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https://www.readbyqxmd.com/read/29036769/the-management-of-irregular-bleeding-in-women-using-contraception
#1
Terri Foran
BACKGROUND: The pattern of menstrual bleeding seen in women during their reproductive years is the result of a finely tuned balance be-tween endogenous oestrogens, which stimulate the endometrial lining, and progesterone, which temporarily maintains that lining in anticipation of a pregnancy. Many women have expectations of a 'normal monthly' cycle, and may be wary of any-thing that has the potential to disrupt its regularity. From a clinical perspective, any alteration in vaginal bleeding may indicate underlying pathology, and lead to further investigation and management...
October 2017: Australian Family Physician
https://www.readbyqxmd.com/read/29036275/porcupine-dependent-wnt-activity-within-the-uterine-epithelium-is-essential-for-fertility
#2
Omar Farah, Steffen Biechele, Janet Rossant, Daniel Dufort
The secretion of mammalian Wnt ligands within the cell is dependent on the activity of Porcupine, a gene located on the X-chromosome that encodes for a membrane bound o-acyl transferase. Here, we report that post-natal ablation of Porcupine in the uterine luminal epithelium alone results in the decrease in endometrial gland number. Despite having uterine glands, mutant females are completely infertile. Epithelial ablation of Porcupine causes defects in timely apposition of the lumen, along with failure to respond to artificial decidual induction...
October 4, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29036259/autoimmune-progesterone-dermatitis-a-diagnosis-to-consider-in-a-patient-with-cyclical-cutaneous-eruptions
#3
Alexa B Steuer, Sharon Scherl, Robin Ashinoff
Autoimmune progesterone dermatitis (APD) is a cyclical cutaneous reaction to progesterone, with symptoms that typically begin 3-10 days before the onset of menstrual flow and end 1-2 days into menses. The symptoms vary in severity from barely visible to anaphylaxis, but most often include an eczematous eruption, erythema multiforme, urticaria, folliculitis, and angioedema. This is a rare disorder with only a handful of documented cases. The pathogenesis of this condition remains unknown and significant variations in the presentation and severity of symptoms complicates its diagnosis...
October 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29035836/effect-of-initial-gnrh-and-time-of-insemination-on-reproductive-performance-in-cyclic-and-acyclic-beef-heifers-subjected-to-a-5-d-co-synch-plus-progesterone-protocol
#4
I López Helguera, P Whittaker, A Behrouzi, R J Mapletoft, M G Colazo
This study evaluated the effect of initial GnRH and timing of AI in a 5-d Co-synch plus CIDR (device containing 1.38 g of progesterone) protocol on pregnancy per AI (P/AI) and pregnancy loss in beef heifers. A secondary objective was to determine if the effect of initial GnRH on reproductive performance was influenced by cyclicity. Crossbred beef heifers (n = 1068; 301-514 kg of body weight, and 13-15 mo of age) at three locations were assigned to either a 5-d Co-synch plus CIDR protocol with (CIDR5G) or without (CIDR5NG) an initial injection of 100 μg of GnRH at CIDR insertion (Day 0)...
October 7, 2017: Theriogenology
https://www.readbyqxmd.com/read/29035835/nerve-growth-factor-beta-purified-from-bull-seminal-plasma-enhances-corpus-luteum-formation-and-conceptus-development-in-bos-taurus-cows
#5
Jamie L Stewart, Vitor R G Mercadante, Nicholas W Dias, Igor F Canisso, Peter Yau, Brian Imai, Fabio S Lima
The objective of the current study was to determine if Nerve Growth Factor-Beta (NGF), purified from bovine seminal plasma, would improve corpus luteum function and enhance conceptus development when administered to cows at artificial insemination. Angus cows (n = 60) were synchronized using a GnRH-prostaglandin and intravaginal progesterone protocol (7-day CO-Synch/CIDR) and randomly allocated to 1 of 2 treatment groups: (1) CONT- 12 mL PBS; or (2) NGF- 296 μg purified NGF in 12 mL PBS administered intramuscularly at insemination (day 0)...
October 7, 2017: Theriogenology
https://www.readbyqxmd.com/read/29034506/microglial-induced-m%C3%A3-ller-cell-gliosis-is-attenuated-by-progesterone-in-a-mouse-model-of-retinitis-pigmentosa
#6
Sarah L Roche, Ana M Ruiz-Lopez, Jennifer N Moloney, Ashleigh M Byrne, Thomas G Cotter
Norgestrel, a progesterone analogue, has demonstrated neuroprotective effects in a mouse model of retinitis pigmentosa. Neuroprotection is achieved in part through Norgestrels anti-inflammatory properties, alleviating detrimental microglial activity. Gliosis is a feature of many neurodegenerative diseases of the retina, including retinitis pigmentosa. Müller glia, a type of macroglia found in the retina, are major contributors of gliosis, characterized by the upregulation of glial fibrillary acidic protein (GFAP)...
October 16, 2017: Glia
https://www.readbyqxmd.com/read/29034469/effect-of-mono-2-ethylhexyl-phthalate-mehp-on-proliferation-of-and-steroid-hormone-synthesis-in-rat-ovarian-granulosa-cells-in-vitro
#7
Na Li, Te Liu, Kun Guo, Jian Zhu, Guangyan Yu, Shuyue Wang, Lin Ye
This study aimed to examine the proliferation of and secretion by rat ovarian granulosa cells (GCs) treated with mono-(2-ethylhexyl) phthalate (MEHP). Ovarian GCs were incubated with MEHP at concentration of 0, 25, 50, 100, and 200µM for 24 hours. Cell viability was determined using the MTT Cell Proliferation Assay. Progesterone and estradiol production was evaluated by radioimmunoassay (RIA) and the expression of FSHR, PR, and ER was measured by immunocytochemistry. StAR, P450scc, 3β-HSD, 17β-HSD, and P450 arom mRNA levels were determined by RT-PCR...
October 15, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29033885/emotions-and-steroid-secretion-in-aging-men-a-multi-study-report
#8
Andreas Walther, Patricia Waldvogel, Emilou Noser, Jessica Ruppen, Ulrike Ehlert
Although aging increases the risk of cognitive and socioemotional deterioration, it has also been shown to be accompanied by an increase in experienced positive emotions and a decrease in negative emotions. Steroid hormones and age-related alterations in secretion patterns have been suggested to play a crucial role in these age-related changes in emotional experience. Importantly, previous studies identified effects of neuroactive hormones on age-related alterations in emotional experience, which vary by sex and depression levels...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29033104/progesterone-releasing-devices-for-cattle-estrus-induction-and-synchronization-device-optimization-to-anticipate-shorter-treatment-durations-and-new-device-developments
#9
W de Graaff, B Grimard
Synchronization programs using progesterone-releasing intravaginal devices that allow for fixed time artificial insemination are still finding increasing application in bovine reproduction. This practice is useful for rationalizing livestock management because an increased number of cows can be inseminated in one session without the need for estrus detection. Although much of the innovation related to the design and development of intravaginal devices for use in cattle took place in the previous century, progress in understanding the physiology of the bovine estrous cycle resulted in shorter treatment durations, a trend which is still continuing...
September 27, 2017: Theriogenology
https://www.readbyqxmd.com/read/29032250/of-mice-and-women-a-laparoscopic-mouse-model-for-endometriosis
#10
Daniëlle Peterse, M Mercedes Binda, Dorien F O, Arne Vanhie, Amelie Fassbender, Joris Vriens, Thomas M D'Hooghe
OBJECTIVE: To demonstrate how a novel laparoscopic approach allows the development of a mouse model for endometriosis after seeding menstrual endometrium from donor mice into the abdominal cavity of syngeneic recipient mice. DESIGN: A step-by-step video description of the techniques used to adapt the estrous cycle of mice towards a menstrual cycle and to subsequently induce endometriosis via laparoscopic seeding of menstrual endometrium. SETTING: University research institute ETHICS: All experiments were ethically approved by KU Leuven, Belgium (ethical approval number: P031/2013)...
October 12, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29031956/the-solubility-permeability-trade-off-of-progesterone-with-cyclodextrins-under-physiological-conditions-experimental-observations-and-computer-simulations
#11
Le Sun, Bing Zhang, Jin Sun
This study intended to evaluate the effect of cyclodextrins on the apparent solubility and permeability of lipophilic drugs under physiological conditions and establish in silico model to choose the optimal amount of cyclodextrins for cyclodextrin-containing oral formulations. In order to study the effect of cyclodextrins under physiological conditions, bile salts and lecithin were added into the rat intestinal perfusion solution to simulate the fasted intestinal fluid. In addition, the in vivo oral absorption performances of cyclodextrin-containing formulations were simulated by gastrointestinal simulation technology based on the advanced compartmental absorption and transit model (ACAT)...
October 12, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29031893/in-an-in-vitro-model-using-human-fetal-membranes-17-%C3%AE-hydroxyprogesterone-caproate-is-not-an-optimal-progestogen-for-inhibition-of-fetal-membrane-weakening
#12
Deepak Kumar, Robert M Moore, Brian M Mercer, Joseph M Mansour, Sam Mesiano, Frederick Schatz, Charles J Lockwood, John J Moore
BACKGROUND: The progestogen 17-α hydroxyprogesterone caproate (17-OHPC) is one of only two agents recommended for clinical use in the prevention of spontaneous preterm delivery, and studies of its efficacy have been conflicting. We have developed an in-vitro model to study the fetal membrane weakening process that leads to rupture in preterm premature rupture of the fetal membranes (pPROM). Inflammation/infection associated with tumor necrosis factor-α (TNF-α) induction and decidual bleeding/abruption associated thrombin release are leading causes of pPROM...
October 11, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29031688/vitamin-d-deficiency-is-associated-with-poor-breast-cancer-prognostic-features-in-postmenopausal-women
#13
Benedito de Sousa Almeida-Filho, Heloisa De Luca Vespoli, Eduardo Carvalho Pessoa, Murilo Machado, Jorge Nahas-Neto, Eliana Aguiar Petri Nahas
This study aimed to evaluate the association between pretreatment vitamin D (VD) deficiency with breast cancer prognostic features in Brazilian postmenopausal women. An analytical cross sectional study was conducted with 192 women, aged 45-75 years, attended at University Hospital. Women with recent diagnosis of breast cancer, in amenorrhea >12months and age ≥45 years, without medication use or clinical conditions that interfere with VD values were included. Clinical and anthropometric data were collected...
October 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29030260/cyanidin-3-o-glucoside-promotes-the-biosynthesis-of-progesterone-through-the-protection-of-mitochondrial-function-in-pb-exposed-rat-leydig-cells
#14
Luona Wen, Xinwei Jiang, Jianxia Sun, Xia Li, Xusheng Li, Lingmin Tian, Ye Li, Weibin Bai
Cyanidin-3-O-glucoside (C3G) is an anthocyanin that has been reported to reduce the toxicity of heavy metals. In the present study, the protection effects of C3G on the biosynthesis of progesterone, the precursor of testosterone, against lead (Pb) in R2C rat Leydig cells were examined. Treatment of R2C cells with 100 μM Pb resulted in a significant decrease in progesterone production. After being cultured in a medium containing C3G and Pb, R2C cells exhibited an increase in progesterone concentration compared with the Pb treatment, as a result of up-regulation of the expression of the steroidogenic enzymes steroidogenic acute regulatory protein (StAR), 3β-hydroxysteroid dehydrogenase (3β-HSD) and cytochrome P450 enzyme cholesterol side chain cleavage enzyme (CYP11A1)...
October 10, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29030144/regulation-of-the-membrane-structure-by-brassinosteroids-and-progesterone-in-winter-wheat-seedlings-exposed-to-low-temperature
#15
Maria Filek, Elżbieta Rudolphi-Skórska, Apolonia Sieprawska, Miroslav Kvasnica, Anna Janeczko
Steroids constitute one of the most important groups of compounds of regulatory properties both in the animal and plant kingdom. In plants, steroids such as brassinosteroids or progesterone, by binding to protein receptors in cell membranes, regulate growth and initiate processes leading to increased tolerance to stress conditions. Due to their structural similarities to sterols, these steroids may also directly interact with cellular membranes. Our aim was to determine the changes of the structural parameters of lipid membranes under the influence of hydrophobic steroid compounds, i...
October 10, 2017: Steroids
https://www.readbyqxmd.com/read/29030126/the-pesticide-lindane-induces-dose-dependent-damage-to-granulosa-cells-in-an-in-vitro-culture
#16
Maria Grazia Palmerini, Gulmira Zhurabekova, Aru Balmagambetova, Stefania Annarita Nottola, Selenia Miglietta, Manuel Belli, Serena Bianchi, Sandra Cecconi, Valentina Di Nisio, Giuseppe Familiari, Guido Macchiarelli
Lindane, which is one of the most persistent organochlorine pesticide contaminating the Aral Sea region, is associated with numerous pathologies of the female reproductive system, including infertility, due to its gap junction blocker activity. By using an in vitro model of reproductive toxicity consisting of mouse parietal granulosa cells (GCs) exposed to increasing concentrations of Lindane ranging from 1 to 100μM (L1; L10; L100), we aimed to ascertain the Lindane toxicity by evaluating the ultrastructure and expression of the cell death protein p53...
October 10, 2017: Reproductive Biology
https://www.readbyqxmd.com/read/29029875/oxytocin-is-not-involved-in-luteolysis-and-early-maternal-recognition-of-pregnancy-mrp-in-alpacas
#17
Michela Ciccarelli, Muhammad Salman Waqas, James K Pru, Ahmed Tibary
Pregnancy maintenance depends on the maternal recognition of pregnancy (MRP), a physiological process by which the lifespan of the corpus luteum is prolonged. This mechanism is not well characterized in camelids. The objectives of the present research were to determine if exogenous oxytocin prolongs the corpus luteum activity in alpacas and to evaluate expression and localization of oxytocin receptors within the endometrium at 9 and 14days post-mating. In the oxytocin studies, plasma progesterone profiles were determined after ovulation in the same alpacas on 2 cycles: one cycle without oxytocin treatment and one cycle with oxytocin treatment...
October 6, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29029640/breast-carcinomas-with-low-amplified-equivocal-her2-by-ish-potential-supporting-role-of-multiplex-ligation-dependent-probe-amplification
#18
Cristiana Ercolani, Caterina Marchiò, Anna Di Benedetto, Alessandra Fabi, Letizia Perracchio, Patrizia Vici, Francesca Sperati, Simonetta Buglioni, Vincenzo Arena, Edoardo Pescarmona, Anna Sapino, Irene Terrenato, Marcella Mottolese
BACKGROUND: This is a retrospective cross sectional study aimed to verify whether Multiplex Ligation-dependent Probe Amplification (MLPA), a quantitative molecular assay, may represent a valuable reflex test in breast cancer with equivocal HER2 expression by immunohistochemistry and HER2 gene signals/nucleus (s/n) ranging between 4.0 and 5.9 by in situ hybridization. METHODS: A series of 170 breast carcinomas scored as 2+ for HER2 expression by immunohistochemistry, were selected from our files and analyzed in parallel by silver in situ hybridization and by MLPA...
October 13, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/29029054/prostaglandin-endoperoxide-synthase-1-ptgs1-mediates-the-timing-of-parturition-in-mice-despite-unhindered-uterine-contractility
#19
Jennifer L Herington, Christine O'Brien, Michael F Robuck, Wei Lei, Naoko Brown, J Chris Slaughter, Bibhash C Paria, Anita Mahadevan-Jansen, Jeff Reese
Cyclooxygenase (COX)-derived prostaglandins stimulate uterine contractions and prepare the cervix for parturition. Prior reports suggest Cox-1 (Ptgs1) knockout (KO) mice exhibit delayed parturition due to impaired luteolysis, yet the mechanism for late-onset delivery remains unclear. Here, we examined key factors for normal onset of parturition to determine whether any could account for the delayed parturition phenotype. Pregnant Cox-1KO mice did not display altered timing of embryo implantation or post-implantation growth...
September 29, 2017: Endocrinology
https://www.readbyqxmd.com/read/29029020/the-endometrial-polarity-paradox-differential-regulation-of-polarity-within-secretory-phase-human-endometrium
#20
Sarah Whitby, Lois A Salamonsen, Jemma Evans
A major cause of infertility in normal and assisted reproduction cycles is failure of the endometrium to undergo appropriate changes during the secretory phase of the menstrual cycle as it acquires receptivity for an implanting blastocyst. Current dogma states that loss of epithelial polarity in the luminal epithelial cells, the point of first contact between maternal endometrium and blastocyst, may facilitate embryo implantation. Loss of polarity is likely an important change during the secretory phase to overcome mutual repulsion between otherwise polarised epithelial surfaces...
September 29, 2017: Endocrinology
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