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https://www.readbyqxmd.com/read/28666321/androgens-regulate-ovarian-gene-expression-through-modulation-of-ezh2-expression-and-activity
#1
Xiaoting Ma, Emily Hayes, Anindita Biswas, Christina Seger, Hen Prizant, Stephen R Hammes, Aritro Sen
Significant evidence suggests that androgen signaling through classical androgen receptors is critical for both normal and pathologic ovarian physiology. Specifically, we and others have shown that, in mouse granulosa cells, androgen actions through both extra-nuclear and nuclear androgen receptor signaling are critical for normal follicle development and ovulation. Here we show that androgens through the PI3K/Akt pathway rapidly (within minutes) phosphorylate and inhibit activity of the Polycomb group protein enhancer of zeste homologue 2 (Ezh2)...
June 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/28604799/rhythmic-expression-of-circadian-clock-genes-in-the-preovulatory-ovarian-follicles-of-the-laying-hen
#2
Zhichao Zhang, Shuang Lai, Yagang Wang, Liang Li, Huadong Yin, Yan Wang, Xiaoling Zhao, Diyan Li, Mingyao Yang, Qing Zhu
The circadian clock is reported to play a role in the ovaries in a variety of vertebrate species, including the domestic hen. However, the ovary is an organ that changes daily, and the laying hen maintains a strict follicular hierarchy. The aim of this study was to examine the spatial-temporal expression of several known canonical clock genes in the granulosa and theca layers of six hierarchy follicles. We demonstrated that the granulosa cells (GCs) of the F1-F3 follicles harbored intrinsic oscillatory mechanisms in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28532517/expression-of-cocaine-and-amphetamine-regulated-transcript-cart-in-hen-ovary
#3
Pengfei Li, Xuejing Yu, Jianshan Xie, Xiaolei Yao, Wenzhong Liu, Jianbo Yao, Zhiwei Zhu, Lihua Lyu
BACKGROUND: Cocaine- and amphetamine-regulated transcript (CART), discovered initially by via differential display RT-PCR analysis of brains of rats administered cocaine, is expressed mainly in central nervous system or neuronal origin cells, and is involved in a wide range of behaviors, such as regulation of food intake, energy homeostasis, and reproduction. The hens egg-laying rate mainly depends on the developmental status of follicles, expression of CART have not been identified from hen follicles, the regulatory mechanisms of CART biological activities are still unknown...
May 22, 2017: Biological Research
https://www.readbyqxmd.com/read/28512792/expression-of-aquaporin-4-in-the-chicken-ovary-in-relation-to-follicle-development
#4
M Nowak, M Grzesiak, N Saito, M Kwaśniewska, A Sechman, A Hrabia
In the mammalian ovary, aquaporins (AQPs) are thought to be involved in the regulation of fluid transport within the follicular wall and antrum formation. Data concerning the AQPs in the avian ovary is very limited. Therefore, the present study was designed to examine whether the AQP4 is present in the chicken ovary, and if so, what is its distribution in the ovarian compartment of the laying hen. Localization of AQP4 in the ovarian follicles at different stage of development was also investigated. After decapitation of hens the stroma with primordial follicles and white (1-4 mm), yellowish (4-8 mm), small yellow and the three largest yellow pre-ovulatory follicles F3-F1 (F3 < F2 < F1; 20-36 mm) were isolated from the ovary...
May 16, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28493941/influence-of-three-lighting-regimes-during-ten-weeks-growth-phase-on-laying-performance-plasma-levels-and-tissue-specific-gene-expression-of-reproductive-hormones-in-pengxian-yellow-pullets
#5
Shunshun Han, Yan Wang, Lingyan Liu, Diyan Li, Zihao Liu, Xiaoxu Shen, Hengyong Xu, Xiaoling Zhao, Qing Zhu, Huadong Yin
The study was conducted to optimize lighting schedule for pre-pubertal (12 to 22 weeks) Chinese native breed Pengxian yellow pullet. A total of 414 healthy pullets (10 weeks), with similar body weight were randomly distributed into three groups (n = 138) and housed in individual cages for up to 12 weeks of age in light controlled rooms and provided normal lighting schedule (10L:14D). At 12 to 18 weeks of age, pullets were housed in three rooms, having varying lighting schedule viz. G1 (8L: 16D), G2 (10L:14D), or G3 (12L:12D)...
2017: PloS One
https://www.readbyqxmd.com/read/28432872/human-effector-memory-t-helper-cells-engage-with-mouse-macrophages-and-cause-graft-versus-host-like-pathology-in-skin-of-humanized-mice-used-in-a-nonclinical-immunization-study
#6
Balasai Sundarasetty, Valery Volk, Sebastian J Theobald, Susanne Rittinghausen, Dirk Schaudien, Vanessa Neuhaus, Constanca Figueiredo, Andreas Schneider, Laura Gerasch, Adele Mucci, Thomas Moritz, Constantin von Kaisenberg, Loukia M Spineli, Katherina Sewald, Armin Braun, Henning Weigt, Arnold Ganser, Renata Stripecke
Humanized mice engrafted with human hematopoietic stem cells and developing functional human T-cell adaptive responses are in critical demand to test human-specific therapeutics. We previously showed that humanized mice immunized with long-lived induced-dendritic cells loaded with the pp65 viral antigen (iDCpp65) exhibited a faster development and maturation of T cells. Herein, we evaluated these effects in a long-term (36 weeks) nonclinical model using two stem cell donors to assess efficacy and safety. Relative to baseline, iDCpp65 immunization boosted the output of effector memory CD4(+) T cells in peripheral blood and lymph nodes...
June 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28339778/effects-of-an-induced-molt-using-cassava-meal-on-body-weight-loss-blood-physiology-ovarian-regression-and-postmolt-egg-production-in-late-phase-laying-hens
#7
N Gongruttananun, P Kochagate, K Poonpan, N Yu-Nun, J Aungsakul, N Sopa
This study was conducted to determine the effect of an induced molt using cassava meal on body weight, blood physiology, ovary, and postmolt performance in late-phase (74 wk old) H&N Brown laying hens. Hens were randomly assigned to 3 treatments of 90 birds each: 1) Controls withno induced molt (CONT); 2) molted by full feeding with cassava meal for 3 wk (FP3); and 3) molted by full feeding with cassava meal for 4 wk (FP4). Groups 2 and 3 were fed a pullet developer diet for 3 wk following treatment. During the molt period, the birds were exposed to an 8L:16D photoperiod and had access to drinking water at all times...
June 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28238709/occludin-expression-and-regulation-in-small-follicles-of-the-layer-and-broiler-breeder-hen
#8
C S Stephens, P A Johnson
Synchronized yolk accumulation and follicle development are essential for egg production in oviparous species. In birds, yolk is incorporated into the oocyte by an avian specific yolk receptor (LR8), and it has been suggested that occludin (OCLN), a tight junction protein, mediates transfer of yolk material to the oocyte surface. OCLN may be a key regulator of yolk accumulation and follicle growth, however, the expression and regulation of OCLN in granulosa cells during various stages of follicle development is unknown...
February 24, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28008984/melatonin-implantation-improved-the-egg-laying-rate-and-quality-in-hens-past-their-peak-egg-laying-age
#9
Yaxiong Jia, Minghui Yang, Kuanfeng Zhu, Liang Wang, Yukun Song, Jing Wang, Wenxiang Qin, Zhiyuan Xu, Yu Chen, Guoshi Liu
The egg-laying rates of hens approximately 470 days of age exhibited a positive correlation to blood melatonin levels. The hens with an egg-laying rate <30%, 30~90% and ≥90% had blood melatonin levels of 5.8 ± 2.6, 74.0 ± 32.9 and 445.9 ± 115.3 ng/ml, respectively. When 10 mg of melatonin was implanted into the hens at 300, 360, 470 and 550 days of age, the egg-laying rates increased 4.63 ± 0.46%, 8.38 ± 1.45%, 4.93 ± 0.85% and 7.93 ± 0.91%, respectively, compared to that of the controls...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27832956/effects-of-pcb-126-and-pcb-153-on-secretion-of-steroid-hormones-and-mrna-expression-of-steroidogenic-genes-star-hsd3b-cyp19a1-and-estrogen-receptors-er%C3%AE-er%C3%AE-in-prehierarchical-chicken-ovarian-follicles
#10
Andrzej Sechman, Marta Batoryna, Piotr A Antos, Anna Hrabia
The objective of this study was to assess the in vitro effects of dioxin-like PCB 126 and non-dioxin-like PCB 153 on basal and ovine LH (oLH)-stimulated testosterone (T) and estradiol (E2) secretion and expression of steroidogenic genes (STAR, HSD3B and CYP19A1) and estrogen receptors α (ERα) and β (ERβ) in white (WF) and yellowish (YF) prehierarchical follicles of the hen ovary. Steroid concentrations in a medium and gene expression in follicles following 6h of exposition were determined by RIA and real-time qPCR, respectively...
December 15, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27665009/effects-of-dietary-octacosanol-supplementation-on-laying-performance-egg-quality-serum-hormone-levels-and-expression-of-genes-related-to-the-reproductive-axis-in-laying-hens
#11
L Long, S G Wu, F Yuan, H J Zhang, J Wang, G H Qi
This experiment was conducted to evaluate the effects of dietary octacosanol supplementation on laying performance, egg quality, serum hormone levels, and gene expression related to reproductive axis in laying hens to confirm the reproduction-promoting function of octacosanol. In total, 360 Hy-Line Brown (67-wk-old) laying hens were randomly assigned to one of three treatments with 0, 5, and 10 mg octacosanol (extracted from rice bran, purity >92%)/kg feed. The feeding trial lasted for 10 weeks. The results showed that the dietary addition of 5 and 10 mg/kg octacosanol improved feed efficiency by 4...
September 24, 2016: Poultry Science
https://www.readbyqxmd.com/read/27636676/effects-of-arsenic-supplementation-in-feed-on-laying-performance-arsenic-retention-of-eggs-and-organs-biochemical-indices-and-endocrine-hormones
#12
X Y Zhang, M Y Zhou, L L Li, Y J Jiang, X T Zou
1. The primary objective of this experiment was to estimate the toxic effects of arsenic (As) supplementation in feed on laying performance, As retention by eggs and organs, serum biochemical indices and endocrine hormones in laying hens. 2. A total of 320 "Jinghong Number 1" hens, 56-week-old, were randomly allocated into four treatments of four replicates with 20 layers in each. Graded arsenical was added to the basal diet in the experimental diets at As levels of 0, 17, 34 and 51 mg/kg, respectively. The trial lasted for 9 weeks including 1 week for acclimatisation...
February 2017: British Poultry Science
https://www.readbyqxmd.com/read/27591285/identification-of-the-gene-product-recognized-by-monoclonal-antibody-giif3
#13
B Felfoldi, A Magyar, N Nagy, I Olah, G T Pharr
The chicken as a research model has a disadvantage compared with the mouse and the human because of the low number of available antibodies against gene products of interest. The goal of this study was to identify the antigen recognized by monoclonal antibody (mAb) GIIF3, which is a 42 kDa protein that appears in follicle-associated epithelium of the guinea hen as well as in different muscle types during chicken embryonic development. The 42 kDa protein, immunoprecipitated from chicken gizzard protein lysates, was evaluated by mass spectrometry...
February 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/27505353/the-hippo-mst-pathway-member-sav1-plays-a-suppressive-role-in-development-of-the-prehierarchical-follicles-in-hen-ovary
#14
Zhichao Lyu, Ning Qin, Thobela Louis Tyasi, Hongyan Zhu, Dehui Liu, Shuguo Yuan, Rifu Xu
The Hippo/MST signaling pathway is a critical player in controlling cell proliferation, self-renewal, differentiation, and apoptosis of most tissues and organs in diverse species. Previous studies have shown that Salvador homolog 1 (SAV1), a scaffolding protein which functions in the signaling system is expressed in mammalian ovaries and play a vital role in governing the follicle development. But the exact biological effects of chicken SAV1 in prehierarchical follicle development remain poorly understood. In the present study, we demonstrated that the SAV1 protein is predominantly expressed in the oocytes and undifferentiated granulosa cells in the various sized prehierarchical follicles of hen ovary, and the endogenous expression level of SAV1 mRNA appears down-regulated from the primordial follicles to the largest preovulatory follicles (F2-F1) by immunohistochemistry and real-time RT-PCR, respectively...
2016: PloS One
https://www.readbyqxmd.com/read/27444439/mechanisms-of-lipid-mobilization-towards-egg-formation-in-broiler-breeder-hens-using-stable-isotopes
#15
C Salas, R D Ekmay, J A England, S Cerrate, C N Coon
The contribution of dietary, mobilized, or newly synthesized fatty acids in yolk formation at different periods of egg production was determined. In an initial experiment, a single dose of (13)C-linoleic acid was administered to pullets at the onset of egg production and their presence in follicles determined over the subsequent 10 days. In a second experiment, pullets were fed a daily 15 mg dose of U-(13)C-glucose beginning 2 wk prior to sexual maturity through the end of the experimental period. A 50 mg meal of U-(13)C-linoleic acid was orally administered approximately 10 d prior to sexual maturity (defined as first egg) representing body linoleic acid...
February 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/27340039/bone-morphogenetic-protein-15-may-promote-follicle-selection-in-the-hen
#16
C S Stephens, P A Johnson
In the hen, optimal ovulation rate depends on selection of a single follicle into the pre-ovulatory hierarchy. Follicle selection is associated with increased oocyte growth and changes in gene expression in granulosa cells surrounding the oocyte, in preparation for ovulation. This study investigated the expression, function and regulation of bone morphogenetic protein-15 (BMP15) during follicle development in the hen. BMP15 mRNA expression was analyzed in the ooplasm and granulosa cells of 3mm follicles and was confirmed to be primarily in the ooplasm...
September 1, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27272257/effects-of-different-levels-of-sanguinarine-on-antioxidant-indices-immunological-responses-ileal-microbial-counts-and-jejunal-morphology-of-laying-hens-fed-diets-with-different-levels-of-crude-protein
#17
M Bavarsadi, A H Mahdavi, S Ansari-Mahyari, E Jahanian
This study was carried out to assess the effects of different levels of sanguinarine on antioxidant indices, immunological responses, serum biochemical parameters, ileal microbial counts and jejunal morphology of laying hens fed on diets with different levels of crude protein (CP). A total of 180 laying hens were subjected into nine dietary treatments with four cages of five birds each. Experimental treatments consisted of three levels of CP (85.0, 92.5 and 100% of Hy-Line W36 manual recommendation) and three levels of sanguinarine (0...
June 8, 2016: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/27173978/dietary-methionine-requirement-of-jing-brown-layer-hens-from-9-to-17%C3%A2-weeks-of-age
#18
G H Meng, D Song, L B Li, C J Yang, Z X Qu, Y P Gao
This study was conducted to evaluate the effect of dietary methionine (Met) supplementation in growth performance and reproductive performance of Jing Brown layer hens. A total of 375 9-week-old Jing Brown layer hens were allocated equally to five treatments consisting of 5 replicates with 15 hens. Hens were fed with a diet of corn and soya bean meal supplemented with 0.23%, 0.27%, 0.31%, 0.35% and 0.39% Met respectively. Different Met levels did not significantly affect average daily feed intake (ADFI), average daily gain (ADG) and feed/gain ratio (F/G) (p > 0...
May 13, 2016: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/27025442/the-effect-of-cooling-management-on-blood-flow-to-the-dominant-follicle-and-estrous-cycle-length-at-heat-stress
#19
RANDOMIZED CONTROLLED TRIAL
Hen Honig, Lior Ofer, Moshe Kaim, Shamay Jacobi, Dima Shinder, Eran Gershon
The use of ultrasound imaging for the examination of reproductive organs has contributed substantially to the fertility management of dairy cows around the world. This method has many advantages such as noninvasiveness and immediate availability of information. Adding Doppler index to the ultrasound imaging examination, improved the estimation of blood volume and flow rate to the ovaries in general and to the dominant follicle in particular. The aim of this study was to examine changes in the blood flow to the dominant follicle and compare them to the follicular development throughout the cycle...
July 15, 2016: Theriogenology
https://www.readbyqxmd.com/read/27021352/vasoactive-intestinal-peptide-promotes-differentiation-and-clock-gene-expression-in-granulosa-cells-from-prehierarchal-follicles
#20
Dongwon Kim, Alan L Johnson
Vasoactive intestinal peptide (VIP) signaling via cyclic adenosine monophosphate (cAMP) is reported to stimulate steroidogenesis in ovarian granulosa cells from a variety of vertebrate species, including the domestic hen. Prior to follicle selection in the hen ovary (i.e., cyclic recruitment) follicle-stimulating-hormone (FSH)-induced cAMP signaling is absent within the granulosa layer until immediately following follicle selection. As a consequence, granulosa cells remain in an undifferentiated state and are unable to initiate FSH-induced steroidogenesis...
May 2016: Molecular Reproduction and Development
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