Search results for "estrogen receptor alpha"

Alleles and haplotypes of the estrogen receptor alpha gene are associated with an increased risk of spontaneous abortion.

2010

Objective To investigate whether polymorphisms in estrogen receptor alpha (ERα) or beta (ERβ) genes are associated with a risk of miscarriage. Design A retrospectively analyzed, prospectively obtained database of cases and controls. Setting University hospital menopause unit. Patient(s) 177 women with at least one spontaneous abortion and 442 controls with at least one live birth and no history of miscarriage. Intervention(s) None. Main Outcome Measure(s) Genotype frequencies and odd ratios for abortion risk in cases and controls for four single nucleotide polymorphisms (SNPs) located in intron 1 (C>T and A>G), intron 4 (A>T), and exon 8 (T>C) for the ERα gene, and two SNPs located in intro…

Estrogen receptor alpha polymorphism modifies the association between childhood exercise and bone mass: follow-up study.

2007

This follow-up study confirms our previous findings that the ER-α PvuII polymorphism (Pp) modulates the association between exercise and bone mass. The differences in bone properties of girls with consistently low physical activity (LLPA) and consistently high physical activity (HHPA) were evident only in those bearing the heterozygote ER-α genotype (Pp). In particular, areal bone mineral density of the total femur, bone mineral content and areal bone mineral density of the femoral neck, and bone mineral content and cortical thickness of the tibia shaft were significantly (p < .05) lower in the Pp girls with LLPA than in their HHPA counterparts. These findings might partly explain the ge…

Estrogen receptors α (ERα), ERβ and their variants may be responsible for estrogen implication in human liver carcinogenesis and tumor progression

2009

The estrogen receptor α:insulin receptor substrate 1 complex in breast cancer: structure–function relationships

2007

Background: Insulin receptor substrate 1 (IRS-1) is a signaling molecule that exerts a key role in mediating cross talk between estrogen receptor a (ERa) and insulin-like growth factor 1 (IGF-1) in breast cancer cells. Previously, we demonstrated that a fraction of IRS-1 binds ERa, translocates to the nucleus, and modulates ERa-dependent transcription at estrogen response elements (ERE). Here, we studied structure-function relationships of the ER-a:IRS-1 complex under IGF-1 and/or estradiol (E 2 ) stimulation. Materials and methods: ERa and IRS-1 deletion mutants were used to analyze structural and functional ERα/IRS-1 interactions. IRS-1 binding to ERE and IRS-1 role in ERa-dependent ERE t…

Estrogenic Modulation of Longevity by Induction of Antioxidant Enzymes

2010

In many species including humans, females live longer than males. We and others have observed that mitochondria from females of Wistar rats and of OF1 mice produce half the amount of peroxide produced by males. We attributed this to a change in the expression of antioxidant, longevity-related genes. We have found that in those species in which females live longer than males, estrogens activate longevity-related genes, particularly antioxidant ones. It should be emphasized that estrogens do not act as antioxidants because of their phenolic ring but rather they act indirectly; that is, they behave as hormones and bind to estrogen receptors, which eventually leads to the upregulation of the ex…

Estradiol, acting through estrogen receptor alpha, restores dimethylarginine dimethylaminohydrolase activity and nitric oxide production in oxLDL-tre…

2011

Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide (NO) synthase. ADMA accumulation, mainly due to a decreased dimethylarginine dimethylaminohydrolase (DDAH) activity, has been related to the development of cardiovascular diseases. We investigate whether estradiol prevents the changes induced by oxidized low density lipoprotein (oxLDL) on the DDAH/ADMA/NO pathway in human umbilical artery endothelial cells (HUAEC). HUAEC were exposed to estradiol, native LDL (nLDL), oxLDL and their combinations for 24 h. In some experiments, cells were also exposed to the unspecific estrogen receptor (ER) antagonist ICI 182780, the specific ERα antagonist MPP or specific agonists …

Estradiol Stimulates Vasodilatory and Metabolic Pathways in Cultured Human Endothelial Cells

2009

Vascular effects of estradiol are being investigated because there are controversies among clinical and experimental studies. DNA microarrays were used to investigate global gene expression patterns in cultured human umbilical vein endothelial cells (HUVEC) exposed to 1 nmol/L estradiol for 24 hours. When compared to control, 187 genes were identified as differentially expressed with 1.9-fold change threshold. Supervised principal component analysis and hierarchical cluster analysis revealed the differences between control and estradiol-treated samples. Physiological concentrations of estradiol are sufficient to elicit significant changes in HUVEC gene expression. Notch signaling, actin cyt…

The early response of the postmenopausal endometrium to tamoxifen: expression of estrogen receptors, progesterone receptors, and Ki-67 antigen

2003

OBJECTIVE To enlighten the early response of endometrium to tamoxifen by assessing the expression of estrogen receptors, progesterone receptors, Ki-67, and the histological response in endometria from normal postmenopausal women treated for 21 days with tamoxifen. DESIGN A total of 40 women, scheduled to undergo vaginal hysterectomy because of uterine prolapse, were randomly assigned to the tamoxifen group (20 mg/day; 20 women) or the control group (20 women). Samples were obtained from the upper and the lower thirds of the uterine cavity. Standard immunohistochemical staining of estrogen and progesterone receptors and of Ki-67 was performed on frozen sections. Staining was assessed using s…

Catechol-O-Methyltransferase Gene Polymorphism Is Associated with Skeletal Muscle Properties in Older Women Alone and Together with Physical Activity

2008

BackgroundMuscle strength declines on average by one percent annually from midlife on. In postmenopausal women this decrement coincides with a rapid decline in estrogen production. The genetics underlying the effects of estrogen on skeletal muscle remains unclear. In the present study, we examined whether polymorphisms within COMT and ESR1 are associated with muscle properties and assessed their interaction and their combined effects with physical activity.Methodology/principal findingsA cross-sectional data analysis was conducted with 434 63-76-year-old women from the population-based Finnish Twin Study on Aging. Body anthropometry, muscle cross-sectional area (mCSA), isometric hand grip a…

Plausible Role of Estrogens in Pathogenesis, Progression and Therapy of Lung Cancer

2021

Malignant neoplasms are among the most common diseases and are responsible for the majority of deaths in the developed world. In contrast to men, available data show a clear upward trend in the incidence of lung cancer in women, making it almost as prevalent as breast cancer. Women might be more susceptible to the carcinogenic effect of tobacco smoke than men. Furthermore, available data indicate a much more frequent mutation of the tumor suppressor gene-p53 in non-small cell lung cancer (NSCLC) female patients compared to males. Another important factor, however, might lie in the female sex hormones, whose mitogenic or carcinogenic effect is well known. Epidemiologic data show a correlatio…