当前位置： SCI文献检索 > NUCLEAR MEDICINE AND BIOLOGY期刊下所有文献 > Improved xenograft targeting of tumor-specific anti-epidermal growth factor receptor variant III antibody labeled using N-succinimidyl 4-guanidinomethyl-3-iodobenzoate.

Improved xenograft targeting of tumor-specific anti-epidermal growth factor receptor variant III antibody labeled using N-succinimidyl 4-guanidinomethyl-3-iodobenzoate.

Abstract：

:Monoclonal antibodies (mAbs) such as the tumor-specific anti-epidermal growth factor receptor variant III (EGFRvIII) that are internalized and degraded after cell binding necessitate the use of radioiodination methods that minimize the loss of radioactivity from the tumor cell after intracellular processing. The purpose of the current study was to determine the suitability of N-succinimidyl 4-guanidinomethyl-3-iodobenzoate (SGMIB) for labeling this internalizing mAb. A series of paired-label biodistribution experiments were performed in athymic mice bearing subcutaneous, EGFRvIII-expressing, D-256 human glioma and U87 Delta EGFR xenografts. The tissue distribution of radioiodine activity following injection of anti-EGFRvIII mAb L8A4 labeled using N-succinimidyl 4-guanidinomethyl-3-iodobenzoate (SGMIB) were compared to those for mAb labeled using Iodogen, N-succinimidyl 3-iodo-5-pyridinecarboxylate (SIPC) as well as the Boc-protected precursor of SGMIB. Tumor uptake of radioiodine activity for mAb labeled via SGMIB was significantly higher than co-administered L8A4 radioiodinated by other methods. For example, 3 days after injection, D-256 tumor uptake of L8A4 labeled via SGMIB was 20.4 +/- 4.6% ID/g compared with 11.7 +/- 5.5% ID/g when the SIPC method was used. Thyroid uptake for L8A4 (SGMIB) was up to 36 times lower than L8A4 (Iodogen) and less than 0.35% in all experiments, indicating a low degree of deiodination in vivo. These results suggest that SGMIB may be a useful reagent for the radioiodination of this internalizing anti-EGFRvIII mAb.

journal_name

Nucl Med Biol

journal_title

Nuclear medicine and biology

authors

Vaidyanathan G,Affleck DJ,Bigner DD,Zalutsky MR

doi

10.1016/s0969-8051(01)00277-3

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

1-11

issue

1

eissn

0969-8051

issn

1872-9614

pii

S0969805101002773

journal_volume

29

pub_type

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