Vitamin D receptor ligands, adenomatous polyposis coli, and the vitamin D receptor FokI polymorphism collectively modulate beta-catenin activity in colon cancer cells.
Vitamin D receptor ligands, adenomatous polyposis coli, and the vitamin D receptor FokI polymorphism collectively modulate beta-catenin activity in colon cancer cells.
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DOI:
10.1002/mc.20603
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发表时间:
2010-04
影响因子:
4.6
通讯作者:
Jurutka, Peter W.
中科院分区:
文献类型:
--
作者:
Egan, Jan B.;Thompson, Patricia A.;Vitanov, Milen V.;Bartik, Leonid;Jacobs, Elizabeth T.;Haussler, Mark R.;Gerner, Eugene W.;Jurutka, Peter W.
关键词:
The activity of β-catenin, commonly dysregulated in human colon cancers, is inhibited by the vitamin D receptor (VDR), and this mechanism is postulated to explain the putative anti-cancer activity of vitamin D metabolites in the colon. We investigated the effect of a common FokI restriction site polymorphism (F/f) in the human VDR gene as well as the effect of anti-tumorigenic 1,25-dihydroxyvitamin D3 (1,25D) and pro-tumorigenic lithocholic acid (LCA) VDR ligands on β-catenin transcriptional activity. Furthermore, the influence of a major regulatory protein of β-catenin, the APC tumor suppressor gene, on VDR-dependent inhibition of β-catenin activity was examined. We report herein that β-catenin-mediated transcription is most effectively suppressed by the VDR FokI variant F/M4 when 1,25D is limiting. Using Caco-2 colorectal cancer cells, it was observed that VDR ligands, 1,25D and LCA, both suppress β-catenin transcriptional activity, though 1,25D exhibited significantly greater inhibition. Moreover, 1,25D, but not LCA, suppressed endogenous expression of the β-catenin target gene DKK-4 independent of VDR DNA-binding activity. These results support β-catenin sequestration away from endogenous gene targets by 1,25D-VDR. This activity is most efficiently mediated by the FokI gene variant F/M4, a VDR allele previously associated with protection against colorectal cancer. Interestingly, we found the inhibition of β-catenin activity by 1,25D-VDR was significantly enhanced by wildtype APC. These results reveal a previously unrecognized role for 1,25D-VDR in APC/β-catenin cross-talk. Collectively, these findings strengthen evidence favoring a direct effect on the Wnt-signaling molecule β-catenin as one anti-cancer target of 1,25D-VDR action in the colorectum.
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影响因子:
6.4
作者:
HULLA, W;KALLAY, E;CROSS, HS
通讯作者:
CROSS, HS
DOI:
10.1080/15287390701798685
发表时间:
2008-01-01
影响因子:
2.6
作者:
Karami, S.;Brennan, P.;Moore, L. E.
通讯作者:
Moore, L. E.
影响因子:
4.8
作者:
Jiménez-Lara, AM;Aranda, A
通讯作者:
Aranda, A
影响因子:
4.8
作者:
HALLINE, AG;DAVIDSON, NO;BRASITUS, TA
通讯作者:
BRASITUS, TA
DOI:
10.1093/jnci/djg110
发表时间:
2003-12-03
期刊:
JOURNAL OF THE NATIONAL CANCER INSTITUTE
影响因子:
--
作者:
Grau, MV;Baron, JA;Heber, D
通讯作者:
Heber, D