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. 1992 Sep;89(3):341–346. doi: 10.1111/j.1365-2249.1992.tb06959.x

A comparison of anti-lymphocyte immunotoxins containing different ribosome-inactivating proteins and antibodies.

A Bolognesi 1, P L Tazzari 1, C Tassi 1, G Gromo 1, M Gobbi 1, F Stirpe 1
PMCID: PMC1554454  PMID: 1516253

Abstract

Immunotoxins were prepared with several single-chain ribosome-inactivating proteins (RIPs type 1) and with the A-chain of ricin linked to the F(ab')2 fragment of sheep anti-mouse IgG. The cytotoxic activity of these conjugates was tested on human lymphocytes pretreated with an anti-CD3 murine MoAb. The immunotoxins inhibited DNA synthesis in phytohaemagglutinin (PHA)-stimulated lymphocytes with IC50S (concentrations causing 50% inhibition) ranging from 8.9 x 10(-13) to 5.7 x 10(-11) M (immunotoxins containing dianthin 32, saporin, pokeweed antiviral protein from seeds (PAP-S), bryodin, momordin, momorcochin, and trichokirin), 1 x 10(-8) M (immunotoxin containing gelonin) and 5 x 10(-9) M (immunotoxin containing ricin A-chain). The immunotoxin containing saporin linked to the anti-mouse IgG F(ab')2 fragment was also highly toxic to human lymphocytes pretreated with anti-CD2, -CD3, -CD5 and -CD45 MoAbs, with IC50S less than or equal to 10(-11) M. Immunotoxins were prepared also with saporin linked to MoAbs against various CD antigens. The immunotoxin prepared with the anti-CD3 antibody had the highest specific cytotoxicity to human lymphocytes.

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Selected References

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