Much of our general understanding of coactivator function stems from characterizations of the p160/Steroid Receptor Coactivator (SRC) family of coregulators, which comprises SRC-1, -2, and -3 full length (SRC-3FL). Our prior work revealed that coactivators are controlled by a complex posttranslational modification (PTM) code that triggers a multitude of changes to regulate their molecular functions. Such PTM-induced changes explain how a single SRC coregulates diverse transcriptional outputs that enable the execution of wide-ranging physiological and pathophysiological responses, including even nongenomic activities in the cytoplasm and cell membrane. These non-nuclear roles for coactivators have been significantly expanded through our discovery of a new SRC-3 isoform (SRC-3?4) which functions as an essential molecular adaptor for growth factor induced signaling at the plasma membrane. Because our recent data suggesting that crosstalk between SRC- 3FL (from the nucleus) and SRC-3 ?4 (at the plasma membrane) is critical for coordinate control of cell proliferation and motility, expansion of this concept will be a major focus of this renewal application. Finally, our preliminary data show that Gene Regulated by Estrogen in Breast -1 (GREB1 (previously known as an estrogen target)) plays a critical role in the determination of the ER- positive luminal epithelial cell type and in the response of the differentiated target cell to estrogen. Therefore, a major element of this proposal will be to determine how ER, SRC-3FL and GREB1 interact to maintain identity of the luminal epithelial cell during its normal proliferative response to estrogen and promote loss of differentiation during mammary tumorigenesis.
SRC-3 full length (SRC-3FL) and SRC-3 ?4 are controlled by complex posttranslational modifications that regulate their genomic and non-genomic functions in the mammary epithelium. Here, we describe new findings that demonstrate an important signaling relationship between the SRC-3 isoforms, the estrogen receptor (ER) and GREB1 (an estrogen receptor target gene) which are important for maintaining mammary epithelial cell identity and its responsiveness to hormone. This proposal is designed to elucidate how these proteins function together to control events in the cell nucleus and membrane to regulate the normal and pathological biology of distinct cell types in the mammary epithelium.
|Zhu, Bokai; Zhang, Qiang; Pan, Yinghong et al. (2017) A Cell-Autonomous Mammalian 12 hr Clock Coordinates Metabolic and Stress Rhythms. Cell Metab 25:1305-1319.e9|
|Rohira, Aarti D; Yan, Fei; Wang, Lei et al. (2017) Targeting SRC Coactivators Blocks the Tumor-Initiating Capacity of Cancer Stem-like Cells. Cancer Res 77:4293-4304|
|Han, Sang Jun; Begum, Khurshida; Foulds, Charles E et al. (2016) The Dual Estrogen Receptor ? Inhibitory Effects of the Tissue-Selective Estrogen Complex for Endometrial and Breast Safety. Mol Pharmacol 89:14-26|
|Lonard, David M; Xu, Jianming; O'Malley, Bert W (2015) Bufalin is a steroid receptor coactivator inhibitor-response. Cancer Res 75:1157|
|Han, Sang Jun; Jung, Sung Yun; Wu, San-Pin et al. (2015) Estrogen Receptor ? Modulates Apoptosis Complexes and the Inflammasome to Drive the Pathogenesis of Endometriosis. Cell 163:960-74|
|Wang, Lei; Yu, Yang; Chow, Dar-Chone et al. (2015) Characterization of a Steroid Receptor Coactivator Small Molecule Stimulator that Overstimulates Cancer Cells and Leads to Cell Stress and Death. Cancer Cell 28:240-52|
|Yi, Ping; Wang, Zhao; Feng, Qin et al. (2015) Structure of a biologically active estrogen receptor-coactivator complex on DNA. Mol Cell 57:1047-58|
|Kang, Yun Kyoung; Putluri, Nagireddy; Maity, Suman et al. (2015) CAPER is vital for energy and redox homeostasis by integrating glucose-induced mitochondrial functions via ERR-?-Gabpa and stress-induced adaptive responses via NF-?B-cMYC. PLoS Genet 11:e1005116|
|Dasgupta, Subhamoy; Putluri, Nagireddy; Long, Weiwen et al. (2015) Coactivator SRC-2-dependent metabolic reprogramming mediates prostate cancer survival and metastasis. J Clin Invest 125:1174-88|
|Zhu, Bokai; Gates, Leah A; Stashi, Erin et al. (2015) Coactivator-Dependent Oscillation of Chromatin Accessibility Dictates Circadian Gene Amplitude via REV-ERB Loading. Mol Cell 60:769-783|
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