TY  - JOUR
SP  - 811
TI  - 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
A1  - Zachgo, Sabine
A1  - Dobberstein, Bernhard
A1  - Griffiths, Gareth
KW  - leupeptin 
KW  -  invariant chain (Ii) 
KW  -  endosome carrier vesicle (ECV) 
KW  -  endocytosis
JF  - The Journal of Cell Science
ID  - heidok8553
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/8553/
Y1  - 1992///
EP  - 822
AV  - public
VL  - 103
N2  - 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.
ER  -