Chaperone-mediated gene therapy with recombinant AAV-PPCA in a new mouse model of type I sialidosis.

Abstract

The lysosomal storage disease sialidosis is caused by a primary deficiency of the sialidase N-acetyl-α-neuraminidase-1 (NEU1). Patients with type I sialidosis develop an attenuated, non-neuropathic form of the disease also named cherry red spot myoclonus syndrome, with symptoms arising during juvenile/ adult age. NEU1 requires binding to its chaperone, protective protein/cathepsin A (PPCA), for lysosomal compartmentalization, stability and catalytic activation. We have generated a new mouse model of type I sialidosis that ubiquitously expresses a NEU1 variant carrying a V54M amino acid substitution identified in an adult patient with type I sialidosis. Mutant mice developed signs of lysosomal disease after 1year of age, predominantly in the kidney, albeit low residual NEU1 activity was detected in most organs and cell types. We demonstrate that the activity of the mutant enzyme could be effectively increased in all systemic tissues by chaperone-mediated gene therapy with a liver-tropic recombinant AAV2/8 vector expressing PPCA. This resulted in clear amelioration of the disease phenotype. These results suggest that at least some of the NEU1 mutations associated with type I sialidosis may respond to PPCA-chaperone-mediated gene therapy.

• Authors: Erik J Bonten, Gouri Yogalingam, Huimin Hu, Elida Gomero, Diantha van de Vlekkert, Alessandra d'Azzo
• Journal: Biochimica et biophysica acta (Biochim Biophys Acta) Vol. 1832 Issue 10 Pg. 1784-92 (Oct 2013) ISSN: 0006-3002 [Print] Netherlands
• PMID: 23770387 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Published by Elsevier B.V.

Chemical References

• Molecular Chaperones

Topics

• Animals
• Dependovirus (genetics)
• Disease Models, Animal
• Genetic Therapy
• Mice
• Mice, Knockout
• Molecular Chaperones (metabolism)
• Mucolipidoses (therapy)
• Recombination, Genetic