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Synthesis and Characterization of p-Borono-Phenylalanine-Branched Polypeptide-Monoclonal Antibody Ternary Systems for Potential Use in Boron Neutron Capture Therapy (BNCT)

Research Group of Peptide Chemistry, Hungarian Academy of Sciences, H-1518 Budapest 112, POB 32 Hungary

Ferenc Hudecz

Research Group of Peptide Chemistry, Hungarian Academy of Sciences, H-1518 Budapest 112, POB 32 Hungary

Mária Szekerke

Research Group of Peptide Chemistry, Hungarian Academy of Sciences, H-1518 Budapest 112, POB 32 Hungary

Judit Kajtár

Department of Organic Chemistry, Eötvös L. University, Budapest, Hungary

Gabriella Sármay

Department of Immunology, Eötvös L. University, Göd, Hungary

János Gergely

Department of Immunology, Eötvös L. University, Göd, Hungary

Zsuzsa Nagy

Institute of Biology, Semmelweis Medical University, Budapest, Hungary

J. A. Clegg

Cancer Research Laboratory, University of Nottingham, UK

The application of the ¹⁰B (n,) ⁷Li capture reaction to cancer radiotherapy (Boron Neutron Capture Therapy) was studied to avoid the inherent disadvantages of conventional radiation therapy. p-Borono-phenylalanine (Bph) was used as the ¹⁰B source and mAb produced against HCMB melanoma cells was applied as targeting device. Since extensive direct boronation of mAb led diminished recognition of antigens, an intermediate carrier was used. Nontoxic, biocompatible, biodegradable and weakly immunogenic branched polypeptides with a polylysine backbone was used to carry a high number of ¹⁰B. Protected ¹⁰B-Bph was coupled by four different methods to polycationic branched polypeptides. The coupling efficiency varied according to the experimental conditions, with a maximum of 90%. The chiroptical properties of the conjugates indicated an ordered conformation which increased with the number of coupled Bph. The whole body survival (WBS) and tissue distribution profile of mAb (8/6 IgG2a) were markedly altered after conjugation with Bph-branched polypeptide. Decreased WBS and intermediate-carrier-dependent accumulation in the spleen, liver and kidney was observed 24 h after iv. administration. After joining only a few chains of the highly loaded Bph-AK conjugate to mAb, the binding activity of the mAb in the ternary system was preserved compared to control.

Journal of Bioactive and Compatible Polymers, Vol. 11, No. 4, 263-285 (1996)
DOI: 10.1177/088391159601100401


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