Deprivation of arginine and lysine interferes with growth of patient-derived tumor xenografts
Wolkersdorfer, A.; Bergmann, B.; Adelmann, J.; Ebbinghaus, M.; Guenther, E.; Gutmann, M.; Hahn, L.; Hurwitz, R.; Luehmann, T.; Schueler, J.; Schmidt, L.; Teifel, M.; Meinel, L.; Rudel, T.
Show abstract
In recent years, a novel treatment method for cancer emerged, which is based on the starvation of tumors of amino acids like arginine. The deprivation of arginine in serum is based on enzymatic degradation and can be realized by arginine deaminases like the L-amino acid oxidase found in the ink toxin of the sea hare Aplysia punctata. Previously isolated from the ink, the L-amino acids oxidase was described to oxidate the essential amino acid L-lysine and L-arginine to their corresponding deaminated alpha-keto acids. Here, we present the recombinant production and functionalization of amino acid oxidase Aplysia Punctata ink toxin (APIT). PEGylated APIT (APIT-PEG) increased the blood circulation time. APIT-PEG treatment of patient-derived xenografted mice shows a significant dose dependent reduction of tumor growth over time mediated by amino acid starvation of the tumor. Treatment of mice with APIT-PEG which lead to deprivation of arginine was well tolerated.
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