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- W190328746 abstract "Electrophoretic properties of eight lysosomal hydrolases and 36 nonlysosomal enzymes were investigated in cultured fibroblasts from children with the inherited storage disease mucolipidosis II (ML II); fibroblasts from a child with a related disorder, mucolipidosis III (ML III); and two obligate heterozygous cell lines from parents of a ML II child. Cell homogenates of ML II fibroblast lines showed altered mobilities for lysosomal beta-hexosaminidase, acid phosphatase2, and alpha-mannosidase and deficient activity for the esterase-A4 and lysosomal alpha-mannosidase-B electrophoretic phenotypes. Altered mobility was also detected for the nonlysosomal enzyme adenosine deaminase-d. Deficient activities of other lysosomal enzymes were observed as previously reported. In a single ML III fibroblast line, only beta-hexosaminidase showed an abnormal electrophoretic pattern suggesting a difference between these cells and ML II fibroblasts. Thirty-five nonlysosomal enzymes associated with other cellular organelles and metabolic pathways were electrophoretically normal in all mucolipidosis cell lines. Heterozygous ML II cells showed normal expression for all enzymes. Two major patterns of altered lysosomal enzymes and adenosine deaminase were demonstrated in ML II cell lines, suggesting that at least two genetic forms of this disorder may exist. Neuraminidase treatment of ML II homogenates converted altered forms of acid phosphatase2 and adenosine deaminase-d and in two ML II lines, recovered the previously undetected lysosomal alpha-mannosidase band. These results are consistent with the mucolipidosis defect(s) being associated with abnormal post-translatinal processing of multiple lysosomal enzymes and adenosine deaminase-d." @default.
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- W190328746 date "1977-03-01" @default.
- W190328746 modified "2023-09-23" @default.
- W190328746 title "Electrophoretic abnormalities of lysosomal enzymes in mucolipidosis fibroblast lines." @default.
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