Jan 1, 1976

Arylsulfatases A and B in metachromatic leukodystrophy and Maroteaux-Lamy syndrome: studies with 4-methylumelliferyl sulfate

Advances in Experimental Medicine and Biology
E H Kolodny, R A Mumford


Metachromatic leukodystrophy and Maroteaux-Lamy syndrome can be diagnosed by assay of leukocyte or fibroblast arylsulfatase A and B activity with the fluorogenic substrate 4-methylumbelliferyl sulfate. The arylsulfatases are extracted into a 27000 x g supernatant by sonication in 0.9% sodium chloride and then separated with CM-32 on columns or in test tubes. In 0.05 M sodium acetate pH 6.0, arylsulfatase A is not absorbed while arylsulfatase B is retained by the resin. The arylsulfatase B is then eluted from the resin with 0.3 M sodium chloride. The arylsulfatase A activity obtained from normal leukocytes and fibroblasts is linear for the initial 10 minutes of the reaction, is stimulated 3-fold by 6 mM lead acetate and inhibited 80% by 0.24 mM silver nitrate. After separation with CM-32, the arylsulfatase B activity is stimulated 3-fold by Triton X-100 (0.1%). Arylsulfatase A but not arylsulfatase B is destroyed by heat (60 degrees). Both leukocyte and fibroblast arylsulfatase A activity was reduced to 11% of control values in metachromatic leukodystrophy. Essentially no arylsulfatase B activity was detected in cells from patients with Maroteaux-Lamy syndrome. Metachromatic leukodystrophy heterozygotes but not Maroteaux-Lamy sy...Continue Reading

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Mentioned in this Paper

ARSB gene
Specimen Type - Fibroblasts
4-methylumbelliferyl sulfate
Leukodystrophy, Metachromatic
Enzymes, antithrombotic
Argentum nitricum, silver nitrate
Mucopolysaccharidosis VI
White Blood Cell Count Procedure
Arylsulfatase A Deficiency

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