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Results 1251 - 1300 of 2087
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Vecchio D - - 2010
The aims of this study were to verify the efficacy of delayed hormonal treatments performed on day 25 post-insemination on pregnancy rate at 45 and 70 days in buffalo. The trial was performed on 385 buffaloes synchronized by the Ovsynch/TAI protocol and submitted to artificial insemination (AI). Twenty-five days after ...
D'Uva Maristella - - 2008
Recurrent fetal loss (RPL) is one of the most common cause of sterility. Several studies identified thrombophilia as the principal cause of recurrent pregnancy loss. However, reported studies often do not evaluate other causes of miscarriages in their inclusion and exclusion criteria. So the aim of our study was to ...
Stevenson J S - - 2008
The objective was to monitor changes in ovarian status in heifers exposed to a progesterone insert with or without concurrent GnRH injection. Estrus was manipulated in 283 heifers (31 breeding clusters) by administering GnRH, progesterone, and PGF(2alpha) at 5 stages of the estrous cycle. Estrus was presynchronized with a progesterone ...
Schwendener Severin - - 2009
Activation of maternal stress response systems during pregnancy has been associated with altered postpartum maternal care and subsequent abnormalities in the offspring's brain and behavioral development. It remains unknown, however, whether similar effects may be induced by exposure to immunological stress during pregnancy. The present study was designed to address ...
Song Gwonhwa - - 2009
Stanniocalcin 1 (STC1) is a glycoprotein that decreases calcium and increases phosphate in cells/tissues. This investigation examined endocrine regulation of STC1 in endometria of pigs during the estrous cycle and pregnancy. STC1 mRNA was present exclusively in luminal epithelium (LE) between d 12 and 15 of the estrous cycle, increased ...
Bolanca Ivan - - 2008
Chloasma is a required hypermelanosis of sun-exposed areas occurred during pregnancy and it can affect 50-70% of pregnant women. It presents as symmetric hyperpigmented macules, which can confluent or punctuate. The most common locations are the cheeks, the upper lip, the chin and the forehead. The exact mechanism by which ...
Tripp K M - - 2008
The objective was to validate a high-sensitivity chemiluminescent assay of serum progesterone concentrations for pregnancy diagnosis in manatees. Assay analytical sensitivity was 0.1 ng/mL, with mean intra- and inter-assay coefficients of variation of 9.7 and 9.2%, respectively, and accuracy had a mean adjusted R(2) of 0.98. Methods comparison (relative to ...
Järvelä Ilkka Y - - 2008
BACKGROUND: During early pregnancy, the most important task of the corpus luteum (CL) is to produce sufficient progesterone until the luteoplacental shift occurs. Progesterone production is closely related to the extensive vasculature surrounding and supplying the CL. The synthesis of both progesterone and factors controlling the vasculature in the CL ...
Harini Challa - - 2009
OBJECTIVE: To evaluate the effect of progesterone during early pregnancy on pregnancy maintenance in mice. DESIGN: Experimental study or laboratory investigation. SETTING: An established molecular reproduction laboratory, Department of Biotechnology, S.V. University. ANIMAL(S): Healthy virgin female Swiss albino mice of 8 weeks of age. INTERVENTION(S): After confirmation of the heat ...
Stevenson J S - - 2008
The objectives were to determine whether a single injection of either human chorionic gonadotropin (hCG) or GnRH would: 1) increase ancillary formation of new luteal structures, 2) increase serum concentrations of progesterone, and 3) increase pregnancy survival in dairy females treated once between 26 and 71 d of pregnancy. A ...
Choi Jae-hyek - - 2008
The enzyme 20alpha-hydroxysteroid dehydrogenase (20alpha-HSD) catabolizes progesterone into a biologically inactive steroid, 20alpha-dihydroprogesterone (20alpha-OHP). In the corpora lutea of rats and mice, 20alpha-HSD is considered to be involved in functional luteolysis. It is also distributed in other tissues including the placenta, endometrial epithelia and fetal skin, although the roles it ...
Solano Me - - 2008
Problem: Progesterone plays a central role during the maintenance of pregnancy. Our study aims to develop two hypoprogesteronic animal models using the 3beta-HSD inhibitor trilostane during early pregnancy. Material and Methods: Trilostane or vehicle was injected s.c. in DBA/2J-CBA/J female mice (4.5-8.5 dpc) or in ewes (5-16 day of pregnancy). ...
Dehnhard M - - 2008
The survival of many critical endangered mammal species is often depending on successful captive breeding programmes which include the future option of reintroduction to the wild. Breeding in captivity also demands the application of modern assisted reproductive techniques to ensure maximal biodiversity, but knowledge on reproductive physiology is often limited. ...
Verstegen-Onclin K - - 2008
Pregnancy regulation in the dog is not yet fully elucidated. Since plasma progesterone concentrations are similar in pregnant versus non-pregnant animals, it is a poor reflection on CL function and progesterone metabolism. Increased progesterone secretion by the CL in pregnant animals follows implantation and relaxin secretion by the feto-placental units. ...
Khan Naveed - - 2009
To evaluate vaginal compared to intramuscular (IM) progesterone supplementation for luteal phase support after in vitro fertilization and embryo transfer (IVF-ET). Retrospective matched-samples comparative study. Private infertility center. Two hundred forty patients undergoing IVF-ET. Patients received either vaginal progesterone supplementation in the form of Endometrin 100 mg twice a day ...
Stolarek R - - 2008
Since pregnancy is known to favor systemic generation of reactive oxygen species, this study was designed to assess the levels of exhaled hydrogen peroxide (eH2O2), serum progesterone (PG), 17beta-estradiol (E2) and systemic oxidative parameters in 20 pregnant women between 15th and 28th gestation week and 23 healthy, eumenorrheic women. Exhaled ...
Khoza T - - 2008
This study investigated the presence of carbohydrates N-acetyl-d-glucosamine and sialic acid oligosaccharides, in the uterine epithelium of pseudopregnant rats treated with ovarian hormones and Clomiphene citrate (CC) a commonly used fertility drug associated with low pregnancy rates. Ovariectomized sexually mature rats were given 0.25mg CC prior to the implantation-priming hormone ...
Li R - - 2008
To determine the relationship between serum progesterone on the day of human chorionic gonadotrophin (HCG) and the pregnancy outcome of IVF-embryo transfer treatment, 251 infertile patients undergoing IVF-embryo transfer with gonadotrophin-releasing hormone agonist (GnRHa) and recombinant FSH (rFSH) were prospectively studied. Among them, 118 patients underwent 118 cycles of frozen ...
El Bishry G - - 2008
Our aim was to test the use of single serum progesterone measurement together with beta hCG in the management of women with pregnancy of unknown location. This was a retrospective study of 126 patients presenting with a clinical picture suggestive of ectopic pregnancy, when ultrasound examination was inconclusive. All the ...
Plante Beth J - - 2008
OBJECTIVE: To develop a model to differentiate viable from nonviable pregnancies at a single first-trimester visit. STUDY DESIGN: This prospective cohort study included 256 symptomatic women in the first trimester who presented to our urgent care unit in Providence, Rhode Island, between 2002 and 2004. Predictors of pregnancy viability were ...
Andersson Stefan - - 2008
Experimental and clinical studies in a variety of nonprimate species demonstrate that progesterone withdrawal leads to changes in gene expression that initiate parturition at term. Mice deficient in 5alpha-reductase type I fail to undergo cervical ripening at term despite the timely onset of luteolysis and progesterone withdrawal in blood. Our ...
Steyn Frederik J - - 2008
Prolactin stimulates tuberoinfundibular dopamine neurons in the arcuate nucleus of the hypothalamus, mediated by signal transducer and activator of transcription 5b (STAT5b). During late pregnancy, these neurons become unresponsive to prolactin, with a loss of prolactin-induced activation of STAT5b and decreased dopamine secretion. Suppressors of cytokine signaling (SOCS) proteins inhibit ...
Dal Prato Luca - - 2008
The aim of this randomized study was to compare the efficacy of intramuscular progesterone (IMP) and progesterone in vaginal gel (VGP) at two different doses for luteal support in IVF. A total of 412 patients, aged between 28 and 37 years, were randomized into three groups. The day after oocyte ...
Tsubura Airo - - 2008
Early age at full-term pregnancy lowers the risk of breast cancer in women; lactation seems to be of marginal importance and aborted pregnancy is not associated with reduced risk. Although early full-term pregnancy provides protection against breast cancer, first full-term pregnancy in older women appears to increase the risk. The ...
McRobb L - - 2008
The recent identification of tetrahydrogestrinone (THG), a non-marketed designer androgen used for sports doping but previously undetectable by established mass spectrometry-based urine drug screens, and its production by a facile chemical modification of gestrinone has raised concerns about the risks of developing designer androgens from numerous marketed progestins. We therefore ...
Hurd William W - - 2008
OBJECTIVE: The purpose of this study was to determine whether stretching and shortening of human myometrial strips alters prostaglandin production. STUDY DESIGN: We measured 6-keto prostaglandin F1alpha (PGF1alpha; a PGI2 metabolite) and PGF2alpha in the contraction baths of myometrial strips that were obtained at cesarean delivery from 5 term pregnant ...
Spencer Thomas E - - 2008
This review summarizes new knowledge on expression of genes and provides insights into approaches for study of conceptus-endometrial interactions in ruminants with emphasis on the peri-implantation stage of pregnancy. Conceptus-endometrial interactions in ruminants are complex and involve carefully orchestrated temporal and spatial alterations in gene expression regulated by hormones from ...
Franco Heather L - - 2008
In order for a successful pregnancy to occur, the embryo must attach to the luminal epithelial cells and invade into the stroma. Then, the surrounding stromal cells need to undergo decidualization in order to establish the vasculature necessary for survival of the embryo. These events in early pregnancy are tightly ...
Jeong H H Department of Pharmacy Practice, College of Pharmacy, Universit of Illinois at Chicago, Chicago, IL 60612, - - 2008
The authors recently reported the increased oral clearance of labetalol in pregnant women. To elucidate the mechanism of the elevated oral clearance, it was hypothesized that female hormones, at the high concentrations attainable during pregnancy, enhance hepatic metabolism of labetalol. Labetalol glucuronidation, which is the major elimination pathway of labetalol, ...
Daya Salim - - 2008
The aspiration of the granulosa cells that surround the oocyte and the use of gonadotropin releasing hormone agonists (GnRHa) during assisted reproduction technology (ART) treatment can interfere with the production, during the luteal phase, of progesterone, which is necessary for successful implantation of the embryo. Providing hormonal supplementation during the ...
Wang Haibin - - 2008
Preterm birth accounting approximate 10% of pregnancies in women is a tremendous social, clinical and economic burden. However, its underlying causes remain largely unknown. Emerging evidence suggests that endocannabinoid signaling via cannabinoid receptor CB1 play critical roles in multiple early pregnancy events in both animals and humans. Since our previous ...
Szekeres-Bartho Julia - - 2008
Progesterone (P) has been widely used in an attempt to prevent threatened miscarriage, recurrent miscarriage and pre-term labour. Successful pregnancy depends on maternal tolerance of the fetal "semi-allograft". Along with its endocrine effects, P also acts as an "immunosteroid", by controlling the bias towards a pregnancy protective immune milieu. A ...
Patil Sadanand B - - 2008
The present study was designed to evaluate the lipid peroxidation and non-enzymatic antioxidants in pregnancyinduced hypertension (PIH) compared with healthy normal pregnant and non-pregnant as controls. 75 cases were studied of which 25 were normal healthy controls (Group A), 25 healthy pregnant women (Group B) of third trimester and 25 ...
Carter F - - 2008
Higher systemic progesterone in the immediate post-conception period is associated with an increase in embryonic growth rate, interferon-tau production and pregnancy rate in cattle. The objective of this study was to examine the effect of increasing progesterone concentration on Day 3 on subsequent embryo survival and development. Oestrus (Day 0) ...
Goktolga Umit - - 2008
OBJECTIVES: The aim of this study was to assess the predictive value of serum progesterone levels in early pregnancy prognosis in spontaneous dichorionic-diamniotic twin gestations. STUDY DESIGN: This study was carried out among 38 spontaneous dichorionic-diamniotic twin gestations between January 2003 and June 2005 in the Department of Obstetrics and ...
Sato Kazuyo - - 2008
Placental hydroxysteroid 11-beta dehydrogenase 2 (HSD11B2) plays an important role in pregnancy maintenance and fetal maturation. In the event of intrauterine infection, lipoxygenase (LOX) metabolites are produced in the placenta and contribute to preterm labor and adverse fetal outcomes. On the other hand, LOX metabolites are involved in production of ...
Monks Jenifer - - 2007
The molecular mechanisms controlling the onset of copious milk secretion are only now beginning to be elucidated. We have known for nearly four decades that progesterone suppresses milk secretion during pregnancy, and that the fall in progesterone near parturition is necessary for secretory activation. Similarly, we've known for 15 years ...
Walch Katharina T - - 2008
Recurrent miscarriage is known to affect 0.5-2% of pregnant women, and the standard investigative protocol fails to identify a specific cause in 50% of cases. Progesterone, a key hormone in pregnancy maintenance, has been used to support early pregnancy for decades. A growing body of considerable evidence indicates that in ...
Iwase Akira - - 2008
OBJECTIVES: To evaluate the efficacy of oral progestogen, chlormadinone acetate, and intramuscular (IM) progesterone for luteal support in patients, undergoing assisted reproductive technology (ART) treatment, who were treated with a gonadotropin-releasing hormone agonist (GnRHa). METHODS: This was a prospective randomized study of 40 patients with normal and high response (serum ...
Kancheva Radmila - - 2007
Pregnanolone isomers (PIs) and their polar conjugates (PICs) modulate ionotropic receptors such as gamma-aminobutyric acid or pregnane X receptors. Besides, brain synthesis, PI penetrates the blood-brain barrier. We evaluated the physiological importance of PI respecting the status of sex, menstrual cycle, and pregnancy. Accordingly, circulating levels of allopregnanolone (P3alpha 5alpha ...
Herzog Andrew G - - 2007
Migraine is 3 times more common in postpubertal women than in men. Migraine is frequently exacerbated perimenstrually and commonly occurs exclusively at that time. It is often benefited by pregnancy and menopause. Estrogen withdrawal has been implicated as a mechanism for triggering migraines. The mechanism, however, is not well understood. ...
Haddad Ghassan - - 2007
The optimal route of progesterone (P4) administration in embryo transfer (FET) cycles remains to be determined. The objective of this study is to compare the pregnancy outcomes between intramuscular (IM) and vaginal progesterone (PV) administration for endometrial preparation in non-donor FET cycles. A retrospective clinical study in a private practice ...
Trisolini C - - 2008
The aim of this study was to evaluate the physiological range of homocysteine (Hcy) exhibited by bitches during the follicular (pro-oestrus), luteal (dioestrus) and anoestrus phases of cycling animals, and in pregnant and spayed bitches. The lowest concentrations of Hcy were observed during dioestrus (3.2+/-1.27micromol/L) and in pregnant bitches (3.9+/-1.72micromol/L), ...
Alsayegh Abdul-Kareem - - 2007
Induction of labor is common in obstetric practice. According to the most current studies, the rate varies from 9.5 to 33.7 percent of all pregnancies annually. In the absence of a ripe or favorable cervix, a successful vaginal birth is less likely. Therefore, cervical ripening or preparedness for induction should ...
Tranguch Susanne - - 2007
Immunophilin FKBP52 serves as a cochaperone to govern normal progesterone (P(4)) receptor (PR) function. Using Fkbp52(-/-) mice, we show intriguing aspects of uterine P(4)/PR signaling during pregnancy. Implantation failure is the major phenotype found in these null females, which is conserved on both C57BL6/129 and CD1 backgrounds. However, P(4) supplementation ...
Yanushpolsky Elena - - 2008
This study was performed to compare the efficacy of Crinone 8% intravaginal gel and intramuscular progesterone (IMP) supplementation for luteal phase support in women under age 40 undergoing IVF-ET. Results of the interim analysis of this rigorously designed prospective randomized controlled study are presented. Pregnancy rates, implantation rates, and early ...
Mesiano Sam - - 2007
The precise temporal control of uterine contractility is essential for the success of pregnancy. For most of pregnancy, progesterone acting through genomic and non-genomic mechanisms promotes myometrial relaxation. At parturition the relaxatory actions of progesterone are nullified and the combined stimulatory actions of estrogens and other factors such as myometrial ...
Hill Martin - - 2007
This study addresses the question of whether changes in the biosynthesis and metabolism of neuroactive pregnanolone isomers (PIs) might participate in the timing of parturition in humans. The time profiles of unconjugated allopregnanolone (3alpha-hydroxy-5alpha-pregnan-20-one, P3alpha5alpha), pregnanolone (3alpha-hydroxy-5beta-pregnan-20-one, P3alpha5beta), isopregnanolone (3beta-hydroxy-5alpha-pregnan-20-one, P3beta5alpha) and epipregnanolone (3beta-hydroxy-5beta-pregnan-20-one, P3beta5beta), pregnenolone, their polar conjugates, progesterone, ...
Imwalle D B - - 2007
Intravaginal impedance (IVI) fluctuates during the goat estrous cycle. To understand which ovarian steroids are responsible for IVI changes and whether IVI variations are associated with precopulatory and copulatory behaviors, 8 ovariectomized females were assigned to 4 treatments in a 4 x 4 Latin square replicated over four 8-d periods. ...
Satterfield M Carey - - 2007
In species with noninvasive implantation by conceptus trophectoderm, fetal/maternal communications occur across the endometrial epithelia. The present studies identified changes in junctional complexes in the ovine endometrium that regulate paracellular trafficking of water, ions, and other molecules, and the secretory capacity of the uterine epithelia. Distinct temporal and spatial alterations ...
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