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Boronated starburst dendrimer-monoclonal antibody immunoconjugates: Evaluation as a potential delivery system for neutron capture therapy

Barth, Rolf F., Adams, Dianne M., Soloway, Albert H., Alam, Fazlul, Darby, Michael V.·1994·Bioconjugate Chemistry

Abstract

Boron neutron capture therapy (BNCT) is based on the nuclear capture reaction that occurs when boron-10, a stable isotope, is irradiated with low-energy or thermal neutrons (< or = 0.025 eV) to yield high LET alpha particles and recoiling 7Li nuclei [10B + nth-->[11B]-->4He(alpha) + 7Li + 2.39 MeV]. Approximately 10(9) boron-10 atoms must be delivered to each target cell in order to sustain a lethal 10B(n,alpha)7Li reaction. If MoAbs are to be used for targeting boron-10, then it is essential that they recognize a surface membrane epitope that is highly expressed on tumor cells and that a large number of boron-10 atoms be attached to each antibody molecule. In order to heavily boronate MoAbs, we have utilized starburst dendrimers (SD), which are precise, spherical macromolecules composed of repetitive poly(amidoamino) groups. Second- and fourth-generation dendrimers, having 12 and 48 reactive terminal amino groups and molecular weights of 2414 and 10,632 Da, respectively, were boronated using an isocyanato polyhedral borane, Na(CH3)3NB10H8NCO. The boronated starburst dendrimers (BSD), in turn, were derivatized with m-maleimidobenzoyl N-hydroxysulfosuccinimide ester (sulfo-MBS). The MoAbIB16-6, which is directed against the murine B16 melanoma, was derivatized with N-succinimidyl 3-(2-pyridyldithio)propionate (SPDP). The MBS-derivatized BSD and SPDP-derivatized MoAb were reacted to yield stable immunoconjugates.(ABSTRACT TRUNCATED AT 250 WORDS)

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Authors
Barth, R. F., Adams, D. M., Soloway, A. H., Alam, F., & Darby, M. V.
Venue
Bioconjugate Chemistry
Published
1994-01-01
Volume
5
Issue
1
Pages
58-66
ISSN
  • 1043-1802 (ISSN-L)
  • 1520-4812
OpenAlex
W1979687564
Cited by
285
References
0
FWCI
11.14
Type
journal article
Language
en
Open access
closed

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