Research Project
Grant-in-Aid for Scientific Research (C)
The proneural basic-helix-loop-helix protein achaete-scute homologue 1(ASH1) is expressed in a very limited spectrum in a lineage-specific manner, including normal pulmonary neuroendocrine cells and lung cancer cells with neuroendocrine features. Our previous results indicated that ASH1 may play a crucial role in the growth and survival of lung cancers with neuroendocrine features. In the present study, we report for the first time that ASH1 functions as a dual transcription factor by activating neuroendocrine differentiation markers and also repressing putative tumor suppressors. This protein was found to inactivate DKK1 and DKK3, negative regulators of Wnt/β-catenin signaling, E-cadherin, and integrinβ1 through ASH 1-mediated deacetylation and repressive trimethylation of lysine 27(H3K27me3) of histone H3 in the promoter regions of DKK1 and E-cadherin. Our results provide important clues for a better understanding of the molecular and cellular biological roles of ASH1 in the process … More of carcinogenesis of lung cancers with neuroendocrine features and warrant future investigations to shed light on the lineage-specific dependency of this transcription factor with dual functions.We previously reported the amplification and overexpression of the miR-17-92 microRNAs(miRNA) cluster at 13q31.3 in lung cancers. In the present study, we show that inhibition of miR-17-5p and miR-20a with antisense oligonucleotides can induce apoptosis selectively in lung cancer cells overexpressing miR-17-92, suggesting the possibility of 'OncomiR addiction' to expression of these miRNAs in a subset of lung cancers. During the course of this study, we also found that enforced expression of a genomic region, termed C2, residing 3' to miR-17-92 in the intron 3 of C13orf25 led to marked growth inhibition in association with double stranded RNA-dependent protein kinase activation. Taken together, the present findings contribute towards better understanding of the oncogenic roles of miR-17-92, which might ultimately lead to the future translation into clinical applications. Less
All 2008 2007 2006 Other
All Journal Article (41 results) (of which Peer Reviewed: 17 results) Presentation (18 results) Remarks (2 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 1 results)
Cancer Research 68
Pages: 1647-55
Cancer Res 68
Carcinogenesis 28
Pages: 2-12
Oncogene 26
Pages: 4025-31
Pages: 4600-8
Pages: 6099-6105
Int.J.Cancer 120
Pages: 543-551
Mol.Cell.Biol 27
Pages: 2003-13
Cancer Research 67
Pages: 11158-65
Hepatol Research 37
Pages: 974-983
Pages: 6007-6011
Pages: 4025-4031
Pages: 4600-4608
Int J Cancer. 120
Pages: 543-51
Mol. Cell. Biol 27
Cancer Res 67
Pages: 11158-11165
Hepatol Res 37
10019773990
Int. J. Cancer 120
Oncogene (in press)
Molecular and Cellular Biology 27・6
International Journal of Cancer 120・3
Carcinogenesis 28・1
J Clin Oncol 24
Pages: 1679-1688
Oncogene 25
Pages: 271-277
Cancer Science 97
Pages: 753-759
Proc Natl Acad Sci USA. 103
Pages: 16894-9
Pages: 271-7
Cancer Sci 97
Pages: 753-9
Proc Natl Acad Sci U S A. 103
Proc Natl Acad Sci U S A. 103(45)
Cancer Science 97・8
Journal of Clinical Oncology 24・11
Pages: 1679-88
Oncogene 25・2
http://www.pref.aichi.jp/cancer-center/400/420/421/421-03.html