Antibody-targeted photolysis: selective photodestruction of human T-cell leukemia cells using monoclonal antibody-chlorin e6 conjugates.

AUTOR(ES)

Oseroff, A R

RESUMO

Selective in vitro photodestruction of HPB-ALL human T-cell leukemia cells was accomplished using the photosensitizer chlorin e6 coupled through dextran molecules to an anti-T-cell monoclonal antibody (mAb), anti-Leu-1. Conjugates with mAb/chlorin molar ratios as high as 1:36 retained mAb binding activity, and the absorption spectrum and quantum efficiency for singlet oxygen production of bound chlorin (0.7 +/- 0.2) were unchanged from that of the free photosensitizer. Phototoxicity, as measured by a clonogenic assay and by uptake of ethidium bromide, was dependent on the doses of both mAb-chlorin and 630- to 670-nm light, was enhanced by 2H2O, and was observed only in target populations that bound the mAb. Similarly, free chlorin e6 in solution had no photodynamic effect in amounts 100 times more than that carried by the mAb. For this antibody-targeted system, approximately 10(10) molecules of singlet oxygen were necessary to kill a cell.

Documentos Relacionados

• Antibody-targeted photolysis: in vitro studies with Sn(IV) chlorin e6 covalently bound to monoclonal antibodies using a modified dextran carrier.
• Antibody-targeted interleukin 2 stimulates T-cell killing of autologous tumor cells.
• Monoclonal antibody-targeted superantigens: a different class of anti-tumor agents.
• Monoclonal antibody that defines a unique human T-cell leukemia antigen
• Antibody-Targeted Lethal Photosensitization of Porphyromonas gingivalis