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. 1986 Mar;77(3):977–984. doi: 10.1172/JCI112399

In vivo administration of lymphocyte-specific monoclonal antibodies in nonhuman primates. In vivo stability of disulfide-linked immunotoxin conjugates.

N L Letvin, V S Goldmacher, J Ritz, J M Yetz, S F Schlossman, J M Lambert
PMCID: PMC423497  PMID: 3081579

Abstract

The stability in vivo and circulatory clearance of immunotoxins were assessed in rhesus monkeys. The immunotoxins studied were T cell-specific monoclonal anti-T11 antibodies conjugated by disulfide linkage to ribosome-inactivating toxins. Intact immunotoxin was detectable in the circulation of the monkeys following a single intravenous infusion. This was demonstrated by quantitative flow-cytometric analysis, gel-filtration, and sodium dodecyl sulfate-gel electrophoresis. This intact conjugate was shown to be functional in the plasma of the infused animals in an in vitro cytotoxicity assay. However, a number of factors contributed to bring the level of circulating immunotoxin to a less than optimal level. When conjugated to a ribosome-inactivating toxin, the antibody was cleared more rapidly than was the native antibody. Furthermore, following infusion, some breakdown of the conjugate occurred, resulting in the generation of detectable levels of circulating free antibody. The present data indicate the feasibility of using immunotoxins as therapeutic tools in man.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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