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      Autophagy in Natural History and After ERT in Glycogenosis Type II.

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          Abstract

          We studied the role of autophagy in a series of 10 infantile-, juvenile-, and adult-onset GSDII patients and investigated autophagy blockade in successive biopsies of adult cases during disease natural history. We also correlated the autophagosome accumulation and efficiency of enzyme replacement therapy (ERT) in four treated cases (two infantile and two juvenile-adult onsets).The autophagic flux was monitored by measuring the amount of p62-positive protein aggregates and compared, together with fibre vacuolisation, to fibre atrophy.A blocked autophagic flux resulted in p62 accumulation, increased vacuolisation, and progressive atrophy of muscle fibres in biopsies collected from patients during natural history. On the contrary, in the GSDII cases early treated with ERT, the autophagic flux improved and muscle fibre atrophy, fibre vacuolisation, and acid phosphatase activity decreased.The functionality of the autophagy-lysosome system is essential in GSDII muscle, which is characterised by the presence of swollen glycogen-filled lysosomes and autophagic build-up. Defining the role of autophagy and its relationship with muscle loss is critical for understanding the disease pathogenesis, for developing new therapies, and for improving ERT efficacy in GSDII.

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          Author and article information

          Journal
          JIMD Rep
          JIMD reports
          Springer Science and Business Media LLC
          2192-8304
          2192-8304
          2015
          : 21
          Affiliations
          [1 ] Fondazione San Camillo Hospital IRCCS, 30100, Lido Venice, Italy, corrado.angelini@unipd.it.
          Article
          10.1007/8904_2014_389
          4470943
          25712382
          4941ba51-8a3c-4217-bab0-44885b17998b
          History

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