Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

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Query: EC:3.1.6.1 (sulfatase)
3,205 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Economically viable biopharmaceutical production is to a high degree dependent on high product yields and stable fermentation systems that are easy to handle. In the current study we have compared two different fermentation systems for the production of recombinant protein from CHO cells. Both systems are fully scaleable and can be used for industrial high cell density bioprocesses. As a model cell line we have used a recombinant CHO cell line producing the enzyme arylsulfatase B (ASB). CHO cells were cultivated as adherent cell culture attached on Cytoline macroporous microcarrier (Amersham Biosciences, Sweden) using a Cytopilot Mini fluidized bed bioreactor (FBR, Vogelbusch-Amersham Biosciences, Austria) and as suspension culture using a stirred tank bioreactor equipped with a BioSep ultrasonic resonator based cell separation device (Applikon, The Netherlands). Both systems are equally well-suited for stable, long-term high cell density perfusion cell culture and provide industrial scalability and high yields. For products such as the recombinant ASB, high perfusion rates and therefore short product bioreactor residence times may be of additional benefit.
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PMID:Comparison of fluidized bed and ultrasonic cell-retention systems for high cell density mammalian cell culture. 1279 Jun 77

Mucopolysaccharidosis type VI (MPS VI) is a lysosomal storage disease caused by a deficiency of arylsulfatase B (ASB) which has its function in the sequential degradation of glycosaminoglycans (GAG). Targeted disruption of the ASB gene resulted in a mouse model of MPS VI that has been closely investigated for skeletal and chondral dysplasia. As ocular and cardiac impairment are also clinically important manifestations of the MPS VI syndrome, the present study was initiated for detailed biochemical, histologic and functional analysis of cornea, optic nerve and heart in ASB-deficient mice. Biochemical evidence for GAG-storage could be obtained for liver, kidney, spleen and myocardium as well as for heart valves, cornea and optic nerve from ASB-deficient mice. In MPS VI mice, histology revealed structural impairment of corneal stroma and epithelium as well as a thickening of the heart valves. According to histologic investigations, the optic nerve appeared not to be altered. However, GAG-storage in the dura mater could be demonstrated in MPS VI mice. Heart function was assessed by echocardiography. While the dimensions of MPS VI hearts were not altered, these hearts clearly showed decreased myocardial contraction and a 50% reduction of cardiac output. In addition, insufficiencies in the mitral and aortic valves were detected. Thus, ASB-deficient mice resemble the phenotype of human MPS VI not only in the skeletal but also in the ocular and cardiac symptoms. To our knowledge, these in vivo evaluations of heart function represent the first respective investigation of a MPS VI animal model and should provide a valuable measure for therapy studies in the MPS VI mouse.
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PMID:Cardiac and ocular pathologies in a mouse model of mucopolysaccharidosis type VI. 1290 6

The levels of arylsulfatases A and B, alpha-amylase, aspartate transcarbamylase, and gamma-glutamyl transpeptidase were investigated during the infection of mice with schistosoma mansoni. This infection caused a significant (p < 0.001) increase in the activity of hepatic arylsulfatase B (ASB), aspartate transcarbamylases and gamma-glutamyl transpeptidase. A non-significant difference occurred for alpha-amylase (p < 0.3) and arylsulfatase A (p > 0.5) when compared to the control. The specific activity of hepatic ASB was progressively increased with the progression of the Schistosoma-infection. Moreover, the kinetic studies of hepatic ASB in Schistosoma-infection showed that a slight decrease in the value of K(m) and about a 40% increase in V(max) when compared to the control. In addition, the pH optimum of hepatic ASB was altered from 6 to 7 as a result of schistosomiasis. These observations suggest that there are schistosomiasis-associated changes of the catalytic and kinetic properties of hepatic ASB.
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PMID:Activity of some hepatic enzymes in schistosomiasis and concomitant alteration of arylsulfatase B. 1546 99

Mucopolysaccharidosis type VI (MPS VI, Maroteaux-Lamy syndrome, McKusick #253200) is a lysosomal storage disorder that is caused by a deficiency in the lysosomal exohydrolase N-acetylgalactosamine-4-sulphatase (4-sulphatase, EC 3.1.6.1). We report a patient with no obvious clinical signs of MPS VI that has 5% of normal 4-sulphatase catalytic capacity. This patient represents an index case for the attenuated end of the MPS VI clinical spectrum.
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PMID:An index case for the attenuated end of the mucopolysaccharidosis type VI clinical spectrum. 1597 36

Galsulfase [Aryplase, arylsulfatase B, BM 102, Naglazyme, rhASB, recombinant human N-acetylgalactosamine-4-sulfatase, recombinant human arylsulfatase B] is under development with BioMarin Pharmaceutical as an enzyme replacement therapy for the treatment of mucopolysaccharidosis (MPS) VI. MPS VI (also known as Maroteaux-Lamy syndrome) is a progressive, debilitating genetic disease resulting in early death. Patients with MPS VI have a deficiency in the arylsulfatase B (ASB) enzyme that is essential for the progressive breakdown of certain complex carbohydrates. The deficiency in ASB results in the build-up of carbohydrate residues in the lysosomes in all cells of the body. Patients are usually diagnosed at 6-24 months of age, and the symptoms include deceleration of growth, enlarged liver and spleen, skeletal and joint deformities, and upper airway obstruction. Patients do not survive past 20-30 years of age in the more severe cases, but may live longer with the milder cases, but with significant medical problems. While the symptoms of MPS VI are similar to those of MPS I, mental retardation associated with the severe forms of MPS I had not been reported for patients with MPS VI. For some patients, bone marrow transplantation is a treatment, albeit risky, option. MPS VI afflicts approximately 1100 patients in the world. In November 2004, BioMarin announced that it has filed a Biologics License Application (BLA) with the the US FDA for galsulfase for the treatment of MPS VI. The company has requested a priority review as part of the BLA submission, which, if granted, is expected to be completed within 6 months of submission. The FDA accepted the filing of the BLA for galsulfase for MPS VI in February 2005, and granted it a 6-month priority review period. The FDA's decision is due on 31 May 2005. The FDA has granted galsulfase orphan drug status and fast-track designation. Orphan drug status will provide BioMarin Pharmaceutical with 7 years of marketing exclusivity for galsulfase in the US providing that galsulfase is the first agent to gain approval in the US for MPS VI. BioMarin received an orphan drug designation from the EC for galsulfase for the treatment of MPS VI. Following positive safety and efficacy results from the phase I study with galsulfase, BioMarin Pharmaceutical commenced and successfully completed a phase II trial with rhASB in ten patients with MPS VI. This 24-week, open-label, multicentre trial was conducted at two sites, in the US and Australia (at the Lysosomal Diseases Research Unit, Women's and Children's Hospital, Adelaide, Australia, by Dr John Hopwood), and evaluated the safety, efficacy and pharmacokinetics of weekly intravenous infusions of galsulfase at a dose of 1.0 mg/kg. BioMarin Pharmaceutical completed a phase I/II clinical trial of galsulfase in six patients with MPS VI in the Children's Hospital, Oakland, CA, USA, with Dr Paul Harmatz as a principal investigator. This randomised, double-blind study evaluated the safety and efficacy of two doses of galsulfase administered by weekly intravenous infusions for 24 weeks. Five patients from the phase I study had completed the 24-week, open-label extension study. Data from this study confirmed safety and good tolerability of both doses of galsulfase with the 1.0 mg/kg dose producing greater sustained effects. The patients will continue receiving therapy in the future. Seven preclinical trials with galsulfase were conducted in a naturally occurring feline model of MPS VI disease at the Lysosomal Diseases Research Unit, Women's and Children's Hospital, Adelaide, Australia, by Dr John Hopwood. The company manufactures galsulfase at a GMP facility licensed from the State of California.
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PMID:Galsulfase: arylsulfatase B, BM 102, recombinant human arylsulfatase B, recombinant human N-acetylgalactosamine-4-sulfatase, rhASB. 1612 2

Sulfatase enzymes have important roles in metabolism of steroid hormones and of glycosaminoglycans (GAGs). The activity of five sulfatase enzymes, including steroid sulfatase (STS; arylsulfatase C), arylsulfatase A (ASA; cerebroside sulfatase), arylsulfatase B (ASB; N-acetylgalactosamine-4-sulfatase), galactose-6-sulfatase (GALNS), and iduronate-2-sulfatase (IDS), was compared in six different mammary cell lines, including the malignant mammary cell lines MCF7, T47D, and HCC1937, the MCF10A cell line which is associated with fibrocystic disease, and in primary epithelial and myoepithelial cell lines established from reduction mammoplasty. The effects of estrogen hormones, including estrone, estradiol, estrone 3-sulfate, and estradiol sulfate on activity of these sulfatases were determined. The malignant cell lines MCF7 and T47D had markedly less activity of STS, ASB, ASA, and GAL6S, but not IDS. The primary myoepithelial cells had highest activity of STS and ASB, and the normal epithelial cells had highest activity of GALNS and ASA. Greater declines in sulfatase activity occurred in response to estrone and estradiol than sulfated estrogens. The study findings demonstrated marked variation in sulfatase activity and in effects of exogenous estrogens on sulfatase activity among the different mammary cell types.
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PMID:Steroid sulfatase, arylsulfatases A and B, galactose-6-sulfatase, and iduronate sulfatase in mammary cells and effects of sulfated and non-sulfated estrogens on sulfatase activity. 1706 91

Mucopolysaccharidosis type VI (MPS VI; Maroteaux-Lamy syndrome) is a lysosomal storage disorder caused by mutations in the N-acetylgalactosamine-4-sulfatase (arylsulfatase B, ARSB) gene. ARSB is a lysosomal enzyme involved in the degradation of the glycosaminoglycans (GAG) dermatan and chondroitin sulfate. ARSB mutations reduce enzyme function and GAG degradation, causing lysosomal storage and urinary excretion of these partially degraded substrates. Disease onset and rate of progression is variable, producing a spectrum of clinical presentation. In this study, 105 MPS VI patients-representing about 10% of the world MPS VI population-were studied for molecular genetic and biochemical parameters. Direct sequencing of patient genomic DNA was used to identify ARSB mutations. In total, 83 different disease-causing mutations were found, 62 of which were previously unknown. The novel sequence changes included: 38 missense mutations, five nonsense mutations, 11 deletions, one insertion, seven splice-site mutations, and four polymorphisms. ARSB mutant protein and residual activity were determined on fibroblast extracts for each patient. The identification of many novel mutations unique to individuals/their families highlighted the genetic heterogeneity of the disorder and provided an appropriate cohort to study the MPS VI phenotypic spectrum. This mutation analysis has identified a clear correlation between genotype and urinary GAG that can be used to predict clinical outcome.
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PMID:Mutational analysis of 105 mucopolysaccharidosis type VI patients. 1745 71

Degenerative joint disease (DJD) is one aspect of mucopolysaccharidosis VI (MPS VI) pathology that has proven resistant to systemic enzyme replacement therapy (ERT). In this study the effect of repeated intra-articular injections (IA INJ) of recombinant human acetylgalactosamine-4-sulfatase (rh4S) on DJD was examined. Four MPS VI cats received i.v. ERT weekly from birth plus IA INJ (0 or 500 microg of rh4S per joint; monthly or every three months) while three MPS VI cats received IA INJ only. After 10 months, shoulders, elbows and knees were compared. Taken individually, an improvement in joint appearance was observed between the joints that received rh4S monthly or every three months compared with the contralateral joints treated with buffer or at lower frequency. Within articular cartilage of joints treated more frequently, the depth of clearance of lysosomal storage tended to be greater and uronic acid content was reduced reflecting the removal of glycosaminoglycans. Synovium in treated joints also showed less storage. No abnormal clinical signs were observed after the IA INJ and negligible antibody titres were measured throughout the study. No clear benefit was observed by combining IA INJ with weekly ERT and the most significant improvement in joint appearance resulted from increased IA INJ frequency. These data support the view that intra-articular therapy may be a good option for preventing the development of the severe articular pathology in MPS VI.
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PMID:Long-term intra-articular administration of recombinant human N-acetylgalactosamine-4-sulfatase in feline mucopolysaccharidosis VI. 1754 10

Maroteaux-Lamy syndrome, or mucopolysaccharidosis VI (MPS VI), is an autosomal recessive lysosomal storage disorder caused by a deficiency of N-acetylgalactosamine-4-sulfatase or arylsulfatase B (ARSB). We aimed to analyze the spectrum of mutations responsible for the disorder in Spanish and Argentinian patients, not previously studied. We identified all the ARSB mutant alleles, nine of them novel, in 12 Spanish and 4 Argentinian patients. The new changes were as follows: six missense mutations: c.245T>G [p.L82R], c.413A>G [p.Y138C], c.719C>T [p.S240F], c.922G>A [p.G308R], c.1340G>T [p.C447F] and c.1415T>C [p.L472P]; one nonsense mutation: c.966G>A [p.W322X]; and two intronic changes involving splice sites: c.1142+2T>A, in the donor splice site of intron 5, which promotes skipping of exon 5, and c.1143-1G>C, which disrupts the acceptor site of intron 5, resulting in skipping of exon 6. We also report 10 previously described mutations as well as several non-pathogenic polymorphisms. Haplotype analysis indicated a common origin for most of the mutations found more than once. Most of the patients were compound heterozygotes, whereas only four of them were homozygous. These observations confirm the broad allelic heterogeneity of the disease, with 19 different mutations in 16 patients. However, the two most frequent mutations, c.1143-1G>C and c.1143-8T>G, present in both populations, accounted for one-third of the mutant alleles in this group of patients.
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PMID:Identification of the molecular defects in Spanish and Argentinian mucopolysaccharidosis VI (Maroteaux-Lamy syndrome) patients, including 9 novel mutations. 1764 32

MPS VI (mucopolysaccharidosis type VI) is a lysosomal storage disease in which deficient activity of the enzyme N-acetylgalactosamine 4-sulfatase [ASB (arylsulfatase B)] impairs the stepwise degradation of the GAG (glycosaminoglycan) dermatan sulfate. Clinical studies of ERT (enzyme replacement therapy) by using rhASB (recombinant human ASB) have been reported with promising results. The release of GAG into the urine is currently used as a biomarker of disease, reflecting in some cases disease severity and in all cases therapeutic responsiveness. Using RNA studies in four Italian patients undergoing ERT, we observed that TNFalpha (tumour necrosis factor alpha) might be a biomarker for MPS VI responsive to therapy. In addition to its role as a potential biomarker, TNFalpha expression could provide insights into the possible pathophysiological mechanisms underlying the mucopolysaccharidoses.
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PMID:Molecular markers for the follow-up of enzyme-replacement therapy in mucopolysaccharidosis type VI disease. 1767 28


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