Lutzomyia longipalpissaliva induces heme oxygenase-1 expression at bite sites

Nivea F. Luz, Thiago DeSouza-Vieira, Waldione De Castro, Aislan Carvalho Vivarini, Lais Pereira, Riam Rocha França, Paulo S. Silveira-Mattos, Diego L. Costa, Clarissa Teixeira, Claudio Meneses, Viviane S. Boaventura, Camila I. De Oliveira, Ulisses Gazos Lopes, Naomi Aronson, Bruno B. Andrade, Claudia I. Brodskyn, Jesus G. Valenzuela, Shaden Kamhawi, Valeria M. Borges*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Sand flies bite mammalian hosts to obtain a blood meal, driving changes in the host inflammatory response that support the establishment of Leishmania infection. This effect is partially attributed to components of sand fly saliva, which are able to recruit and activate leukocytes. Our group has shown that heme oxygenase-1 (HO-1) favors Leishmania survival in infected cells by reducing inflammatory responses. Here, we show that exposure to sand fly bites is associated with induction of HO-1 in vivo. Histopathological analyses of skin specimens from human volunteers experimentally exposed to sand fly bites revealed that HO-1 and Nrf2 are produced at bite sites in the skin. These results were recapitulated in mice ears injected with a salivary gland sonicate (SGS) or exposed to sand fly bites, indicating that vector saliva may be a key factor in triggering HO-1 expression. Resident skin macrophages were the main source HO-1 at 24-48 h after bites. Additionally, assays in vivo after bites and in vitro after stimulation with saliva both demonstrated that HO-1 production by macrophages was Nrf2-dependent. Collectively, our data demonstrates that vector saliva induces early HO-1 production at the bite sites, representing a major event associated with establishment of naturally-transmitted Leishmania infections.

Original languageEnglish
Article number2779
JournalFrontiers in Immunology
Volume9
Issue numberNOV
DOIs
StatePublished - 28 Nov 2018
Externally publishedYes

Keywords

  • Lutzomyia longipalpis
  • Nrf2
  • heme oxygenase-1
  • macrophages
  • saliva
  • sand fly bite
  • skin

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