title: Lysosomal leukocyte beta-D-glucuronidase during enzyme replacement therapy in Fabry disease.
abstract: OBJECTIVE
  Fabry disease results from a deficiency in the activity of alpha-d-galactosidase A and subsequent accumulation of neutral glycosphingolipids in lysosomes. This study investigated whether lysosomal enzymes can indicate biochemical changes in the lysosomal apparatus induced by enzyme replacement therapy (ERT).
  
  
  METHODS
  Eight patients were monitored by clinical and biochemical tests and several lysosomal glycohydrolases were measured in plasma and leucocytes.
  
  
  RESULTS
  Before starting ERT, beta-d-glucuronidase in leukocytes was markedly increased. After 1 month of therapy, enzyme levels dropped in all patients. In the patients who regularly followed the therapy, the enzyme levels remained stable for the next 20 months. In one patient who interrupted therapy for 2 months, the enzyme levels rose again.
  
  
  CONCLUSIONS
  Lysosomal enzymes can be useful for monitoring biochemical changes in patients with Fabry disease receiving ERT. Though these findings refer to only a small number of patients, the correlation between beta-d-glucuronidase levels and ERT is interesting and might serve as a basis for further studies to define the potential of this enzyme in monitoring the effects of ERT in lysosomal storage disorders.
authors.affiliation: Department of Medical Chemistry, Biochemistry and Biotechnology, University of Milan, Via Saldini, 50, 20133 Milan, Italy. giancarlo.goi@inimi.it
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Goi
authors.forename: Luca
authors.initials: L
authors.lastname: Massaccesi
authors.forename: Alessandro P
authors.initials: AP
authors.lastname: Burlina
authors.forename: Claudia J
authors.initials: CJ
authors.lastname: Baquero Herrera
authors.forename: Adriana
authors.initials: A
authors.lastname: Lombardo
authors.forename: Guido
authors.initials: G
authors.lastname: Tettamanti
authors.forename: Alberto B
authors.initials: AB
authors.lastname: Burlina
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003592:Cytophotometry; D000795:Fabry Disease / Q000188:drug therapy / Q000201:enzymology*; D005260:Female; D005966:Glucuronidase / Q000378:metabolism*; D006026:Glycoside Hydrolases / Q000097:blood; D006801:Humans; D007962:Leukocytes / Q000201:enzymology*; D008247:Lysosomes / Q000201:enzymology*; D008297:Male; D008875:Middle Aged; D000519:alpha-Galactosidase / Q000627:therapeutic use
chemical_list: D006026:Glycoside Hydrolases; D000519:alpha-Galactosidase; D005966:Glucuronidase