An immunotoxin composed of monoclonal anti-Thy 1.1 antibody and a ribosome-inactivating protein from Saponaria officinalis: Potent antitumor effects in vitro and in vivo

P. E. Thorpe, A. N F Brown, J. A G Bremner, B. M. Foxwell, F. Stirpe

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Abstract

The ribosome-inactivating protein saporin, from Saponaria officinalis, was coupled by a disulfide bond to monoclonal anti-Thy 1.1 antibody (OX7) and to its F(ab')2 fragment. The immunotoxins were at least as toxic as the plant toxin ricin to the Thy 1.1-expressing cell lines AKR-A and BW5147 in tissue culture. They reduced the rate at which the cells incorporated [3H]leucine into protein by 50% at cell concentrations of 1.5-3x10-11 and 3x10-12M, respectively. The toxic effect was specific. No toxicity was seen when the immunotoxins were applied to Thy 1.2-expressing EL 4 lymphoma cells at 3x10-8 M, and a control immunotoxin made from an antibody (R10) of irrelevant specificity was without effect on AKR-A cells. Further, the treatment of spleen cells from AKR mice with OX7-saporin at 10-8 M abolished their response to the T-lymphocyte mitogen concanavalin A, without impairing their response to the B-lymphocyte mitogen lipopolysaccharide. A single iv injection of OX7-saporin into nu/nu randombred mice bearing peritoneal AKR-A lymphoma cells prolonged the survival time of the animals by an extent corresponding to that expected if 99.999% of the tumor cells had been eradicated by the immunotoxin. None of the control materials (unconjugated OX7, unconjugated saporin, OX7 plus saporin, or R10-saporin) delayed tumor growth. The OX7 F(ab')2-saporin conjugate was also highly effective as an antitumor agent, although significantly less so than the conjugate made with intact OX7. Unexpectedly, the acute toxicity of saporin to mice (median lethal dose = 6.8 mg/kg) was elevated eightfold to sixteenfold by conjugation to OX7, R10, or OX7 F(ab')2. Histologic examination of recipients of the immunotoxin revealed gross damage to hepatic parenchymal cells and to the white pulp of the spleen, neither of which was caused by unconjugated saporin. Ricin A-chain coupled to OX7 antibody was one hundredfold to one thousandfold less effective than OX7-saporin as an antitumor agent in vivo, although the two immunotoxins were equally cytotoxic to AKR-A cells in vitro.

Original languageEnglish (US)
Pages (from-to)151-159
Number of pages9
JournalJournal of the National Cancer Institute
Volume75
Issue number1
StatePublished - 1985

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Saponaria
Ribosome Inactivating Proteins
Immunotoxins
Ricin
Mitogens
Antineoplastic Agents
Lymphoma
Spleen
Toxic Plants
Inbred AKR Mouse
Antibodies
Poisons
Concanavalin A
In Vitro Techniques
anti-Thy antibody
Leucine
Disulfides
Lipopolysaccharides
Hepatocytes
Neoplasms

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

An immunotoxin composed of monoclonal anti-Thy 1.1 antibody and a ribosome-inactivating protein from Saponaria officinalis : Potent antitumor effects in vitro and in vivo. / Thorpe, P. E.; Brown, A. N F; Bremner, J. A G; Foxwell, B. M.; Stirpe, F.

In: Journal of the National Cancer Institute, Vol. 75, No. 1, 1985, p. 151-159.

Research output: Contribution to journalArticle

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abstract = "The ribosome-inactivating protein saporin, from Saponaria officinalis, was coupled by a disulfide bond to monoclonal anti-Thy 1.1 antibody (OX7) and to its F(ab')2 fragment. The immunotoxins were at least as toxic as the plant toxin ricin to the Thy 1.1-expressing cell lines AKR-A and BW5147 in tissue culture. They reduced the rate at which the cells incorporated [3H]leucine into protein by 50{\%} at cell concentrations of 1.5-3x10-11 and 3x10-12M, respectively. The toxic effect was specific. No toxicity was seen when the immunotoxins were applied to Thy 1.2-expressing EL 4 lymphoma cells at 3x10-8 M, and a control immunotoxin made from an antibody (R10) of irrelevant specificity was without effect on AKR-A cells. Further, the treatment of spleen cells from AKR mice with OX7-saporin at 10-8 M abolished their response to the T-lymphocyte mitogen concanavalin A, without impairing their response to the B-lymphocyte mitogen lipopolysaccharide. A single iv injection of OX7-saporin into nu/nu randombred mice bearing peritoneal AKR-A lymphoma cells prolonged the survival time of the animals by an extent corresponding to that expected if 99.999{\%} of the tumor cells had been eradicated by the immunotoxin. None of the control materials (unconjugated OX7, unconjugated saporin, OX7 plus saporin, or R10-saporin) delayed tumor growth. The OX7 F(ab')2-saporin conjugate was also highly effective as an antitumor agent, although significantly less so than the conjugate made with intact OX7. Unexpectedly, the acute toxicity of saporin to mice (median lethal dose = 6.8 mg/kg) was elevated eightfold to sixteenfold by conjugation to OX7, R10, or OX7 F(ab')2. Histologic examination of recipients of the immunotoxin revealed gross damage to hepatic parenchymal cells and to the white pulp of the spleen, neither of which was caused by unconjugated saporin. Ricin A-chain coupled to OX7 antibody was one hundredfold to one thousandfold less effective than OX7-saporin as an antitumor agent in vivo, although the two immunotoxins were equally cytotoxic to AKR-A cells in vitro.",
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