title: Involvement of ERK1/2 and p38 MAP kinase in doxorubicin-induced uPA expression in human RC-K8 lymphoma and NCI-H69 small cell lung carcinoma cells.
abstract: We previously demonstrated the doxorubicin-induced urokinase-type plasminogen activator (uPA) expression in human RC-K8 lymphoma cells and NCI-H69 small cell lung carcinoma cells in which reactive oxygen species might be involved. Western blotting analysis revealed phosphorylation/activation of mitogen-activated protein (MAP) kinases, such as extracellular signal-regulated kinase (ERK) 1/2, p38 MAP kinase and stress-activated protein kinase/c-jun N-terminal protein kinase (SAPK/JNK) in doxorubicin-treated RC-K8 and H69 cells, and, therefore, we attempted to identify the MAP kinases implicated in doxorubicin-induced uPA expression by the use of their specific inhibitors. U0126, SB202190 and JNKI-1, inhibitors for MAPK kinase, (MEK) 1/2, p38 MAP kinase and SAPK/JNK, respectively, specifically and clearly inhibited their corresponding kinases. U0126 and SB202190, but not JNKI-1, almost completely inhibited the doxorubicin-induced uPA expression in both RC-K8 and H69 cells. However, U0126 rather enhanced the doxorubicin-induced activation of caspase-3 and poly ADP-ribose polymerase (PARP), and U0126 itself activated caspase-3 and PARP. Interestingly, JNKI-1 inhibited the doxorubicin-induced activation of caspase-3 and PARP. Therefore, doxorubicin treatment activates the above three kinases, but different MAP kinase signaling is responsible in the doxorubicin-induced caspase activation and expression of uPA. Thus, we could possibly manipulate the direction of doxorubicin-induced MAP kinase activation and the effects of doxorubicin on the tumor cell biology by the use of MAP kinase inhibitors.
authors.affiliation: Department of Medicine II, Faculty of Medicine, Okayama University Medical School, Okayama, Japan. mniiya@med.okayama-u.ac.jp
authors.forename: Masami
authors.initials: M
authors.lastname: Niiya
authors.forename: Kenji
authors.initials: K
authors.lastname: Niiya
authors.forename: Misako
authors.initials: M
authors.lastname: Shibakura
authors.forename: Noboru
authors.initials: N
authors.lastname: Asaumi
authors.forename: Chikamasa
authors.initials: C
authors.lastname: Yoshida
authors.forename: Katsuji
authors.initials: K
authors.lastname: Shinagawa
authors.forename: Takanori
authors.initials: T
authors.lastname: Teshima
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Ishimaru
authors.forename: Kazuma
authors.initials: K
authors.lastname: Ikeda
authors.forename: Mitsune
authors.initials: M
authors.lastname: Tanimoto
mesh_terms: D015152:Blotting, Northern; D015153:Blotting, Western; D002070:Butadienes / Q000494:pharmacology; D018288:Carcinoma, Small Cell / Q000201:enzymology / Q000378:metabolism*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D045744:Cell Line, Tumor; D004317:Doxorubicin / Q000494:pharmacology*; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D008175:Lung Neoplasms / Q000378:metabolism; D008223:Lymphoma / Q000201:enzymology / Q000378:metabolism*; D048670:MAP Kinase Kinase 4 / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism*; D048055:Mitogen-Activated Protein Kinase 8 / Q000378:metabolism; D009570:Nitriles / Q000494:pharmacology; D010766:Phosphorylation; D011064:Poly Adenosine Diphosphate Ribose / Q000378:metabolism; D011725:Pyridines / Q000494:pharmacology; D014568:Urokinase-Type Plasminogen Activator / Q000187:drug effects / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D002070:Butadienes; D004791:Enzyme Inhibitors; D007093:Imidazoles; D009570:Nitriles; D011725:Pyridines; C113580:U 0126; D011064:Poly Adenosine Diphosphate Ribose; D004317:Doxorubicin; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048055:Mitogen-Activated Protein Kinase 8; D048051:p38 Mitogen-Activated Protein Kinases; D048670:MAP Kinase Kinase 4; D014568:Urokinase-Type Plasminogen Activator; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases; C090942:4-(4-fluorophenyl)-2-(4-hydroxyphenyl)-5-(4-pyridyl)imidazole