Dysregulation of JAK/STAT genes by vasoactive intestinal peptide (VIP) in Salmonella-infected monocytes may inhibit its therapeutic potential in human sepsis

Hiba Ibrahim, Basim Askar, Paul Barrow, Neil Foster*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Murine/LPS models of Gram negative sepsis indicate that vasoactive intestinal peptide (VIP) has therapeutic potential. We investigated the unknown effect of VIP on JAK/STAT proteins and genes in human monocytes infected with Salmonella Typhimurium 14028. S. Typhimurium 14028 increased expression of both IL-6 receptor (IL-6R) and interferon gamma receptor 1 (IFNγR1) on monocytes but co-culture of infected monocytes with VIP (10 −7 M) only decreased expression of IFNγR1 (P < 0.05). In contrast, S. Typhimurium 14028 infection or co-culture with VIP had no effect on IL-10 receptor expression on the monocyte surface. However, S. Typhimurium 14028 down regulated IFNGR1 gene expression and this was not altered by co-culture with VIP, suggesting that changes in IFNγR1 protein may be due to an effect on cytoplasmic transport. 15 JAK/STAT genes, out of 84 studied, were up-regulated by S. Typhimurium 14028 infection and five were down-regulated. Co-culture with VIP significantly decreased expression of two genes (IFNG and IL-20) and increased expression of three genes (SOCS1, SOCS3 and STAT4) (P < 0.05). S. Typhimurium 14028 also increased expression of PTPN1, which dephosphorylates JAK2 and TYK2. This was unaltered by co-culture with VIP but S. Typhimurium 14028-induced expression of ISG15, associated with susceptibility to Gram negative infection, was further increased by VIP. We conclude that the effect of VIP on JAK/STAT genes may preclude its therapeutic use in human Gram negative sepsis.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalCytokine
Volume105
Early online date16 Feb 2018
DOIs
Publication statusPrint publication - May 2018
Externally publishedYes

Keywords

  • IFN-γRα
  • JAK/STAT
  • Monocyte
  • Salmonella
  • VIP

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