title: Coupling of the antitumoral enzyme bovine seminal ribonuclease to polyethylene glycol chains increases its systemic efficacy in mice.
abstract: Bovine seminal ribonuclease (BS-RNase) is an antitumoral active enzyme exhibiting specific antitumoral action against a number of different cancer cell lines. However, its systemic use is limited by its pharmacokinetic properties and antigenicity. Therefore, it was conjugated to polyethylene glycol (PEG) chains to overcome these problems. Measurement of aspermatogenic effects of the preparation after s.c. injection and injection into the scrotum was chosen as a model for the distribution of the enzyme in the body mediated by the linkage to PEG chains. Additionally, the antigenicity of BS-RNase coupled to PEG chains (BS-RNase-PEG) was compared to that of free BS-RNase, as antigenicity is known to be one of the main obstacles in the use of protein-based drugs. BS-RNase-PEG caused aspermatogenic effects after systemic administration to mice in very low concentrations at which free BS-RNase is not effective. Moreover, BS-RNase possessed a very low antigenicity as long as it was coupled to the PEG chains. In order to investigate the antitumoral efficacy of BS-RNase-PEG in vivo, preliminary experiments on the effect of the conjugate on neuroblastoma growth in mice were performed in a UKF-NB-3 xeno-transplantate model, demonstrating a drastically increased anti-tumoral activity of the conjugate compared to the free enzyme.
authors.affiliation: Institut für Medizinische Virologie, Klinikum der Johann Wolfgang Goethe-Universität, 60596 Frankfurt am Main, Germany. Michaelis@em.uni-frankfurt.de
authors.forename: Martin
authors.initials: M
authors.lastname: Michaelis
authors.forename: Jindrich
authors.initials: J
authors.lastname: Cinatl
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Cinatl
authors.forename: Pavla
authors.initials: P
authors.lastname: Pouckova
authors.forename: Klaus
authors.initials: K
authors.lastname: Langer
authors.forename: Jörg
authors.initials: J
authors.lastname: Kreuter
authors.forename: Josef
authors.initials: J
authors.lastname: Matousek
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology; D002417:Cattle; D004722:Endoribonucleases / Q000737:chemistry* / Q000276:immunology / Q000494:pharmacology; D005260:Female; D006801:Humans; D020128:Inhibitory Concentration 50; D007267:Injections; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009447:Neuroblastoma / Q000188:drug therapy*; D011092:Polyethylene Glycols / Q000737:chemistry; D012671:Seminiferous Tubules / Q000187:drug effects; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D011092:Polyethylene Glycols; D004722:Endoribonucleases; C032523:ribonuclease SPL