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Estrogen receptor alpha

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https://www.readbyqxmd.com/read/28208754/gypenoside-xvii-prevents-atherosclerosis-by-attenuating-endothelial-apoptosis-and-oxidative-stress-insight-into-the-er%C3%AE-mediated-pi3k-akt-pathway
#1
Ke Yang, Haijing Zhang, Yun Luo, Jingyi Zhang, Min Wang, Ping Liao, Li Cao, Peng Guo, Guibo Sun, Xiaobo Sun
Phytoestrogens are estrogen-like compounds of plant origin. The pharmacological activities of phytoestrogens are predominantly due to their antioxidant, anti-inflammatory and lipid-lowering properties, which are mediated via the estrogen receptors (ERs): estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ) and possibly G protein-coupled estrogen receptor 1 (GPER). Gypenoside XVII (GP-17) is a phytoestrogen that is widely used to prevent cardiovascular disease, including atherosclerosis, but the mechanism underlying these therapeutic effects is largely unclear...
February 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28202520/evolution-of-cancer-stem-like-cells-in-endocrine-resistant-metastatic-breast-cancers-is-mediated-by-stromal-microvesicles
#2
Pasquale Sansone, Marjan Berishaj, Vinagolu K Rajasekhar, Claudio Ceccarelli, Qing Chang, Antonio Strillacci, Claudia Savini, Lauren Shapiro, Robert Bowman, Chiara Mastroleo, Sabrina De Carolis, Laura Daly, Alberto Benito-Martin, Fabiana Perna, Nicola Fabbri, John H Healey, Enzo Spisni, Monica Cricca, David Lyden, Massimiliano Bonafé, Jacqueline Bromberg
The hypothesis that microvesicle (MV)-mediated microRNA transfer converts non-cancer stem cells into cancer stem cells (CSCs) leading to therapy resistance remains poorly investigated. Here we provide direct evidence supporting this hypothesis, by demonstrating how MV derived from cancer associated fibroblasts (CAF) transfer miR-221 to promote hormonal therapy resistance (HTR) in models of luminal breast cancer. We determined that CAF-derived MV horizontally transferred miR221 to tumor cells and, in combination with hormone therapy activated an ERlo/Notchhi feed-forward loop responsible for the generation of CD133hi CSC...
February 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/28199328/association-of-pvuii-and-xbai-polymorphisms-on-estrogen-receptor-alpha-esr1-gene-to-changes-into-serum-lipid-profile-of-post-menopausal-women-effects-of-aging-body-mass-index-and-breast-cancer-incidence
#3
Neuza Felix Gomes-Rochette, Letícia Soncini Souza, Bruno Otoni Tommasi, Diego França Pedrosa, Sérgio Ragi Eis, Irani do Carmo Francischetto Fin, Fernando Luiz Herkenhoff Vieira, Jones Bernardes Graceli, Letícia Batista Azevedo Rangel, Ian Victor Silva
Estrogen is a steroidal hormone involved in several physiological functions in the female body including regulation of serum lipid metabolism and breast cancer (BC). Estrogen actions on serum lipids mostly occur through its binding to intracellular Estrogen Receptor alpha (ERalpha) isoform, expressed in most of tissues. This gene (ESR1) exhibit many polymorphic sites (SNPs) located either on translated and non-translated regions that regulate ERalpha protein expression and function. This paper aimed to investigate the association of two intronic SNPs of ESR1 gene, namely c454-397T>C (PvuII) and c454-351A>G (XbaI) to alterations in serum levels of total cholesterol (T-chol), total lipid (TL), low density lipoprotein cholesterol (LDL), high density lipoprotein (HDL), and triglycerides (TG) in a cohort of post-menopausal women...
2017: PloS One
https://www.readbyqxmd.com/read/28198519/correlation-of-hypoxia-inducible-transcription-factor-in-breast-cancer-and-suvmax-of-f-18-fdg-pet-ct
#4
Young-Ju Jeong, Jae-Won Jung, Yoon-Young Cho, Sung-Hwan Park, Hoon-Kyu Oh, Sungmin Kang
BACKGROUND: Tumor hypoxia induces the expression of several genes via the hypoxia-inducible transcription factor-1 alpha (HIF-1a). It is associated with the prognosis of several cancers. We studied the immunohistochemical expression of HIF-1a in patients with invasive ductal cancer (IDC) of the breast and the possible correlation with the maximum standardized uptake value of the primary tumor (pSUVmax) as well as other biological parameters. Prognostic significance of pSUVmax and expression of HIF-1a for the prediction of progression-free survival (PFS) was also assessed...
2017: Nuclear Medicine Review. Central & Eastern Europe
https://www.readbyqxmd.com/read/28191651/the-development-of-prostate-adenocarcinoma-in-a-transgender-male-to-female-patient-could-estrogen-therapy-have-played-a-role
#5
Asma Sharif, Neha R Malhotra, Andres M Acosta, Andre A Kajdacsy-Balla, Maarten Bosland, Grace Guzman, Gail S Prins, Michael R Abern
BACKGROUND: Prostate adenocarcinoma (PCa) is a rare diagnosis in the male to female transgender (MtFT) population with only a few case reports published in the current medical literature. Long standing beliefs of androgen suppression conferring a protective effect against prostate cancer development have been challenged by the literature citing adenocarcinoma development in the prostate of rodent models following combined estrogen and testosterone treatment. MATERIALS AND METHODS: We herein present a MtFT patient who presented with high grade PCa following 20 years of exogenous estrogen therapy...
February 13, 2017: Prostate
https://www.readbyqxmd.com/read/28191286/the-regulation-of-tumor-suppressor-protein-p53-and-estrogen-receptor-er%C3%AE-by-resveratrol-in-breast-cancer-cells
#6
Julieta Saluzzo, Kelly M Hallman, Katie Aleck, Brigitte Dwyer, Meghan Quigley, Viktoria Mladenovik, Amy E Siebert, Sumi Dinda
Resveratrol (RES) is a natural antioxidant found abundantly in grapes, peanuts, and berries, and is known to possess anti-tumorigenic properties. However, there is a noticeable lack of studies on the mechanistic effects of Resveratrol on tumor suppressors. Previous studies from our laboratory have shown the tumor suppressor protein p53 and estrogen receptor-alpha (ERα) to be possible molecular targets for RES. In this study, the anti-estrogenic effects of RES were analyzed on the expression of ERα and p53...
November 2016: Genes & Cancer
https://www.readbyqxmd.com/read/28186980/diet-induced-obesity-links-to-er-positive-breast-cancer-progression-via-lpa-pkd-1-cd36-signaling-mediated-microvascular-remodeling
#7
Liuyi Dong, Ye Yuan, Cynthia Opansky, Yiliang Chen, Irene Aguilera-Barrantes, Shiyong Wu, Rong Yuan, Qi Cao, Yee Chung Cheng, Daisy Sahoo, Roy L Silverstein, Bin Ren
Obesity increases cancer risk including breast cancer (BC). However, the direct regulatory mechanisms by which obesity promotes BC progression remain largely unknown. We show that lysophosphatidic acid/protein kinase D1 (LPA/PKD-1)-CD36 signaling is a bona fide breast cancer promoter via stimulating microvascular remodeling in chronic diet-induced obesity (DIO). We observed that the growth of an estrogen receptor (ER) positive breast cancer was markedly increased when compared to the lean control, and specifically accompanied by increased microvascular remodeling in a syngeneic BC model in female DIO mice...
February 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28183321/biomarker-analysis-of-the-neosphere-study-pertuzumab-trastuzumab-and-docetaxel-versus-trastuzumab-plus-docetaxel-pertuzumab-plus-trastuzumab-or-pertuzumab-plus-docetaxel-for-the-neoadjuvant-treatment-of-her2-positive-breast-cancer
#8
Giampaolo Bianchini, Astrid Kiermaier, Giulia Valeria Bianchi, Young-Hyuck Im, Tadeusz Pienkowski, Mei-Ching Liu, Ling-Ming Tseng, Mitch Dowsett, Lila Zabaglo, Sarah Kirk, Tania Szado, Jennifer Eng-Wong, Lukas C Amler, Pinuccia Valagussa, Luca Gianni
BACKGROUND: NeoSphere showed significantly higher pathologic complete response (pCR) with neoadjuvant pertuzumab, trastuzumab, and docetaxel compared with trastuzumab plus docetaxel, pertuzumab plus trastuzumab, or pertuzumab plus docetaxel. We assessed associations between human epidermal growth factor receptor 2 (HER2) pathway-related biomarkers and clinical outcome in response to these regimens. METHODS: Tumor, serum, and whole blood samples were collected at baseline and post neoadjuvant treatment before surgery...
February 9, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/28182136/reduction-in-breast-cancer-susceptibility-due-to-xbai-gene-polymorphism-of-alpha-estrogen-receptor-gene-in-jordanians
#9
Manar Fayiz Atoum, Foad Alzoughool
Breast cancer is a global health concern among women worldwide. Estrogen receptor alpha (ERα) mediates diverse polymorphic effects in breast tissues that may relate to breast cancer susceptibility. The aim of this study was to evaluate the effect of -397 PvuII (T/C) and -351 XbaI (A/G) restriction fragment length polymorphism within intron 1 of ERα, and its effect on breast cancer susceptibility. A total of 156 women who were histopathologically diagnosed with breast cancer and 142 healthy Jordanian women were enrolled in this case-control study...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28178600/whole-flaxseed-diet-alters-estrogen-metabolism-to-promote-2-methoxtestradiol-induced-apoptosis-in-hen-ovarian-cancer
#10
Anushka Dikshit, Karen Hales, Dale Buchanan Hales
The study reported here demonstrates that a flaxseed-supplemented diet causes ovarian tumors in the laying hen to undergo apoptosis, resulting in a reduction of tumor burden, reducing the frequency and severity of ovarian cancer. We have previously shown in normal ovaries that flaxseed and its components down-regulate ERalpha and alter the expression of enzymes that metabolize estrogen. In this study, we analyzed the effects of the two main components of whole flaxseed, ligan and omega 3 fatty acids on estrogen metabolism and the estrogen receptor in ovarian tumors...
January 23, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28174300/calmodulin-lobes-facilitate-dimerization-and-activation-of-estrogen-receptor-%C3%AE
#11
Zhigang Li, Yonghong Zhang, Andrew C Hedman, James B Ames, David B Sacks
Estrogen receptor alpha (ER-α) is a nuclear hormone receptor that controls selected genes, thereby regulating proliferation and differentiation of target tissues, such as breast. Gene expression controlled by ER-α is modulated by Ca2+ via calmodulin (CaM). Here we present the NMR structure of Ca2+-CaM bound to two molecules of ER-α (residues 287-305). The two lobes of CaM bind to the same site on two separate ER-α molecules (residues 292, 296, 299, 302 and 303), which explains why CaM binds two molecules of ER-α in a 1:2 complex and stabilizes ER-α dimerization...
February 7, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28174265/sgk3-sustains-er%C3%AE-signaling-and-drives-acquired-aromatase-inhibitor-resistance-through-maintaining-endoplasmic-reticulum-homeostasis
#12
Yuanzhong Wang, Dujin Zhou, Sheryl Phung, Charles Warden, Rumana Rashid, Nymph Chan, Shiuan Chen
Many estrogen receptor alpha (ERα)-positive breast cancers initially respond to aromatase inhibitors (AIs), but eventually acquire resistance. Here, we report that serum- and glucocorticoid-inducible kinase 3 (SGK3), a kinase transcriptionally regulated by ERα in breast cancer, sustains ERα signaling and drives acquired AI resistance. SGK3 is up-regulated and essential for endoplasmic reticulum (EnR) homeostasis through preserving sarcoplasmic/EnR calcium ATPase 2b (SERCA2b) function in AI-resistant cells...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28169866/low-grade-neuroendocrine-carcinoma-of-the-skin-primary-cutaneous-carcinoid-tumor-as-a-distinctive-entity-of-cutaneous-neuroendocrine-tumors-a-clinicopathologic-study-of-3-cases-with-literature-review
#13
Keisuke Goto, Takashi Anan, Takashi Nakatsuka, Yo Kaku, Takaki Sakurai, Takaya Fukumoto, Tetsunori Kimura, Arihiro Shibata
There is scarcity of information on primary cutaneous low-grade neoplasms commonly known as carcinoid tumors, owing to their rarity. The authors present 3 cases that were named "low-grade neuroendocrine carcinoma of the skin" (LGNECS). These occurred in the dermis and subcutis of the anterior chest or the inguinal region in the elderly. Histologically, the tumors showed infiltrating proliferation of nests of various sizes, with low-grade neuroendocrine cytologic features but without mucin production. All cases exhibited varying degrees of intraductal tumor components...
February 2, 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/28163206/role-of-topical-dehydroepiandrosterone-in-ameliorating-isotretinoin-induced-meibomian-gland-dysfunction-in-adult-male-albino-rat
#14
Marwa A A Ibrahim, Walaa M Elwan
Isotretinoin broad effectiveness is limited by its detrimental effect on the Meibomian glands. Androgens have been reported to regulate the Meibomian gland function. Dehydroepiandrosterone (DHEA) is an androgen precursor considered as an efficient and physiological anti-ageing skin agent. This study aimed to investigate the role of the topical DHEA in ameliorating Meibomian gland dysfunction caused by isotretinoin employing different histological and immunohistochemical techniques. Twenty-four adult male albino rats were divided into four equal groups; control group, DHEA-treated group (1% twice daily for 3 months), isotretinoin-treated group (0...
February 2, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/28161388/estrogen-dependent-estrous-behavior-in-rabbits-is-antagonized-by-the-antiprogestin-ru486
#15
Gabriela González-Mariscal, José Antonio Gallegos, Rafael I Rueda Morales, Kurt Hoffman
Estrogen receptor-alpha (ERα) dimerizes with unliganded progesterone receptor (PR) in target tissues to trigger genomic and non-genomic effects. In ovariectomized rats the antiprogestin RU486 or antisense nucleotides against PR antagonize estradiol-induced sexual receptivity. We determined the relevance of unliganded PR for the expression of estrogen-dependent scent-marking (chinning) and sexual receptivity by injecting RU486 to: a) ovariectomized (ovx) rabbits given estradiol benzoate (EB; 5μg/day); b) intact rabbits...
February 1, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28161223/genetic-polymorphisms-in-the-esr1-and-vdr-genes-do-not-correlate-with-osteoporosis-in-patients-with-familial-dysautonomia
#16
David Cheishvili, Channa Maayan, Daniel M Sapozhnikov, Elad Lax, Rivka Dresner-Pollak
One of the major clinical manifestations of familial dysautonomia (FD)-a rare, neurodegenerative, autosomal-recessive disorder-is a high incidence and early onset of osteoporotic bone fractures. Early diagnosis is essential to initiate preventative therapy in at-risk patients and thus improve quality of life. However, the current lack of understanding of the complex relationship between FD and osteoporosis etiology precludes early diagnosis, and as such, accurate predictors of osteoporosis development in FD patients remain to be determined...
February 1, 2017: Journal of Clinical Densitometry
https://www.readbyqxmd.com/read/28119057/immunohistochemical-profiling-of-estrogen-related-receptor-gamma-in-rat-brain-and-colocalization-with-estrogen-receptor-alpha-in-the-preoptic-area
#17
Takashi Tanida, Ken Ichi Matsuda, Shunji Yamada, Mitsuhiro Kawata, Masaki Tanaka
Estrogen-related receptor (ERR) is a member of the nuclear receptor superfamily that has strong homology with estrogen receptor (ER) α. Despite the lack of endogenous ligands, ERR serves as transcription factors through their constitutively active structure with or without interaction with ERα. Among the three subtypes of ERR (α, β, and γ), ERRγ is highly expressed in brain, but the distribution of ERRγ is poorly characterized. Therefore, we investigated ERRγ immunoreactivity throughout the rostro-caudal axis in rat brain...
January 21, 2017: Brain Research
https://www.readbyqxmd.com/read/28119050/targeted-basic-research-to-highlight-the-role-of-estrogen-and-estrogen-receptors-in-the-cardiovascular-system
#18
REVIEW
Elke Dworatzek, Shokoufeh Mahmoodzadeh
Epidemiological, clinical and animal studies revealed that sex differences exist in the manifestation and outcome of cardiovascular disease (CVD). The underlying molecular mechanisms implicated in these sex differences are not fully understood. The reasons for sex differences in CVD are definitely multifactorial, but major evidence points to the contribution of sex steroid hormone, 17β-estradiol (E2), and its receptors, estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ). In this review, we summarize past and present studies that implicate E2 and ER as important determinants of sexual dimorphism in the physiology and pathophysiology of the heart...
January 21, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28116735/effect-of-estradiol-on-the-expression-of-angiogenic-factors-in-epithelial-ovarian-cancer
#19
Macarena Valladares, Francisca Plaza-Parrochia, Macarena Lépez, Daniela López, Fernando Gabler, Patricio Gayan, Alberto Selman, Margarita Vega, Carmen Romero
INTRODUCTION: Ovarian cancer presents a high angiogenesis (formation of new blood vessels) regulated by pro-angiogenic factors, mainly vascular endothelial growth factor (VEGF) and nerve growth factor (NGF). An association between endogenous levels of estrogen and increased risk of developing ovarian cancer has been reported. Estrogen action is mediated by the binding to its specific receptors (ERα and ERβ), altered ERα/ERβ ratio may constitute a marker of ovarian carcinogenesis progression...
January 24, 2017: Histology and Histopathology
https://www.readbyqxmd.com/read/28115480/sexual-dimorphism-in-a-reciprocal-interaction-of-ryanodine-and-ip3-receptors-in-the-induction-of-hyperalgesic-priming
#20
Eugen V Khomula, Luiz F Ferrari, Dionéia Araldi, Jon D Levine
: Hyperalgesic priming, a model of pain chronification in the rat is mediated by ryanodine receptor-dependent calcium release. While ryanodine induces priming in both sexes, females are 5-orders of magnitude more sensitive, by an estrogen receptor alpha (EsRα)-dependent mechanism. An inositol 1,4,5-triphosphate (IP3) receptor inhibitor prevented the induction of priming by ryanodine. For IP3 induced priming, females were also more sensitive. IP3-induced priming was prevented by pre-treatment with inhibitors of the sarco-endoplasmic reticulum calcium ATPase and ryanodine receptor...
January 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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