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Molecular Reproduction and Development

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https://www.readbyqxmd.com/read/28722155/metabolite-availability-as-a-window-to-view-the-early-embryo-microenvironment-in-vivo
#1
REVIEW
Kailun Hu, Yang Yu
A preimplantation embryo exists independent of blood supply, and relies on energy sources from its in vivo environment (e.g. oviduct and uterine fluid) to sustain its development. The embryos can survive in this aqueous environment because it contains amino acids, proteins, lactate, pyruvate, oxygen, glucose, antioxidants, ions, growth factors, hormones, and phospholipids - albeit the concentration of each component varies by species, stage of the estrous cycle, and anatomical location. The dynamic nature of this environment sustains the early development from the one-cell zygote to blastocyst, and is reciprocally influenced by the embryo at each embryonic stage...
July 19, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28710864/localized-accumulation-of-cytosolic-calcium-near-the-fused-sperm-is-associated-with-the-calcium-and-voltage-dependent-block-of-sperm-entry-in-the-sea-urchin-egg
#2
Pedro I Ivonnet, Tatsuma Mohri, David H McCulloh
Sperm-egg interaction depolarizes the egg membrane, allowing the sperm to enter; however, if the egg membrane is not allowed to depolarize from its resting potential (e.g. by voltage-clamp), the sperm will not enter. Previous studies demonstrated that sperm entry into sea urchin eggs that are voltage-clamped at negative membrane potentials is regulated both by the egg's membrane potential and a voltage-dependent influx of calcium into the egg. In these cases, electrical or cytoplasmic continuity (sperm-egg membrane fusion) occurs at negative membrane potentials, but subsequent loss of cytoplasmic continuity results in failure of sperm entry (unfusion)...
July 15, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28708332/oxidative-stress-and-cellular-and-tissue-damage-in-organogenic-outbred-mouse-embryos-after-moderate-perigestational-alcohol-intake
#3
Tamara A Coll, Gabriela Chaufan, Leticia Pérez-Tito, Martín R Ventureira, Cristian M A Sobarzo, María Del Carmen Ríos de Molina, Elisa Cebral
Perigestational alcohol consumption by CF-1 mouse, from before mating up to the period of embryo organogenesis, leads to retarded early embryo development and neural tube defects. Here, we addressed if perigestational alcohol ingestion up to Day 10 of pregnancy induces oxidative stress and changes in macromolecules and organ tissues of early organogenic embryos. Adult CF-1 female mice were administered 10% ethanol in their drinking water for 17 days prior to mating and until Day 10 of gestation, whereas control females were administered ethanol-free water...
July 14, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28708258/creating-chimeras-embryonic-stem-cells-incorporated
#4
Osvaldo Bogado Pascottini, Daniel E Goszczynski, Alexandra L Nguyen
Gene modification within the murine genome has become a powerful and invaluable tool to investigate development. One example of the utility of such technology is providing a method by which researchers can follow cells throughout development via the introduced genetic modifications.
July 14, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28700112/mammalian-blastocyst-mimicry
#5
Niccolò Bianchi, Marianna Longo, CarloAlberto Redi, Manuela Monti
A gradual restriction in stem cells potency is observed during the different stages of mammalian embryonic development, starting with the zygote, the totipotent stem cell par excellence, up to the blastocyst stage. Stem cells of the inner cell mass are endowed with pluripotent characteristic, being able to form cells of the three germ layers (ectoderm, endoderm, and mesoderm). Pluripotent stem cells retain proliferative capacity throughout the life of an individual, and divide asymmetrically, wherein one cell is the copy of the original stem cell while the other is programmed to begin the differentiation process...
July 12, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28700107/cigarette-smoke-induces-rat-testicular-injury-via-mitochondrial-apoptotic-pathway
#6
He Lijuan, You Shuping, Gong Haiyan, Zhang Jing, Wang Li, Zhang Chen, Huang Yunfei, Zhong Chunxue, Zou Ying
An understanding of the causative mechanisms of the harmful effects of cigarette smoke on the male reproductive system remains incomplete. Here, we investigated three different inhaled cigarette smoke doses over five different exposure durations to identify how the testis is affected. The effects of cigarette smoke exposure on testicular germ cells were characterized by morphological changes and a significant elevation in the number of apoptotic cells. Caspase 3 activation increased dramatically after cigarette smoke exposure, accompanied by significant time-dependent expression of the pro-apoptotic proteins Bak (B cell lymphoma/leukemia 2 [Bcl-2] homologous antagonist killer), Bcl2l11 (a BH3 domain-only protein related to Bcl-2), Apaf1 (Apoptotic protease-activating factor-1), and Caspase 9...
July 12, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28696579/scrotal-insulation-and-sperm-production-in-the-boar
#7
REVIEW
John J Parrish, Kilby L Willenburg, Katelynn M Gibbs, Kylie B Yagoda, Megan M Krautkramer, Teyanna M Loether, Fabiana C S A Melo
Seasonal infertility is a limiting factor in boar fertility, and is increasingly important as climate changes. Spermatogenesis in the boar produces 256 spermatozoa per type A1 spermatogonium, but the process is inefficient such that only 10-30% of these potential spermatozoa are actually produced. Heat further impacts spermatogenesis by reducing the number of specific germ cells produced while increasing the fraction of abnormal sperm. Early studies used whole-animal exposure to simulate seasonal exposure to heat under production settings, but this approach is associated with many confounding factors that make assessment of the mechanisms of heat-induced damage to spermatogenesis difficult...
July 11, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28696547/heat-stress-in-pregnant-sows-thermal-responses-and-subsequent-performance-of-sows-and-their-offspring
#8
REVIEW
Matthew C Lucy, Timothy J Safranski
Seasonal infertility is a significant problem in the swine industry, and may be influenced by photoperiod and heat stress. Heat stress during gestation in particular affects pregnancy, resulting in long-term developmental damage to the offspring. This review summarizes what is known about how heat stress on the pregnant sow affects lactation and her offspring. Sows responded to heat stress during gestation with increased rectal temperature, respiration rate, and skin temperature, and tended to reduce their activity-which may have changed their body composition, increasing the adipose-to-muscle ratio...
July 11, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28688214/uterine-molecular-changes-for-non-invasive-embryonic-attachment-in-the-marsupials-macropus-eugenii-macropodidae-and-trichosurus-vulpecula-phalangeridae
#9
Melanie K Laird, Jessica R Dargan, Lillian Paterson, Christopher R Murphy, Bronwyn M McAllan, Geoff Shaw, Marilyn B Renfree, Michael B Thompson
Pregnancy in mammals requires remodelling of the uterus to become receptive to the implanting embryo. Remarkably similar morphological changes to the uterine epithelium occur in both eutherian and marsupial mammals, irrespective of placental type. Nevertheless, molecular differences in uterine remodelling indicate that the marsupial uterus employs maternal defences, including molecular reinforcement of the uterine epithelium, to regulate embryonic invasion. Non-invasive (epitheliochorial) embryonic attachment in marsupials likely evolved secondarily from invasive attachment, so uterine defences in these species may prevent embryonic invasion...
July 8, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28667793/physiological-mechanisms-through-which-heat-stress-compromises-reproduction-in-pigs
#10
REVIEW
Jason W Ross, Benjamin J Hale, Jacob T Seibert, Matthew R Romoser, Malavika K Adur, Aileen F Keating, Lance H Baumgard
Seasonal variations in environmental temperatures impose added stress on domestic species bred for economically important production traits. These heat-mediated stressors vary on a seasonal, daily, or spatial scale, and negatively impact behavior and reduce feed intake and growth rate, which inevitably lead to reduced herd productivity. The seasonal infertility observed in domestic swine is primarily characterized by depressed reproductive performance, which manifests as delayed puberty onset, reduced farrowing rates, and extended weaning-to-estrus intervals...
July 1, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28667774/when-sperm-meets-egg-the-spark-of-new-life
#11
Katherine Lynn Wozniak, Guillermina Maria Luque, Soo Hyun Ahn
Activation following fertilization reawakens the quiescent egg and inhibits polyspermy. Oscillating cytoplasmic Ca(2+) concentrations ([Ca(2+) ]) during egg activation are a highly conserved event that have persisted through the course of evolution. For example, fertilization in the starfish Asterina miniata results in two Ca(2+) -dependent processes in the fertilized egg.
July 1, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28661576/physiological-alterations-associated-with-intrauterine-growth-restriction-in-fetal-pigs-causes-and-insights-for-nutritional-optimization
#12
REVIEW
Junjun Wang, Cuiping Feng, Ting Liu, Meng Shi, Guoyao Wu, Fuller W Bazer
Intrauterine growth restriction (IUGR) remains a major problem in swine production since the associated low birth weight leads to high rates of pre-weaning morbidity and mortality plus permanent retardation of growth and development. Complex biological events-including genetics, epigenetics, maternal maturity, maternal nutrition, placenta efficiency, uterine capacity, and other environmental factors-can affect fetal growth and development during late gestation, as well as maturity of oocytes, duration of estrus, and both implantation and placentation of conceptuses in uteri of sows...
June 29, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28661560/pregnancy-and-spontaneous-fetal-loss-a-pig-perspective
#13
REVIEW
Mallikarjun Bidarimath, Chandrakant Tayade
Pigs have a unique, non-invasive epitheliochorial placenta where maternal and fetal layers lay in apposition. Indentation of fetal capillaries into the trophoblasts and maternal capillaries into the uterine epithelium reduce the distance between the fetal and maternal blood, ensuring nutrient transfer for proper conceptus development. Another unique feature of pig pregnancy is conceptus-mediated immune cell enrichment during the early stages of conceptus attachment (around gestation Day 15). This period coincides with the development of vasculature networks at the maternal-fetal interface, which is critical for successful conceptus growth...
June 29, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28661063/flourishing-follicles-overview-of-ovariolas
#14
Andrew M Kelleher, Kasra Khalaj, Jacinta H Martin, Maria Florencia Scaia, Rebecca L Wilson
Ovarian follicle development is essential for the propagation of species. In Drosophila melanogaster, follicle development occurs through a spectacularly coordinated sequence within the highly polarized ovariole (pictured). A single ovary contains more than a dozen ovarioles that cluster together to form bud-like structures. Gentle mechanical disruption of the ovary allows for the separation and visualization of individual ovarioles and, thus, the progression of follicle development. This article is protected by copyright...
June 29, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28643872/circulating-microrna-as-candidates-for-early-embryonic-viability-in-cattle
#15
K G Pohler, J A Green, L A Moley, S Gunewardena, W T Hung, R R Payton, X Hong, L K Christenson, T W Geary, M F Smith
Blood-borne extracellular vesicles (i.e. exosomes and microvesicles) carrying microRNAs (miRNAs) could make excellent biomarkers of disease and different physiologic states, including pregnancy status. We tested the hypothesis that circulating extracellular vesicle-derived miRNAs might differentiate the pregnancy status of cows that had maintained pregnancy to Day 30 from non-pregnant cows or from those that exhibited embryonic mortality between Days 17-30 of gestation. Cows were randomly assigned for artificial insemination with fertile semen (n= 36) or dead semen (n = 8; control group) on Day 0 (day of estrus)...
June 23, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28636231/orchestration-at-the-beginning-mitosis-in-sea-urchin-embryo
#16
Giselle A Abruzzese, Nae Tanpradit, Renata S Tavares
Development of multicellular organisms is driven by a series of mitotic divisions after fertilization. Total cytoplasmic volume does not increase during this process, resulting in an increasing number of smaller daughter cells. Cell divisions are initially synchronous in an early embryo, but this ends at the 16-cell stage in the sea urchin. Orchesterated mitosis does, however, continue in subpopulations via the coordination of two different processes: karyokinesis and cytokinesis. Part of this asynchrony is due to the differentiation of lineages...
June 21, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28636161/infinity-sperm-storage-the-gift-that-keeps-on-giving
#17
Gauthier Schang, Beatriz Fernandez-Fuertes, Samantha C Lean, Alexandra L Nguyen, Osvaldo Bogado Pascottini
Female Drosophila retain sperm for up to two weeks post-copulation in a network of storage organs includng the bursa, the seminal receptacle, and the spermathecae. This image shows the seminal receptacle of a Drosophila melanogaster female, 2-hrs post-copulation between a LHM (wild-type) female with a Protamine B (green), β-Tubulin (blue) fluorescently tagged male, whose sperm can be visualized within the female. This 'infinity' structure of the seminal receptacle resembles the tubular coil that allows for the storage of very long sperm relative to female body size -up to 20 times the length of the female in some Drosophila species...
June 21, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28636144/preface
#18
EDITORIAL
Cheryl J Ashworth
No abstract text is available yet for this article.
June 21, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28628266/embryo-maternal-dialogue-during-pregnancy-establishment-and-implantation-in-the-pig
#19
REVIEW
Agnieszka Waclawik, Monika M Kaczmarek, Agnieszka Blitek, Piotr Kaczynski, Adam J Ziecik
Porcine conceptuses secrete pregnancy-recognition signals (estrogens, including estradiol-17β) that inhibit luteolysis, thereby prolonging progesterone production by corpora lutea. The supportive mechanism by which the conceptus also inhibits luteolysis is by shifting endometrial prostaglandin (PG) synthesis to luteoprotective PGE2. Progesterone stimulates endometrial production of factors that are essential for conceptus development. Priming the uterus by progesterone and loss of progesterone receptors from the uterine epithelium by D1ay 10-12 after estrus are key for achieving endometrial receptivity for implantation...
June 19, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28628264/controlling-lactation-oestrus-the-final-frontier-for-breeding-herd-management
#20
REVIEW
William H E J van Wettere, Alice C Weaver, Emma C Greenwood, Robyn Terry, Paul E Hughes, Karen L Kind
Lactation anoestrus limits the flexibility of modern pig production systems such that any increase in lactation length reduces farrowing frequency, and thus profit. This review focuses on post-partum development of the sow's reproductive system, the physiology of lactation anoestrus and how it can be overcome, as well as the fertility of sows mated while lactating. The propensity for sows to ovulate spontaneously while lactating is high (24-31%), and a high proportion of sows will ovulate rapidly and synchronously in response to combinations of altered suckling (split weaning, interrupted suckling), daily boar contact, exogenous gonadotrophins, and group housing...
June 19, 2017: Molecular Reproduction and Development
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