1887

Abstract

The expression of major histocompatibility complex class I (MHC-I) molecules at the cell surface was down-regulated in BC-3 cells infected with Kaposi’s sarcoma-associated herpesvirus (KSHV)/human herpesvirus-8 at early times after treatment with 12--tetradecanoylphorbol acetate (TPA), and in HeLa cells transfected with the K5 gene of KSHV. However, an immunoprecipitation study on these cells with anti-MHC-I monoclonal antibody revealed that there was no significant reduction in the synthesis of MHC-I molecules. A pulse–chase analysis followed by endoglycosidase H digestion also demonstrated the stability and transport of MHC-I molecules from the endoplasmic reticulum to at least the medial-Golgi. K5 antigen was clearly detected by immunohistological examination of samples from Kaposi’s sarcoma, primary effusion lymphoma and Castleman’s disease. These results suggest that the down-regulation of MHC-I molecules by K5 gene expression during reactivation may be important for evading immunological surveillance in the host.

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2001-05-01
2021-10-24
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