Cited by 48Research on Leishmaniasis StudiesCellular transport and secretionLeprosy Research and Treatment

Leishmania Promastigotes Induce Cytokine Secretion in Macrophages through the Degradation of Synaptotagmin XI

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Arango Duque, Guillermo, Fukuda, Mitsunori, Turco, Salvatore J, Stäger, Simona, Descoteaux, Albert·2014·The Journal of Immunology

Abstract

Synaptotagmins (Syts) are type-I membrane proteins that regulate vesicle docking and fusion in processes such as exocytosis and phagocytosis. We recently discovered that Syt XI is a recycling endosome- and lysosome-associated protein that negatively regulates the secretion of TNF and IL-6. In this study, we show that Syt XI is directly degraded by the zinc metalloprotease GP63 and excluded from Leishmania parasitophorous vacuoles by the promastigotes surface glycolipid lipophosphoglycan. Infected macrophages were found to release TNF and IL-6 in a GP63-dependent manner. To demonstrate that cytokine release was dependent on GP63-mediated degradation of Syt XI, small interfering RNA-mediated knockdown of Syt XI before infection revealed that the effects of small interfering RNA knockdown and GP63 degradation were not cumulative. In mice, i.p. injection of GP63-expressing parasites led to an increase in TNF and IL-6 secretion and to an augmented influx of neutrophils and inflammatory monocytes to the inoculation site. Both of these cell types have been shown to be infection targets and aid in the establishment of infection. In sum, our data revealed that GP63 induces proinflammatory cytokine release and increases infiltration of inflammatory phagocytes. This study provides new insight on how Leishmania exploits the immune response to establish infection.

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Crossref · 10.4049/jimmunol.1303043

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  • Syt XI associates to recycling endosomes and lysosomes in macrophages.

    “One such regulator is the recently characterized protein Syt XI, which associates to recycling endosomes and lysosomes in macrophages (11, 22).”
  • Infection of macrophages with GP63+/+ or GP63−/− parasites revealed that Syt XI is degraded by GP63, leading to the release of TNF and IL-6.

    “Infection of macrophages with GP63+/+ or GP63−/− parasites revealed that Syt XI is degraded by GP63, leading to the release of TNF and IL-6.”
  • Intraperitoneal injection of GP63-expressing promastigotes induces TNF and IL-6 release 4 h after inoculation.

    “To highlight the relevance of these findings in an in vivo setting, it was demonstrated that intraperitoneal injection of GP63-expressing promastigotes induces TNF and IL-6 release 4 h after inoculation.”
  • Cytokine release by infected macrophages positively correlated with the GP63 content of different Leishmania species.

    “Moreover, cytokine release by infected macrophages positively correlated with the GP63 content of different Leishmania species.”
  • GP63 promotes the infiltration of neutrophils and inflammatory monocytes early during infection.

    “Interestingly, it was observed that GP63 also promotes the infiltration of neutrophils and inflammatory monocytes early during infection.”

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Authors
Arango Duque, G., Fukuda, M., Turco, S. J., Stäger, S., & Descoteaux, A.
Affiliations
  • Institut National de la Recherche Scientifique–Institut Armand-Frappier , Laval, Quebec H7V 1B7 ,
  • Tohoku University (JP)
  • University of Kentucky (US)
  • Institut National de la Recherche Scientifique (CA)
Corresponding author
Descoteaux, Albert
Venue
The Journal of Immunology
Published
2014-09-01
Volume
193
Issue
5
Pages
2363-2372
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2130082930
Cited by
48
References
65
Citations by year
2026: 1 · 2025: 5 · 2024: 2 · 2023: 1 · 2022: 5 · 2021: 7 · 2020: 1 · 2019: 5 · 2018: 3 · 2017: 3 · 2016: 9 · 2015: 4 · 2014: 2
FWCI
5.97
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • EspaceINRS (National Institute for Scientific Research (Canada)) (acceptedVersion)
  • HAL (submittedVersion, cc-by)
  • HAL (submittedVersion)
Funders
Canadian Institutes of Health Research (125990_1, 123293_1)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Research on Leishmaniasis Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Infectious Diseases › Leprosy Research and Treatment
Keywords
Leishmania promastigotes, gp63, zinc metalloprotease, macrophages, cytokine production, TNF-α, interleukin-6, lipophosphoglycan, parasitophorous vacuole, vesicle fusion, inflammatory monocytes, neutrophils, host-parasite interactions, leishmaniasis
MeSH terms
Animals, Cell Line, Female, Cricetinae, Leishmania, Leishmaniasis, Metalloendopeptidases, Mice, Inbred BALB C, Monocytes, Tumor Necrosis Factor-alpha, Interleukin-6, Macrophages, Peritoneal, Synaptotagmins, Mice

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