A-kinase anchoring protein BIG3 coordinates oestrogen signalling in breast cancer cells
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Approximately 70% of breast cancer cells express oestrogen receptor alpha (ERα). Previous studies have shown that the Brefeldin A-inhibited guanine nucleotide-exchange protein 3–prohibitin 2 (BIG3-PHB2) complex has a crucial role in these cells. However, it remains unclear how BIG3 regulates the suppressive activity of PHB2. Here we demonstrate that BIG3 functions as an A-kinase anchoring protein that binds protein kinase A (PKA) and the α isoform of the catalytic subunit of protein phosphatase 1 (PP1Cα), thereby dephosphorylating and inactivating PHB2. E2-induced PKA-mediated phosphorylation of BIG3-S305 and -S1208 serves to enhance PP1Cα activity, resulting in E2/ERα signalling activation via PHB2 inactivation due to PHB2-S39 dephosphorylation. Furthermore, an analysis of independent cohorts of ERα-positive breast cancers patients reveal that both BIG3 overexpression and PHB2-S39 dephosphorylation are strongly associated with poor prognosis. This is the first demonstration of the mechanism of E2/ERα signalling activation via the BIG3–PKA–PP1Cα tri-complex in breast cancer cells.
収録刊行物
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- Nature Communications
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Nature Communications 8 15427-, 2017-05-30
Springer Nature
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詳細情報 詳細情報について
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- CRID
- 1050564287756278912
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- NII論文ID
- 120006535065
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- NII書誌ID
- AA12645905
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- ISSN
- 20411723
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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