Estrogen receptor beta

Estrogen receptor beta (ERβ) also known as NR3A2 (nuclear receptor subfamily 3, group A, member 2) is one of two main types of estrogen receptor—a nuclear receptor which is activated by the sex hormone estrogen.[5] In humans ERβ is encoded by the ESR2 gene.[6]

ESR2
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesESR2, ER-BETA, ESR-BETA, ESRB, ESTRB, Erb, NR3A2, estrogen receptor 2, ODG8
External IDsOMIM: 601663 MGI: 109392 HomoloGene: 1100 GeneCards: ESR2
Gene location (Human)
Chr.Chromosome 14 (human)[1]
Band14q23.2-q23.3Start64,084,232 bp[1]
End64,338,112 bp[1]
RNA expression pattern




More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

2100

13983

Ensembl

ENSG00000140009

ENSMUSG00000021055

UniProt

Q92731

O08537

RefSeq (mRNA)

NM_010157
NM_207707

RefSeq (protein)

NP_034287
NP_997590

Location (UCSC)Chr 14: 64.08 – 64.34 MbChr 12: 76.12 – 76.18 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Function

ERβ is a member of the family of estrogen receptors and the superfamily of nuclear receptor transcription factors. The gene product contains an N-terminal DNA binding domain and C-terminal ligand binding domain and is localized to the nucleus, cytoplasm, and mitochondria. Upon binding to 17-β-estradiol, estriol or related ligands, the encoded protein forms homo-dimers or hetero-dimers with estrogen receptor α that interact with specific DNA sequences to activate transcription. Some isoforms dominantly inhibit the activity of other estrogen receptor family members. Several alternatively spliced transcript variants of this gene have been described, but the full-length nature of some of these variants has not been fully characterized.[7]

ERβ may inhibit cell proliferation and opposes the actions of ERα in reproductive tissue.[8] ERβ may also have an important role in adaptive function of the lung during pregnancy.[9]

ERβ is a potent tumor suppressor and plays a crucial role in many cancer types such as prostate cancer.[10][11]

Mammary gland

ERβ knockout mice show normal mammary gland development at puberty and are able to lactate normally.[12][13][14] The mammary glands of adult virgin female mice are indistinguishable from those of age-matched wild-type virgin female mice.[12] This is in contrast to ERα knockout mice, in which a complete absence of mammary gland development at puberty and thereafter is observed.[12][14] Administration of the selective ERβ agonist ERB-041 to immature ovariectomized female rats produced no observable effects in the mammary glands, further indicating that the ERβ is non-mammotrophic.[15][14][16]

Although ERβ is not required for pubertal development of the mammary glands, it may be involved in terminal differentiation in pregnancy, and may also be necessary to maintain the organization and differentiation of mammary epithelium in adulthood.[17][18] In old female ERβ knockout mice, severe cystic mammary disease that is similar in appearance to postmenopausal mastopathy develops, whereas this does not occur in aged wild-type female mice.[13] However, ERβ knockout mice are not only deficient in ERβ signaling in the mammary glands, but also have deficient progesterone exposure due to impairment of corpora lutea formation.[13][17] This complicates attribution of the preceding findings to mammary ERβ signaling.[13][17]

Selective ERβ agonism with diarylpropionitrile (DPN) has been found to counteract the proliferative effects in the mammary glands of selective ERα agonism with propylpyrazoletriol (PPT) in ovariectomized postmenopausal female rats.[19][20] Similarly, overexpression of ERβ via lentiviral infection in mature virgin female rats decreases mammary proliferation.[20] ERα signaling has proliferative effects in both normal breast and breast cancer cell lines, whereas ERβ has generally antiproliferative effects in such cell lines.[17] However, ERβ has been found to have proliferative effects in some breast cell lines.[17]

Expression of ERα and ERβ in the mammary gland have been found to vary throughout the menstrual cycle and in an ovariectomized state in female rats.[20] Whereas mammary ERα in rhesus macaques is downregulated in response to increased estradiol levels, expression of ERβ in the mammary glands is not.[21] Expression of ERα and ERβ in the mammary glands also differs throughout life in female mice.[22] Mammary ERα expression is higher and mammary ERβ expression lower in younger female mice, while mammary ERα expression is lower and mammary ERβ expression higher in older female mice as well as in parous female mice.[22] Mammary proliferation and estrogen sensitivity is higher in young female mice than in old or parous female mice, particularly during pubertal mammary gland development.[22]

Tissue distribution

ERβ is expressed by many tissues including the uterus,[23] blood monocytes and tissue macrophages, colonic and pulmonary epithelial cells and in prostatic epithelium and in malignant counterparts of these tissues. Also, ERβ is found throughout the brain at different concentrations in different neuron clusters.[24][25] ERβ is also highly expressed in normal breast epithelium, although its expression declines with cancer progression.[26] ERβ is expressed in all subtypes of breast cancer.[27] Controversy regarding ERβ protein expression has hindered study of ERβ, but highly sensitive monoclonal antibodies have been produced and well-validated to address these issues.[28]

ERβ abnormalities

ERβ function is related to various cardiovascular targets including ATP-binding cassette transporter A1 (ABCA1) and apolipoprotein A1 (ApoA-1). Polymorphism may affect ERβ function and lead to altered responses in postmenopausal women receiving hormone replacement therapy.[29] Abnormalities in gene expression associated with ERβ have also been linked to autism spectrum disorder.[30]

Disease

Cardiovascular disease

Mutations in ERβ have been shown to influence cardiomyocytes, the cells that comprise the largest part of the heart, and can lead to an increased risk of cardiovascular disease (CVD). There is a disparity in prevalence of CVD between pre- and post-menopausal women, and the difference can be attributed to estrogen levels. Many types of ERβ receptors exist in order to help regulate gene expression and subsequent health in the body, but binding of 17βE2 (a naturally occurring estrogen) specifically improves cardiac metabolism. The heart utilizes a lot of energy in the form of ATP to properly pump blood and maintain physiological requirements in order to live, and 17βE2 helps by increasing these myocardial ATP levels and respiratory function.[31]

In addition, 17βE2 can alter myocardial signaling pathways and stimulate myocyte regeneration, which can aid in inhibiting myocyte cell death. The ERβ signaling pathway plays a role in both vasodilation and arterial dilation, which contributes to an individual having a healthy heart rate and a decrease in blood pressure. This regulation can increase endothelial function and arterial perfusion, both of which are important to myocyte health. Thus, alterations in this signaling pathways due to ERβ mutation could lead to myocyte cell death from physiological stress. While ERα has a more profound role in regeneration after myocyte cell death, ERβ can still help by increasing endothelial progenitor cell activation and subsequent cardiac function.[32]

Alzheimer's disease

Genetic variation in ERβ is both sex and age dependent and ERβ polymorphism can lead to accelerated brain aging, cognitive impairment, and development of AD pathology. Similar to CVD, post-menopausal women have an increased risk of developing Alzheimer's disease (AD) due to a loss of estrogen, which affects proper aging of the hippocampus, neural survival and regeneration, and amyloid metabolism. ERβ mRNA is highly expressed in hippocampal formation, an area of the brain that is associated with memory. This expression contributes to increased neuronal survival and helps protect against neurodegenerative diseases such as AD. The pathology of AD is also associated with accumulation of amyloid beta peptide (Aβ). While a proper concentration of Aβ in the brain is important for healthy functioning, too much can lead to cognitive impairment. Thus, ERβ helps control Aβ levels by maintaining the protein it is derived from, β-amyloid precursor protein. ERβ helps by up-regulating insulin-degrading enzyme (IDE), which leads to β-amyloid degradation when accumulation levels begin to rise. However, in AD, lack of ERβ causes a decrease in this degradation and an increase in plaque build-up.[33]

ERβ also plays a role in regulating APOE, a risk factor for AD that redistributes lipids across cells. APOE expression in the hippocampus is specifically regulated by 17βE2, affecting learning and memory in individuals afflicted with AD. Thus, estrogen therapy via an ERβ-targeted approach can be used as a prevention method for AD either before or at the onset of menopause. Interactions between ERα and ERβ can lead to antagonistic actions in the brain, so an ERβ-targeted approach can increase therapeutic neural responses independently of ERα. Therapeutically, ERβ can be used in both men and women in order to regulate plaque formation in the brain.[34]

Neuroprotective benefits

Synaptic strength and plasticity

ERβ levels can dictate both synaptic strength and neuroplasticity through neural structure modifications. Variations in endogenous estrogen levels cause changes in dendritic architecture in the hippocampus, which affects neural signaling and plasticity. Specifically, lower estrogen levels lead to decreased dendritic spines and improper signaling, inhibiting plasticity of the brain. However, treatment of 17βE2 can reverse this affect, giving it the ability to modify hippocampal structure. As a result of the relationship between dendritic architecture and long-term potentiation (LTP), ERβ can enhance LTP and lead to an increase in synaptic strength. Furthermore, 17βE2 promotes neurogenesis in developing hippocampal neurons and neurons in the subventricular zone and dentate gyrus of the adult human brain. Specifically, ERβ increases the proliferation of progenitor cells to create new neurons and can be increased later in life through 17βE2 treatment.[35][36]

Ligands

Non-selective

Selective

Agonists of ERβ selective over ERα include:

Non-selective

Selective

Antagonists of ERβ selective over ERα include:

Affinities
Affinities of estrogen receptor ligands for the ERα and ERβ
LigandOther namesRelative binding affinities (RBA, %)aAbsolute binding affinities (Ki, nM)aAction
ERαERβERαERβ
EstradiolE2; 17β-Estradiol1001000.115 (0.04–0.24)0.15 (0.10–2.08)Estrogen
EstroneE1; 17-Ketoestradiol16.39 (0.7–60)6.5 (1.36–52)0.445 (0.3–1.01)1.75 (0.35–9.24)Estrogen
EstriolE3; 16α-OH-17β-E212.65 (4.03–56)26 (14.0–44.6)0.45 (0.35–1.4)0.7 (0.63–0.7)Estrogen
EstetrolE4; 15α,16α-Di-OH-17β-E24.03.04.919Estrogen
Alfatradiol17α-Estradiol20.5 (7–80.1)8.195 (2–42)0.2–0.520.43–1.2Metabolite
16-Epiestriol16β-Hydroxy-17β-estradiol7.795 (4.94–63)50??Metabolite
17-Epiestriol16α-Hydroxy-17α-estradiol55.45 (29–103)79–80??Metabolite
16,17-Epiestriol16β-Hydroxy-17α-estradiol1.013??Metabolite
2-Hydroxyestradiol2-OH-E222 (7–81)11–352.51.3Metabolite
2-Methoxyestradiol2-MeO-E20.0027–2.01.0??Metabolite
4-Hydroxyestradiol4-OH-E213 (8–70)7–561.01.9Metabolite
4-Methoxyestradiol4-MeO-E22.01.0??Metabolite
2-Hydroxyestrone2-OH-E12.0–4.00.2–0.4??Metabolite
2-Methoxyestrone2-MeO-E1<0.001–<1<1??Metabolite
4-Hydroxyestrone4-OH-E11.0–2.01.0??Metabolite
4-Methoxyestrone4-MeO-E1<1<1??Metabolite
16α-Hydroxyestrone16α-OH-E1; 17-Ketoestriol2.0–6.535??Metabolite
2-Hydroxyestriol2-OH-E32.01.0??Metabolite
4-Methoxyestriol4-MeO-E31.01.0??Metabolite
Estradiol sulfateE2S; Estradiol 3-sulfate<1<1??Metabolite
Estradiol disulfateEstradiol 3,17β-disulfate0.0004???Metabolite
Estradiol 3-glucuronideE2-3G0.0079???Metabolite
Estradiol 17β-glucuronideE2-17G0.0015???Metabolite
Estradiol 3-gluc. 17β-sulfateE2-3G-17S0.0001???Metabolite
Estrone sulfateE1S; Estrone 3-sulfate<1<1>10>10Metabolite
Estradiol benzoateEB; Estradiol 3-benzoate10???Estrogen
Estradiol 17β-benzoateE2-17B11.332.6??Estrogen
Estrone methyl etherEstrone 3-methyl ether0.145???Estrogen
ent-Estradiol1-Estradiol1.31–12.349.44–80.07??Estrogen
Equilin7-Dehydroestrone13 (4.0–28.9)13.0–490.790.36Estrogen
Equilenin6,8-Didehydroestrone2.0–157.0–200.640.62Estrogen
17β-Dihydroequilin7-Dehydro-17β-estradiol7.9–1137.9–1080.090.17Estrogen
17α-Dihydroequilin7-Dehydro-17α-estradiol18.6 (18–41)14–320.240.57Estrogen
17β-Dihydroequilenin6,8-Didehydro-17β-estradiol35–6890–1000.150.20Estrogen
17α-Dihydroequilenin6,8-Didehydro-17α-estradiol20490.500.37Estrogen
Δ8-Estradiol8,9-Dehydro-17β-estradiol68720.150.25Estrogen
Δ8-Estrone8,9-Dehydroestrone19320.520.57Estrogen
EthinylestradiolEE; 17α-Ethynyl-17β-E2120.9 (68.8–480)44.4 (2.0–144)0.02–0.050.29–0.81Estrogen
MestranolEE 3-methyl ether?2.5??Estrogen
MoxestrolRU-2858; 11β-Methoxy-EE35–435–200.52.6Estrogen
Methylestradiol17α-Methyl-17β-estradiol7044??Estrogen
DiethylstilbestrolDES; Stilbestrol129.5 (89.1–468)219.63 (61.2–295)0.040.05Estrogen
HexestrolDihydrodiethylstilbestrol153.6 (31–302)60–2340.060.06Estrogen
DienestrolDehydrostilbestrol37 (20.4–223)56–4040.050.03Estrogen
Benzestrol (B2)–114???Estrogen
ChlorotrianiseneTACE1.74?15.30?Estrogen
TriphenylethyleneTPE0.074???Estrogen
TriphenylbromoethyleneTPBE2.69???Estrogen
TamoxifenICI-46,4743 (0.1–47)3.33 (0.28–6)3.4–9.692.5SERM
Afimoxifene4-Hydroxytamoxifen; 4-OHT100.1 (1.7–257)10 (0.98–339)2.3 (0.1–3.61)0.04–4.8SERM
Toremifene4-Chlorotamoxifen; 4-CT??7.14–20.315.4SERM
ClomifeneMRL-4125 (19.2–37.2)120.91.2SERM
CyclofenilF-6066; Sexovid151–152243??SERM
NafoxidineU-11,000A30.9–44160.30.8SERM
Raloxifene–41.2 (7.8–69)5.34 (0.54–16)0.188–0.5220.2SERM
ArzoxifeneLY-353,381??0.179?SERM
LasofoxifeneCP-336,15610.2–16619.00.229?SERM
OrmeloxifeneCentchroman??0.313?SERM
Levormeloxifene6720-CDRI; NNC-460,0201.551.88??SERM
OspemifeneDeaminohydroxytoremifene0.82–2.630.59–1.22??SERM
Bazedoxifene–??0.053?SERM
EtacstilGW-56384.3011.5??SERM
ICI-164,384–63.5 (3.70–97.7)1660.20.08Antiestrogen
FulvestrantICI-182,78043.5 (9.4–325)21.65 (2.05–40.5)0.421.3Antiestrogen
PropylpyrazoletriolPPT49 (10.0–89.1)0.120.4092.8ERα agonist
16α-LE216α-Lactone-17β-estradiol14.6–570.0890.27131ERα agonist
16α-Iodo-E216α-Iodo-17β-estradiol30.22.30??ERα agonist
MethylpiperidinopyrazoleMPP110.05??ERα antagonist
DiarylpropionitrileDPN0.12–0.256.6–1832.41.7ERβ agonist
8β-VE28β-Vinyl-17β-estradiol0.3522.0–8312.90.50ERβ agonist
PrinaberelERB-041; WAY-202,0410.2767–72??ERβ agonist
ERB-196WAY-202,196?180??ERβ agonist
ErteberelSERBA-1; LY-500,307??2.680.19ERβ agonist
SERBA-2–??14.51.54ERβ agonist
Coumestrol–9.225 (0.0117–94)64.125 (0.41–185)0.14–80.00.07–27.0Xenoestrogen
Genistein–0.445 (0.0012–16)33.42 (0.86–87)2.6–1260.3–12.8Xenoestrogen
Equol–0.2–0.2870.85 (0.10–2.85)??Xenoestrogen
Daidzein–0.07 (0.0018–9.3)0.7865 (0.04–17.1)2.085.3Xenoestrogen
Biochanin A–0.04 (0.022–0.15)0.6225 (0.010–1.2)1748.9Xenoestrogen
Kaempferol–0.07 (0.029–0.10)2.2 (0.002–3.00)??Xenoestrogen
Naringenin–0.0054 (<0.001–0.01)0.15 (0.11–0.33)??Xenoestrogen
8-Prenylnaringenin8-PN4.4???Xenoestrogen
Quercetin–<0.001–0.010.002–0.040??Xenoestrogen
Ipriflavone–<0.01<0.01??Xenoestrogen
Miroestrol–0.39???Xenoestrogen
Deoxymiroestrol–2.0???Xenoestrogen
β-Sitosterol–<0.001–0.0875<0.001–0.016??Xenoestrogen
Resveratrol–<0.001–0.0032???Xenoestrogen
α-Zearalenol–48 (13–52.5)???Xenoestrogen
β-Zearalenol–0.6 (0.032–13)???Xenoestrogen
Zeranolα-Zearalanol48–111???Xenoestrogen
Taleranolβ-Zearalanol16 (13–17.8)140.80.9Xenoestrogen
ZearalenoneZEN7.68 (2.04–28)9.45 (2.43–31.5)??Xenoestrogen
ZearalanoneZAN0.51???Xenoestrogen
Bisphenol ABPA0.0315 (0.008–1.0)0.135 (0.002–4.23)19535Xenoestrogen
EndosulfanEDS<0.001–<0.01<0.01??Xenoestrogen
KeponeChlordecone0.0069–0.2???Xenoestrogen
o,p'-DDT–0.0073–0.4???Xenoestrogen
p,p'-DDT–0.03???Xenoestrogen
Methoxychlorp,p'-Dimethoxy-DDT0.01 (<0.001–0.02)0.01–0.13??Xenoestrogen
HPTEHydroxychlor; p,p'-OH-DDT1.2–1.7???Xenoestrogen
TestosteroneT; 4-Androstenolone<0.0001–<0.01<0.002–0.040>5000>5000Androgen
DihydrotestosteroneDHT; 5α-Androstanolone0.01 (<0.001–0.05)0.0059–0.17221–>500073–1688Androgen
Nandrolone19-Nortestosterone; 19-NT0.010.2376553Androgen
DehydroepiandrosteroneDHEA; Prasterone0.038 (<0.001–0.04)0.019–0.07245–1053163–515Androgen
5-AndrostenediolA5; Androstenediol6173.60.9Androgen
4-Androstenediol–0.50.62319Androgen
4-AndrostenedioneA4; Androstenedione<0.01<0.01>10000>10000Androgen
3α-Androstanediol3α-Adiol0.070.326048Androgen
3β-Androstanediol3β-Adiol3762Androgen
Androstanedione5α-Androstanedione<0.01<0.01>10000>10000Androgen
Etiocholanedione5β-Androstanedione<0.01<0.01>10000>10000Androgen
Methyltestosterone17α-Methyltestosterone<0.0001???Androgen
Ethinyl-3α-androstanediol17α-Ethynyl-3α-adiol4.0<0.07??Estrogen
Ethinyl-3β-androstanediol17α-Ethynyl-3β-adiol505.6??Estrogen
ProgesteroneP4; 4-Pregnenedione<0.001–0.6<0.001–0.010??Progestogen
NorethisteroneNET; 17α-Ethynyl-19-NT0.085 (0.0015–<0.1)0.1 (0.01–0.3)1521084Progestogen
Norethynodrel5(10)-Norethisterone0.5 (0.3–0.7)<0.1–0.221453Progestogen
Tibolone7α-Methylnorethynodrel0.5 (0.45–2.0)0.2–0.076??Progestogen
Δ4-Tibolone7α-Methylnorethisterone0.069–<0.10.027–<0.1??Progestogen
3α-Hydroxytibolone–2.5 (1.06–5.0)0.6–0.8??Progestogen
3β-Hydroxytibolone–1.6 (0.75–1.9)0.070–0.1??Progestogen
Footnotes: a = (1) Binding affinity values are of the format "median (range)" (# (#–#)), "range" (#–#), or "value" (#) depending on the values available. The full sets of values within the ranges can be found in the Wiki code. (2) Binding affinities were determined via displacement studies in a variety of in-vitro systems with labeled estradiol and human ERα and ERβ proteins (except the ERβ values from Kuiper et al. (1997), which are rat ERβ). Sources: See template page.

Interactions

Estrogen receptor beta has been shown to interact with:

References
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