Radioiodination of antibodies via N-succinimidyl 2,4-dimethoxy-3-(trialkylstannyl)benzoates.

Published

Journal Article

We have previously shown that use of N-succinimidyl 3-iodobenzoate (SIB) for radioiodination of monoclonal antibodies (MAbs) decreases the loss of radioiodine in vivo compared to MAbs labeled by using conventional methods. Herein, the synthesis of N-succinimidyl 2,4-dimethoxy-3-(trialkylstannyl)benzoates (alkyl = Me, Bu) are described as is their use as precursors for the radiosynthesis of N-succinimidyl 2,4-dimethoxy-3-iodobenzoate (SDMIB). A MAb F(ab')2 fragment labeled with SDMIB retained its ability to bind specifically to tumor homogenates. Paired-label tissue distribution studies indicate that the thyroid uptake (an indicator of deiodination) of hydrolyzed SDMIB was about 20 times that of hydrolyzed SIB. In contrast, thyroid uptake for SDMIB, when conjugated to a MAb, was only 1.4-2.8 times that for SIB and was considerably lower than levels reported in the literature for MAbs labeled by using direct, electrophilic iodination methods. Although MAbs labeled with SDMIB are significantly more inert to dehalogenation than those labeled by conventional methods, compared to the original SIB reagent, addition of two methoxy groups decreased retention of label in vivo.

Full Text

Duke Authors

Cited Authors

  • Vaidyanathan, G; Zalutsky, MR

Published Date

  • November 1990

Published In

Volume / Issue

  • 1 / 6

Start / End Page

  • 387 - 393

PubMed ID

  • 2099187

Pubmed Central ID

  • 2099187

International Standard Serial Number (ISSN)

  • 1043-1802

Language

  • eng

Conference Location

  • United States