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Hintze S, Limmer S, Dabrowska-Schlepp P, Berg B, Krieghoff N, Busch A, Schaaf A, Meinke P, Schoser B. Moss-Derived Human Recombinant GAA Provides an Optimized Enzyme Uptake in Differentiated Human Muscle Cells of Pompe Disease. Int J Mol Sci 2020; 21:ijms21072642. [PMID: 32290314 PMCID: PMC7177967 DOI: 10.3390/ijms21072642] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/07/2020] [Accepted: 04/08/2020] [Indexed: 12/22/2022] Open
Abstract
Pompe disease is an autosomal recessive lysosomal storage disorder (LSD) caused by deficiency of lysosomal acid alpha-glucosidase (GAA). The result of the GAA deficiency is a ubiquitous lysosomal and non-lysosomal accumulation of glycogen. The most affected tissues are heart, skeletal muscle, liver, and the nervous system. Replacement therapy with the currently approved enzyme relies on M6P-mediated endocytosis. However, therapeutic outcomes still leave room for improvement, especially with regard to skeletal muscles. We tested the uptake, activity, and effect on glucose metabolism of a non-phosphorylated recombinant human GAA produced in moss (moss-GAA). Three variants of moss-GAA differing in glycosylation pattern have been analyzed: two with terminal mannose residues in a paucimannosidic (Man3) or high-mannose (Man 5) configuration and one with terminal N-acetylglucosamine residues (GnGn). Compared to alglucosidase alfa the moss-GAA GnGn variant showed increased uptake in differentiated myotubes. Moreover, incubation of immortalized muscle cells of Gaa-/- mice with moss-GAA GnGn led to similarly efficient clearance of accumulated glycogen as with alglucosidase alfa. These initial data suggest that M6P-residues might not always be necessary for the cellular uptake in enzyme replacement therapy (ERT) and indicate the potential of moss-GAA GnGn as novel alternative drug for targeting skeletal muscle in Pompe patients.
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Affiliation(s)
- Stefan Hintze
- Friedrich-Baur-Institute, Department of Neurology, Ludwig-Maximilians-University Munich, 80336 Munich, Germany; (S.H.); (S.L.); (P.M.)
| | - Sarah Limmer
- Friedrich-Baur-Institute, Department of Neurology, Ludwig-Maximilians-University Munich, 80336 Munich, Germany; (S.H.); (S.L.); (P.M.)
| | | | - Birgit Berg
- Greenovation Biotech GmbH, 79108 Freiburg, Germany; (P.D.-S.); (B.B.); (N.K.); (A.B.); (A.S.)
| | - Nicola Krieghoff
- Greenovation Biotech GmbH, 79108 Freiburg, Germany; (P.D.-S.); (B.B.); (N.K.); (A.B.); (A.S.)
| | - Andreas Busch
- Greenovation Biotech GmbH, 79108 Freiburg, Germany; (P.D.-S.); (B.B.); (N.K.); (A.B.); (A.S.)
| | - Andreas Schaaf
- Greenovation Biotech GmbH, 79108 Freiburg, Germany; (P.D.-S.); (B.B.); (N.K.); (A.B.); (A.S.)
| | - Peter Meinke
- Friedrich-Baur-Institute, Department of Neurology, Ludwig-Maximilians-University Munich, 80336 Munich, Germany; (S.H.); (S.L.); (P.M.)
| | - Benedikt Schoser
- Friedrich-Baur-Institute, Department of Neurology, Ludwig-Maximilians-University Munich, 80336 Munich, Germany; (S.H.); (S.L.); (P.M.)
- Correspondence: ; Tel.: +49-(0)89-4400-57400; Fax: +49-(0)89-4400-57402
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Shen JS, Busch A, Day TS, Meng XL, Yu CI, Dabrowska-Schlepp P, Fode B, Niederkrüger H, Forni S, Chen S, Schiffmann R, Frischmuth T, Schaaf A. Mannose receptor-mediated delivery of moss-made α-galactosidase A efficiently corrects enzyme deficiency in Fabry mice. J Inherit Metab Dis 2016; 39:293-303. [PMID: 26310963 PMCID: PMC4754329 DOI: 10.1007/s10545-015-9886-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/13/2015] [Accepted: 07/29/2015] [Indexed: 01/02/2023]
Abstract
Enzyme replacement therapy (ERT) is an effective treatment for several lysosomal storage disorders (LSDs). Intravenously infused enzymes are taken up by tissues through either the mannose 6-phosphate receptor (M6PR) or the mannose receptor (MR). It is generally believed that M6PR-mediated endocytosis is a key mechanism for ERT in treating LSDs that affect the non-macrophage cells of visceral organs. However, the therapeutic efficacy of MR-mediated delivery of mannose-terminated enzymes in these diseases has not been fully evaluated. We tested the effectiveness of a non-phosphorylated α-galactosidase A produced from moss (referred to as moss-aGal) in vitro and in a mouse model of Fabry disease. Endocytosis of moss-aGal was MR-dependent. Compared to agalsidase alfa, a phosphorylated form of α-galactosidase A, moss-aGal was more preferentially targeted to the kidney. Cellular localization of moss-aGal and agalsidase alfa in the heart and kidney was essentially identical. A single injection of moss-aGal led to clearance of accumulated substrate in the heart and kidney to an extent comparable to that achieved by agalsidase alfa. This study suggested that mannose-terminated enzymes may be sufficiently effective for some LSDs in which non-macrophage cells are affected, and that M6P residues may not always be a prerequisite for ERT as previously considered.
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Affiliation(s)
- Jin-Song Shen
- Institute of Metabolic Disease, Baylor Research Institute, 3812 Elm Street, Dallas, TX, 75226, USA.
| | | | - Taniqua S Day
- Institute of Metabolic Disease, Baylor Research Institute, 3812 Elm Street, Dallas, TX, 75226, USA
| | - Xing-Li Meng
- Institute of Metabolic Disease, Baylor Research Institute, 3812 Elm Street, Dallas, TX, 75226, USA
| | - Chun I Yu
- Baylor Institute for Immunology Research, Dallas, TX, 75204, USA
| | | | | | | | - Sabrina Forni
- Institute of Metabolic Disease, Baylor Research Institute, 3812 Elm Street, Dallas, TX, 75226, USA
| | - Shuyuan Chen
- Baylor Research Institute, Dallas, TX, 75226, USA
| | - Raphael Schiffmann
- Institute of Metabolic Disease, Baylor Research Institute, 3812 Elm Street, Dallas, TX, 75226, USA
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