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Stimulation of ultraviolet‐induced apoptosis of human fibroblast UV r ‐1 cells by tyrosine kinase inhibitors
Author(s) -
Hiwasa Takaki,
Arase Yoshiko,
Chen Zheng,
Kita Kazuko,
Umezawa Kazuo,
Ito Hisao,
Suzuki Nobuo
Publication year - 1999
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(99)00057-5
Subject(s) - tyrosine kinase , kinase , phosphorylation , receptor tyrosine kinase , lyn , chemistry , biology , signal transduction , biochemistry , microbiology and biotechnology
Damnacanthal is an anthraquinone compound isolated from the root of Morinda citrifolia and was reported to have a potent inhibitory activity towards tyrosine kinases such as Lck, Src, Lyn and EGF receptor. In the present study, we have examined the effects of damnacanthal on ultraviolet ray‐induced apoptosis in ultraviolet‐resistant human UV r ‐1 cells. When the cells were treated with damnacanthal prior to ultraviolet irradiation, DNA fragmentation was more pronounced as compared to the case of ultraviolet irradiation alone. The other tyrosine kinase inhibitors, herbimycin A and genistein, also caused similar effects on ultraviolet‐induced apoptosis but to a lesser extent. Serine/threonine kinase inhibitors, K252a, staurosporine and GF109203X, rather suppressed the ultraviolet‐induced DNA cleavage. Immunoblot analysis showed that pretreatment with damnacanthal followed by ultraviolet irradiation increased the levels of phosphorylated extracellular signal‐regulated kinases and stress‐activated protein kinases. However, the other tyrosine kinase inhibitors did not increase the phosphorylation of extracellular signal‐regulated kinases but stimulated phosphorylation of stress‐activated protein kinases. Consequently, the ultraviolet‐induced concurrent increase in both phosphorylated extracellular signal‐regulated kinases and stress‐activated protein kinases after pretreatment with damnacanthal might be characteristically related to the stimulatory effect of damnacanthal on ultraviolet‐induced apoptosis.