protozoan parasites of the genus Leishmania are the causative agent of leishmaniasis, one of the 13 most important tropical diseases. Leishmania persists as endo-parasite in host macrophages, where it uses multiple strategies to manipulate the microbicidal host cell functions and to escape from the host immune system. Understanding how Leishmania interacts with host macrophages during uptake, differentiation, intracellular replication, and release might be the key to develop new drugs in target-directed approaches to treat patient with leishmaniasis. Here, we generated expression profiles from bone marrow-derived macrophages (BMDM) at 1h and 24h post infection (p.i.) with Leishmania major and respective controls.

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