The Journal of Experimental Medicine
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Published online 14 August 2000.
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© The Rockefeller University Press, 0022-1007/2000/8/483/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 4, August 21, 2000 483-494


Original Article

Differential Influence on Cytotoxic T Lymphocyte Epitope Presentation by Controlled Expression of Either Proteasome Immunosubunits or PA28

Thorbald van Halla, Alice Sijtsb, Marcel Campsa, Rienk Offringaa, Cornelis Meliefa, Peter-M. Kloetzelb, and Ferry Ossendorpa
a Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, 2300 RC Leiden, The Netherlands
b Institute of Biochemistry, Charité, Humboldt University, 10117 Berlin, Germany

Correspondence to: Ferry Ossendorp, Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands. Tel:31-71-526-3843 Fax:31-71-521-6751 E-mail:ossendorp{at}mail.medfac.leidenuniv.nl.

The proteasome is the principal provider of major histocompatibility complex (MHC) class I–presented peptides. Interferon (IFN)-{gamma} induces expression of three catalytically active proteasome subunits (LMP2, LMP7, and MECL-1) and the proteasome-associated activator PA28. These molecules are thought to optimize the generation of MHC class I–presented peptides. However, known information on their contribution in vivo is very limited. Here, we examined the antigen processing of two murine leukemia virus-encoded cytotoxic T lymphocyte (CTL) epitopes in murine cell lines equipped with a tetracycline-controlled, IFN-{gamma}–independent expression system. We thus were able to segregate the role of the immunosubunits from the role of PA28. The presence of either immunosubunits or PA28 did not alter the presentation of a subdominant murine leukemia virus (MuLV)-derived CTL epitope. However, the presentation of the immunodominant MuLV-derived epitope was markedly enhanced upon induction of each of these two sets of genes. Thus, the IFN-{gamma}–inducible proteasome subunits and PA28 can independently enhance antigen presentation of some CTL epitopes. Our data show that tetracycline-regulated expression of PA28 increases CTL epitope generation without affecting the 20S proteasome composition or half-life. The differential effect of these IFN-{gamma}–inducible proteins on MHC class I processing may have a decisive influence on the quality of the CTL immune response.

Key Words: antigen processing, major histocompatibility complex class I, immunoproteasomes, PA28, murine leukemia virus


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