Photo-immunotargeting with haematoporphyrin conjugates activated by a low-power He-Ne laser |
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Authors: | Timea Berki Péter Németh |
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Affiliation: | (1) Immunological and Biotechnological Laboratory, University Medical School of Pécs, Szigeti ut 12, H-7643 Pécs, Hungary |
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Abstract: | Summary A combined method has been developed for selective cytolysis in vitro as well as in vivo using a photosensitizer haematoporphyrin-protein conjugate as the targeting molecule and low-power He-Ne laser (632.8 nm) irradiation in order to activate the sensitizer to its excited, toxic triplet energy state. The specificity of the procedure was demonstrated in vitro by purging a mixed cell population from one component, and in vivo in an animal (nude mice) xenograft tumour model, where human cancer cells were destroyed by the immunotargeting method using monoclonal-antibody-haematoporphyrin (mAb-HP) conjugate (a-PNAr-I mAbs, which bind to the cell surface antigens of gastric cancer cells) and soft laser irradiation. The cell destruction was dependent on the doses of both mAb-HP and He-Ne laser light energy, and occurred only in target cell populations. |
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Keywords: | Photosensitization Immunotargeting He-Ne laser Haematoporphyrin conjugates |
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