Regulatory T cells control the CD8 adaptive immune response at the time of ductal obstruction in experimental biliary atresia.

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Celine S LagesAlexander G Miethke

Abstract

CD8 T-lymphocytes are effector cells of cholangiocyte injury in human and in rhesus rotavirus (RRV)-induced experimental biliary atresia (BA). Here we hypothesize that neonatal deficiency in CD25(+) CD4(+) regulatory T cells (Tregs) leads to aberrant activation of hepatic T-lymphocytes in BA. We found that adoptive transfer of total CD4 cells, but not of CD25-depleted CD4 cells, prior to RRV inoculation reduced expansion of CD8 cells, plasma bilirubin levels, ductal inflammation, and bile duct epithelial injury at 7 days postinfection (dpi) compared with age-matched infected controls without adoptive transfer. Searching for mechanisms, we found that in vitro production of interferon-gamma (IFN-γ) by naïve CD8 cells upon polyclonal stimulation was enhanced in coculture with hepatic dendritic cells (DCs) from RRV-infected, but not with DCs from noninfected mice, which was correlated with an increased proportion of CD11b(+) myeloid (m)DCs and up-regulation of the costimulatory molecule CD86 on RRV-primed DCs. Furthermore, DC-dependent T-lymphocyte activation was blocked by anti-CD86 antibody in dose-dependent fashion. Importantly, expression of CD86 on mDCs was down-regulated by Tregs in vitro, and adoptive transfer of Treg-contai...Continue Reading

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