Cytotoxicity Acquired by Conjugation of an Anti-Thy1.1 Monoclonal Antibody and the Ribosome-Inactivating Protein, Gelonin
| Autor: | S. I. Detre, Walter C. J. Ross, Philip E. Thorpe, D. C. Edwards, Anthony J. S. Davies, Fiorenzo Stirpe, Alex N. F. Brown, Alan J. Cumber |
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| Rok vydání: | 1981 |
| Předmět: |
Cytotoxicity
Immunologic Lymphoma T-Lymphocytes Antigen-Antibody Complex Lymphocyte Activation Biochemistry Antibodies Cell Line Mice Mice Inbred AKR chemistry.chemical_compound Animals Cytotoxic T cell Disulfides Phytohemagglutinins Gelonin Cytotoxicity Glycoproteins Plant Proteins biology Ribosome-inactivating protein Antibodies Monoclonal Neoplasms Experimental Molecular biology Molecular Weight Ricin chemistry Plant protein Concanavalin A Ribosome Inactivating Proteins Type 1 biology.protein Immunotherapy Abrin |
| Zdroj: | European Journal of Biochemistry. 116:447-454 |
| ISSN: | 1432-1033 0014-2956 |
| DOI: | 10.1111/j.1432-1033.1981.tb05356.x |
| Popis: | Gelonin, a plant protein which can powerfully reduce the protein-synthetic capacity of ribosome preparations, was covalently coupled to anti-Thy1.2 antibody. The conjugate was prepared using N-succinimidyl-3-(2-pyridyldithio)propionate which generates a disulphide linkage between the component molecules. Two conjugate fractions were obtained with Mr of 180 000 and greater than 200 000. After its linkage of the antibody, gelonin suppressed those Thy1.1-bearing T lymphocytes from AKR mice which will respond to phytohaemagglutinin and concanavalin A in tissue culture. The [3H]leucine incorporation with the T-cell mitogens was inhibited by 50% with the 180 000-Mr fraction at a concentration of 0.4 nM and with the greater than 200 000-Mr fraction of pM. Unconjugated gelonin induced comparable reductions in T-cell responsiveness but at concentrations of 30 nM. The conjugates exerted little or no effect upon B lymphocytes or T lymphocytes from CBA mice (Thy1.2 + ve). Thy1.1-expressing AKR lymphoma cell lines, AKR-A and BW5147, were found to be sensitive to the conjugates, albeit much less so than the normal T lymphocytes. The conjugates injected in vivo significantly prolonged the life of CBA mice bearing in an AKR-A lymphoma allograft. It is concluded that gelonin can, by its linkage to an antibody, be rendered cytotoxic with a potency to match or exceed those of the toxins abrin and ricin. |
| Databáze: | OpenAIRE |
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