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Apoptosis induced by chemotherapeutic agents involves c‐Jun N‐terminal kinase activation in sarcoma cell lines
Author(s) -
Koyama Takaaki,
Mikami Takashi,
Koyama Takashi,
Imakiire Atsuhiro,
Yamamoto Kengo,
Toyota Hiroko,
Mizuguchi Junichiro
Publication year - 2006
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.20176
Subject(s) - apoptosis , annexin , kinase , programmed cell death , mapk/erk pathway , doxorubicin , cisplatin , cancer research , cell culture , flow cytometry , p38 mitogen activated protein kinases , microbiology and biotechnology , chemistry , biology , chemotherapy , biochemistry , genetics
Molecular mechanisms underlying chemotherapeutic agent–induced apoptosis in sarcoma cells are not well known. Induction of apoptosis is regulated by several components including mitogen‐activated protein kinases (MAPKs) comprising ERK, p38MAPKs, and c‐Jun N‐terminal kinase (JNK). In the present study, we examined whether activation of JNK is induced by the chemotherapeutic agents cis ‐diaminedichloroplatinum (cisplatin, CDDP) or doxorubicin (DXR), and whether the ectopic expression of constitutively active (MKK7‐JNK1) or dominant‐negative form of JNK (dnJNK) influenced apoptosis in response to the CDDP or DXR in sarcoma cell lines MG‐63 and SaOS‐2. The CDDP or DXR induced JNK activation in the both cell lines, as assessed by Western blotting using phosphospecific antibodies. A transient expression of the activated form of JNK sensitized the MG‐63 and SaOS‐2 cells to the drug‐induced apoptosis, while dnJNK1 reduced the proportion of apoptotic cell death. Apoptosis was determined by flow cytometry using annexin‐V Cy5. Collectively, our results indicate that JNK activation is involved in apoptotic cell death in sarcoma cell lines following stimulation with CDDP or DXR. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 24:1153–1162, 2006