Preclinical investigation of the antitumour effects of anti-CD19-idarubicin immunoconjugates View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1993-05

AUTHORS

A. J. Rowland, G. A. Pietersz, I. F. C. McKenzie

ABSTRACT

Idarubicin (Ida), an analogue of daunomycin, was linked to a mouse monoclonal antibody against the B cell differentiation antigen CD19. Determination of the activity of both the antibody and drug moieties was carried out in vitro using a pre-B cell human acute lymphoblastic leukaemia cell line (NALM-6). A 23% loss in antibody binding and a 20-fold loss in drug activity were observed upon conjugation. Selective cytotoxicity for CD19+ cells, however, was obtained. Measurement of the cytotoxicity, antibody activity and release of the breakdown product, 14-OH-Ida, showed that the conjugates remained stable for more than 100 days after lyophilization and storage at -20 degrees C. In vivo studies were performed in irradiated nu/nu mice bearing NALM-6 tumours. Initial dose response studies with free idarubicin demonstrated that three i.p. doses (every other day) of 10 micrograms resulted in little antitumour activity, but the death of all the animals by day 23. The same treatment regime using 15 micrograms Ida-anti-CD19 conjugate caused the disappearance of four out of five tumours with three complete cures and no evidence of toxicity as assessed by weight loss. Administration of a conjugate of idarubicin with an irrelevant antibody at this dose led to no significant antitumour response. The administration of free drug at a dose of 6 micrograms resulted in a minor antitumour response but high toxicity, whereas injection of Ida-anti-CD19 conjugate at this dose caused no toxicity and a substantial antitumour effect with eradication of two out of five tumours. These results clearly demonstrate that the administration of Ida-anti-CD19 conjugates can result in complete tumour regression in an experimental model. Idarubicin-containing immunoconjugates should be useful for the treatment of patients with non-Hodgkin's lymphoma. More... »

PAGES

195-202

References to SciGraph publications

Journal

TITLE

Cancer Immunology, Immunotherapy

ISSUE

3

VOLUME

37

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01525435

DOI

http://dx.doi.org/10.1007/bf01525435

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/7687521


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62 schema:description Idarubicin (Ida), an analogue of daunomycin, was linked to a mouse monoclonal antibody against the B cell differentiation antigen CD19. Determination of the activity of both the antibody and drug moieties was carried out in vitro using a pre-B cell human acute lymphoblastic leukaemia cell line (NALM-6). A 23% loss in antibody binding and a 20-fold loss in drug activity were observed upon conjugation. Selective cytotoxicity for CD19+ cells, however, was obtained. Measurement of the cytotoxicity, antibody activity and release of the breakdown product, 14-OH-Ida, showed that the conjugates remained stable for more than 100 days after lyophilization and storage at -20 degrees C. In vivo studies were performed in irradiated nu/nu mice bearing NALM-6 tumours. Initial dose response studies with free idarubicin demonstrated that three i.p. doses (every other day) of 10 micrograms resulted in little antitumour activity, but the death of all the animals by day 23. The same treatment regime using 15 micrograms Ida-anti-CD19 conjugate caused the disappearance of four out of five tumours with three complete cures and no evidence of toxicity as assessed by weight loss. Administration of a conjugate of idarubicin with an irrelevant antibody at this dose led to no significant antitumour response. The administration of free drug at a dose of 6 micrograms resulted in a minor antitumour response but high toxicity, whereas injection of Ida-anti-CD19 conjugate at this dose caused no toxicity and a substantial antitumour effect with eradication of two out of five tumours. These results clearly demonstrate that the administration of Ida-anti-CD19 conjugates can result in complete tumour regression in an experimental model. Idarubicin-containing immunoconjugates should be useful for the treatment of patients with non-Hodgkin's lymphoma.
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