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. 1994 Sep 1;302(Pt 2):581–586. doi: 10.1042/bj3020581

Distinctive inhibition of the lysosomal targeting of lysozyme and cathepsin D by drugs affecting pH gradients and protein kinase C.

J Radons 1, U Biewusch 1, S Grässel 1, H J Geuze 1, A Hasilik 1
PMCID: PMC1137267  PMID: 8093011

Abstract

Morphological and biochemical evidence indicates that in several cell types, lysozyme is found in both lysosomes and the medium. Here we report that in calcitriol-treated human promonocytes U937, in which approx. two-thirds of the synthesized lysozyme is secreted, most of the intracellular lysozyme co-localizes with cathepsin D in lysosomal organelles. In the presence of NH4Cl the lysosomal targeting of procathepsin D, but not that of lysozyme, is inhibited. In the presence of 4 beta-phorbol 12-myristate 13-acetate (4 beta-PMA; 'TPA'), the lysosomal packaging of lysozyme is almost completely inhibited, while that of procathepsin D is only partially so. However, the inhibition of the lysosomal targeting of procathepsin D by NH4Cl and 4 beta-PMA is additive. The targeting of lysozyme is partially inhibited in the presence of R-59022, an inhibitor of diacylglycerol kinase, whereas it is not affected by 4 alpha-phorbol 12-myristate 13-acetate, an isomer of 4 beta-PMA that does not activate protein kinase C. It is concluded that in U937 cells both carbohydrate-dependent and -independent recognition contributes to the lysosomal targeting of soluble proteins. We suggest that the carbohydrate-independent traffic of proteins to lysosomal compartments is controlled by a signalling pathway involving protein kinase C.

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