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A block in degradation of MHC class II-associated invariant chain correlates with a reduction in transport from endosome carrier vesicles to the prelysosome compartment

Zachgo, Sabine and Dobberstein, Bernhard and Griffiths, Gareth

In: Journal of Cell Science, 103 (1992), pp. 811-822.

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Abstract

Invariant chain (Ii) associated with MHC class II molecule is processed proteolytically via several distinct intermediates during its intracellular transport through endosomal compartments. Leupeptin added to the culture medium blocks processing of Ii, prevents its dissociation from the class II molecules and leads to an intracellular accumulation of a 22 kDa intermediate form of Ii. We show here that leupeptin has a very general effect on protein transport in the endocytic pathway. When added to Mel Juso cells leupeptin reduces the transport of endocytosed material from multivesicular body-like, endosome carrier vesicles (ECV) to the prelysosomal compartment (late endosome) and leads to a concomitant increase in the number of ECV. Our results argue that one effect of leupeptin, related to antigen processing and presentation, is to block transport of antigen and/or MHC class II molecules to prelysosomal compartments.

Item Type: Article
Journal or Publication Title: Journal of Cell Science
Volume: 103
Date Deposited: 15. Jul 2008 17:23
Date: 1992
Page Range: pp. 811-822
Faculties / Institutes: Service facilities > Center for Molecular Biology Heidelberg
Subjects: 570 Life sciences
Uncontrolled Keywords: leupeptin , invariant chain (Ii) , endosome carrier vesicle (ECV) , endocytosis
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