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Singlet oxygen producing photosensitizers in photophoresis. 1997

H P van Iperen, and G M Beijersbergen van Henegouwen
Leiden/Amsterdam Centre for Drug Research, Department of Medicinal Photochemistry, Netherlands. iperenh@chem.leidenuniv.nl

In this study, the immunosuppressive properties of two photosensitizers (benzoporphyrin derivative monoacid ring A (BPD) and Photofrin (HPD)), used for the photodynamic therapy of cancer, were investigated. The investigations were performed in our rat model for photophoresis. The validity of this model has been amply demonstrated. It enables a distinction to be made between antigen-specific and antigen non-specific immune suppression. With this model, the immune response which can be specifically suppressed is the contact hypersensitivity (CHS). CHS is induced by 2,4-dinitrofluorobenzene (DNFB). Both BPD and HPD are able to suppress CHS induced by DNFB. Furthermore, this generated suppression is transferable by the spleen cells of treated animals and is antigen non-specific.

UI MeSH Term Description Entries
D007166 Immunosuppressive Agents Agents that suppress immune function by one of several mechanisms of action. Classical cytotoxic immunosuppressants act by inhibiting DNA synthesis. Others may act through activation of T-CELLS or by inhibiting the activation of HELPER CELLS. While immunosuppression has been brought about in the past primarily to prevent rejection of transplanted organs, new applications involving mediation of the effects of INTERLEUKINS and other CYTOKINES are emerging. Immunosuppressant,Immunosuppressive Agent,Immunosuppressants,Agent, Immunosuppressive,Agents, Immunosuppressive
D008297 Male Males
D010100 Oxygen An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration. Dioxygen,Oxygen-16,Oxygen 16
D010853 Picryl Chloride A hapten that generates suppressor cells capable of down-regulating the efferent phase of trinitrophenol-specific contact hypersensitivity. (Arthritis Rheum 1991 Feb;34(2):180). 2,4,6-Trinitro-1-chlorobenzene,1-Chloro-2,4,6-trinitrobenzene,Trinitrochlorobenzene,Chloride, Picryl
D011166 Porphyrins A group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached. The nature of the side chain is indicated by a prefix, as uroporphyrin, hematoporphyrin, etc. The porphyrins, in combination with iron, form the heme component in biologically significant compounds such as hemoglobin and myoglobin. Porphyrin
D003877 Dermatitis, Contact A type of acute or chronic skin reaction in which sensitivity is manifested by reactivity to materials or substances coming in contact with the skin. It may involve allergic or non-allergic mechanisms. Contact Dermatitis,Dermatitis Venenata,Eczema, Contact,Hypersensitivity, Contact,Sensitivity, Contact,Contact Dermatitides,Contact Eczema,Contact Hypersensitivities,Contact Hypersensitivity,Contact Sensitivities,Contact Sensitivity,Dermatitides, Contact,Hypersensitivities, Contact,Sensitivities, Contact
D004139 Dinitrofluorobenzene Irritants and reagents for labeling terminal amino acid groups. DNFB,Fluorodinitrobenzene,1-Fluoro-2,4-dinitrobenzene,1 Fluoro 2,4 dinitrobenzene
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000917 Antibody Formation The production of ANTIBODIES by proliferating and differentiated B-LYMPHOCYTES under stimulation by ANTIGENS. Antibody Production,Antibody Response,Antibody Responses,Formation, Antibody,Production, Antibody,Response, Antibody,Responses, Antibody
D017208 Rats, Wistar A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain. Wistar Rat,Rat, Wistar,Wistar Rats

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