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Cystatin F is secreted, but artificial modification of its C-terminus can induce its endocytic targeting.

Abstract：

:Cystatins constitute a superfamily of cysteine protease inhibitors. A member of the type II secreted cystatin family, cystatin F, has been identified through different gene array experiments to be specifically expressed in hematopoietic cells as well as to be associated with several malignant tumors, suggesting a role in immunity or cancer progression. Cystatin F specificity as a protease inhibitor is still elusive, and understanding the cellular traffic of this molecule is therefore a major step in its characterization. Although the mannosylation-6 phosphate of cystatin F has been suggested, no conclusive evidences of its endosomal targeting have been reported. Here we show using U937 cells that cystatin F is secreted as a disulfide bridge-linked dimer and is not associated with endosomes intracellularly. Interestingly, although cystatin F targeting to endosomes or lysosomes is not observed in U937, modification of its C-terminal end by the addition of several amino acids promotes its accumulation in the lysosomes of transfected HeLa cells. This observation suggests that cystatin F can be targeted to the endocytic pathway under specific conditions and its C-terminal domain might contribute to this event.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Cappello F,Gatti E,Camossetto V,David A,Lelouard H,Pierre P

doi

10.1016/j.yexcr.2004.03.048

keywords:

subject

Has Abstract

pub_date

2004-07-15 00:00:00

pages

607-18

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014482704001879

journal_volume

297

pub_type

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