sphingolipidoses/carbohydrate

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Synthesis of " All-Cis" Trihydroxypiperidines from a Carbohydrate-Derived Ketone: Hints for the Design of New β-Gal and GCase Inhibitors

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Pharmacological chaperones (PCs) are small compounds able to rescue the activity of mutated lysosomal enzymes when used at subinhibitory concentrations. Nitrogen-containing glycomimetics such as aza- or iminosugars are known to behave as PCs for lysosomal storage disorders (LSDs). As part of our

[Phenotypes in heteroglycanoses and sphingolipidoses (author's transl)].

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Sphingolipidoses and heteroglycanoses are inborn errors of the carbohydrate metabolism. Biochemically and clinically hetero-glycanoses are sub-divided into mucopolysaccharidoses, oligosaccharidoses and mucolipidoses. These disorders of complex carbohydrate metabolism are due to the inborn defect of

A historical perspective of the glycosphingolipids and sphingolipidoses.

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Glycosphingolipids are a polysaccharide chain between 1 and 40 carbohydrate residues long glycosidically linked to ceramide (a long-chain aliphatic amino-alcohol or sphingoid) that is embedded in the cell plasma membrane with the carbohydrate moiety on the outside. The sphingoid imparts rigidity to

Cancer and sphingolipid storage disease therapy using novel synthetic analogs of sphingolipids.

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Sphingolipid metabolites have become recognized for their participation in cell functions and signaling events that control a wide array of cellular activities. Two main sphingolipids, ceramide and sphingosine-1-phosphate, are involved in signaling pathways that regulate cell proliferation,

The effect of N-octyl-β-valienamine on β-glucosidase activity in tissues of normal mice.

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Gaucher disease (GD), mainly caused by a defect of acid β-glucosidase (β-Glu), is the most common sphingolipidosis. We have previously shown that a carbohydrate mimic N-octyl-β-valienamine (NOV), an inhibitor of β-Glu, could increase the protein level and enzyme activity of various mutant β-Glu in

N-octyl-beta-valienamine up-regulates activity of F213I mutant beta-glucosidase in cultured cells: a potential chemical chaperone therapy for Gaucher disease.

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Gaucher disease (GD) is the most common form of sphingolipidosis and is caused by a defect of beta-glucosidase (beta-Glu). A carbohydrate mimic N-octyl-beta-valienamine (NOV) is an inhibitor of beta-Glu. When applied to cultured GD fibroblasts with F213I beta-Glu mutation, NOV increased the protein

Processing of sphingolipid activator proteins and the topology of lysosomal digestion.

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Plasma membrane derived glycosphingolipids (GSLs) destined for digestion are internalized through the endocytic pathway and delivered to the lysosomes. There, GSLs are degraded by the action of exohydrolases, which are supported, in the case of GSLs with short oligosaccharide chains, by sphingolipid

Enzyme enhancement activity of N-octyl-beta-valienamine on beta-glucosidase mutants associated with Gaucher disease.

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Gaucher disease (GD), caused by a defect of beta-glucosidase (beta-Glu), is the most common form of sphingolipidosis. We have previously shown that a carbohydrate mimic N-octyl-beta-valienamine (NOV), an inhibitor of beta-Glu, could increase the protein level and enzyme activity of F213I mutant

The pharmacological chaperone effect of N-octyl-beta-valienamine on human mutant acid beta-glucosidases.

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Gaucher's disease (GD), mainly caused by a defect of acid beta-glucosidase (beta-Glu), is the most common form of sphingolipidosis. We have previously shown that the carbohydrate mimic and inhibitor of beta-Glu, N-octyl-beta-valienamine (NOV), could increase the protein level and enzyme activity of

Mental retardation, hypotonia, and generalized seizures associated with astrocytic "residual" bodies. An ultrastructural study.

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Two siblings suffering since birth from convulsions, hypotonia, and mental retardation are presented. In the older sibling (eight and one-half years of age) frontal lobe biopsy revealed abnormal cytosomes with lamellar profiles in astrocytes, macrophages, and to a lesser degree in neurons. Similar

Glycosidases: inborn errors of glycosphingolipid catabolism.

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Glycosphingolipids (GSLs) are information-rich glycoconjugates that occur in nature mainly as constituents of biomembranes. Each GSL contains a complex carbohydrate chain linked to a ceramide moiety that anchors the molecule to biomembranes. In higher animals, catabolism of GSLs takes place in

A new turning point in glycosphingolipid research.

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Research on glycosphingolipids has advanced with the finding of their involvement in sphingolipidoses, blood group- and differentiation-related antigens, and receptors for bacteria and viruses. Recently, the molecular cloning of genes for the synthesis of glycosphingolipids has been performed

Principles of lysosomal membrane degradation: Cellular topology and biochemistry of lysosomal lipid degradation.

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Cellular membranes enter the lysosomal compartment by endocytosis, phagocytosis, or autophagy. Within the lysosomal compartment, membrane components of complex structure are degraded into their building blocks. These are able to leave the lysosome and can then be utilized for the resynthesis of

Saposin B mobilizes lipids from cholesterol-poor and bis(monoacylglycero)phosphate-rich membranes at acidic pH. Unglycosylated patient variant saposin B lacks lipid-extraction capacity.

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Sphingolipid activator proteins (SAPs), GM2 activator protein (GM2AP) and saposins (Saps) A-D are small, enzymatically inactive glycoproteins of the lysosome. Despite of their sequence homology, these lipid-binding and -transfer proteins show different specificities and varying modes of action.

Biosynthesis and degradation of mammalian glycosphingolipids.

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Glycolipids are a large and heterogeneous family of sphingolipids that form complex patterns on eukaryotic cell surfaces. This molecular diversity is generated by only a few enzymes and is a paradigm of naturally occurring combinatorial synthesis. We report on the biosynthetic principles leading to

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