Abstract:
:Malignant mesothelioma is an aggressive tumor of serosal surfaces, which is refractory to current treatment options. Arsenic trioxide (As2O3) is used clinically to treat acute promyelocytic leukemia, and also to inhibit proliferation of several solid tumors including hepatoma, esophageal, and gastric cancer in vitro. Here we found that As2O3 inhibited cell viability of a mesothelioma cell line, NCI-H2052. As2O3 induced apoptosis of NCI-H2052 cells, which was accompanied by activation of c-Jun NH2-terminal kinase (JNK)1/2, extracellular signal-regulated kinase (ERK)1/2, and caspase-3. zVAD-fmk, a broad-spectrum caspase inhibitor, inhibited As2O3-induced apoptosis and activation of caspase-3, but not that of JNK1/2 and ERK1/2. Small interfering RNAs (siRNAs) targeting JNK1/2 suppressed As2O3-induced caspase-3 activation and apoptosis, indicating that JNK1/2 regulate As2O3-induced apoptosis though caspase cascade. Furthermore, JNK1 siRNA abrogated As2O3-induced JNK2 phosphorylation and JNK2 siRNA abrogated As2O3-induced JNK1 phosphorylation, suggesting that JNK1 and JNK2 interact with each other. Moreover, JNK1 siRNA, but not JNK2 siRNA, abrogated As2O3-induced ERK1/2 phosphorylation. JNK2 siRNA together with PD98059, a specific MAPK/ERK kinase inhibitor, suppressed As2O3-induced apoptosis more significantly than JNK2 siRNA alone. These results indicated that As2O3 induces apoptosis of NCI-H2052 cells mainly through JNK1/2 activation, and that ERK1/2 is involved in As2O3-induced apoptosis when JNK1/2 are inactivated.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Eguchi R,Fujimori Y,Takeda H,Tabata C,Ohta T,Kuribayashi K,Fukuoka K,Nakano Tdoi
10.1002/jcp.22397subject
Has Abstractpub_date
2011-03-01 00:00:00pages
762-8issue
3eissn
0021-9541issn
1097-4652journal_volume
226pub_type
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