title: Enzyme replacement with PEGylated cystathionine β-synthase ameliorates homocystinuria in murine model.
abstract: Homocystinuria, which typically results from cystathionine β-synthase (CBS) deficiency, is the most common defect of sulfur amino acid metabolism. CBS condenses homocysteine and serine to cystathionine that is then converted to cysteine. Individuals with homocystinuria have markedly elevated plasma levels of homocysteine and methionine and reduced concentrations of cystathionine and cysteine. Clinical disease manifestations include thromboembolism and neuropsychiatric, ocular, and skeletal complications. Here, we have shown that administration of PEGylated CBS into the circulation of homocystinuria model mice alters the extra- and intracellular equilibrium of sulfur amino acids, resulting in a decrease of approximately 75% in plasma total homocysteine (tHcy) and normalization of cysteine concentrations. Moreover, the decrease in homocysteine and the normalization of cysteine in PEGylated CBS-treated model mice were accompanied by improvement of histopathological liver symptoms and increased survival. Together, these data suggest that CBS enzyme replacement therapy (ERT) is a promising approach for the treatment of homocystinuria and that ERT for metabolic diseases may not necessitate introduction of the deficient enzyme into its natural intracellular compartment.
authors.forename: Erez M
authors.initials: EM
authors.lastname: Bublil
authors.forename: Tomas
authors.initials: T
authors.lastname: Majtan
authors.forename: Insun
authors.initials: I
authors.lastname: Park
authors.forename: Richard S
authors.initials: RS
authors.lastname: Carrillo
authors.forename: Helena
authors.initials: H
authors.lastname: Hůlková
authors.forename: Jakub
authors.initials: J
authors.lastname: Krijt
authors.forename: Viktor
authors.initials: V
authors.lastname: Kožich
authors.forename: Jan P
authors.initials: JP
authors.lastname: Kraus
mesh_terms: D000818:Animals; D003541:Cystathionine beta-Synthase / Q000172:deficiency* / Q000235:genetics / Q000627:therapeutic use*; D004195:Disease Models, Animal; D006712:Homocystinuria / Q000188:drug therapy* / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D008099:Liver / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D011092:Polyethylene Glycols; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000627:therapeutic use
chemical_list: D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D003541:Cystathionine beta-Synthase