HOXC6 Is transcriptionally regulated via coordination of MLL histone methylase and estrogen receptor in an estrogen environment.
HOXC6 Is transcriptionally regulated via coordination of MLL histone methylase and estrogen receptor in an estrogen environment.
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DOI:
10.1016/j.jmb.2011.05.050
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发表时间:
2011-08-12
影响因子:
5.6
通讯作者:
Mandal SS
中科院分区:
文献类型:
--
作者:
Ansari KI;Hussain I;Shrestha B;Kasiri S;Mandal SS
Homeobox containing gene HOXC6 is a critical player in mammary gland development, milk production and is overexpressed in breast and prostate cancer. We demonstrated that HOXC6 is transcriptionally regulated by estrogen (E2). HOXC6 promoter contains two putative estrogen-response elements (EREs), termed as ERE11/2 and ERE21/2. Promoter analysis using luciferase based reporter assay demonstrated that both EREs are responsive to E2, ERE11/2 being more responsive than ERE21/2. Estrogen receptors, ERα and ERβ, bind to these EREs in an E2-dependent manner and antisense-mediated knockdown of ERs suppressed the E2-dependent activation of HOXC6 expression. Similarly, knockdown of histone methylases, MLL2 and MLL3, decreased E2-mediated activation of HOXC6. However, depletion of MLL1 or MLL4 showed no significant effect. MLL2 and MLL3 were bound to the HOXC6 EREs in an E2-dependent manner. In contrast, MLL1 and MLL4 that were bound to the HOXC6 promoter in the absence of E2, decreased upon exposure to E2. MLL2 and MLL3 play key roles in histone H3K4-trimethylation and recruitment of general transcription factors and RNAP II in the HOXC6 promoter during E2-dependent transactivation. Nuclear receptor corepressors N-CoR and SAFB1 were bound in the HOXC6 promoter in absence of E2 and that binding were decreased upon E2-treatment indicating their critical roles in suppressing HOXC6 gene expression under non-activated condition. Knockdown of either ERα or ERβ abolished E2-dependent recruitment of MLL2 and MLL3 into the HOXC6 promoter demonstrating key roles of ERs in recruitment of these MLLs into HOXC6 promoter. Overall, our studies demonstrated that HOXC6 is an estrogen-responsive gene and histone methylases MLL2 and MLL3, in coordination with ERα and ERβ, transcriptionally regulate HOXC6 in an E2-dependent manner.
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DOI:
10.1111/j.1742-4658.2010.07609.x
发表时间:
2010-04
期刊:
The FEBS journal
影响因子:
--
作者:
Cosgrove MS;Patel A
通讯作者:
Patel A
影响因子:
11.2
作者:
Dreijerink, Koen M. A.;Mulder, Klaas W.;Timmers, H. Th. Marc
通讯作者:
Timmers, H. Th. Marc
影响因子:
9.2
作者:
Ernst, P;Mabon, M;Korsmeyer, SJ
通讯作者:
Korsmeyer, SJ
影响因子:
4.6
作者:
Glaser, S;Schaft, J;Stewart, AF
通讯作者:
Stewart, AF
影响因子:
8.8
作者:
Canaani, E;Nakamura, T;Rozovskaia, T;Smith, S T;Mori, T;Croce, C M;Mazo, A
通讯作者:
Mazo, A