The invention is based on the introduction of mutations into the amino acid sequence of human Arylsulfatase A (ASA or ARSA) in order to increase protein stability. The invention introduces amino acid mutations, such as deletions, substitutions or additions, into the C-terminal part of the human ARSA enzyme, in particular at a position around or at amino acid 424, which result in a sequence that does not comprise E424. Provided are further nucleic acids and vectors for the expression of the mutated ARSA of the invention, recombinant cells and pharmaceutical composition comprising the mutated ARSA, as well as its use in the treatment of diseases that are characterized by a reduced activity of endogenous ARSA.

Methods of producing arylsulfatase A are described herein. The methods can include one or more steps of chromatography. Exemplary chromatographic steps include ion exchange chromatography, mixed mode chromatography, and hydrophobic interaction chromatography. Compositions containing and methods using arylsulfatase A produced by the methods described herein are also disclosed.

The present invention provides, among other things, compositions and methods for CNS delivery of lysosomal enzymes for effective treatment of lysosomal storage diseases. In some embodiments, the present invention includes a stable formulation for direct CNS intrathecal administration comprising a heparan N-sulfatase (HNS) protein, salt, and a polysorbate surfactant for the treatment of Sanfilippo Syndrome Type A.

The present invention provides, among oilier things, compositions and methods for CNS delivery of lysosomal enzymes (e.g., recombinant human arylsulfatase A (rhASA)) for effective treatment of lysosomal storage diseases (e.g. Metachromatic Leukodystrophy Disease), In some embodiments, the present invention includes a stable formulation for intrathecal administration comprising an ASA protein and a poloxamer, wherein less than 3% of the ASA protein exists in aggregated form.

The present invention comprises a method of concentrating a composition comprising a polypeptide of interest and the use of such concentrated composition for the treatment of diseases in mammals, in particular by subcutaneous injection.

The present invention provides, among other things, compositions and methods for CNS delivery of lysosomal enzymes for effective treatment of lysosomal storage diseases. In some embodiments, the present invention includes a stable formulation for direct CNS intrathecal administration comprising an iduronate-2-sulfatase (I2S) protein, salt, and a polysorbate surfactant for the treatment of Hunters Syndrome.

Provided herein are methods and compositions for treating a subject suffering from a deficiency in arylsulfatase A in the CNS. The methods include systemic administration of a bifunctional fusion antibody comprising an antibody to a human insulin receptor and an arylsulfatase A.

The present invention pertains to a process for production of recombinant arylsulfatase A in a cell culture system, the process comprising culturing a mammalian cell capable of producing rASA in liquid medium in a system comprising one or more bio-reactors; and concentrating, purifying and formulating the rASA by a purification process comprising one or more steps of chromatography. Other aspects of the invention provides a pharmaceutical composition comprising rASA, which is efficiently endocytosed via the mannose-6-phosphate receptor pathway in vivo as well as a rhASA a medicament and use of a rhASA for the manufacture of a medicament for reducing the galactosyl sulphatide levels within target cells in the peripheral nervous system and/or within the central nervous system in a subject. A final aspect of the invention provides a method of treating a subject in need thereof, said method comprising administering to said subject a pharmaceutical composition comprising a rhASA and thereby obtaining a reduction in the galactosyl sulphatide levels in target cells within said subject.

The present invention provides, among other things, improved methods for purifying arylsulfatase A (ASA) protein produced recombinantly for enzyme replacement therapy. The present invention is, in part, based on the surprising discovery that recombinant ASA protein can be purified from unprocessed biological materials, such as, ASA-containing cell culture medium, using a process involving as few as four chromatography columns and only one step of post-chromatographic ultrafiltration/diafiltration.

Among other things, the present invention provides methods and compositions of treating Sanfilippo syndrome type B (Sanfilippo B) by, e.g., intrathecal (IT) administration of a Naglu protein. A suitable Naglu protein can be a recombinant, gene-activated or natural protein. In some embodiments, a suitable Naglu protein is a recombinant Naglu protein. In some embodiments, a recombinant Naglu protein is a fusion protein containing a Naglu domain and a lysosomal targeting moiety. In some embodiments, the lysosomal targeting domain is an IGF-II moiety.