PMID: 6412235Oct 1, 1983Paper

A canine model of human alpha-L-iduronidase deficiency

Proceedings of the National Academy of Sciences of the United States of America
E SpellacyE F Neufeld

Abstract

A disease discovered in three Plott Hound littermates was found to be associated with a profound and specific deficiency of alpha-L-iduronidase (mucopolysaccharide alpha-L-iduronohydrolase; EC 3.2.1.76) in fibroblasts and leukocytes. The pedigree was consistent with autosomal recessive inheritance. A markedly increased amount of dermatan sulfate and heparan sulfate was excreted in urine. Fibroblasts cultured from the skin of the affected dogs accumulated excessive 35S-labeled mucopolysaccharide; this accumulation could be decreased to a normal level by exogenous human high-uptake alpha-L-iduronidase (Hurler corrective factor) as well as by secretions of normal human or canine fibroblasts. The correction was inhibited by mannose 6-phosphate. Maturation of alpha-L-iduronidase in normal canine fibroblasts followed the pathway previously observed in human fibroblasts; no cross-reactive material was observed in the cells or in secretions from the fibroblasts of the affected dogs. The canine disorder thus resembles mucopolysaccharidosis I in all biochemical parameters tested; the clinical appearance of the animals is closest to Hurler-Scheie syndrome, a form of alpha-L-iduronidase deficiency of intermediate severity. The animal model...Continue Reading

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