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Estrogen receptor alpha

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https://www.readbyqxmd.com/read/29345963/deletion-of-estrogen-receptor-alpha-in-skeletal-muscle-results-in-impaired-contractility-in-female-mice
#1
Brittany C Collins, Tara L Mader, Christine A Cabelka, Melissa R Iñigo, Espen E Spangenburg, Dawn A Lowe
Estradiol deficiency in females can result in skeletal muscle strength loss, and treatment with estradiol mitigates the loss. There are three primary estrogen receptors and estradiol elicits effects through these receptors in various tissues. Ubiquitous estrogen receptor α (ERα) knockout mice exhibit numerous biological disorders, but little is known regarding the specific role of ERα in skeletal muscle contractile function. The purpose of this study was to determine the impact of skeletal muscle specific ERα deletion on contractile function, hypothesizing that ERα is a main receptor through which estradiol affects muscle strength in females...
January 18, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29342868/hypoxia-and-hormone-mediated-pathways-converge-at-the-histone-demethylase-kdm4b-in-cancer
#2
REVIEW
Jun Yang, Adrian L Harris, Andrew M Davidoff
Hormones play an important role in pathophysiology. The hormone receptors, such as estrogen receptor alpha and androgen receptor in breast cancer and prostate cancer, are critical to cancer cell proliferation and tumor growth. In this review we focused on the cross-talk between hormone and hypoxia pathways, particularly in breast cancer. We delineated a novel signaling pathway from estrogen receptor to hypoxia-inducible factor 1, and discussed the role of this pathway in endocrine therapy resistance. Further, we discussed the estrogen and hypoxia pathways converging at histone demethylase KDM4B, an important epigenetic modifier in cancer...
January 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29334205/overexpression-of-endometrial-estrogen-receptor-alpha-in-the-window-of-implantation-in-women-with-unexplained-infertility
#3
Mehran Dorostghoal, Hamid-O-Allah Ghaffari, Farideh Marmazi, Narjes Keikhah
Background: Failure in the endometrial receptivity may account for a significant number of infertility cases including unexplained infertility in women. Reduction in the endometrial estrogen receptor-alpha (ER-α) expression during implantation may be a critical event that coincides with the expression of specific genes and the formation of a receptive endometrium. The aim of the present study was to assess the expression of ER-α in the mid-secretory phase in the endometrium of women with unexplained infertility...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29331506/hepatocyte-estrogen-receptor-alpha-mediates-estrogen-action-to-promote-reverse-cholesterol-transport-during-western-type-diet-feeding
#4
Lin Zhu, Jeanne Shi, Thao N Luu, Joshua C Neuman, Elijah Trefts, Sophia Yu, Brian T Palmisano, David H Wasserman, MacRae F Linton, John M Stafford
OBJECTIVE: Hepatocyte deletion of estrogen receptor alpha (LKO-ERα) worsens fatty liver, dyslipidemia, and insulin resistance in high-fat diet fed female mice. However, whether or not hepatocyte ERα regulates reverse cholesterol transport (RCT) in mice has not yet been reported. METHODS AND RESULTS: Using LKO-ERα mice and wild-type (WT) littermates fed a Western-type diet, we found that deletion of hepatocyte ERα impaired in vivo RCT measured by the removal of 3H-cholesterol from macrophages to the liver, and subsequently to feces, in female mice but not in male mice...
December 29, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29323058/assessment-of-topoisomerase-ii-alpha-gene-status-by-dual-color-chromogenic-in-situ-hybridization-in-a-set-of-iraqi-patients-with-invasive-breast-carcinoma
#5
Rasha Abd Alraouf Neama, Manal A Habib, Sahira A Ali, Ali H Al-Khafaji, Mohammed F Alqanbar
BACKGROUND: The human epidermal growth factor receptor 2(HER2) proto-oncogene is overexpressed or amplified in approximately 15%-25% of invasive breast cancers. Approximately 35% of HER2-amplified breast cancers have coamplification of the topoisomerase II-alpha (TOP2A) gene encoding an enzyme that is a major target of anthracyclines. Hence, the determination of genetic alteration (amplification or deletion) of both genes is considered as an important predictive factor that determines the response of breast cancer patients to treatment...
October 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/29315431/receptor-conversion-in-distant-breast-cancer-metastases-a-systematic-review-and-meta-analysis
#6
Willemijne A M E Schrijver, Karijn P M Suijkerbuijk, Carla H van Gils, Elsken van der Wall, Cathy B Moelans, Paul J van Diest
Background: In metastatic breast cancer, hormone and/or human epidermal growth factor receptor 2 (HER2)-targeted therapy decision-making is still largely based on tissue characteristics of the primary tumor. However, a change of estrogen receptor alpha (ERα), progesterone receptor (PR), and HER2 status in distant metastases has frequently been reported. The actual incidence of this phenomenon has been debated. Methods: We performed a meta-analysis including 39 studies assessing receptor conversion from primary breast tumors to paired distant breast cancer metastases...
January 5, 2018: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/29306943/clinically-observed-estrogen-receptor-alpha-mutations-within-the-ligand-binding-domain-confer-distinguishable-phenotypes
#7
Shanhang Jia, Mark T Miedel, Marilyn Ngo, Ryan Hessenius, Ning Chen, Peilu Wang, Amir Bahreini, Zheqi Li, Zhijie Ding, Tong Ying Shun, Daniel M Zuckerman, D Lansing Taylor, Shannon L Puhalla, Adrian V Lee, Steffi Oesterreich, Andrew M Stern
OBJECTIVE: Twenty to fifty percent of estrogen receptor-positive (ER+) metastatic breast cancers express mutations within the ER ligand-binding domain. While most studies focused on the constitutive ER signaling activity commonly engendered by these mutations selected during estrogen deprivation therapy, our study was aimed at investigating distinctive phenotypes conferred by different mutations within this class. METHODS: We examined the two most prevalent mutations, D538G and Y537S, employing corroborative genome-edited and lentiviral-transduced ER+ T47D cell models...
January 6, 2018: Oncology
https://www.readbyqxmd.com/read/29302899/salivary-duct-carcinoma-and-invasive-ductal-carcinoma-of-the-breast-a-comparative-immunohistochemical-study
#8
Jalal B Jalaly, Souzan Sanati, Rebecca D Chernock, Dikson G Dibe, Samir K El-Mofty
Salivary duct carcinoma (SDC) is a high-grade salivary gland malignancy with great morphological resemblance to invasive ductal carcinoma (IDC) of the breast. Rarely, female patients may have a past history of both SDC and IDC. When these patients present with distant metastasis, accurate identification of the primary tumor is particularly difficult. Additionally, rare metastasis of SDC to the breast and IDC to the salivary (parotid) gland can also present a diagnostic challenge. Our aim was to develop an immunohistochemical panel that reliably distinguishes SDC from IDC...
January 4, 2018: Head and Neck Pathology
https://www.readbyqxmd.com/read/29299971/the-role-of-the-fas-fasl-signaling-pathway-in-environmental-toxicant-induced-testicular-cell-apoptosis-an-update
#9
Mei Wang, Ping Su
The Fas/FasL signaling pathway is one of the major pathways that regulate apoptosis. Increasing studies have shown that the activation of the Fas/FasL signaling pathway is closely associated with testicular cell apoptosis. However, the mechanism involved is still unclear. We discuss recent findings regarding the molecular mechanisms by which environmental toxicants induce testicular pathology via Fas/FasL signaling. These findings suggest that Fas/FasL signaling is employed to impact the sensitivity (a response to external factors) of germ cells, disrupt steroidogenic hormone and cytokine metabolism mediated by Sertoli cells, and elicit the activation of NFAT (nuclear factor of activated T-cells) in Leydig cell apoptosis...
January 4, 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29299139/reduced-alternative-splicing-of-estrogen-receptor-alpha-in-the-endometrium-of-women-with-endometriosis
#10
Ying Zhang, Yong Zhang, Chunbo Zhao, Tiantian Yu, Ye Liu, Weihui Shi, Fengtao Shi, Xinmei Liu, Jianzhong Sheng, Hefeng Huang, Hong Xu
Endometriosis is a condition which involves the presence of uterine stroma and glands outside of the uterine cavity and represents one of the most prevalent disorders of the female reproductive tract. The key symptom of endometriosis is pain, including dysmenorrhea, deep dyspareunia, and chronic pelvic pain. As such, endometriosis has significant economic consequences within the healthcare system and can influence the daily quality of life in affected patients. However, the pathophysiology of this disease and the mechanisms in which this condition generates pain are very unclear...
December 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/29295894/a-computational-based-approach-to-identify-estrogen-receptor-alpha-beta-heterodimer-selective-ligands
#11
Carlos Coriano, Fabao Liu, Chelsie Sievers, Muxuan Liang, Yidan Wang, Yoongho Lim, Menggang Yu, Wei Xu
The biological effects of estrogens are transduced by two estrogen receptors (ERs), ERα and ERβ, which function in dimer forms. The ERα/α homodimer promotes and the ERβ/β inhibits estrogen dependent growth of mammary epithelial cells, the functions of ERα/β heterodimers remain elusive. Using compounds that promote ERα/β heterodimerization, we have shown that ERα/β heterodimers appeared to inhibit tumor cell growth and migration in vitro. Further dissection of ERα/β heterodimer functions was hampered by the lack of ERα/β heterodimer specific ligands...
January 2, 2018: Molecular Pharmacology
https://www.readbyqxmd.com/read/29289754/estrogen-regulated-transcription-mammary-gland-and-uterus
#12
Yasmin M Vasquez
Estrogen (E2) plays a central role in the developmental, metabolic and reproductive functions of both males and females. E2 acts via the estrogen receptor alpha (ERα) to regulate transcription of genes involved in numerous cellular functions. The E2-dependent engagement of ERα across the genome, collectively called the ERα 'cistrome', exhibits a high degree of complexity and plasticity. The ERα cistrome is defined by pioneer factors, transcription co-factors, posttranslational modifications of ERα, the chromatin environment, and cross talk with other signaling pathways...
December 29, 2017: Steroids
https://www.readbyqxmd.com/read/29286617/genistein-and-trichostatin-a-induction-of-estrogen-receptor-alpha-gene-expression-apoptosis-and-cell-growth-inhibition-in-hepatocellular-carcinoma-hepg-2-cells
#13
Masumeh Sanaei, Fraidoon Kavoosi, Habibeh Salehi
Epigenetic changes such as DNA methylation and histone acetylation play important roles in determining gene expression. Hypermethylation of CpG islands of the promoter region of tumor suppressor genes can greatly influence carcinogenesis through transcriptional silencing. Acetylation of lysine in histone tails causes relaxation of chromatin, which facilitates gene transcription, while deacetylation is associated with condensed chromatin resulting in gene silencing. DNA demethylating agents such as genistein (GE) and histone deacetylase inhibitors (HDACIs) such as trichostatin A (TSA) may strongly reactivate silenced genes and exposure to these two agents in combination is reported to enhance estrogen receptor alpha (ERα) reactivation and induction of apoptosis...
December 29, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/29277501/the-role-of-angiogenesis-inflammation-and-estrogen-receptors-in-breast-implant-capsules-development-and-remodeling
#14
Francesco Segreto, Simone Carotti, Giovanni Francesco Marangi, Daniele Tosi, Maria Zingariello, Alfonso Luca Pendolino, Laura Sancillo, Sergio Morini, Paolo Persichetti
BACKGROUND: Capsular contracture is the most common complication following breast implant placement. The multiple factors unbalancing the physiological response to the foreign body have not been fully elucidated. The aim of this study was to investigate the role of neo-angiogenesis, inflammation and estrogen receptors in peri-prosthetic tissue development and remodeling. METHODS: The study enrolled 31 women who underwent expander substitution with definitive implant...
December 13, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/29277037/environmental-pollutant-hexachlorobenzene-induces-hypertension-in-a-rat-model
#15
Rocío Castilla, Agustín Asuaje, Stéphanie Rivière, Caimi Giselle Romero, Pedro Martín, Gabriel Cao, Diana Kleiman de Pisarev, Verónica Milesi, Laura Alvarez
Hexachlorobenzene (HCB) is a dioxin-like environmental pollutant, widely distributed in the environment. New research links exposure to high levels of persistent organic environmental toxicants to cardiovascular disease, however little is known about the effect of HCB on vascular function and on blood pressure. The purpose of the present study was to evaluate biochemical and cardiovascular changes resulting from subchronic HCB exposure. Adult female Sprague-Dawley rats were treated with vehicle or HCB (5 or 500 mg/kg b...
November 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/29273958/biomarkers-in-breast-cancer-a-consensus-statement-by-the-spanish-society-of-medical-oncology-and-the-spanish-society-of-pathology
#16
R Colomer, I Aranda-López, J Albanell, T García-Caballero, E Ciruelos, M Á López-García, J Cortés, F Rojo, M Martín, J Palacios-Calvo
This consensus statement revises and updates the recommendations for biomarkers use in the diagnosis and treatment of breast cancer, and is a joint initiative of the Spanish Society of Medical Oncology and the Spanish Society of Pathology. This expert group recommends determining in all cases of breast cancer the histologic grade and the alpha-estrogen receptor (ER), progesterone receptor, Ki-67 and HER2 status, in order to assist prognosis and establish therapeutic options, including hormone therapy, chemotherapy and anti-HER2 therapy...
December 22, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/29250928/longitudinal-interplays-of-estrogen-receptor-alpha-gene-rs9340799-with-social-environmental-factors-on-post-traumatic-stress-disorder-in-chinese-han-adolescents-after-wenchuan-earthquake
#17
Yue Feng, Mi Su, Yan Jun Si, Qi Wei Guo, Jia Lin, Ting Cao, Xin Zhang, Mei Fan, Ding Zhi Fang
Indirect evidences suggested associations of estrogen receptor alpha (ESR1) with post-traumatic stress disorder (PTSD). However, the relationship between rs9340799 on ESR1 gene and PTSD has not been reported yet. The present study was to explore the longitudinal changes of prevalence and severity of PTSD in adolescents with different genotypes of rs9340799 after the 2008 Wenchuan earthquake. Social-environmental factors were collected by questionnaires in 465 high school students. Variants of rs9340799 were determined by polymerase chain reaction-restriction fragment length polymorphism analyses and verified by DNA sequencing...
December 18, 2017: American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics
https://www.readbyqxmd.com/read/29250651/immunohistochemical-significance-of-er-alpha-inhibin-a-calretinin-and-ki67-expression-in-granulosa-cell-ovarian-tumors
#18
Raluca Anca Balan, Irina Draga Căruntu, Simona Eliza Giuşcă, Ludmila Lozneanu, Ioana Păvăleanu, Răzvan Vladimir Socolov, Lucian Miron, Mihai Vasile Marinca, Cornelia Amălinei
Adult granulosa cell tumors (AGCTs) have a heterogeneous morphology and an unpredictable behavior, which can lead to a misinterpreted diagnosis. The aim of our study was to assess the immunoexpression of estrogen receptor (ER) alpha, Ki67, calretinin, and inhibin A in AGCTs, in order to evaluate their value in diagnosis and prognosis of this type of tumor. Immunohistochemical stainings for these markers were performed in 21 cases of AGCTs. The immunopositivity evaluation of calretinin and inhibin A was scored according to the percentage of staining intensity and the extent of positive cells, of ER alpha was scored based on the percentage of positive cells, and Ki67 score was recorded as the percentage of positively stained nuclei across the tumor, without taking in consideration the staining intensity...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/29239334/calycosin-improves-cognitive-function-in-a-transgenic-mouse-model-of-alzheimer-s-disease-by-activating-the-protein-kinase-c-pathway
#19
Lei Song, Xiaoping Li, Xiao-Xue Bai, Jian Gao, Chun-Yan Wang
The major pathological changes in Alzheimer's disease are beta amyloid deposits and cognitive impairment. Calycosin is a typical phytoestrogen derived from radix astragali that binds to estrogen receptors to produce estrogen-like effects. Radix astragali Calycosin has been shown to relieve cognitive impairment induced by diabetes mellitus, suggesting calycosin may improve the cognitive function of Alzheimer's disease patients. The protein kinase C pathway is upstream of the mitogen-activated protein kinase pathway and exerts a neuroprotective effect by regulating Alzheimer's disease-related beta amyloid degradation...
November 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29228577/egr1-regulates-cellular-metabolism-and-survival-in-endocrine-resistant-breast-cancer
#20
Ayesha N Shajahan-Haq, Simina M Boca, Lu Jin, Krithika Bhuvaneshwar, Yuriy Gusev, Amrita K Cheema, Diane D Demas, Kristopher S Raghavan, Ryan Michalek, Subha Madhavan, Robert Clarke
About 70% of all breast cancers are estrogen receptor alpha positive (ER+; ESR1). Many are treated with antiestrogens. Unfortunately, de novo and acquired resistance to antiestrogens is common but the underlying mechanisms remain unclear. Since growth of cancer cells is dependent on adequate energy and metabolites, the metabolomic profile of endocrine resistant breast cancers likely contains features that are deterministic of cell fate. Thus, we integrated data from metabolomic and transcriptomic analyses of ER+ MCF7-derived breast cancer cells that are antiestrogen sensitive (LCC1) or resistant (LCC9) that resulted in a gene-metabolite network associated with EGR1 (early growth response 1)...
November 14, 2017: Oncotarget
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