High-level production of recombinant human lysosomal acid alpha-glucosidase in Chinese hamster ovary cells which targets to heart muscle and corrects glycogen accumulation in fibroblasts from patients with Pompe disease. 1996

J L Van Hove, and H W Yang, and J Y Wu, and R O Brady, and Y T Chen
Department of Pediatrics, Duke University Medical Center, Durham, NC 27710, USA.

Infantile Pompe disease is a fatal genetic muscle disorder caused by a deficiency of acid alpha-glucosidase, a glycogen-degrading lysosomal enzyme. We constructed a plasmid containing a 5'-shortened human acid alpha-glucosidase cDNA driven by the cytomegalovirus promoter, as well as the aminoglycoside phosphotransferase and dihydrofolate reductase genes. Following transfection in dihydrofolate reductase-deficient Chinese hamster ovary cells, selection with Geneticin, and amplification with methotrexate, a cell line producing high levels of the alpha-glucosidase was established. In 48 hr, the cells cultured in Iscove's medium with 5 mM butyrate secreted 110-kDa precursor enzyme that accumulated to 91 micrograms.ml-1 in the medium (activity, > 22.6 mumol.hr-1.ml-1). This enzyme has a pH optimum similar to that of the mature form, but a lower Vmax and Km for 4-methylumbelliferyl-alpha-D-glucoside. It is efficiently taken up by fibroblasts from Pompe patients, restoring normal levels of acid alpha-glucosidase and glycogen. The uptake is blocked by mannose 6-phosphate. Following intravenous injection, high enzyme levels are seen in heart and liver. An efficient production system now exists for recombinant human acid alpha-glucosidase targeted to heart and capable of correcting fibroblasts from patients with Pompe disease.

UI MeSH Term Description Entries
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D008247 Lysosomes A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterized by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured or undergoes MEMBRANE FUSION. (From Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed). Autolysosome,Autolysosomes,Lysosome
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009132 Muscles Contractile tissue that produces movement in animals. Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D009206 Myocardium The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow. Muscle, Cardiac,Muscle, Heart,Cardiac Muscle,Myocardia,Cardiac Muscles,Heart Muscle,Heart Muscles,Muscles, Cardiac,Muscles, Heart
D011994 Recombinant Proteins Proteins prepared by recombinant DNA technology. Biosynthetic Protein,Biosynthetic Proteins,DNA Recombinant Proteins,Recombinant Protein,Proteins, Biosynthetic,Proteins, Recombinant DNA,DNA Proteins, Recombinant,Protein, Biosynthetic,Protein, Recombinant,Proteins, DNA Recombinant,Proteins, Recombinant,Recombinant DNA Proteins,Recombinant Proteins, DNA
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D005347 Fibroblasts Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules. Fibroblast
D006003 Glycogen
D006009 Glycogen Storage Disease Type II An autosomal recessively inherited glycogen storage disease caused by GLUCAN 1,4-ALPHA-GLUCOSIDASE deficiency. Large amounts of GLYCOGEN accumulate in the LYSOSOMES of skeletal muscle (MUSCLE, SKELETAL); HEART; LIVER; SPINAL CORD; and BRAIN. Three forms have been described: infantile, childhood, and adult. The infantile form is fatal in infancy and presents with hypotonia and a hypertrophic cardiomyopathy (CARDIOMYOPATHY, HYPERTROPHIC). The childhood form usually presents in the second year of life with proximal weakness and respiratory symptoms. The adult form consists of a slowly progressive proximal myopathy. (From Muscle Nerve 1995;3:S61-9; Menkes, Textbook of Child Neurology, 5th ed, pp73-4) Acid Maltase Deficiency Disease,Generalized Glycogenosis,Glycogenosis 2,Lysosomal alpha-1,4-Glucosidase Deficiency Disease,Pompe Disease,Acid Alpha-Glucosidase Deficiency,Acid Maltase Deficiency,Adult Glycogen Storage Disease Type II,Alpha-1,4-Glucosidase Deficiency,Deficiency Disease, Acid Maltase,Deficiency Disease, Lysosomal alpha-1,4-Glucosidase,Deficiency of Alpha-Glucosidase,GAA Deficiency,GSD II,GSD2,Glycogen Storage Disease II,Glycogen Storage Disease Type 2,Glycogen Storage Disease Type II, Adult,Glycogen Storage Disease Type II, Infantile,Glycogen Storage Disease Type II, Juvenile,Glycogenosis Type II,Infantile Glycogen Storage Disease Type II,Juvenile Glycogen Storage Disease Type II,Pompe's Disease,Acid Alpha Glucosidase Deficiency,Acid Alpha-Glucosidase Deficiencies,Acid Maltase Deficiencies,Alpha 1,4 Glucosidase Deficiency,Alpha-1,4-Glucosidase Deficiencies,Alpha-Glucosidase Deficiencies,Alpha-Glucosidase Deficiencies, Acid,Alpha-Glucosidase Deficiency,Alpha-Glucosidase Deficiency, Acid,Deficiencies, Acid Alpha-Glucosidase,Deficiencies, Acid Maltase,Deficiencies, Alpha-1,4-Glucosidase,Deficiencies, GAA,Deficiency of Alpha Glucosidase,Deficiency, Acid Alpha-Glucosidase,Deficiency, Acid Maltase,Deficiency, Alpha-1,4-Glucosidase,Deficiency, GAA,Disease, Pompe,Disease, Pompe's,GAA Deficiencies,GSD2s,Generalized Glycogenoses,Glycogenoses, Generalized,Glycogenosis, Generalized,Lysosomal alpha 1,4 Glucosidase Deficiency Disease,Maltase Deficiencies, Acid,Pompes Disease,Type II, Glycogenosis,Type IIs, Glycogenosis

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