Antibody-radionuclide conjugates as part of a myeloablative preparative regimen for marrow transplantation

Author:

Appelbaum FR1,Brown P1,Sandmaier B1,Badger C1,Schuening F1,Graham T1,Storb R1

Affiliation:

1. Fred Hutchinson Cancer Research Center, Division of Clinical Research, Seattle, WA 98104.

Abstract

Abstract The behaviors of an anti-Ia antibody (7.2) and an antibody directed at a lymphocyte adhesion molecule (S.5) radiolabeled with 131I were studied in normal dogs. Antibody 7.2 localized to spleen and, to a lesser extent, to marrow and lymph nodes. Antibody S.5 rapidly localized to marrow and spleen, achieving tissue/blood ratios greater than 6:1 within three hours of injection that were maintained for at least 48 hours. Prior treatment with cyclophosphamide (CY) markedly altered the distribution of S.5 but had much less effect on the distribution of 7.2 and almost no effect on the distribution of a control antibody. When animals were treated with increasing doses of 131I labeled to S.5, lethal myelosuppression occurred when a dose of 6 mCi/kg was reached. At this dose, the otherwise lethal effects of 131I could be reversed with autologous marrow transplant support.

Publisher

American Society of Hematology

Subject

Cell Biology,Hematology,Immunology,Biochemistry

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