Cathepsin K Deficiency in Pycnodysostosis Results in Accumulation of Non-Digested Phagocytosed Collagen in Fibroblasts View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2003-10

AUTHORS

V. Everts, W. S. Hou, X. Rialland, W. Tigchelaar, P. Saftig, D. Brömme, B. D. Gelb, W. Beertsen

ABSTRACT

The rare osteosclerotic disease, pycnodysostosis, is characterized by decreased osteoclastic bone collagen degradation due to the absence of active cathepsin K. Although this enzyme is primarily expressed by osteoclasts, there is increasing evidence that it may also be present in other cells, including fibroblasts. Since fibroblasts are known to degrade collagen intracellularly following phagocytosis, we analyzed various soft connective tissues (periosteum, perichondrium, tendon, and synovial membrane) from a 13-week-old human fetus with pycnodysostosis for changes in this collagen digestion pathway. In addition, the same tissues from cathepsin K-deficient and control mice were analyzed. Microscopic examination of the human fetal tissues showed that cross-banded collagen fibrils had accumulated in lysosomal vacuoles of fibroblasts. Morphometric analysis of periosteal fibroblasts revealed that the volume density of collagen-containing vacuoles was 18 times higher than in fibroblasts of control patients. A similar accumulation was seen in periosteal fibroblasts of three children with pycnodysostosis. In contrast to the findings in humans, an accumulation of internalized collagen was not apparent in fibroblasts of mice with cathepsin K deficiency. Our observations indicate that the intracellular digestion of phagocytosed collagen by fibroblasts is inhibited in humans with pycnodysostosis, but probably not in the mouse model mimicking this disease. The data strongly suggest that cathepsin K is a crucial protease for this process in human fibroblasts. Murine fibroblasts may have other proteolytic activities that are expressed constitutively or up regulated in response to a deficiency of cathepsin K. This may explain why cathepsin K-deficient mice lack the dysostotic features that are prominent in patients with pycnodysostosis. More... »

PAGES

380-386

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00223-002-2092-4

DOI

http://dx.doi.org/10.1007/s00223-002-2092-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037918418

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12874701


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