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Ex vivo and in vivo effects of isofagomine on acid β-glucosidase variants and substrate levels in Gaucher disease.

Abstract
Isofagomine (IFG) is an acid β-glucosidase (GCase) active site inhibitor that acts as a pharmacological chaperone. The effect of IFG on GCase function was investigated in GCase mutant fibroblasts and mouse models. IFG inhibits GCase with K(i) ∼30 nM for wild-type and mutant enzymes (N370S and V394L). Fibroblasts treated with IFG at μM concentrations showed enhancement of WT and mutant GCase activities and protein levels. Administration of IFG (30 mg/kg/day) to the mice homozygous for GCase mutations (V394L, D409H, or D409V) led to increased GCase activity in visceral tissues and brain extracts. IFG effects on GCase stability and substrate levels were evaluated in a mouse model (hG/4L/PS-NA) that has doxycycline-controlled human WT GCase (hGCase) expression driven by a liver-specific promoter and is also homozygous for the IFG-responsive V394L GCase. Both human and mouse GCase activity and protein levels were increased in IFG-treated mice. The liver-secreted hGCase in serum was stabilized, and its effect on the lung and spleen involvement was enhanced by IFG treatment. In 8-week IFG-treated mice, the accumulated glucosylceramide and glucosylsphingosine were reduced by 75 and 33%, respectively. Decreases of storage cells were correlated with >50% reductions in substrate levels. These results indicate that IFG stabilizes GCase in tissues and serum and can reduce visceral substrates in vivo.
AuthorsYing Sun, Benjamin Liou, You-Hai Xu, Brian Quinn, Wujuan Zhang, Rick Hamler, Kenneth D R Setchell, Gregory A Grabowski
JournalThe Journal of biological chemistry (J Biol Chem) Vol. 287 Issue 6 Pg. 4275-87 (Feb 03 2012) ISSN: 1083-351X [Electronic] United States
PMID22167193 (Publication Type: Journal Article)
Chemical References
  • Glucosylceramides
  • Imino Pyranoses
  • isofagomine
  • Psychosine
  • sphingosyl beta-glucoside
  • Glucosylceramidase
Topics
  • Amino Acid Substitution
  • Animals
  • Catalytic Domain
  • Cells, Cultured
  • Enzyme Stability (drug effects, genetics)
  • Gaucher Disease (drug therapy, enzymology, genetics)
  • Gene Expression Regulation, Enzymologic (drug effects)
  • Glucosylceramidase (antagonists & inhibitors, genetics, metabolism)
  • Glucosylceramides (genetics, metabolism)
  • Humans
  • Imino Pyranoses (pharmacology)
  • Mice
  • Mutation, Missense
  • Organ Specificity (drug effects, genetics)
  • Psychosine (analogs & derivatives, genetics, metabolism)

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