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PRODUCTS OF PSORALEN PHOTOOXIDATION POSSESS IMMUNOMODULATIVE AND ANTILEUKEMIC EFFECTS *
Author(s) -
POTAPENKO A. YA.,
KYAGOVA A. A.,
BEZDETNAYA L. N.,
LYSENKO E. P.,
Chernyakhovskaya I. Yu.,
Bekhalo V. A.,
Nagurskaya E. V.,
Nesterenko V. A.,
Korotky N. G.,
Akhtyamov S. N.,
Lanshchikova T. M.
Publication year - 1994
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1994.tb05086.x
Subject(s) - psoralen , chemistry , thermolabile , sensitization , biological activity , hairless , pharmacology , lymphoma , dna , oxygen , subcutaneous injection , dna synthesis , puva therapy , biochemistry , immunology , in vitro , medicine , organic chemistry , psoriasis , enzyme
It has been proposed that the therapeutic effect of PUVA (psoralens + UVA radiation) is connected to its immunomodulative properties, and that the molecular basis of such properties is the oxygen‐independent pho‐toaddition of psoralens to DNA. We have investigated effects of preliminary photooxidized psoralens (POP) on the delayed‐type hypersensitivity reaction (DTH) to sheep red blood cells and on growth of grafted T‐cell lymphoma EL‐4 in mice. We have shown that intravenous injection of POP at low concentrations activated, and at high concentrations suppressed, DTH. The POP products are thermolabile. They preserved their immunosuppressive activity for 3 days at room temperature and lost it in several min at 58°C. Incubation of POP in the presence of Fe 2+ during 2 h before intravenous injection leads to complete loss of its immunomodulative activity, suggesting a peroxidic nature of POP products. The POP‐inhibited growth of grafted T‐cell lymphoma independent of the mode of POP application in mice (intravenous or subcutaneous injections, oral or nasal administration). Our data suggest that photooxidative reactions of psoralens, in addition to oxygen‐independent photoaddition to DNA, form the basis for biological activity of these drugs.