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Apoptosis induced by chemotherapeutic agents involves c-Jun N-terminal kinase activation in sarcoma cell lines

✍ Scribed by Takaaki Koyama; Takashi Mikami; Takashi Koyama; Atsuhiro Imakiire; Kengo Yamamoto; Hiroko Toyota; Junichiro Mizuguchi

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
306 KB
Volume
24
Category
Article
ISSN
0736-0266

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✦ Synopsis

Abstract

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

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