Abstract:
:Numerous studies show that nonsteroidal anti-inflammatory drugs (NSAIDs) are effective in chemoprevention or treatment of cancer. Nevertheless, the mechanisms underlying these antineoplastic effects remain poorly understood. Here, we report that induction of the cancer-specific proapoptotic cytokine melanoma differentiation associated gene-7/interleukin-24 (MDA-7/IL-24) by several NSAIDs is an essential step for induction of apoptosis and G(2)-M growth arrest in cancer cells in vitro and inhibition of tumor growth in vivo. We also show that MDA-7/IL-24-dependent up-regulation of growth arrest and DNA damage inducible 45 alpha (GADD45alpha) and GADD45gamma gene expression is sufficient for cancer cell apoptosis via c-Jun NH(2)-terminal kinase (JNK) activation and growth arrest induction through inhibition of Cdc2-cyclin B checkpoint kinase. Knockdown of GADD45alpha and GADD45gamma transcription by small interfering RNA abrogates apoptosis and growth arrest induction by the NSAID treatment, blocks JNK activation, and restores Cdc2-cyclin B kinase activity. Our results establish MDA-7/IL-24 and GADD45alpha and GADD45gamma as critical mediators of apoptosis and growth arrest in response to NSAIDs in cancer cells.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Zerbini LF,Czibere A,Wang Y,Correa RG,Otu H,Joseph M,Takayasu Y,Silver M,Gu X,Ruchusatsawat K,Li L,Sarkar D,Zhou JR,Fisher PB,Libermann TAdoi
10.1158/0008-5472.CAN-06-2068subject
Has Abstractpub_date
2006-12-15 00:00:00pages
11922-31issue
24eissn
0008-5472issn
1538-7445pii
66/24/11922journal_volume
66pub_type
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