Molecular and biological properties of an abrin A chain immunotoxin designed for therapy of human small cell lung cancer.
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| Abstract |
An immunotoxin (IT) comprising abrin A chain attached to the mouse monoclonal antibody SWA11, recognising a cell surface antigen highly associated with human small cell lung cancer (SCLC), was synthesised using a hindered disulphide crosslinker, N-succinimidyl 3-(2-pyridyldithio) butyrate (SPDB), and purified by Blue Sepharose CL-6B affinity chromatography. The IT preparation contained monomeric conjugate, composed of one abrin A chain molecule linked to one SWA11 molecule, and was free from unconjugated A chain or antibody. The IT fully retained the cell-binding capacity of the antibody component and the ribosome-inactivating activity of the A chain. In cytotoxicity assays using the SW2 SCLC cell line in tissue culture, SWA11-SPDB-abrin A chain inhibited the incorporation of 3H-leucine by 50% at a concentration of 10 pM and by 99% at a concentration of 1 nM. The anti-tumour efficacy of the IT was tested in nude mice bearing established s.c. solid SW2 tumour xenografts. A single i.v. injection of SWA11-SPDB-abrin A chain at a non-toxic dose induced a significant 7 to 10 day growth delay that could not be matched by administration of equivalent doses of either unconjugated SWA11 or abrin A chain alone. The results of this study indicate that the antigen recognised by SWA11 is an effective target for therapy of SCLC with A chain ITs in vivo.
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| Authors | E J Wawrzynczak, U Zangemeister-Wittke, R Waibel, R V Henry, G D Parnell, A J Cumber, M Jones, R A Stahel |
| Journal | British journal of cancer (Br J Cancer) Vol. 66 Issue 2 Pg. 361-6 (Aug 1992) ISSN: 0007-0920 [Print] England |
| PMID | 1323991 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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