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Estrogen Reduction

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https://www.readbyqxmd.com/read/28436171/sex-and-regional-differences-in-rabbit-right-ventricular-l-type-calcium-current-levels-and-mathematical-modeling-of-arrhythmia-vulnerability
#1
Zane M Kalik, Joshua L Mike, Cassandra Slipski, Moriah Wright, Jozsi Z Jalics, Mark D Womble
Previous studies have shown that adult rabbit left ventricular myocytes exhibit sex and regional differences in L-type calcium current (ICa-L ) levels that contribute to increased susceptibility to arrhythmogenic early afterdepolarizations (EADs). We used patch clamp recordings from isolated adult male and female rabbit right ventricular myocytes to determine apex-base differences in ICa-L density, and mathematical modeling to examine ICa-L contribution to EAD formation. Current density measured at 0 mV in female base myocytes was 67% higher than male base myocytes and 55% higher than female apex myocytes...
April 24, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28432550/estradiol-mitigates-ischemia-reperfusion-induced-acute-renal-failure-through-nmda-receptor-antagonism-in-rats
#2
Amrit Pal Singh, Nirmal Singh, Preet Mohinder Singh Bedi
In the present study, we investigated possible involvement of N-methyl-D-aspartate receptors (NMDAR) in estradiol mediated protection against ischemia reperfusion (I/R)-induced acute renal failure (ARF) in rats. Bilateral renal ischemia of 40 min followed by reperfusion for 24 h induced ARF in male wistar rats. Quantification of serum creatinine, creatinine clearance (CrCl), blood urea nitrogen (BUN), uric acid, potassium, fractional excretion of sodium (FeNa), and urinary microproteins was done to assess I/R-induced renal damage in rats...
April 21, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28430630/estrogen-and-androgen-converting-enzymes-17%C3%AE-hydroxysteroid-dehydrogenase-and-their-involvement-in-cancer-with-a-special-focus-on-17%C3%AE-hydroxysteroid-dehydrogenase-type-1-2-and-breast-cancer
#3
REVIEW
Erik Hilborn, Olle Stål, Agneta Jansson
Sex steroid hormones such as estrogens and androgens are involved in the development and differentiation of the breast tissue. The activity and concentration of sex steroids is determined by the availability from the circulation, and on local conversion. This conversion is primarily mediated by aromatase, steroid sulfatase, and 17β-hydroxysteroid dehydrogenases. In postmenopausal women, this is the primary source of estrogens in the breast. Up to 70-80% of all breast cancers express the estrogen receptor-α, responsible for promoting the growth of the tissue...
February 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28428343/mechanisms-of-autophagy-induction-by-sex-steroids-in-bovine-mammary-epithelial-cells
#4
Katarzyna Zielniok, Agnieszka Sobolewska, Malgorzata Gajewska
In dairy cattle mammary gland involution serves to remodel the secretory tissue, and occurs in a period of overlap between mammogenic stimulation caused by next developing pregnancy and tissue regression induced by milk stasis. At this time high concentrations of 17β-estradiol (E2) and progesterone (P4) support regeneration of the mammary tissue, as well as enhance autophagy, a cellular process induced in response to stressful conditions for energy generation and homeostasis maintenance. This study aimed to elucidate the mechanisms of autophagy induction by E2 and P4 using an in vitro model of involution based on 20-fold reduction of FBS content (from 10% to 0...
April 20, 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/28419209/estrogen-deficiency-exacerbates-type-1-diabetes-induced-bone-tnf%C3%AE-expression-and-osteoporosis-in-female-mice
#5
Sandi Raehtz, Hayley Bierhalter, Daniel Schoenherr, Narayanan Parameswaran, Laura R McCabe
Estrogen deficiency following menopause is associated with rapid bone loss, osteoporosis and increased fracture risk. Type 1 Diabetes (T1D), characterized by hypoinsulinemia and hyperglycemia, is also associated with bone loss and increased fracture risk. With better treatment options, T1D patients are living longer and therefore the number of patients having both T1D and estrogen deficiency is increasing. Little is known about the mechanistic impact of T1D in conjunction with estrogen deficiency on bone physiology and density...
April 14, 2017: Endocrinology
https://www.readbyqxmd.com/read/28414719/crucial-role-of-estrogen-for-the-mammalian-female-in-regulating-semen-coagulation-and-liquefaction-in-vivo
#6
Shuai Li, Marleny Garcia, Rachel L Gewiss, Wipawee Winuthayanon
Semen liquefaction changes semen from a gel-like to watery consistency and is required for sperm to gain mobility and swim to the fertilization site in the Fallopian tubes. Kallikrein-related peptidases 3 (KLK3) and other kallikrein-related peptidases from male prostate glands are responsible for semen liquefaction by cleaving gel-forming proteins (semenogelin and collagen). In a physiological context, the liquefaction process occurs within the female reproductive tract. How seminal proteins interact with the female reproductive environment is still largely unexplored...
April 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28413432/resveratrol-regulates-body-weight-in-healthy-and-ovariectomized-rats
#7
Rupali Sharma, Neel Kamal Sharma, M Thungapathra
OBJECTIVE: The elevated body weight in post-menopausal state attributes to the reduced estrogen levels which is alleviated by resveratrol (RES) but its role in control rats is not well understood. The main objective of the study was to explore the effects of RES on the body weight of ovariectomized (OVX) female rats with controls and to relate their biochemical parameters. METHODS: Female Wistar rats weighing 200-300 g underwent bilateral ovariectomy (OVX) and were fed soya free diet (n = 8 rats per group)...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28407549/estrogenicity-assessment-of-membrane-concentrates-from-landfill-leachate-treated-by-the-uv-fenton-process-using-a-human-breast-carcinoma-cell-line
#8
Changcheng Hou, Gang Lu, Ling Zhao, Pinghe Yin, Lingfei Zhu
Membrane concentrates (MCs) are generated when membranes are used to concentrate landfill leachate. It contains high concentrations of inorganic and organic environmental pollutants, which are highly toxic and carcinogenic. In this paper, the proliferation effect (PE) from MC before and after treatment with the UV-Fenton process was assessed using the human breast carcinoma cell line MCF-7. The highest value of 116% was found at 5% (v/v) concentration after a 10 min reaction. Phthalic acid esters (PAEs) play an important role in the MC estrogenicity...
April 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28404930/microrna-regulation-of-progesterone-receptor-in-breast-cancer
#9
Avital Gilam, Ayelet Shai, Itamar Ashkenazi, Liat Appel Sarid, Assi Drobot, Amitai Bickel, Noam Shomron
Hormone receptor status is of significant value when deciding on anti-estrogenic adjuvant therapy for breast cancer tumors. However, while estrogen receptor (ER) regulation was intensively studied, the regulation of progesterone receptor (PR) levels has not been extensively investigated. MicroRNAs (miRNAs, miRs) are post-transcriptional negative regulators of gene expression involved in diverse cellular processes. The aim of this study was to identify miRNAs that regulate PR in breast cancer.We mapped potential miRNA binding sites for miR-181a, miR-23a and miR-26b on PR mRNA and demonstrated a direct regulation of PR by these three miRNAs by in-vitro Luciferase binding assays...
February 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28393207/rna-interference-mediated-silencing-of-ppgalnac-t1-and-ppgalnac-t2-inhibits-invasion-and-increases-chemosensitivity-potentially-by-reducing-terminal-%C3%AE-2-3-sialylation-and-mmp14-expression-in-triple%C3%A2-negative-breast-cancer-cells
#10
Hao Qiu, Xu Xu, Min Liu, Zerong Wang, Yaqin Yuan, Chunliang Liu, Lan Xu, Shiliang Wu
Glycopeptide-preferring polypeptide N-acetylgalactosamine transferase (ppGalNAc‑T) is a key enzyme that initiates the formation of the first GalNAc monosaccharide to polypeptides at Thr/Ser residues by O‑linked glycosylation. In order to investigate the effects of ppGalNAc‑T1 and ppGalNAc‑T2 on the initiation of O‑glycosylation, siRNA‑ppGalNAc‑T1 (si‑T1) and siRNA‑ppGalNAc‑T2 (si‑T2) were transfected into highly‑invasive estrogen receptor‑negative MDA‑MB‑231 cells to inhibit O‑glycosylation...
April 7, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28391900/estrogen-associated-severe-hypertriglyceridemia-with-pancreatitis
#11
Sumayah Aljenedil, Robert A Hegele, Jacques Genest, Zuhier Awan
BACKGROUND: Estrogen, whether therapeutic or physiologic, can cause hypertriglyceridemia. Hypertriglyceridemia-induced pancreatitis is a rare complication. CASES: We report 2 women who developed estrogen-associated severe hypertriglyceridemia with pancreatitis. The first patient developed pancreatitis secondary to hypertriglyceridemia associated with in vitro fertilization cycles. Marked reduction in her triglyceride was achieved with dietary restrictions and fibrate...
January 2017: Journal of Clinical Lipidology
https://www.readbyqxmd.com/read/28388298/nf-%C3%AE%C2%BAb-is-a-potential-molecular-drug-target-in-triple-negative-breast-cancers
#12
Paola Poma, Manuela Labbozzetta, Natale D'Alessandro, Monica Notarbartolo
Breast cancer continues to cause significant burden in global health morbidity and mortality. Triple-negative breast cancers (TNBCs) are highly aggressive with poor prognosis and are characterized by lack of expression of estrogen receptor, progesterone receptor, and human epidermal growth factor receptor (Her-2). TNBCs are often resistant to cytotoxic chemotherapy and pose major difficulty in achieving personalized medicine due to their molecular heterogeneity. There is increasing evidence that the aberrant activation of nuclear factor (NF)-κB signaling is a frequent characteristic of TNBCs...
April 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28385296/17%C3%AE-estradiol-prevents-mesenteric-injury-induced-by-occlusion-of-the-proximal-descending-aorta-in-male-rats
#13
Paulo Thales Rocha de Sousa, Ana Cristina Breithaupt-Faloppa, Cristiano de Jesus Correia, Raif Restivo Simão, Sueli Gomes Ferreira, Alfredo Inácio Fiorelli, Luiz Felipe Pinho Moreira, Paulina Sannomiya
OBJECTIVE: In surgical aortic repair or cardiac surgery with aorta occlusion, the occurrence of mesenteric ischemia and bowel injury has been associated with higher short-term mortality. The vascular protection of estrogens has been investigated and is mainly mediated by increasing the availability of nitric oxide (NO). Therefore, this study investigated the role of 17β-estradiol on visceral ischemia-reperfusion (I/R) injury after descending aorta occlusion in male rats. METHODS: Mesenteric ischemia was induced in male Wistar rats by placing a 2F Fogarty arterial embolectomy catheter (Edwards Lifesciences, Irvine, Calif) in the descending aorta, which remained occluded for 15 minutes, followed by reperfusion for up to 2 hours...
April 3, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28381809/coumestrol-down-regulates-melanin-production-in-melan-a-murine-melanocytes-through-degradation-of-tyrosinase
#14
Jeong Ah Hwang, Nok Hyun Park, Yong Joo Na, Hae Kwang Lee, John Hwan Lee, Yong Jin Kim, Chang Seok Lee
Pigmentation reflects skin darkening caused by melanin production, but excessive melanin synthesis may cause problems, such as melasma, solar lentigo, dark spots, and freckles. Considerable effort has been devoted to alleviating these undesired symptoms through the development of safe and effective depigmenting agents. Coumestrol, a plant-derived natural isoflavone with an estrogen-like structure and actions, is known to have anti-aging ability, but its potential depigmenting efficacy has not been evaluated...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28380575/reversible-reduction-of-estrone-to-17%C3%AE-estradiol-by-and-isolates-from-the-las-vegas-wash
#15
Susanna M Blunt, Mark J Benotti, Michael R Rosen, Brian P Hedlund, Duane P Moser
Environmental endocrine-disrupting compounds (EDCs) are a growing concern as studies reveal their persistence and detrimental effects on wildlife. Microorganisms are known to affect the transformation of steroid EDCs; however, the diversity of estrogen-degrading microorganisms and the range of transformations they mediate remain relatively little studied. In mesocosms, low concentrations of added estrone (E1) and 17β-estradiol (E2) were removed by indigenous microorganisms from Las Vegas Wash water within 2 wk...
March 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28379297/human-mitochondrial-pyrroline-5-carboxylate-reductase-1-promotes-invasiveness-and-impacts-survival-in-breast-cancers
#16
Jiefeng Ding, Mei-Ling Kuo, Leila Su, Lijun Xue, Frank Luh, Hang Zhang, Jianghai Wang, Tiffany G Lin, Keqiang Zhang, Peiguo Chu, Shu Zheng, Xiyong Liu, Yun Yen
Human mitochondrial pyrroline-5-carboxylate reductase (PYCR) is a house-keeping enzyme that catalyzes the reduction of Δ1-pyrroline-5-carboxylate to proline. This enzymatic cycle plays pivotal roles in amino acid metabolism, intracellular redox potential and mitochondrial integrity. Here, we hypothesize that PYCR1 might be a novel prognostic biomarker and therapeutic target for breast cancer. In this study, breast cancer tissue samples were obtained from Zhejiang University (ZJU set). Immunohistochemistry analysis was performed to detect the protein level of PYCR1, and Kaplan-Meier and Cox proportional analyses were employed in this outcome study...
April 3, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28376210/estrogen-receptor-%C3%AE-as-a-therapeutic-target-in-breast-cancer-stem-cells
#17
Ran Ma, Govindasamy-Muralidharan Karthik, John Lövrot, Felix Haglund, Gustaf Rosin, Anne Katchy, Xiaonan Zhang, Lisa Viberg, Jan Frisell, Cecilia Williams, Stig Linder, Irma Fredriksson, Johan Hartman
Background: Breast cancer cells with tumor-initiating capabilities (BSCs) are considered to maintain tumor growth and govern metastasis. Hence, targeting BSCs will be crucial to achieve successful treatment of breast cancer. Methods: We characterized mammospheres derived from more than 40 cancer patients and two breast cancer cell lines for the expression of estrogen receptors (ERs) and stem cell markers. Mammosphere formation and proliferation assays were performed on cells from 19 cancer patients and five healthy individuals after incubation with ER-subtype selective ligands...
March 1, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/28374324/which-women-decide-to-take-tamoxifen
#18
Steven A Narod, Victoria Sopik, Ping Sun
PURPOSE: To identify factors which predict, among estrogen receptor (ER)-positive breast cancer patients, who chooses to take adjuvant tamoxifen. METHODS: We studied 1347 women with ER-positive breast cancer who were treated at Women's College Hospital between 1987 and 2000. For each patient, we obtained information on age at diagnosis, tumour size, lymph node status, ER status, treatments received and dates of local recurrence and of death. We compared women who did and who did not take tamoxifen for a range of factors...
April 3, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/28364865/the-effect-of-hormone-replacement-therapy-and-tibolone-on-lipoprotein-a-concentrations-in-postmenopausal-women-a-systematic-review-and-meta-analysis
#19
REVIEW
Panagiotis Anagnostis, Petros Galanis, Vasileia Chatzistergiou, John C Stevenson, Ian F Godsland, Irene Lambrinoudaki, Mamas Theodorou, Dimitrios G Goulis
OBJECTIVE: Data on the effect of hormone replacement therapy (HRT) and tibolone on lipoprotein (a) [Lp(a)], an independent risk factor for cardiovascular disease, are heterogeneous and conflicting. Studies of the effect of HRT and tibolone on Lp(a) concentrations in post-menopausal women are reviewed in this meta-analysis. DESIGN AND METHODS: MEDLINE, Scopus, EMBASE and Cochrane databases were searched (up to February 10, 2017). Two researchers identified randomized controlled studies and extracted data...
May 2017: Maturitas
https://www.readbyqxmd.com/read/28361752/an-empirically-derived-dietary-pattern-associated-with-breast-cancer-risk-is-validated-in-a-nested-case-control-cohort-from-a-randomized-primary-prevention-trial
#20
Brandon H Hidaka, Bruce F Kimler, Carol J Fabian, Susan E Carlson
BACKGROUND & AIMS: We reported an association between cytologic atypia, a reversible biomarker of breast cancer risk, and lower omega-3/omega-6 fatty acid ratio in blood and breast tissue. Our goal was to develop and validate a dietary pattern index in this high-risk sample of U.S. women, and test its capacity to predict incidence in a nested case-control cohort of Canadian women from a randomized trial of a low-fat dietary intervention for primary prevention of breast cancer. METHODS: Food intake was measured by food frequency questionnaire in the U...
February 2017: Clinical Nutrition ESPEN
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