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Journal Article
Research Support, Non-U.S. Gov't
Pathological features of glycogen storage disease type II highlighted in the knockout mouse model.
Journal of Pathology 1999 November
Glycogen storage disease type II (GSDII; Pompe's disease) is an autosomal recessive disease caused by lysosomal alpha-glucosidase deficiency. Skeletal muscle weakness is the most conspicuous clinical symptom of patients suffering from GSDII and skeletal muscle also is prominently involved in the knockout mouse model of this disease. Thus far, however, little detailed information has been published on the pathological changes in other mouse tissues. This paper aims to provide these data and gives a record of the clinical course of the mouse model over a 2-year period. Four-month-old affected mice perform worse in a running wheel than their unaffected littermates, but do not yet display other clear signs of disease. The lysosomal glycogen storage, already evident at birth, becomes more severe in time, leading to muscle wasting by 9-10 months of age and then limb girdle weakness and kyphosis. The disease does not markedly shorten the animal's life span despite the serious tissue pathology, which is not limited to heart and skeletal muscle, but is also seen in the smooth muscle of blood vessels and of the respiratory, digestive, and urogenital tracts. In addition, the mice have lysosomal glycogen storage in the liver, kidney, spleen, and salivary gland; in Schwann cells of the peripheral nerves, and in a subset of neurons in the central nervous system. By pathological criteria, the knockout mouse model parallels the human infantile form of GSDII and is attractive for studying the possible reversal of tissue pathology and symptomatology under different therapeutic regimes.
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