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Progestin Estrogenic Activity

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1. The Proliferative Response to p27 Down-Regulation in Estrogen Plus Progestin Hormonal Therapy is Lost in Breast Tumors Full Text available with Trip Pro

The Proliferative Response to p27 Down-Regulation in Estrogen Plus Progestin Hormonal Therapy is Lost in Breast Tumors Increased proliferation and breast cancer risk has been observed in postmenopausal women receiving estrogen (E) + progestin hormone replacement therapy (HRT). Progestin action is mediated through two progesterone receptor (PR) isoforms, PRA and PRB, with unique transcriptional activity and function. The current study examines hormonal regulation of PR isoforms in the normal (...) postmenopausal human breast and the mechanism by which progestins increase proliferation and breast cancer risk. Archival benign breast biopsies from postmenopausal and premenopausal women, and luminal breast tumor biopsies from postmenopausal women, were analyzed for regulation of PRA and PRB expression by E and E+medroxyprogesterone acetate (MPA). In the postmenopausal breast without HRT, PRA and PRB expression was decreased compared to the premenopausal breast. Both E (n = 12) and E+MPA (n = 13) HRT

2018 Translational oncology

2. Progestin Estrogenic Activity

Progestin Estrogenic Activity Progestin Estrogenic Activity Toggle navigation Brain Head & Neck Chest Endocrine Abdomen Musculoskeletal Skin Infectious Disease Hematology & Oncology Cohorts Diagnostics Emergency Findings Procedures Prevention & Management Pharmacy Resuscitation Trauma Emergency Procedures Ultrasound Cardiovascular Emergencies Lung Emergencies Infectious Disease Pediatrics Neurologic Emergencies Skin Exposure Miscellaneous Abuse Cancer Administration 4 Progestin Estrogenic (...) Activity Progestin Estrogenic Activity Aka: Progestin Estrogenic Activity , Estrogenic Activity II. General Most s have some anti- activity Several s have weak effect III. Characteristics Conditions associated with High Estrogenic Activity tenderness or engorgement s Moodiness Weight Gain Heavy Conditions associated with Low Estrogenic Activity Break-through bleeding in first 9 days of cycle Break-through bleeding throughout month too light IV. Progestins with significant Estrogenic Activity activity

2018 FP Notebook

3. Comparing the androgenic and estrogenic properties of progestins used in contraception and hormone therapy Full Text available with Trip Pro

and efficacies of selected progestins from different generations determined in parallel. We show that the progestins bind to the androgen receptor (AR) with similar affinities to each other and progesterone, while none bind estrogen receptor (ER)-β, and only norethisterone acetate, levonorgestrel and gestodene bind ERα. Comparative dose-response analysis revealed that progestins from the first three generations display similar androgenic activity to the natural androgen dihydrotestosterone (...) Comparing the androgenic and estrogenic properties of progestins used in contraception and hormone therapy Progestins used in endocrine therapies bind to multiple steroid receptors and are associated with several side-effects. It is thus important to understand the relationship between steroid receptor cross-reactivity and the side-effect profile of progestins. In cell lines that express negligible levels of steroid receptors, we report for the first time the binding affinities, potencies

2017 Biochemical and biophysical research communications

4. Modulatory Effect of Fermented Papaya Extracts on Mammary Gland Hyperplasia Induced by Estrogen and Progestin in Female Rats Full Text available with Trip Pro

receiving 30, 15, or 5 ml/kg FPEs). Severe mammary gland hyperplasia was induced upon estradiol benzoate and progestin administration. FPEs could improve the pathological features of the animal model and reduce estrogen levels in the serum. Analysis of oxidant indices revealed that FPEs could increase superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities, decrease malondialdehyde (MDA) level in the mammary glands and serum of the animal models, and decrease the proportion of cells (...) Modulatory Effect of Fermented Papaya Extracts on Mammary Gland Hyperplasia Induced by Estrogen and Progestin in Female Rats Fermented papaya extracts (FPEs) are obtained by fermentation of papaya by Aspergillus oryzae and yeasts. In this study, we investigated the protective effects of FPEs on mammary gland hyperplasia induced by estrogen and progestogen. Rats were randomly divided into 6 groups, including a control group, an FPE-alone group, a model group, and three FPE treatment groups (each

2017 Oxidative medicine and cellular longevity

5. Comparison of Estrogen-progestin Therapy in Continuous Regimen Versus Combination Estrogen-progestin Therapy in Continuous Regimen Plus Levonorgestrel-releasing Intrauterine System (LNG-IUS)

Comparison of Estrogen-progestin Therapy in Continuous Regimen Versus Combination Estrogen-progestin Therapy in Continuous Regimen Plus Levonorgestrel-releasing Intrauterine System (LNG-IUS) Comparison of Estrogen-progestin Therapy in Continuous Regimen Versus Combination Estrogen-progestin Therapy in Continuous Regimen Plus Levonorgestrel-releasing Intrauterine System (LNG-IUS) - Full Text View - ClinicalTrials.gov Hide glossary Glossary Study record managers: refer to the if submitting (...) registration or results information. Search for terms x × Study Record Detail Saved Studies Save this study Warning You have reached the maximum number of saved studies (100). Please remove one or more studies before adding more. Comparison of Estrogen-progestin Therapy in Continuous Regimen Versus Combination Estrogen-progestin Therapy in Continuous Regimen Plus Levonorgestrel-releasing Intrauterine System (LNG-IUS) The safety and scientific validity of this study is the responsibility of the study

2015 Clinical Trials

6. Resveratrol ameliorates prenatal progestin exposure-induced autism-like behavior through ERβ activation Full Text available with Trip Pro

Resveratrol ameliorates prenatal progestin exposure-induced autism-like behavior through ERβ activation Recent literatures indicate that maternal hormone exposure is a risk factor for autism spectrum disorder (ASD). We hypothesize that prenatal progestin exposure may counteract the neuroprotective effect of estrogen and contribute to ASD development, and we aim to develop a method to ameliorate prenatal progestin exposure-induced autism-like behavior.Experiment 1: Prenatal progestin exposure (...) were used for prenatal exposure in pregnant dams, and the offspring showed decreased ERβ expression in the amygdala with autism-like behavior. Oral administration of either postnatal or prenatal RSV treatment significantly reversed this effect with ERβ activation and ameliorated autism-like behavior. Further investigation showed that RSV activates ERβ and its target genes by demethylation of DNA and histone on the ERβ promoter, and then minimizes progestin-induced oxidative stress as well

2018 Molecular autism

7. From the women's health initiative to the combination of estrogen and selective estrogen receptor modulators to avoid estrogen-progestin association. (Abstract)

From the women's health initiative to the combination of estrogen and selective estrogen receptor modulators to avoid estrogen-progestin association. The female life expectancy rose from an average of 48 years to over 80 years in a century. The decline in the endogenous production of estrogen (especially the main circulating physiological hormone, 17β-estradiol, E2) at menopause (51 years on average) often leads to functional disorders affecting the quality of life. Estrogen deficiency impacts (...) , medroxyprogesterone acetate (MPA). Hormone therapy, particularly the conjugated equine estrogen (CEE) combined with the MPA favor the occurrence of breast cancer, whereas conversely selective estrogen receptor modulators (SERMs, such as tamoxifen or raloxifene) that block the activity of estrogen receptor alpha (ERa) prevent the risk of recurrence of ERa-positive breast cancers. A new strategy of ERa modulation called tissue selective estrogen complex (TSEC), combines (1) CEE to maintain the benefits of estrogen

2015 Maturitas

8. Tissue Factor Pathway Inhibitor, Activated Protein C Resistance, and Risk of Coronary Heart Disease Due To Combined Estrogen Plus Progestin Therapy. Full Text available with Trip Pro

Tissue Factor Pathway Inhibitor, Activated Protein C Resistance, and Risk of Coronary Heart Disease Due To Combined Estrogen Plus Progestin Therapy. To examine whether tissue factor pathway inhibitor or acquired activated protein C (APC) resistance influences the increased risk of coronary heart disease (CHD) due to estrogen plus progestin therapy.Prospective nested case-control study of 205 cases of CHD and 481 matched controls in the Women's Health Initiative randomized trial of estrogen plus (...) progestin therapy. After multivariable covariate adjustment, both baseline tissue factor pathway activity (P=0.01) and APC resistance (P=0.004) were associated positively with CHD risk. Baseline tissue factor pathway activity and APC resistance singly or jointly did not significantly modify the effect of estrogen plus progestin on CHD risk. Compared with placebo, estrogen plus progestin decreased tissue factor pathway inhibitor activity and increased APC resistance but these changes did not seem

2015 Thrombosis and Vascular Biology Controlled trial quality: uncertain

9. Colorectal tumor prevention by the progestin medroxyprogesterone acetate is critically dependent on postmenopausal status Full Text available with Trip Pro

Colorectal tumor prevention by the progestin medroxyprogesterone acetate is critically dependent on postmenopausal status The large randomized placebo controlled trials of the Women's Health Initiative have shown that the combination of estrogen and progestin medroxyprogesterone acetate (MPA) protects from colorectal cancer in postmenopausal women. No effect was observed in women treated with estrogen alone. This suggests that progesterone, or more specifically the progestin MPA may have (...) chemopreventive activity. The effect of MPA on colorectal carcinogenesis has been difficult to study in animal models. Most models are not affected by either depleting female hormones by ovariectomy or treatment with MPA. Importantly, an ovariectomy fails to reproduce one of the hall marks of the postmenopausal state in women with intact ovaries. That is, the continued production of androgens by the atrophic postmenopausal ovaries. Here we show that adenoma incidence is increased in the vinyl cylcohexene

2018 Oncotarget

10. Progestin Estrogenic Activity

Progestin Estrogenic Activity Progestin Estrogenic Activity Toggle navigation Brain Head & Neck Chest Endocrine Abdomen Musculoskeletal Skin Infectious Disease Hematology & Oncology Cohorts Diagnostics Emergency Findings Procedures Prevention & Management Pharmacy Resuscitation Trauma Emergency Procedures Ultrasound Cardiovascular Emergencies Lung Emergencies Infectious Disease Pediatrics Neurologic Emergencies Skin Exposure Miscellaneous Abuse Cancer Administration 4 Progestin Estrogenic (...) Activity Progestin Estrogenic Activity Aka: Progestin Estrogenic Activity , Estrogenic Activity II. General Most s have some anti- activity Several s have weak effect III. Characteristics Conditions associated with High Estrogenic Activity tenderness or engorgement s Moodiness Weight Gain Heavy Conditions associated with Low Estrogenic Activity Break-through bleeding in first 9 days of cycle Break-through bleeding throughout month too light IV. Progestins with significant Estrogenic Activity activity

2015 FP Notebook

11. Progestin-mediated activation of MAPK and AKT in nuclear progesterone receptor negative breast epithelial cells: the role of membrane progesterone receptors Full Text available with Trip Pro

Progestin-mediated activation of MAPK and AKT in nuclear progesterone receptor negative breast epithelial cells: the role of membrane progesterone receptors Progesterone (P4), a steroid produced during estrous cycles and gestation for maintenance of pregnancy, also plays key roles in breast development to allow lactation post-parturition. Progestins (P4 and related steroids) are also implicated in breast cancer etiology. Hormone replacement therapy containing both estrogen and progestins (...) increases breast cancer incidence while estrogen hormone therapy lowers breast cancer risk. P4 signaling via nuclear P4 receptors (PRs) has been extensively studied in breast cancer, however, progestin signaling via non-classical membrane bound progestin receptors (MPRs and PGRMC1) remains unclear. Moreover, P4 metabolites and synthetic progestins may bind membrane progestin receptors. We hypothesized that PR-negative breast epithelial cells express non-classical progestin receptors, which activate

2016 Gene

12. Natural and synthetic progestins enrich cancer stem cell-like cells in hormone-responsive human breast cancer cell populations in vitro Full Text available with Trip Pro

Natural and synthetic progestins enrich cancer stem cell-like cells in hormone-responsive human breast cancer cell populations in vitro Clinical trials and studies have shown that combination estrogen/progestin hormone replacement therapy, but not estrogen therapy alone or placebo, increases breast cancer risk in postmenopausal women. Using animal models, we have previously shown that both natural and synthetic progestins (including medroxyprogesterone acetate [MPA], a synthetic progestin used (...) that MPA failed to induce CD44 protein expression, confirming that PR is essential for progestin-mediated CD44 induction in T47-D cells. Further, MPA treatment of T47-D cells significantly increased the activity of aldehyde dehydrogenase (ALDH), another CSC marker. Finally, two synthetic progestins, MPA and norethindrone, significantly increased the ability of T47-D cells to form mammospheres, suggesting that enrichment of the CD44high, ALDHbright subpopulation of cancer cells induced by MPA exposure

2017 Breast Cancer : Targets and Therapy

13. Cholesterol biosynthesis inhibitor RO 48-8071 reduces progesterone receptor expression and inhibits progestin-dependent stem cell-like cell growth in hormone-dependent human breast cancer cells Full Text available with Trip Pro

Cholesterol biosynthesis inhibitor RO 48-8071 reduces progesterone receptor expression and inhibits progestin-dependent stem cell-like cell growth in hormone-dependent human breast cancer cells Clinical trials and studies have shown that postmenopausal women undergoing combination hormone replacement therapy containing estrogen and progestin have an increased risk of breast cancer compared with women taking estrogen or placebo alone. Using animal models, we have previously shown that synthetic (...) progestins, including medroxyprogesterone acetate (MPA), which is widely used clinically, accelerate breast cancer tumor growth and promote metastasis. Furthermore, we have found that MPA elevates CD44 protein expression and aldehyde dehydrogenase (ALDH) activity, two markers of cancer stem cells (CSCs), and increases mammosphere formation, another hallmark of stem cells, in hormone-dependent T47-D human breast cancer cells. Herein, we show that RO 48-8071 (RO), an inhibitor of cholesterol synthesis

2017 Breast Cancer : Targets and Therapy

14. Progesterone receptor membrane component 1 is phosphorylated upon progestin treatment in breast cancer cells Full Text available with Trip Pro

Progesterone receptor membrane component 1 is phosphorylated upon progestin treatment in breast cancer cells Menopausal hormone therapy, using estrogen and synthetic progestins, is associated with an increased risk of developing breast cancer. The effect of progestins on breast cells is complex and not yet fully understood. In previous in vitro and in vivo studies, we found different progestins to increase the proliferation of Progesterone Receptor Membrane Component-1 (PGRMC1)-overexpressing (...) MCF7 cells (MCF7/PGRMC1), suggesting a possible role of PGRMC1 in transducing membrane-initiated progestin signals. Understanding the activation mechanism of PGRMC1 by progestins will provide deeper insights into the mode of action of progestins on breast cells and the often-reported phenomenon of elevated breast cancer rates upon progestin-based hormone therapy. In the present study, we aimed to further investigate the effect of progestins on receptor activation in MCF7 and T47D breast cancer cell

2017 Oncotarget

15. Estrogen plus progestin increase SOD and total antioxidant capacity in postmenopausal women. (Abstract)

) or estrogen plus progestin therapy (EPT).Blood was collected from four groups of subjects: premenopausal women (n = 24), postmenopausal women without hormone therapy (n = 31), postmenopausal women with ET (n = 12) and postmenopausal women with EPT (n = 16).The activities of the different SOD isoforms (CuZnSOD and MnSOD) and the plasma total antioxidant power were significantly higher in the postmenopausal women under EPT than in the postmenopausal women without hormone replacement therapy (HRT). Only (...) Estrogen plus progestin increase SOD and total antioxidant capacity in postmenopausal women. This cross-sectional study aimed to evaluate the behavior of blood antioxidant enzymes (superoxide dismutase (SOD), catalase and glutathione peroxidase), plasma total antioxidant capacity and oxidative damage (lipid oxidation and protein carbonyl levels) and their relationship with the serum levels of steroid hormones in premenopausal and postmenopausal women without and with estrogen alone (ET

2014 Climacteric

16. Molecular modulation of estrogen-induced apoptosis by synthetic progestins in hormone replacement therapy: An insight into the Women’s Health Initiative study Full Text available with Trip Pro

combined estrogen plus a progestin (medroxyprogesterone acetate, MPA) HRT increases this risk. Long-term estrogen-deprived MCF-7:5C cells were used to model the postmenopausal breast cancer cell environment. MPA is able to modify E2-induced apoptosis in MCF-7:5C cells. MPA, similar to dexamethasone, increases glucocorticoid receptor (GR) transcriptional activity, increases SGK1, a GR target gene, and can be blocked by RU486 (an antiglucocorticoid), suggesting that it functions through the GR (...) Molecular modulation of estrogen-induced apoptosis by synthetic progestins in hormone replacement therapy: An insight into the Women’s Health Initiative study Hormone replacement therapy (HRT) is widely used to manage menopausal symptoms in women and can be comprised of an estrogen alone or an estrogen combined with a progestin. The Women's Health Initiative demonstrated in their randomized trials that estrogen alone HRT decreases the risk of breast cancer in postmenopausal women, whereas

2014 Cancer research

17. Hormone metabolism pathway genes and mammographic density change after quitting estrogen and progestin combined hormone therapy in the California Teachers Study. Full Text available with Trip Pro

Hormone metabolism pathway genes and mammographic density change after quitting estrogen and progestin combined hormone therapy in the California Teachers Study. Mammographic density (MD) is a strong biomarker of breast cancer risk. MD increases after women start estrogen plus progestin therapy (EPT) and decreases after women quit EPT. A large interindividual variation in EPT-associated MD change has been observed, but few studies have investigated genetic predictors of the EPT-associated MD (...) for correlated tests (P(ACT))' to account for multiple testing within a gene.The strongest associations were observed for rs7489119 in SLCO1B1, and rs5933863 in ARSC. SLCO1B1 and ARSC are involved in excretion and activation of estrogen metabolites of EPT, respectively. MD change after quitting was 4.2% smaller per minor allele of rs7489119 (P = 0.0008; P(ACT) = 0.018) and 1.9% larger per minor allele of rs5933863 (P = 0.013; P(ACT) = 0.025). These individual SNP associations did not reach statistical

2014 Breast cancer research : BCR

18. Breast tenderness and breast cancer risk in the estrogen plus progestin and estrogen-alone women's health initiative clinical trials. Full Text available with Trip Pro

Breast tenderness and breast cancer risk in the estrogen plus progestin and estrogen-alone women's health initiative clinical trials. The associations between breast tenderness during use of conjugated equine estrogen (CEE) therapy with or without medroxyprogesterone (MPA) therapy and subsequent breast cancer risk are unknown. We analyzed data from the Women's Health Initiative Estrogen plus Progestin (N = 16,608, 5.6 years intervention) and estrogen-alone (N = 10,739, 6.8 years intervention (...) ) clinical trials until trial close-out (Spring 2005). At baseline and annually, participants underwent mammography and clinical breast exam. Self-reported breast tenderness was assessed at baseline and 12 months. Invasive breast cancer was confirmed by medical record review. The risk of new-onset breast tenderness after 12 months was significantly higher among women assigned to active therapy than placebo (CEE-alone vs. placebo risk ratio [RR] 2.15, 95% confidence interval [CI] 1.97-2.35; CEE + MPA vs

2012 Breast cancer research and treatment Controlled trial quality: predicted high

19. Third Generation Progestin

as a contraceptive, ovulation inhibitor, and for the control of menstrual disorders and endometriosis. Definition (PDQ) A synthetic progestin commonly used alone or in combination with an estrogen for contraception. Norgestrel suppresses the secretion of luteinizing and follicle-stimulating hormones (LH and FSH), thickens cervical mucus, and slows the transit of ova through the fallopian tubes. This agent also exhibits antiproliferative activity in endometrial tissue and may exhibit chemopreventive (...) Generation Progestin Aka: Third Generation Progestin , Norgestrel , Levonorgestrel II. Class 19 Nor-Testosterone : Gonane III. Preparation: dl-Norgestrel Relative : 2.6 : 0 : 4.2 : 2.6 Anti- : Active Anabolic: Active Preparations (0.3/30) Ovral (0.5/50) ( ) (0.075) IV. Preparation: Levonorgestrel Relative : 5.3 : 0 : 8.3 : 5.1 Anti- : Active Anabolic: Active Preparations with (0.1/20) (0.15/30) (0.15/30) (0.15/30) (0.05/30 - 0.075/40 - 0.125/30) (0.15/30) - seasonal (0.09/20) - continuous V. Adverse

2018 FP Notebook

20. First Generation Progestin

Generation Progestin Aka: First Generation Progestin , Norethindrone , Norethynodrel II. Class 19 Nor-Testosterone : Estrane III. Norethindrone Relative : 1.0 : 1.0 : 1.0 : 1.0 Anti- : Active Preparations or (0.5/35) (0.4/35, 1/50) or Biphasic (0.5-1.0/35) Triphasic (0.5-0.75-1.0/35) Triphasic (0.5-1.0-0.5/35) (50 mcg is equivalent to 35 mcg estradiol) 1/50 Ortho-Novum 1/50 1/50 -1 (UK) -only ( ) , (0.35) IV. 50 µg Mestranol (equivalent to 35 µg Ethinyl Estradiol) V. 1000 µg Norethindrone (UK: Norinyl-1 (...) prices with suppliers. Prices shown here are out of pocket, non-negotiated rates. See for financial assistance information. Ontology: Norethindrone (C0028356) Definition (NCI) A synthetic progestational substance with some anabolic, estrogenic, and androgenic properties. Norethindrone binds to the progesterone intracellular receptors in the reproductive system and the resultant activated complex interacts with specific DNA sites. This leads to an alteration in protein synthesis and results

2018 FP Notebook

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