Search Results
Results 201 - 250 of 1906
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Hasegawa Junichi - - 2007
The purpose of this study was to predict developmental competence of human oocytes during ICSI via analysis of connexin 43 (Cx43) in cumulus cells surrounding mature oocytes. Human cumulus cells were manually separated from the oocyte-cumulus complex under a microscope. Cx43 mRNA was expressed by real-time quantitative polymerase chain reaction ...
Ikuta Kyosuke - - 2007
The adult female of the freshwater ostracod Cyprinotus uenoi Brehm, 1936 (Podocopida: Cypridoidea) has a pair of long, sac-like ovaries separately lying in the posterior part of the left and the right carapace valves. Oogonia and very early previtellogenic oocytes are located in the terminal germarium of each ovary. In ...
Matsuda-Minehata Fuko - - 2007
In mammalian ovaries, more than 99% of follicles undergo atresia during growth and development. Recently, we found that the expression of cellular FLICE-like inhibitory protein long form (cFLIP(L)) decreased during follicular atresia in granulosa cells of porcine ovaries. In humans and other species, both the short (cFLIP(S)) and long (cFLIP(L)) ...
Poulton John S JS Department of Biological Science, Florida State University, Tallahassee, FL 32306-4370, - - 2007
Intercellular communication between the somatic and germline cells is vital to development of the Drosophila egg chamber. One critical outcome of this communication is the polarization of the oocyte along the anterior-posterior axis, a process induced by an unknown signal from the somatic follicle cells to the oocyte. The existence ...
Miranda-Jiménez Leonor - - 2007
Ovarian follicles luteinize after ovulation, requiring structural and molecular remodeling along with exponential increases in steroidogenesis. Cholesterol substrates for luteal steroidogenesis are imported via scavenger receptor-BI (SR-BI) and the low-density lipoprotein (LDL) receptor from circulating high-density lipoproteins and LDL. SR-BI mRNA is expressed in pig ovaries at all stages of ...
Villecco E I - - 2007
In this work we carried out ultrastructural, autoradiographic and biochemical analyses of the follicular epithelium during C. cranwelli previtellogenesis. This study revealed that the follicular epithelium in early previtellogenesis is constituted of a single layer of squamous homogeneous cells. During mid-previtellogenesis two types of cells develop: dark cells and clear ...
Yin Jie - - 2007
To investigate the expression of mRNA of leptin long-form receptor (OB-Rb) in luteinized granulosa cells of obese women with polycystic ovary syndrome (PCOS), and to determine the role of leptin in the physiopathology of PCOS, luteinized granulosa cells were collected from the follicle fluid of 10 obese women who met ...
Saint-Dizier Marie - - 2007
In order to better understand the pituitary regulation of follicular growth in the domestic cat, follicle stimulating hormone (FSH) and luteinizing hormone (LH) receptors (R) were localized and quantified in relation to follicle diameter and atresia using in situ ligand binding on ovarian sections. Expression of FSHR was homogeneous and ...
Isobe Naoki - - 2007
The aim of the present study was to examine the frequencies of cell proliferation and death of granulosa and theca interna layers during development of cystic follicles in order to understand the mechanisms of cystic follicle formation. Paraffin sections of cystic follicles were immunostained with antibodies against proliferating cell nuclear ...
Salih Sana M - - 2008
OBJECTIVE: To investigate the regulation of catechol O-methyltransferase (COMT) expression in granulosa cells and assess potential effects of 2-methoxyestradiol (2-ME2) and COMT inhibitors on granulosa cell steroidogenesis and proliferation. DESIGN AND SETTING: Controlled experimental study in an academic research laboratory. INTERVENTION(S): JC410 porcine and HGL5 human granulosa cell lines were ...
Nixon B - - 2007
At the moment of insemination millions of mammalian sperm cells are released into the female reproductive tract in order to find a single cell - the oocyte. The spermatozoa subsequently ignore the thousands of cells they make contact with during their journey to the site of fertilisation, until they reach ...
Hauser Anja E - - 2007
Affinity maturation of antibodies during the course of an adaptive immune response requires germinal centre (GC) formation within B-cell follicles. Much of the current understanding of GC function has been derived from histology, but these static views have left unresolved many questions about cell movement in GCs. In this Progress ...
Jeschke Udo - - 2007
BACKGROUND: The immunosuppressive protein glycodelin A (GdA) is secreted by a large number of gynaecological tumors. GdA has a unique glycosylation, including fucosylated LacdiNAc structures. Trophoblast tumor cells produce a variety of steroid hormones and human chorionic gonadotropin (hCG). The purpose of this study was to investigate the effect of ...
Buratini J J - - 2007
Some fibroblast growth factors (FGFs) affect ovarian follicle cell growth and/or differentiation. Whereas many FGFs activate several FGF receptors, FGF7 and FGF10 primarily activate only one, FGFR2B. As FGF7 is produced by bovine theca cells and acts on granulosa cells, we tested the hypothesis that FGF10 may also play a ...
Teague Brittany N - - 2007
As the immediate precursors to mature follicular B cells in splenic development, immature transitional cells are an essential component for understanding late B cell differentiation. It has been shown that T2 cells can give rise to mature B cells; however, whether T3 B cells represent a normal stage of B ...
He Pei-Jian - - 2007
The circadian clock, regulating hormonal secretion and metabolisms in accordance with the environmental light-dark cycle, resides in almost all peripheral tissues as well as in the superchiasmatic nucleus. Clock gene expression has been found to be noncyclic during spermatogenesis and the differentiation of thymocytes. However, currently little is known about ...
Hutt Karla J - - 2007
The mammalian oocyte undertakes a highly complex journey to maturity during which it successively acquires a series of characteristics necessary for fertilization and the development of a healthy embryo. While the contribution of granulosa cells to oocyte development has been studied for many years, it has recently become apparent that ...
Lodde Valentina - - 2007
In mammals, oocyte acquires a series of competencies sequentially during folliculogenesis that play critical roles at fertilization and early stages of embryonic development. In mouse, chromatin in germinal vesicle (GV) undergoes dynamic changes during oocyte growth and its progressive condensation has been related to the achievement of developmental potential. Cumulus ...
Sunak Neera - - 2007
This study investigated cortisol inactivation by 11beta-hydroxysteroid dehydrogenase (11beta HSD) enzymes in porcine granulosa cells from antral follicles at different developmental stages and in ovarian cysts. In granulosa cells, cortisol oxidation increased threefold with antral follicle diameter (P < 0.001). This trend was paralleled by a threefold increase in NADP(+)-dependent ...
Cepni Ismail - - 2008
OBJECTIVE: To localize gap junction protein connexin 37 (Cx37) in granulosa cells obtained from aspiration of follicles, and to compare differences between poor responder and nonpoor responder patients in assisted reproductive technology. DESIGN: Prospective clinical study. SETTING: IVF unit of a university hospital. PATIENT(S): Seventy patients with various causes of ...
Qing Tingting - - 2007
In vitro derivation of oocytes from embryonic stem (ES) cells has the potential to be an important tool for studying oogenesis as well as advancing the field of therapeutic cloning by providing an alternative source of oocytes. Here, we demonstrate a novel, two-step method for inducing mouse ES cells to ...
Thurston L M - - 2007
Cortisol-cortisone metabolism is catalysed by the bi-directional NADP(H)-dependent type 1 11beta-hydroxysteroid dehydrogenase (11betaHSD1) enzyme and the oxidative NAD(+)-dependent type 2 11betaHSD (11betaHSD2). This study related the expression of 11betaHSD1 and 11betaHSD2 enzymes (mRNA and protein) to net 11-ketosteroid reductase and 11beta-dehydrogenase (11beta-DH) activities in bovine follicular granulosa and luteal cells. ...
Chien Eileen Jea - - 2007
Progesterone is an endogenous immunomodulator and can suppress T-cell activation during pregnancy. We have previously shown that the non-genomic effects of progesterone, especially acidification, are exerted via plasma membrane sites and suppress cellular genomic responses to mitogens. This study aimed to show that acidification is due to a non-genomic inhibition ...
Tosca Lucie - - 2008
IGF-1 plays a key role in the proliferation and differentiation of granulosa cells. However, the molecular mechanism of IGF-1 action in avian granulosa cells during follicle maturation is unclear. Here, we first studied IGF-1 receptor (IGF-1R) expression, IGF-1-induced progesterone production and some IGF-1R signaling pathways in granulosa cells from different ...
Spicer L J - - 2007
Little is known regarding the role of insulin-like growth factor 2 (IGF2) and the regulation of the IGF2 receptor (IGF2R) during follicular development. Granulosa cells were collected from small (1-5 mm) and large (8-22 mm) bovine follicles and were treated with IGF2 for 1-2 days in serum-free medium, and steroid ...
Johnson A L - - 2007
Tumor necrosis factor-related apoptosis inducing ligand (TRAIL) represents one of several cytokine members of the tumor necrosis factor superfamily reported to initiate apoptosis in a wide range of transformed, but not most normal, cell types. The present studies were conducted to evaluate the potential for TRAIL to promote apoptotic cell ...
Murtha Amy P - - 2007
OBJECTIVE: The purpose of this study was to determine whether progesterone exerts a protective effect in chorion and decidua cells when exposed to calcimycin. STUDY DESIGN: Fetal membrane samples were collected from term elective repeat cesarean deliveries and chorion and decidua cells that are separated and cultured. Cells were pretreated ...
Mita Masatoshi - - 2007
Previously, the gonad-stimulating substance (GSS) which acts as the gonadotropin was purified from the starfish (Asterina pectinifera) and subsequently, its structure was deciphered. In this study, artificial GSS was synthesized and its interaction with the receptors was examined further. According to competitive experiments using radioiodinated and radioinert GSS in various ...
Fru K N - - 2007
BACKGROUND: This study seeks to clarify cell cycle dynamics of granulosa cells following hCG and elucidate the expression of epidermal growth factor (EGF)-like ligands during luteinization. METHODS: Granulosa cells were obtained from rhesus macaques undergoing controlled ovarian stimulation protocols before or after an ovulatory hCG bolus. Cell cycle characteristics were ...
Ellenberger C - - 2007
Benign (n=33) and malignant metastasizing (n=1) granulosa cell tumours (GCTs) from 34 mares aged 3-21 years, and normal (control) ovaries from nine mares aged 3-10 years, were examined histologically and immunohistochemically (for inhibin alpha, glutathione S-transferase alpha [GSTalpha], c-erbB-2 oncoprotein [cerb], cytokeratin, vimentin, desmin and alpha-actin), the results being related ...
Foreman Darhl - - 2007
The changes in inhibin immunostaining in the gonads during the annual reproductive cycle of both sexes of the prairie dog are described. No inhibin immunostaining was found in primary or secondary follicles of the ovary. Theca and granulosa cells of preovulatory Graafian follicles found in January and February stained for ...
Garcia-Rudaz Cecilia - - 2007
In rodents, the formation of ovarian follicles occurs after birth. In recent years, several factors required for follicular assembly and the growth of the newly formed follicles have been identified. We now describe a novel gene, Fxna, identified by differential display in the neonatal rat ovary. Fxna encodes an mRNA ...
Ogorzałek Antoni - - 2007
Follicular cells in Coreus marginatus are diversified into two main subpopulations of different cell morphology, ultrastructure, distribution of F-actin and ionic communication between oocyte and follicular cells. Cells forming the insert between the operculum and the bottom of the egg envelope and, subsequently, a circle of micropylar processes were retarded ...
Russell Darryl L - - 2007
Successful ovulation requires that developmentally competent oocytes are released with appropriate timing from the ovarian follicle. Somatic cells of the follicle sense the ovulatory stimulus and guide resumption of meiosis and release of the oocyte, as well as structural remodelling and luteinization of the follicle. Complex intercellular communication co-ordinates critical ...
Sherbet Daniel P - - 2007
The hydroxysteroid dehydrogenases (HSDs) interconvert pairs of weak and potent steroids, thus serving as key enzymes in the regulation of intracellular hormone potency. These enzymes may appear to drive unidirectional steroid flux in intact cells but actually catalyze bi-directional metabolism that achieve pseudo-equilibria with strong directional preferences. Even small shifts ...
Kothlow Sonja - - 2007
The chicken represents the best-characterized animal model for B cell development in the so-called gut-associated lymphoid tissue (GALT) and the molecular processes leading to B cell receptor diversification in this species are well investigated. However, the mechanisms regulating B cell development and homeostasis in GALT species are largely unknown. Here ...
Jancar Nina - - 2007
The aim was to establish the impact of human granulosa cell apoptosis and reactive oxygen species (ROS) production on fertilization competence of the oocyte, embryo developmental stage and implantation rate. Thirty women undergoing IVF-ET for tubal factor infertility were included; GnRH antagonists and gonadotrophins were used for ovarian stimulation. Granulosa ...
Diamanti-Kandarakis Evanthia - - 2007
The aim of the present study was to investigate the localization/immunohistochemical distribution of AGEs and RAGE, as well as their putative signalling mediator NF-kappaB in ovaries of women with polycystic ovary syndrome (PCOS) compared to normal. Archival ovarian-tissue samples from biopsies of six women with PCOS and from six healthy ...
Galas Jerzy - - 2007
Immunolocalisation of androgen receptor (AR) and steroid contents were analyzed in the ovaries of 7- and 14-day-old bank voles, reared in a long (LD) and short (SD) photoperiod. The strongest AR immunoreaction was found in the stromal cells, especially in the ovaries of 7-day-old animals, and in the granulosa cells ...
Nandedkar Tarala - - 2007
In the mammalian ovary, early follicular development is gonadotropin independent. Interaction between the oocyte and granulosa cells possibly plays an important role in transition of primordial to preantral stage. However, the molecular and cellular control of early follicular development and cell-cell interaction is complex and poorly understood. In the present ...
Pregel Paola - - 2007
Granulosa cell tumours are observed with increased frequency among calves slaughtered in Northern Italy. The use of illegal anabolics in breeding was taken into account as a cause of this pathology. An in vitro approach was used to detect the possible alterations of cell proliferation induced by anabolics on primary ...
Niswender G D - - 2007
Experiments were conducted to further our understanding of the cellular and molecular mechanisms that regulate luteal function in ewes. Inhibition of protein kinase A (PKA) reduced (P < 0.05) secretion of progesterone from both small and large steroidogenic luteal cells. In addition, the relative phosphorylation state of steriodogenic acute regulatory ...
Liu Yi-Xun - - 2007
Follicular development and differentiation are sequential events which are tightly regulated by endocrine hormones, intraovarian regulators and cell-cell interactions. Balanced cell proliferation and apoptosis play an important role in the selection of dominant follicle. The formation of primordial follicle is initiated after a migratory primordial germ cell establishes a transitory ...
Stouffer Richard L - - 2007
In recent years, significant progress was made, particularly through the use of the macaque monkey, in identifying three types of local factors that are induced by the midcycle LH surge and play a critical role in ovulation and/or luteinization of the primate follicle. The ovulatory gonadotropin surge increases prostaglandin (PTG, ...
McGraw Serge - - 2007
BACKGROUND: Various histone acetylases (HATs) play a critical role in the regulation of gene expression, but the precise functions of many of those HATs are still unknown. Here we provide evidence that MYST4, a known HAT, may be involved in early mammalian gametogenesis. RESULTS: Although MYST4 mRNA transcripts are ubiquitous, ...
Lu Yunzhe - - 2007
Germ-line mutations in BRCA1 predispose women to early-onset, familial breast and ovarian cancers. However, BRCA1 expression is not restricted to breast and ovarian epithelial cells. For example, ovarian BRCA1 expression is enriched in ovarian granulosa cells, which are responsible for ovarian estrogen production in premenopausal women. Furthermore, recent tissue culture ...
Hułas-Stasiak Monika - - 2007
This study was designed to determine the expression pattern of estrogen receptor (ER) subtypes in the Acomys cahirinus ovarian cells during its postnatal development. Immunohistochemical studies revealed the presence of ERalpha and ERbeta in germinal epithelium cells and interstitial tissue. Both these ER subtypes were also seen in granulosa cells ...
Voronina Ekaterina E Brown University, Department of Molecular and Cell Biology and Biochemistry, 69 Brown St., Box G-J115, Providence, RI 02912, - - 2007
Oocyte development in the mammalian ovary requires productive interactions with somatic granulosa cells of the ovarian follicle. Proliferating granulosa cells support the progression of follicular growth and maturation, multiplying dramatically as it unfolds. The cell cycle recruitment of granulosa cells is regulated at least in part by hormones such as ...
Muenthaisong S - - 2007
We investigated the potential of vitrified-warmed buffalo oocytes to develop to blastocysts after parthenogenetic activation (PA) and somatic cell nuclear transfer (SCNT). In vitro-matured oocytes before and after enucleation (M-II oocytes and enucleated oocytes, respectively) were put in 7.5% DMSO and 7.5% ethylene glycol (EG) for 4, 7 and 10 ...
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