Fluorine-18 labeling of monoclonal antibodies and fragments with preservation of immunoreactivity.

Published

Journal Article

A new method is reported for labeling proteins with the positron-emitting nuclide 18F. Initially, 4-[18F]-fluorobenzylamine was prepared in two steps from aqueous [18F]fluoride in high yield. The 18F acylation agent was formed by reaction of this product with disuccinimidyl suberate. Overall yields for the 4-[18F]fluorobenzylamine succinimidyl ester ([18F]SFBS), decay corrected to the end of cyclotron bombardment, were about 30% in a synthesis time of 60 min. After a 15-min reaction, 30-45% (decay corrected) of the [18F]SFBS could be coupled to intact antibodies and their F(ab')2 and Fab fragments. Coupling yields were dependent on protein concentration but not reaction time. HPLC purification of [18F]SFBS was necessary to obtain optimal coupling efficiency and immunoreactivity. The immunoreactivities of 18F-labeled F(ab')2 and Fab fragments of an antimyosin antibody were 89 +/- 5% and 75 +/- 9%, respectively. Biodistribution studies in normal mice demonstrated similar in vivo behavior of 18F-labeled antibody fragments and those labeled with 125I by using N-succinimidyl 3-[125I]iodobenzoate. These results indicate that this method may be useful for labeling monoclonal antibodies and other proteins and peptides with 18F.

Full Text

Duke Authors

Cited Authors

  • Garg, PK; Garg, S; Zalutsky, MR

Published Date

  • January 1, 1991

Published In

Volume / Issue

  • 2 / 1

Start / End Page

  • 44 - 49

PubMed ID

  • 1878410

Pubmed Central ID

  • 1878410

International Standard Serial Number (ISSN)

  • 1043-1802

Language

  • eng

Conference Location

  • United States