MHC-E–restricted CD8+ T cells target Hepatitis B virus–infected human hepatocytes

BJ Burwitz, PK Hashiguchi, M Mansouri… - The Journal of …, 2020 - journals.aai.org
BJ Burwitz, PK Hashiguchi, M Mansouri, C Meyer, RM Gilbride, S Biswas, JL Womack…
The Journal of Immunology, 2020journals.aai.org
Currently 247 million people are living with chronic hepatitis B virus infection (CHB), and the
development of novel curative treatments is urgently needed. Immunotherapy is an attractive
approach to treat CHB, yet therapeutic approaches to augment the endogenous hepatitis B
virus (HBV)–specific T cell response in CHB patients have demonstrated little success. In
this study, we show that strain 68-1 rhesus macaque (RM) CMV vaccine vectors expressing
HBV Ags engender HBV-specific CD8+ T cells unconventionally restricted by MHC class II …
Abstract
Currently 247 million people are living with chronic hepatitis B virus infection (CHB), and the development of novel curative treatments is urgently needed. Immunotherapy is an attractive approach to treat CHB, yet therapeutic approaches to augment the endogenous hepatitis B virus (HBV)–specific T cell response in CHB patients have demonstrated little success. In this study, we show that strain 68-1 rhesus macaque (RM) CMV vaccine vectors expressing HBV Ags engender HBV-specific CD8+ T cells unconventionally restricted by MHC class II and the nonclassical MHC-E molecule in RM. Surface staining of human donor and RM primary hepatocytes (PH) ex vivo revealed the majority of PH expressed MHC-E but not MHC class II. HBV-specific, MHC-E–restricted CD8+ T cells from RM vaccinated with RM CMV vaccine vectors expressing HBV Ags recognized HBV-infected PH from both human donor and RM. These results provide proof-of-concept that MHC-E–restricted CD8+ T cells could be harnessed for the treatment of CHB, either through therapeutic vaccination or adoptive immunotherapy.
journals.aai.org