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In vivo measurement of the association constant of a radio-labelled monoclonal antibody in experimental immunotargeting.

Abstract：

:Exploring the fundamental mechanisms behind the low tumour uptake of labelled monoclonal antibodies (MoAbs) during in vivo immunotargeting, experiments were performed to estimate the in vivo value of the association constant (Ka) in an experimental targeting reaction. An artificial tumour model was utilised, based on diffusion chambers (DC) filled with antigen-coated polymer particles, implanted i.p. in normal, immunocompetent mice (NMRI/BOM). The MoAb H7 with specificity for placental alkaline phosphatase (PLALP) was chosen for this experiment. Each mouse carried two DC, one target DC filled with PLALP-coated particles, and a second control DC with the same amount of uncoated particles. The DC contained escalating doses of particles, ranging from 0.1 mg to 16 mg per DC, with groups of 6-12 animals per dose level. The next day after the implantation, a constant dose of 125I-labelled Fab fragments of H7 was injected i.v. in each mouse. The association constant Ka as measured from the binding data obtained in vivo was not significantly different from the value measured in vitro when the same target DC were incubated with the 125I-Fab in test tubes. This indicates that in vivo impairment of the antibody avidity is not the reason why a relatively low tumour uptake is generally experienced in immunotargeting studies.

journal_name

Br J Cancer

journal_title

British journal of cancer

authors

Fjeld JG,Benestad HB,Stigbrand T,Nustad K

doi

10.1038/bjc.1992.219

subject

Has Abstract

pub_date

1992-07-01 00:00:00

pages

74-8

issue

1

eissn

0007-0920

issn

1532-1827

journal_volume

66

pub_type

杂志文章

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