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Journal of Biochemistry Advance Access published online on July 27, 2006
Journal of Biochemistry, doi:10.1093/jb/mvj167
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© 2006 The Japanese Biochemical Society.
Received February 17, 2006
Accepted July 19, 2006

Regular Paper

AIB1 Promotes DNA Replication by JNK Repression and AKT Activation during Cellular Stress

Kikumi Horiguchi 1, Shigeki Arai 2, Tsutomu Nishihara 1, and Jun-ich Nishikawa 1 *

1 Laboratory of Environmental Biochemistry, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871
2 Laboratory of Environmental Biochemistry, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871; Present address: Research Center for Genomic Medicine, Saitama Medical School, 1397-1 Yamane, Hidaka-shi, Saitama 350-1241

* To whom correspondence should be addressed.
Jun-ich Nishikawa, E-mail: nisikawa{at}phs.osaka-u.ac.jp


  Abstract

Amplified in breast cancer 1 (AIB1) is a member of the p160 family of nuclear receptor coactivator protein. Recent studies have reported that high-level AIB1 production is involved in the phosphoinositide 3-kinase (PI3K)/Akt signaling pathway for progression to malignant carcinoma in a steroid-independent manner. Here we demonstrate that, in AIB1-knockout DT40 chicken B-lymphocytes, loss of AIB1 results in induction of phosphorylation of c-Jun N-terminal kinase (JNK) and c-Jun, in addition to the inhibition of DNA replication. In contrast, high-level AIB1 production prevents proapoptotic activation of the JNK/c-Jun signal transduction pathway and induces DNA replication through phosphorylation of the Akt/p65 NF-{kappa}B subunit RelA under cellular stresses such as UV irradiation or serum deprivation. Moreover, we have found that AIB1 is essential for the phosphorylation of histone H3 at serine 10, which is associated with the signal transduction to chromatin, leading to the transient expression of immediate-early genes in response to UV stimulation. Our results therefore suggest that AIB1 directly links to cell cycle control mechanisms in concern with the balance between apoptosis and proliferation.

Keywords: amplified in breast cancer 1; cellular stress; DNA replication; phosphorylation; signal transduction.
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