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Related Experiment Videos

Photoreactive 111In-cyclodextrin inclusion complex: a new heterobifunctional reagent for antibody labeling.

T S Wang1, R A Fawwaz, R L Van Heertum

  • 1Department of Radiology, Columbia University, New York, NY 10032.

International Journal of Radiation Applications and Instrumentation. Part B, Nuclear Medicine and Biology
|November 1, 1992
PubMed
Summary

A novel radiolabeled compound, N-5-azido-2-nitrobenzoylaminomethyl-111In-acetylacetone-alpha-cyclodextrin (VI), demonstrated superior immunoreactivity and reduced liver uptake compared to the BADTPA method for melanoma imaging.

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Area of Science:

  • Radiochemistry
  • Bioconjugation
  • Nuclear Medicine

Background:

  • Development of targeted radiopharmaceuticals is crucial for effective cancer imaging.
  • Alpha-cyclodextrin (α-CD) offers a versatile scaffold for drug delivery and radiolabeling.
  • Monoclonal antibody TP41.2 targets melanoma cells, enabling targeted delivery of imaging agents.

Purpose of the Study:

  • To synthesize and characterize a novel 111In-labeled alpha-cyclodextrin conjugate for melanoma imaging.
  • To evaluate the immunoreactivity and biodistribution of the novel conjugate compared to a standard method.

Main Methods:

  • Synthesis of N-5-azido-2-nitrobenzoylaminomethyl-111In-acetylacetone-alpha-cyclodextrin (VI) involving tosylation, azidation, reduction, complexation, and photoreactivation labeling.

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  • Preparation of 111In-DTPA-MAbTP41.2 as a control.
  • Assessment of immunoreactivity using a cell-binding assay.
  • Evaluation of biodistribution in non-tumor rats via gamma counting.

    • Main Results:

    • Compound VI exhibited significantly higher immunoreactivity (87%) compared to the BADTPA method (57%).
    • Biodistribution studies showed lower liver concentration for compound VI (3.5, 1.7, 1.0 %ID/g at 4, 24, 48 h) versus BADTPA (5.5, 5.2, 3.1 %ID/g).

    Conclusions:

    • The novel 111In-labeled alpha-cyclodextrin conjugate (VI) shows promising characteristics for targeted melanoma imaging.
    • The improved immunoreactivity and reduced non-specific uptake suggest potential for enhanced diagnostic efficacy.