| Literature DB >> 28609657 |
Kiran Mahajan1, Pavani Malla2, Harshani R Lawrence3, Zhihua Chen4, Chandan Kumar-Sinha5, Rohit Malik5, Sudhanshu Shukla5, Jongphil Kim6, Domenico Coppola7, Nicholas J Lawrence8, Nupam P Mahajan9.
Abstract
The androgen receptor (AR) is critical for the progression of prostate cancer to a castration-resistant (CRPC) state. AR antagonists are ineffective due to their inability to repress the expression of AR or its splice variant, AR-V7. Here, we report that the tyrosine kinase ACK1 (TNK2) phosphorylates histone H4 at tyrosine 88 upstream of the AR transcription start site. The WDR5/MLL2 complex reads the H4-Y88-phosphorylation marks and deposits the transcriptionally activating H3K4-trimethyl marks promoting AR transcription. Reversal of the pY88-H4 epigenetic marks by the ACK1 inhibitor (R)-9bMS-sensitized naive and enzalutamide-resistant prostate cancer cells and reduced AR and AR-V7 levels to mitigate CRPC tumor growth. Thus, a feedforward ACK1/pY88-H4/WDR5/MLL2/AR epigenetic circuit drives CRPC and is necessary for maintenance of the malignant state.Entities:
Keywords: ACK1; AR; AR-V7; TNK2; castration resistance; enzalutamide; epigenetics; histone; prostate cancer; small-molecule inhibitor; tyrosine phosphorylation
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Year: 2017 PMID: 28609657 PMCID: PMC5512571 DOI: 10.1016/j.ccell.2017.05.003
Source DB: PubMed Journal: Cancer Cell ISSN: 1535-6108 Impact factor: 31.743