Unknown,Transcriptomics,Genomics,Proteomics

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Development of Pathway Preferential Estrogens Affording Beneficial Metabolic and Vascular Actions without Reproductive Tissue Stimulation in Mice

ABSTRACT: There is great medical need for estrogens having favorable pharmacological profiles, supporting desirable activities for menopausal women such as metabolic and vascular protection but lacking stimulatory activities on the breast or uterus. Here, we report the development of structurally novel estrogens with favorable target tissue-selective estrogenic activity. Through a process of structural alteration of the hormone estradiol that preserves essential chemical and physical features of estradiol but greatly moderates its binding affinity for the estrogen receptors (ERs), we obtained Pathway Preferential Estrogens (PaPEs) capable of having interaction with ER that is sufficient to activate the extranuclear-initiated signaling pathway preferentially over the direct nuclear-initiated pathway. PaPE modulate a pattern of gene regulation and cellular and biological processes that result in essentially no stimulation of reproductive and mammary tissues and breast cancer cells, but have a favorable pattern of activity on metabolic tissues and the vasculature. The structural permutation process represents a novel approach to govern the balance in utilization of extranuclear vs. nuclear pathways of ER action to obtain tissue-selective/non-nuclear pathway-preferential estrogens, which should prove to be beneficial for postmenopausal hormone replacement. The approach may also have broad applicability for other members of the nuclear hormone receptor superfamily. 24 samples; inhibitor and time course experiments

ORGANISM(S): Homo sapiens

SUBMITTER: Zeynep Madak Erdogan

PROVIDER: E-GEOD-73663 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Design of pathway preferential estrogens that provide beneficial metabolic and vascular effects without stimulating reproductive tissues.

Madak-Erdogan Zeynep Z Kim Sung Hoon SH Gong Ping P Zhao Yiru C YC Zhang Hui H Chambliss Ken L KL Carlson Kathryn E KE Mayne Christopher G CG Shaul Philip W PW Korach Kenneth S KS Katzenellenbogen John A JA Katzenellenbogen Benita S BS

Science signaling 20160524 429

There is great medical need for estrogens with favorable pharmacological profiles that support desirable activities for menopausal women, such as metabolic and vascular protection, but that lack stimulatory activities on the breast and uterus. We report the development of structurally novel estrogens that preferentially activate a subset of estrogen receptor (ER) signaling pathways and result in favorable target tissue-selective activity. Through a process of structural alteration of estrogenic ...[more]

PMID: 27221711

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Project description:The closely related transcription factors (TFs), estrogen receptors ERα and ERβ, regulate divergent gene expression programs and proliferative outcomes in breast cancer. Utilizing MCF-7 breast cancer cells with ERα, ERβ, or both receptors as a model system to define the basis of differing response specification by related TFs, we show that these TFs and their key coregulators, SRC3 and RIP140, generate overlapping as well as unique chromatin-binding and transcription-regulating modules. Cistrome and transcriptome analyses and use of clustering algorithms delineated 11 clusters representing different chromatin-bound receptor and coregulator assemblies that could be functionally associated through enrichment analysis with distinct patterns of gene regulation and preferential coregulator usage, RIP140 with ERβ and SRC3 with ERα. The receptors modified each other’s transcriptional effect, and ERβ countered the proliferative drive of ERα through several novel mechanisms associated with specific binding site clusters. Our findings delineate distinct TF-coregulator assemblies that function as control nodes specifying precise patterns of gene regulation, proliferation, and metabolism, as exemplified by two of the most important nuclear hormone receptors in human breast cancer. MCF-7 cells expressing endogenous ERalpha were infected with adenovirus carrying either estrogen receptor beta (AdERb) or no insert (Ad) at multiplicity of infection (moi) of 50. ERβ only cells were generated from these cells by knockdown of ERα in parental cells using the following siERα sequences from Dharmacon: forward, 5’-UCAUCGCAUUCCUUGCAAAdTdT-3’, and reverse, 5’-UUUGCAAGGAAUGCGAUGAdTdT-3’. siRNA experiments were performed as previously described, and resulted in knocknown of ERα mRNA and protein by greater than 95% (GSE4006, PMID 16809442). Briefly, cells were transfected with 20 nM siCtrl [GSE4006] or siERα for 48 h after infection. Then cells were treated with 0.1% EtOH (Veh) or 10 nM E2 (Sigma-Aldrich) for 24h. All experiments were conducted with two replicates. key words; Adenovirus infection,siRNA knock-down, ligand treatment

Dataset Information

Development of Pathway Preferential Estrogens Affording Beneficial Metabolic and Vascular Actions without Reproductive Tissue Stimulation in Mice

Publications

Design of pathway preferential estrogens that provide beneficial metabolic and vascular effects without stimulating reproductive tissues.

Similar Datasets

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