home *** CD-ROM | disk | FTP | other *** search
- Document 0536
- DOCN M9620536
- TI Processing of exogenous heat-aggregated (denatured) and particulate
- (native) hepatitis B surface antigen for class I-restricted epitope
- presentation.
- DT 9602
- AU Schirmbeck R; Bohm W; Melber K; Reimann J; Institute for Medical
- Microbiology, University of Ulm, Germany.
- SO J Immunol. 1995 Nov 15;155(10):4676-84. Unique Identifier : AIDSLINE
- MED/96062283
- AB Many cell types efficiently present an epitope of the hepatitis B
- surface Ag (HBsAg) to murine class I-restricted CTL following an in
- vitro pulse with native 22-nm HBsAg particles. Processing of exogenous
- HBsAg particles required its cytochalasin B-insensitive uptake and acid
- proteolysis in an endocytic compartment, was insensitive to brefeldin A
- and cycloheximide, and did not involve regurgitation of antigenic
- peptides. In contrast, after an in vitro pulse of cells with exogenous,
- heat-denatured 1-micron HBsAg aggregates, only macrophages (but not
- other cell types tested) presented the Ld-restricted HBsAg epitope
- efficiently to CTL. Processing of exogenous HBsAg aggregates required
- its cytochalasin B-sensitive uptake, was insensitive to brefeldin A, and
- involved regurgitation of antigenic peptides. Processing of the two
- different, exogenous HBsAg preparations for class I-restricted epitope
- presentation thus involved alternative pathways: an endocytic pathway
- for native 22-nm particles, and a phagocytic pathway for denatured
- 1-microns aggregates. Both HBsAg preparations displayed different
- immunogenicity for class I-restricted CTL in vivo when delivered without
- adjuvants: native HBsAg particles were of high immunogenicity, and
- denatured HBsAg aggregates were of low immunogenicity. Class
- I-restricted CTL are thus primed in vivo after endocytic processing of
- native HBsAg particles as well as phagocytic processing of denatured
- HBsAg aggregates.
- DE Animal *Antigen Presentation Cells, Cultured CD8-Positive
- T-Lymphocytes/*IMMUNOLOGY Endocytosis/IMMUNOLOGY Heat Hepatitis B
- Antigens/CHEMISTRY/*IMMUNOLOGY Histocompatibility Antigens Class
- I/*IMMUNOLOGY Mice Mice, Inbred BALB C Phagocytosis/IMMUNOLOGY
- Recombinant Proteins/CHEMISTRY/IMMUNOLOGY Support, Non-U.S. Gov't
- JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-