The invention provides for novel treatments of lysosomal storage diseases, in particular of Neuronal Ceroid Lipofuscinosis (NCL) or synucleinopathy or a disease characterized by block of autophagic flow. The treatment comprises administration of human pro-Cathepsin, in particular human pro-Cathpsin D, B or L to patients in need thereof.

The invention relates a method for producing a stable recombinant protein, comprising growing a non-naturally occurring host cell in a culture medium to produce a recombinant protein, and making a composition comprising the recombinant protein and a polysorbate. The production of endogenous lipoprotein lipase by the host cell is reduced. The endogenous lipoprotein lipase is present in the composition in a small amount, and is capable of degrading the polysorbate. The invention also relates to the relevant host cells and compositions, and preparation thereof.

The invention relates a method for producing a stable recombinant protein, comprising growing a non-naturally occurring host cell in a culture medium to produce a recombinant protein, and making a composition comprising the recombinant protein and a polysorbate. The production of endogenous lipoprotein lipase by the host cell is reduced. The endogenous lipoprotein lipase is present in the composition in a small amount, and is capable of degrading the polysorbate. The invention also relates to the relevant host cells and compositions, and preparation thereof.

The present disclosure relates to conjugates, preferably, antibody-drug conjugates, directed against select non-transmembrane tumor antigens that are normally intracellular but can be secreted from cancer cells, such as human cathepsin D, and can be targeted in a way that enables the selective delivery of the conjugate to cancer cells. The design and mechanism of action disclosed enable the preferential delivery of the conjugate prodrug to cancer cells over normal cells for the purpose of selectively killing cancer cells. The uses of such conjugates for the treatment of cancer are described.

Methods and compositions for the treatment or prevention of amyloidosis are provided. In some embodiments, the methods comprise administering to the subject a therapeutically effective amount of at least one catabolic enzyme or a biologically active fragment thereof. Such methods and compositions may be employed to reduce, prevent, degrade and/or eliminate amyloid formation in the lysosome and/or extracellularly.