Implication of CpG-ODN and reactive oxygen species in the inhibition of intracellular growth of Salmonella typhimurium in hepatocytes

Microbes and Infection
María Sanchez-CampilloPilar García-Peñarrubia

Abstract

Bacterial DNA acts as an alert signal for eukaryotic cells through immunostimulatory CpG motifs. These sequences have therapeutic properties promoting protective immune TH1 responses and are recognized by a membrane protein belonging to the Toll-like receptor (TLR) family, named TLR-9. The aim of this study was to test the capability of murine hepatocytes to sense bacterial DNA and to develop antibacterial mechanisms against Salmonella typhimurium. We show that hepatocyte cell lines and mRNA extracts from murine liver constitutively express TLR-9, which is down-regulated by LPS and the mix of IFNgamma, IL-1beta and LPS. Also, we have found that hepatocyte cell lines can sense the presence of bacterial DNA and respond to it by increasing the pool of intracellular peroxides. This results in inhibition of intracellular growth of S. typhimurium when infected cells were incubated in the presence of CpG synthetic oligonucleotides (CpG-ODN). Expression of hepatocyte Mn-SOD is also induced by stimulation with CpG-oligodeoxynucleotides, LPS, and the mix of IFNgamma, IL-1beta and LPS. These results reinforce the prominent role of hepatocytes as a microbial product-responsive cell and the capabilities of CpG-ODN sequences as potent induce...Continue Reading

Citations

Apr 29, 2015·Developmental and Comparative Immunology·Mingzhe SunLinsheng Song
Aug 22, 2006·Autoimmunity Reviews·Yuki MoritokiM Eric Gershwin
Aug 19, 2006·European Journal of Immunology·Masanori AbeAngus W Thomson
May 29, 2008·Hepatology : Official Journal of the American Association for the Study of Liver Diseases·Ekihiro Seki, David A Brenner
Nov 17, 2009·Cellular Microbiology·Peter LiehlMaria M Mota
Jul 28, 2010·The Journal of Immunology : Official Journal of the American Association of Immunologists·Vicky L MorrisonDavid Gray
Aug 4, 2020·World Journal of Transplantation·Mahmoud El-BendaryMohamed Abdel-Wahab
Oct 12, 2010·Journal of Agricultural and Food Chemistry·María Sánchez-CampilloElvira Larqué

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