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https://www.readbyqxmd.com/read/27912078/mouse-double-minute-2-homolog-actively-suppresses-p53-activity-in-oocytes-during-mouse-folliculogenesis
#1
Chen-Xi Zhang, Qin Zhang, Yin-Yin Xie, Xue-Yan He, Cong Xiang, Xiao-Shuang Hou, Ying Zhou, Lai Chen, Guo-Xin Zhang, Geng Liu
The p53 signaling network is indispensible in cellular stress responses and tumor suppression. Negative regulations of p53 by mouse double minute 2 and 4 homologs (MDM2) and (MDM4) are an integrated component of the network and have been implicated in regulating the stress responses and the maintenance of normal development and homeostasis of multiple somatic cell lineages. However, the regulatory role of MDM2 on p53 and stress responses in female germ cells remains undetermined. Here, we used the Cre-loxP system to delete Mdm2 in oocytes at different stages of folliculogenesis in mice...
November 29, 2016: American Journal of Pathology
https://www.readbyqxmd.com/read/27890615/egr2-is-a-gonadotropin-induced-survival-factor-that-controls-the-expression-of-ier3-in-ovarian-granulosa-cells
#2
Hanyong Jin, Miae Won, Eunkyoung Shin, Hong-Man Kim, Kangseok Lee, Jeehyeon Bae
Pituitary gonadotropins are key hormones that orchestrate the growth and development of ovarian follicles. However, limited information is available on intra-ovarian factors that mediate the actions of gonadotropins. In this study, we identified that the early growth response 2 gene (EGR2) is a gonadotropin-inducible gene in granulosa cells of rats and humans. Analysis of consensus EGR-binding elements (EBEs) showed that the immediate early response 3 gene (IER3) is a novel transcriptional target gene of EGR2 as confirmed by the luciferase assay, electrophoretic mobility-shift assay (EMSA), chromatin immunoprecipitation (ChIP), and western blot analysis...
November 24, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27890351/unilaminar-follicular-cells-transiently-express-galectin-3-during-ovarian-folliculogenesis-in-pigs
#3
Seung-Dam Heo, Changnam Park, Jeongtae Kim, Meejung Ahn, Taekyun Shin
The localization of galectin-3, a β-galactoside-binding animal lectin, was immunohistochemically studied in the ovaries of pigs to determine its expression in ovarian folliculogenesis. Various stages of ovarian follicles were identified in the ovaries of adult pigs. Galectin-3 was immunostained in the squamous follicular cells surrounding oocytes in primordial follicles and in the unilaminar granulosa cells of primary follicles, but not in oocytes of multilaminar follicles (including primary, secondary, and tertiary Graafian follicles)...
November 17, 2016: Tissue & Cell
https://www.readbyqxmd.com/read/27879453/effects-of-supplementation-of-human-endometriotic-fluids-on-in-vitro-mouse-preantral-follicle-culture
#4
Seul Ki Kim, Byung Chul Jee, Seok Hyun Kim
This study aimed to investigate the potential detrimental effect of human endometriotic fluids (EFs) on in vitro growth of mouse preantral follicles. Preantral follicles (isolated from ovaries of 7- to 8-week-old mice) were cultured in growth medium for 10 days and then in maturation medium for 2 days. During in vitro culture, EF supernatants (0%, 2.5%, 5%, and 10%) were supplemented. Meiotic spindle integrity of metaphase II (MII) oocytes was analyzed. Hormone (17β-estradiol and anti-Müllerian hormone [AMH]) levels in the final spent media were measured by enzyme-linked immunosorbent assay...
November 21, 2016: Reproductive Sciences
https://www.readbyqxmd.com/read/27848973/progesterone-receptor-membrane-component-1-mediates-progesterone-induced-suppression-of-oocyte-meiotic-prophase-i-and-primordial-folliculogenesis
#5
Meng Guo, Cheng Zhang, Yan Wang, Lizhao Feng, Zhengpin Wang, Wanbo Niu, Xiaoyan Du, Wang Tang, Yuna Li, Chao Wang, Zhenwen Chen
Well-timed progression of primordial folliculogenesis is essential for mammalian female fertility. Progesterone (P4) inhibits primordial follicle formation under physiological conditions; however, P4 receptor that mediates this effect and its underlying mechanisms are unclear. In this study, we used an in vitro organ culture system to show that progesterone receptor membrane component 1 (PGRMC1) mediated P4-induced inhibition of oocyte meiotic prophase I and primordial follicle formation. We found that membrane-impermeable BSA-conjugated P4 inhibited primordial follicle formation similar to that by P4...
November 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27836978/a-homozygous-nobox-truncating-variant-causes-defective-transcriptional-activation-and-leads-to-primary-ovarian-insufficiency
#6
Lin Li, Binbin Wang, Wei Zhang, Beili Chen, Minna Luo, Jing Wang, Xi Wang, Yunxia Cao, Kehkooi Kee
STUDY QUESTION: Does a novel homozygous NOBOX truncating variant, identified in whole exome sequencing (WES) of patients with primary ovarian insufficiency (POI), cause defective transcriptional activation of multiple oocyte-related genes? SUMMARY ANSWER: A novel homozygous truncating mutation of NOBOX was confirmed to exhibit a loss-of-function effect using well-defined molecular and functional analyses. WHAT IS KNOWN ALREADY: Several NOBOX mutations have been reported to be associated with POI but all of them are heterozygous mutations...
November 11, 2016: Human Reproduction
https://www.readbyqxmd.com/read/27821469/removal-of-mouse-ovary-fat-pad-affects-sex-hormones-folliculogenesis-and-fertility
#7
Hong-Hui Wang, Qian Cui, Teng Zhang, Lei Guo, Ming-Zhe Dong, Yi Hou, Zhen-Bo Wang, Wei Shen, Jun-Yu Ma, Qing-Yuan Sun
As a fat storage organ, adipose tissue distributes widely all over the body and is important for energy supply, body temperature maintenance, organ protection, immune regulation and so on. In human, both underweight and overweight women are hard to become pregnant, which suggests that appropriate fat storage can guarantee the female reproductive capacity. In fact, a large mass of adipose tissue distributes around the reproductive system both in the male and female. However, the functions of ovary fat pad (the nearest adipose tissue to ovary) are not known...
November 7, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27815560/nitric-oxide-no-stimulates-steroidogenesis-and-folliculogenesis-in-fish
#8
Vinay Kumar Singh, Bechan Lal
The present study was undertaken to understand the physiological significance of the existence of nitric oxide synthase (NOS)/ nitric oxide (NO) system in fish ovary. For this, two doses of NO donor, sodium nitroprusside (SNP- 25µg and 50µg) and NOS inhibitor, N-nitro-L-arginine methyl ester (L-NAME - 50µg and 100µg)/100g body weight were administered during the two reproductive phases of reproductive cycle of the Clarias batrachus. During the late-quiescence phase, high dose of L-NAME decreased the NO, testosterone, 17β-estradiol, vitellogenin contents in serum and ovary, and activities of 5-ene-3β-hydroxysteroid dehydrogenases (3β-HSD) and 17β-hydroxysteroid dehydrogenases (17β-HSD) in ovary, while higher dose of SNP increased these parameters...
November 4, 2016: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27811472/fraction-of-auxemma-oncocalyx-and-oncocalyxone-a-affects-the-in-vitro-survival-and-development-of-caprine-preantral-follicles-enclosed-in-ovarian-cortical-tissue
#9
Johanna Leiva-Revilla, Laritza Ferreira Lima, Simone Vieira Castro, Claudio Cabral Campello, Valdevane Rocha Araújo, Juliana Jales de Hollanda Celestino, Otília Deusdênia Loiola Pessoa, Edilberto Rocha Silveira, Ana Paula Ribeiro Rodrigues, José Ricardo Figueiredo
BACKGROUND: Auxemma oncocalyx and its main component oncocalyxone A (onco A) have a high level of antioxidant and antitumor activity, but there are no studies on the action of both of these drugs regarding folliculogenesis. MATERIAL AND METHODS: Caprine ovarian tissue fragments were fixed (non-cultured control) or cultured for 1 or 7 days in α-MEM+ alone (cultured control) or supplemented with dimethyl sulfoxide (DMSO; 20% v/v), bone morphogenetic protein 15 (BMP-15; 100 ng/ml), doxorubicin (DXR; 0...
2016: Forschende Komplementärmedizin, Research in Complementary Medicine
https://www.readbyqxmd.com/read/27799626/regulation-and-roles-of-the-hyaluronan-system-in-mammalian-reproduction
#10
Ali A Fouladi-Nashta, Kabir Ayobami Raheem, Waleed F Marei, Fataneh Ghafari, Geraldine Hartshorne
Hyaluronan (HA) is a non-sulfated gylcosaminglycan polymer naturally occurring in many tissues and fluids of mammals, including the reproductive system. Its biosynthesis by HA synthase (HAS1-3) and catabolism by hyaluronidases (HYALs) are affected by ovarian steroid hormones. Depending upon its molecular size, HA functions both as a structural component of tissues in the form of high molecular weight HA, or as a signalling molecule in the form of small HA molecules or HA fragments with effects mediated through interaction with its specific cell membrane receptors...
October 31, 2016: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27799458/microrna-145-negatively-regulates-cell-proliferation-through-targeting-irs1-in-isolated-ovarian-granulosa-cells-from-patients-with-polycystic-ovary-syndrome
#11
Guoqing Cai, Xiangdong Ma, Biliang Chen, Yanhong Huang, Shujuan Liu, Hong Yang, Wei Zou
Polycystic ovary syndrome (PCOS) is a complex, heterogeneous endocrine and metabolic disorder affecting 5% to 10% of reproductive-age women. A high rate of granulosa cell (GC) proliferation contributes to the abnormal folliculogenesis in patients with PCOS. Evidence has proved that dysregulation of microRNAs is involved in the pathogenesis of PCOS. In this study, we investigated the effect of miR-145 on cell proliferation and the underlying mechanism of miR-145 in isolated human GCs from the aspirated follicular fluid in women with PCOS...
October 30, 2016: Reproductive Sciences
https://www.readbyqxmd.com/read/27798098/impaired-protein-stability-and-nuclear-localization-of-nobox-variants-associated-with-premature-ovarian-insufficiency
#12
Ilaria Ferrari, Justine Bouilly, Isabelle Beau, Fabiana Guizzardi, Alberto Ferlin, Marzia Pollazzon, Mariacarolina Salerno, Nadine Binart, Luca Persani, Raffaella Rossetti
Premature Ovarian Insufficiency (POI) is a clinical syndrome defined by a loss of ovarian activity before the age of 40. Its pathogenesis is still largely unknown, but increasing evidences support a genetic basis in most cases. Among these, heterozygous mutations in NOBOX, a homeobox gene encoding a transcription factor expressed specifically by oocyte and granulosa cells within the ovary, have been reported in ~ 6 % of women with sporadic POI. The pivotal role of NOBOX in early folliculogenesis is supported by findings in knock-out mice...
October 23, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/27797914/oocyte-somatic-cell-interactions-in-the-human-ovary-novel-role-of-bone-morphogenetic-proteins-and-growth-differentiation-factors
#13
REVIEW
Hsun-Ming Chang, Jie Qiao, Peter C K Leung
BACKGROUND: Initially identified for their capability to induce heterotopic bone formation, bone morphogenetic proteins (BMPs) are multifunctional growth factors that belong to the transforming growth factor β superfamily. Using cellular and molecular genetic approaches, recent studies have implicated intra-ovarian BMPs as potent regulators of ovarian follicular function. The bi-directional communication of oocytes and the surrounding somatic cells is mandatory for normal follicle development and oocyte maturation...
October 26, 2016: Human Reproduction Update
https://www.readbyqxmd.com/read/27795706/inositol-treatment-and-art-outcomes-in-women-with-pcos
#14
REVIEW
Deepika Garg, Reshef Tal
Polycystic ovary syndrome (PCOS) affects 5-10% of women in reproductive age and is characterized by oligo/amenorrhea, androgen excess, insulin resistance, and typical polycystic ovarian morphology. It is the most common cause of infertility secondary to ovulatory dysfunction. The underlying etiology is still unknown but is believed to be multifactorial. Insulin-sensitizing compounds such as inositol, a B-complex vitamin, and its stereoisomers (myo-inositol and D-chiro-inositol) have been studied as an effective treatment of PCOS...
2016: International Journal of Endocrinology
https://www.readbyqxmd.com/read/27769286/relationship-between-advanced-glycation-end-products-and-steroidogenesis-in-pcos
#15
Deepika Garg, Zaher Merhi
BACKGROUND: Women with PCOS have elevated levels of the harmful Advanced Glycation End Products (AGEs), which are highly reactive molecules formed after glycation of lipids and proteins. Additionally, AGEs accumulate in the ovaries of women with PCOS potentially contributing to the well-documented abnormal steroidogenesis and folliculogenesis. MAIN BODY: A systematic review of articles and abstracts available in PubMed was conducted and presented in a systemic manner...
October 21, 2016: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/27765047/used-protocols-for-isolation-and-propagation-of-ovarian-stem-cells-different-cells-with-different-traits
#16
Hossein Yazdekhasti, Zahra Rajabi, Soraya Parvari, Mehdi Abbasi
Although existence of ovarian stem cells (OSCs) in mammalian postnatal ovary is still under controversy, however, it has been almost accepted that OSCs are contributing actively to folliculogenesis and neo-oogenesis. Recently, various methods with different efficacies have been employed for OSCs isolation from ovarian tissue, which these methods could be chosen depends on aim of isolation and accessible equipments and materials in lab. Although isolated OSCs from different methods have various traits and characterizations, which might become from their different nature and origin, however these stem cells are promising source for woman infertility treatment or source of energy for women with a history of repeat IVF failure in near future...
October 20, 2016: Journal of Ovarian Research
https://www.readbyqxmd.com/read/27763207/potential-use-of-anti-apoptotic-proteins-and-non-coding-rnas-in-in-vitro-follicular-growth-and-ovarian-tissue-engineering
#17
Yoon Kim, Amin Tamadon, Seung-Yup Ku
In vitro culture of ovarian follicles is a promising bioengineering technique for preserving fecundity in reproductive age female by providing fertilizable oocytes. Successful clinical application should be preceded by developing the protocols that can efficiently overcome follicular cell apoptosis since the apoptosis is a critical phenomenon in in vivo folliculogenesis and in in vitro follicular maturation. Numerous pro-survival and anti-apoptotic molecules including follicular developmental regulators have been reported to be involved in the intra-ovarian apoptosis...
October 20, 2016: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27760586/effects-of-angiogenin-on-granulosa-and-theca-cell-function-in-cattle
#18
J L Dentis, N B Schreiber, A M Burress, L J Spicer
Angiogenin is a member of the ribonuclease A superfamily of proteins that has been implicated in stimulating angiogenesis but whether angiogenin can directly affect ovarian granulosa or theca cell function is unknown. Therefore, the objective of these studies was to determine the effect of angiogenin on proliferation and steroidogenesis of bovine granulosa and theca cells. In experiments 1 and 2, granulosa cells from small (1 to 5 mm diameter) follicles and theca cells from large (8 to 22 mm diameter) follicles were cultured to evaluate the dose-response effect of recombinant human angiogenin on steroidogenesis...
October 20, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27746005/dietary-supplementation-of-yucca-yucca-schidigera-affects-ovine-ovarian-functions
#19
Radoslava Vlčková, Drahomíra Sopková, Zuzana Andrejčáková, Igor Valocký, Attila Kádasi, Abdel Halim Harrath, Vladimír Petrilla, Alexander V Sirotkin
Yucca (Yucca schidigera) is a popular medicinal plant due to its many positive effects on animal and human physiology, including their reproductive systems. To examine the effect of supplemental yucca feeding on sheep reproduction, including ovarian functions and their hormonal regulators, ewes were fed (or not fed, control) yucca powder (1.5 g/head/day, 30 days). Macromorphometric indexes of the oviduct, ovary, and ovarian folliculogenesis were measured. Reproductive hormone levels in the blood were measured using a radioimmunoassay...
January 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/27734842/growth-arrest-specific-2-gas2-is-a-critical-mediator-of-germ-cell-cyst-breakdown-and-folliculogenesis-in-mice
#20
J Philippe York, Yi Athena Ren, Jie Zeng, Bin Zhang, Fang Wang, Rui Chen, Jianqiao Liu, Xuefeng Xia, Pumin Zhang
In the mouse ovary, the primordial follicle pool is established through a diverse array of signaling pathways and tissue remodeling events. Growth arrest specific gene two (GAS2) is a highly conserved cytoskeleton-associated protein whose in vivo function remains unclear. In Drosophila, loss of the GAS2 homolog, Pigs, results in infertility. We demonstrate herein that, in the mouse ovary, GAS2 is expressed in the stromal cells surrounding the oocyte cysts on 16.5 dpc, and in stromal cells surrounding growing follicles during juvenile and adult life...
October 13, 2016: Scientific Reports
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