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Glycosaminoglycans Contribute To Skeletal Abnormalities In Patients With Lysosomal Storage Diseases

Date:
October 22, 2009
Source:
American Journal of Pathology
Summary:
Researchers have demonstrated that glycosaminoglycans (GAGs) contribute to skeletal abnormalities in patients with lysosomal storage diseases.
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A group led by Dr. Dieter Brömme at the University of British Columbia has demonstrated that glycosaminoglycans (GAGs) contribute to skeletal abnormalities in patients with lysosomal storage diseases.

Their report can be found in the November 2009 issue of The American Journal of Pathology.

Mucopolysaccharidoses (MPS) are a group of diseases in which the dysfunction of a lysosomal enzyme results in decreased breakdown of GAGs, a type of carbohydrate, in various tissues. These GAGs then collect in cells, causing severe cellular damage that affects bone, skeletal structure, connective tissue, and organs.

In cells that break down bone, GAGs have been shown to inhibit the function of cathepsin K, an enzyme that breaks down collagen, which leads to insufficient space for new bone formation. As MPS patients have severe deficiencies in bone growth and development, Wilson et al hypothesized that cathepsin K inhibition may contribute to bone pathology in MPS patients. They found that both GAGs and cathepsin K were expressed in bone growth regions of a mouse model of MPS type I and that higher levels of cartilage accumulated in bone growth regions of MPS I mice than in their wild-type counterparts. In addition, cathepsin K-mediated collagen degradation was significantly reduced in bone-resorbing cells from MPS I mice.

Taken together, the data by Dr. Brömme and colleagues suggest that "the decrease in the collagenolytic activity of cathepsin K due to the expression of GAGs will greatly reduce osteoclast function and will thus likely contribute to the skeletal abnormalities observed in MPS I bone."


Story Source:

The above post is reprinted from materials provided by American Journal of Pathology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Wilson S, Hashamiyan S, Clarke L, Saftig P, Mort J, Dejica VM, Brömme D. Glycosaminoglycan-Mediated Loss of Cathepsin K Collagenolytic Activity in MPS I Contributes to Osteoclast and Growth Plate Abnormalities. American Journal Of Pathology, 2009; DOI: 10.2353/ajpath.2009.090211

Cite This Page:

American Journal of Pathology. "Glycosaminoglycans Contribute To Skeletal Abnormalities In Patients With Lysosomal Storage Diseases." ScienceDaily. ScienceDaily, 22 October 2009. <www.sciencedaily.com/releases/2009/10/091022071135.htm>.
American Journal of Pathology. (2009, October 22). Glycosaminoglycans Contribute To Skeletal Abnormalities In Patients With Lysosomal Storage Diseases. ScienceDaily. Retrieved July 6, 2015 from www.sciencedaily.com/releases/2009/10/091022071135.htm
American Journal of Pathology. "Glycosaminoglycans Contribute To Skeletal Abnormalities In Patients With Lysosomal Storage Diseases." ScienceDaily. www.sciencedaily.com/releases/2009/10/091022071135.htm (accessed July 6, 2015).

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