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The Journal of Immunology, Vol 154, Issue 11 6122-6131, Copyright © 1995 by American Association of Immunologists
ARTICLES |
K Baetz, S Isaaz and GM Griffiths
Basel Institute for Immunology, Switzerland.
CTLs from patients with Chediak-Higashi syndrome (CHS) are unable to destroy target cells recognized via the TCR. To determine the mechanism responsible for the loss of cytotoxicity, CD8+ CTL clones have been derived from a patient with CHS. Individual CTL clones show poor killing that can be increased in longer assays. However, in the presence of cycloheximide, the small amount of killing observed is abolished, indicating killing arises from newly synthesized proteins, rather than from proteins stored in granules. In this study, we show that the CHS CTL clones express normal levels of the lytic proteins granzyme A, granzyme B, and perforin, which are processed properly during biosynthesis and targeted correctly to giant lytic granules. Despite the difference in size, CHS and normal lytic granules are similar, in that both contain the lysosomal enzyme cathepsin D and the lytic protein granzyme A, and lack the mannose-6-phosphate receptor (MPR). However, unlike normal CTL clones, the CHS CTL clones are unable to secrete their giant granules in which the lytic proteins are stored. After cross-linking the TCR, CHS CTL clones fail to secrete granzyme A, as assayed by both enzyme release and confocal microscopy. We suggest that the defect in CHS lies in a protein that is involved in membrane fusion and is essential for the secretion of lysosomal compartments in certain hemopoietic cells.
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