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folliculogenesis

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https://www.readbyqxmd.com/read/29770509/molecular-characteristics-of-granulosa-and-cumulus-cells-and-oocyte-competence-in-nelore-cows-with-low-and-high-numbers-of-antral-follicles
#1
C O Rosa, Lsr Marinho, Pra da Rosa, M P De Cesaro, P A Lunardelli, K C Silva-Santos, A C Basso, V Bordignon, M M Seneda
The aims of this study were to investigate whether the number of antral follicles (AF) in the ovaries of Nelore cows is influenced with the developmental competence of oocytes to reach the blastocyst stage and to quantify the mRNA abundance of genes associated with folliculogenesis and oogenesis in granulosa and cumulus cells. A total of 168 cows were distributed into two experimental groups according to the number of AF, low (≤31) and high AF (≥92), which were determined based on the mean number of AF (61...
May 16, 2018: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29748175/long-term-exposure-to-very-low-doses-of-bisphenol-s-affects-female-reproduction
#2
Jan Nevoral, Yaroslav Kolinko, Jiri Moravec, Tereza Zalmanova, Kristyna Hoskova, Sarka Prokesova, Pavel Klein, Kamar Ghaibour, Petr Hosek, Miriam Stiavnicka, Hedvika Rimnacova, Zbynek Tonar, Jaroslav Petr, Milena Kralickova
Bisphenols belong to the endocrine disruptors, affecting reproduction even in extremely low doses. Bisphenol S (BPS) has become widely used as a substitute for the earlier-used BPA; however, its harmnessless is questionable. The aim of this study was to evaluate the effect of BPS on folliculogenesis and oocyte quality after in vivo exposure to low doses of BPS. 4-week-old ICR females (N = 16 in each experimental group) were exposed to vehicle control (VC), BPS1 (0.001 ng BPS . g bw-1 . day-1), BPS2 (0.1 ng ...
May 10, 2018: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29747587/functional-signaling-and-gene-regulatory-networks-between-the-oocyte-and-the-surrounding-cumulus-cells
#3
Fernando H Biase, Katelyn M Kimble
BACKGROUND: The maturation and successful acquisition of developmental competence by an oocyte, the female gamete, during folliculogenesis is highly dependent on molecular interactions with somatic cells. Most of the cellular interactions identified, thus far, are modulated by growth factors, ions or metabolites. We hypothesized that this interaction is also modulated at the transcriptional level, which leads to the formation of gene regulatory networks between the oocyte and cumulus cells...
May 10, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29707687/nonmonotonic-effects-of-chronic-low-dose-di-2-ethylhexyl-phthalate-on-gonadal-weight-and-reproductive
#4
Sunyeong Cha, Kayeon Jung, Min Young Lee, Yeon Jeong Hwang, Eunhyeok Yang, Sung-Ho Lee, Hyo-Il Jung, Yong-Pil Cheon
Endocrine disruptors have been concerned in toxicology but now challenged as physiological point especially concerned with exposing dose and period. In this study the low-dose chronic administration of di(2-ethylhexyl) phthaltae (DEHP) during reproductive period was examined to evaluate the possible roles. Adult male and female CD-1 mice were exposed to DEHP with drinking water containing 133 1g/L and 1,330 /g/L DEHP in water according to OECD 433 guide line and sacrificed just after weaning. The weights of uterus and ovary were decreased by drinking of 1,330 /g/L DEHP water...
March 2018: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/29706932/potential-functions-of-igfbp-2-for-ovarian-folliculogenesis-and-steroidogenesis
#5
REVIEW
Marion Spitschak, Andreas Hoeflich
Ovarian follicles, as transient structural and functional complexes with the oocyte and the associated cells, determine the female reproductive cycle and thus fertility. Ovarian function is subject to the strict control of hormones and growth factors and thus regulated by auto-, para-, and endocrine mechanisms but influenced also by endogenous factors. During the waves of follicular growth and development, one follicle (monoovulatory) or a limited number of them (polyovulatory) are selected under hypothalamic-gonadal control for maturation until ovulation, resulting in the fertile oocyte...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29692799/genome-wide-association-analyses-highlight-the-potential-for-different-genetic-mechanisms-for-litter-size-among-sheep-breeds
#6
Song-Song Xu, Lei Gao, Xing-Long Xie, Yan-Ling Ren, Zhi-Qiang Shen, Feng Wang, Min Shen, Emma Eyϸórsdóttir, Jón H Hallsson, Tatyana Kiseleva, Juha Kantanen, Meng-Hua Li
Reproduction is an important trait in sheep breeding as well as in other livestock. However, despite its importance the genetic mechanisms of litter size in domestic sheep ( Ovis aries ) are still poorly understood. To explore genetic mechanisms underlying the variation in litter size, we conducted multiple independent genome-wide association studies in five sheep breeds of high prolificacy (Wadi, Hu, Icelandic, Finnsheep, and Romanov) and one low prolificacy (Texel) using the Ovine Infinium HD BeadChip, respectively...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29691711/biomechanics-and-mechanical-signaling-in-the-ovary-a-systematic-review
#7
REVIEW
Jaimin S Shah, Reem Sabouni, Kamaria C Cayton Vaught, Carter M Owen, David F Albertini, James H Segars
PURPOSE: Mammalian oogenesis and folliculogenesis share a dynamic connection that is critical for gamete development. For maintenance of quiescence or follicular activation, follicles must respond to soluble signals (growth factors and hormones) and physical stresses, including mechanical forces and osmotic shifts. Likewise, mechanical processes are involved in cortical tension and cell polarity in oocytes. Our objective was to examine the contribution and influence of biomechanical signaling in female mammalian gametogenesis...
April 24, 2018: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/29679326/synthetic-peg-hydrogel-for-engineering-the-environment-of-ovarian-follicles
#8
Uziel Mendez, Hong Zhou, Ariella Shikanov
The functional unit within the ovary is the ovarian follicle, which is also a morphological unit composed of three basic cell types: the oocyte, granulosa, and theca cells. Similar to human ovarian follicles, mouse follicles can be isolated from their ovarian environment and cultured in vitro to study folliculogenesis, or follicle development for days or weeks. Over the course of the last decade, follicle culture in a three-dimensional (3D) environment exponentially improved the outcomes of in vitro folliculogenesis...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29679322/three-dimensional-hydrogel-based-culture-to-study-the-effects-of-toxicants-on-ovarian-follicles
#9
Hong Zhou, Ariella Shikanov
Various toxicants, such as drugs and their metabolites, can cause potential ovarian toxicity. As the functional units of the ovary, ovarian follicles are susceptible to this type of damage at all developmental stages. Studying the effects of toxicants on ovarian follicles is an important task. Three-dimensional (3D) hydrogels, such as fibrin alginate interpenetrating networks (FA-IPNs), can support ovarian follicle culture in vitro for extended periods of time and serve as a suitable tool for studying ovotoxicity...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29670898/effects-of-withania-somnifera-on-reproductive-system-a-systematic-review-of-the-available-evidence
#10
REVIEW
Ramin Nasimi Doost Azgomi, Afshar Zomorrodi, Hossein Nazemyieh, Seyed Mohammad Bagher Fazljou, Homayoun Sadeghi Bazargani, Fatemeh Nejatbakhsh, Arezoo Moini Jazani, Yadollah Ahmadi AsrBadr
Introduction: Withania somnifera (WS) also known as ashwagandha is a well-known medicinal plant used in traditional medicine in many countries for infertility treatment. The present study was aimed at systemically reviewing therapeutic effects of WS on the reproductive system. Methods: This systematic review study was designed in 2016. Required data were obtained from PubMed, Scopus, Google Scholar, Cochrane Library, Science Direct, Web of Knowledge, Web of Science, and manual search of articles, grey literature, reference checking, and expert contact...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29670080/starvation-during-pregnancy-impairs-fetal-oogenesis-and-folliculogenesis-in-offspring-in-the-mouse
#11
Jun-Jie Wang, Xiao-Wei Yu, Rui-Ying Wu, Xiao-Feng Sun, Shun-Feng Cheng, Wei Ge, Jing-Cai Liu, Ya-Peng Li, Jing Liu, Shu-Hua Zou, Massimo De Felici, Wei Shen
Although it is becoming increasingly evident that maternal starvation during pregnancy can have permanent effects on a range of physiological processes in the offspring, scant information is available about the consequence of such condition for oogenesis and hence for lifetime reproductive success of progeny in mammals. In the present study, we address this topic by starving pregnant mice at the time of ovarian differentiation (12.5 days post coitum (dpc)) for three consecutive days and analyzed the consequence first on the survival of the fetal oocytes and their capability to progress throughout the stages of meiotic prophase I (MPI) and then on the postnatal folliculogenesis of the offspring...
April 18, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29668981/wnts-role-in-bovine-folliculogenesis-and-estrogen-production
#12
B I Gomez, B H Aloqaily, C A Gifford, D M Hallford, J A Hernandez Gifford
Appreciation of mechanisms that affect steroidogenesis is critical to identifying compromising signals that may decrease reproductive efficiency. Follicle maturation and steroidogenesis requires coordinated actions from the pituitary gonadotropins, and local ovarian signaling molecules. Beta-catenin (CTNNB1), the lynchpin molecule of canonical wingless-type mouse mammary tumor virus integration site (WNT) signaling is required for maximal gonadotropin stimulation of steroid production from granulosa (GC) and luteal cells...
April 13, 2018: Journal of Animal Science
https://www.readbyqxmd.com/read/29644074/acquisition-of-pluripotency-in-the-chick-embryo-occurs-during-intrauterine-embryonic-development-via-a-unique-transcriptional-network
#13
Jae Yong Han, Hyo Gun Lee, Young Hyun Park, Young Sun Hwang, Sang Kyung Kim, Deivendran Rengaraj, Byung Wook Cho, Jeong Mook Lim
Background: Acquisition of pluripotency by transcriptional regulatory factors is an initial developmental event that is required for regulation of cell fate and lineage specification during early embryonic development. The evolutionarily conserved core transcriptional factors regulating the pluripotency network in fishes, amphibians, and mammals have been elucidated. There are also species-specific maternally inherited transcriptional factors and their intricate transcriptional networks important in the acquisition of pluripotency...
2018: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/29643837/insulin-like-growth-factor-binding-proteins-and-igfbp-proteases-a-dynamic-system-regulating-the-ovarian-folliculogenesis
#14
REVIEW
Sabine Mazerbourg, Philippe Monget
The aim of the present article is to update our understanding of the expression of the insulin-like growth factor binding proteins (IGFBPs), IGFBP proteases and their implication in the different processes of ovarian folliculogenesis in mammals. In the studied species, IGFs and several small-molecular weight IGFBPs (in particular IGFBP-2 and IGFBP-4) are considered, respectively, as stimulators and inhibitors of follicular growth and maturation. IGFs play a key role in sensitizing ovarian granulosa cells to FSH action during terminal follicular growth...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29622662/potential-genetic-polymorphisms-predicting-polycystic-ovary-syndrome
#15
Yao Chen, Shu-Ying Fang
Polycystic ovary syndrome (PCOS) is a heterogenous endocrine disorder with typical symptoms of oligomenorrhoea, hyperandrogenism, hirsutism, obesity, insulin resistance and increased risk of type 2 diabetes mellitus. Extensive evidence indicates that PCOS is a genetic disease and numerous biochemical pathways have been linked with its pathogenesis. A number of genes from these pathways have been investigated, which include those involved with steroid hormone biosynthesis and metabolism, action of gonadotropin and gonadal hormones, folliculogenesis, obesity and energy regulation, insulin secretion and action and many others...
April 5, 2018: Endocrine Connections
https://www.readbyqxmd.com/read/29619874/regulatory-roles-of-ephrina5-and-its-novel-signaling-pathway-in-mouse-primary-granulosa-cell-apoptosis-and-proliferation
#16
Tesfaye Worku, Kai Wang, Duncan Ayers, Di Wu, Zia Ur Rehman, Hao Zhou, Liguo Yang
Recent findings suggest that ephrinA5 (Efna5) has a novel role in female mouse fertility, in addition to its well-defined role as a neurogenesis factor. Nevertheless, its physiological roles in ovarian granulosa cells (GC) have not been determined. In this study, mouse GC were cultured and transfected with ephrin A5 siRNA and negative control to determine the effects of Efna5 on GC apoptosis, proliferation, cell cycle progression, and related signaling pathways. To understand the mode signaling, the mRNA expression levels of Efna5 receptors (Eph receptor A5, Eph receptor A3, Eph receptor A8, and Eph receptor B2) were examined...
April 5, 2018: Cell Cycle
https://www.readbyqxmd.com/read/29615536/protective-effects-of-melatonin-against-nicotine-induced-disorder-of-mouse-early-folliculogenesis
#17
Yu-Feng Wang, Xiao-Feng Sun, Ze-Li Han, Lan Li, Wei Ge, Yong Zhao, Massimo De Felici, Wei Shen, Shun-Feng Cheng
In this paper, we show that neonatal mice injected for five consecutive days with nicotine display impaired germ cell cyst breakdown and primordial follicle assembly resulting in decreased ovarian reserve lasting until sex maturation age. The effects of nicotine on the pups ovaries were associated with decreased expression of oocyte specific genes such as Nobox , Lhx8 , Figlα and Sohlh2 . Moreover, the ovaries of pups injected with nicotine showed increased level of cell oxidative stress and autophagic markers (upregulation of AMPKα-1, increased ratio LC3-II/LC3-I, downregulation of AKT and mTOR)...
March 28, 2018: Aging
https://www.readbyqxmd.com/read/29614400/effect-of-inhibin-a-on-proliferation-of-porcine-granulosa-cells-in-vitro
#18
Wanhong Li, Chunjin Li, Shuxiong Chen, Lina Sun, Hongjiao Li, Lu Chen, Xu Zhou
Inhibins regulate folliculogenesis, gametogenesis and hormone secretion via endocrine, paracrine and autocrine manners, and play roles in encouraging or suppressing proliferation of cells. In order to investigate the effects of inhibin A on proliferation and apoptosis of porcine granulosa cells (GCs), GCs were isolated from ovarian follicles (3-6 mm), treated with inhibin A at different concentrations. The cell viability, mitochondrial membrane potential (MMP), expression of proliferation-related genes and cell cycle were detected...
March 26, 2018: Theriogenology
https://www.readbyqxmd.com/read/29607795/ovarian-cycle-in-devario-aequipinnatus-with-emphasis-on-oogenesis
#19
Laíza Maria de Jesus-Silva, Pricila Viana de Oliveira, Cristiéle da Silva Ribeiro, Alexandre Ninhaus-Silveira, Rosicleire Veríssimo-Silveira
SummaryThis study aimed to understand how germ cell development occurs in females of Devario aequipinnatus, by morphologically describing oogenesis and the reproductive phases. Sexually mature females of D. aequipinnatus (n = 70) were obtained from commercial fisheries and delivered to the Laboratório de Ictiologia Neotropical, UNESP, Ilha Solteira, SP, Brazil. The ovaries were removed, fragmented and fixed following the usual techniques for light microscopy. The stages of ovarian development in D. aequipinnatus begin with the oogonia, which proliferate into new cells or differentiate into prophasic oocytes that, at the end of this process, form the ovarian follicle and end folliculogenesis...
April 2, 2018: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/29602728/imaging-the-ovary
#20
REVIEW
Yi Feng, Amin Tamadon, Aaron J W Hsueh
During each reproductive cycle, the ovary exhibits tissue remodelling and cyclic vasculature changes associated with hormonally regulated folliculogenesis, follicle rupture, luteal formation and regression. However, the relationships among different types of follicles and corpora lutea are unclear, and the role of ovarian vasculature in folliculogenesis and luteal dynamics has not been extensively investigated. Understanding of ovarian physiology and pathophysiology relies upon elucidation of ovarian morphology and architecture...
March 6, 2018: Reproductive Biomedicine Online
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