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Related Experiment Videos

Structure-function relationships in indium-111 radioimmunoconjugates.

K D Brandt1, D K Johnson

  • 1Abbott Laboratories, Department 90M, Abbott Park, Illinois 60064.

Bioconjugate Chemistry
|March 1, 1992
PubMed
Summary
This summary is machine-generated.

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The stability of indium-111 labeled antibody conjugates, determined by the polycarboxylate chelator structure, directly impacts their distribution in tumor-bearing mice. More stable chelates improve tumor targeting and reduce kidney accumulation of the radiometal.

Area of Science:

  • Radiopharmaceutical chemistry
  • Immunoconjugate development
  • Preclinical cancer research

Background:

  • Monoclonal antibody (mAb) conjugates are crucial for targeted cancer therapy and imaging.
  • The choice of chelator influences the stability and biodistribution of radiolabeled mAbs.
  • Understanding the structure-function relationship of chelates is vital for optimizing immunoconjugate performance.

Purpose of the Study:

  • To evaluate the impact of different amino polycarboxylate chelator structures on the in vivo behavior of indium-111 labeled B72.3 mAb conjugates.
  • To correlate chelate thermodynamic stability with radiometal tissue distribution and excretion in a preclinical tumor model.
  • To identify sensitive indicators of conjugate instability in vivo.

Main Methods:

Related Experiment Videos

  • Synthesis of B72.3 mAb conjugates with four benzyl isothiocyanate-derivatized polycarboxylate chelators (NTA, EGTA, EDTA, DTPA).
  • Labeling of conjugates with indium-111 (111In) and intravenous administration to athymic mice bearing human tumor xenografts (LS174T and A375).
  • Assessment of tissue distribution and excretion of 111In at 24 and 48 hours postinjection, controlling for antibody dose, xenograft size, and immunoreactivity.

    • Main Results:

    • Tissue distribution and excretion of 111In correlated directly with chelate thermodynamic stability (NTA < EGTA < EDTA < DTPA).
    • Increased chelate stability led to higher radioactivity in blood and tumor xenografts, and decreased levels in kidneys and excretion.
    • Kidney accumulation of unbound 111In was observed, potentially due to preclusion of uptake by serum transferrin, and kidney:blood/tumor ratios served as sensitive indices of conjugate instability.

    Conclusions:

    • The thermodynamic stability of the polycarboxylate chelator is a critical determinant of in vivo immunoconjugate performance.
    • The B72.3 mAb and athymic mouse xenograft model are suitable for structure-function studies of immunoglobulin labels.
    • Optimizing chelate structure can enhance tumor targeting and minimize off-target radiometal accumulation, particularly in the kidneys.