title: 4,5-Dimethylangelicin effects on lymphocytes with and without UV-radiation.
abstract: Compared to the linear derivative 8-methoxypsoralen (8-MOP) the angular structured furocoumarin 4,5'-dimethylangelicin (4,5'-DMA) causes smaller photosensitization effects (loss of viability, inhibition of phytohemagglutinin (PHA)-induced transformation rate and E-rosette formation of T-cells, respectively) on cultured human lymphocytes. When 4,5'-DMA or 8-MOP are added to the cultures without additional UV-irradiation, increased or decreased PHA-stimulation rates are observed, respectively. In addition, 4,5'-DMA is able to reduce the binding of sheep erythrocytes to lymphocytes in a higher degree than 8-MOP. These findings suggest different action mechanisms on cytoplasma membranes and intracellular structures of lymphocytes by different furocoumarins.
mesh_terms: D000818:Animals; D011564:Furocoumarins / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000187:drug effects* / Q000528:radiation effects; D008730:Methoxsalen / Q000494:pharmacology; D010777:Photochemistry; D010835:Phytohemagglutinins / Q000494:pharmacology; D012397:Rosette Formation; D012756:Sheep; D014466:Ultraviolet Rays
chemical_list: D011564:Furocoumarins; D010835:Phytohemagglutinins; C021665:4,5'-dimethylangelicin; D008730:Methoxsalen