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https://www.readbyqxmd.com/read/27902923/kisspeptin-expression-is-decreased-in-the-arcuate-nucleus-of-hypothyroid-female-rats-with-irregular-estrus-cycles
#1
Yuji Tomori, Ken Takumi, Norio Iijima, Shinro Takai, Hitoshi Ozawa
Insufficiency of thyroid hormones inhibits gonadotropin release and results in dysregulation of reproductive function, although the precise mechanism of this disrupted gonadotropin secretion remains unclear. Kisspeptin is a neuropeptide that strongly stimulates gonadotropin secretion and plays an important role in reproductive function. To examine the involvement of kisspeptin in the dysregulation of gonadotropin secretion in hypothyroidism, we investigated Kiss1 mRNA expression and kisspeptin immunoreactivity in the hypothalamus of female rats treated with propylthiouracil (PTU)...
November 27, 2016: Neuroscience Research
https://www.readbyqxmd.com/read/27899720/luteal-function-during-the-estrous-cycle-in-arginine-treated-ewes-fed-different-planes-of-nutrition
#2
Casie S Bass, Dale A Redmer, Samantha L Kaminski, Anna T Grazul-Bilska
Corpus luteum (CL) functions are influenced by numerous factors including hormones, growth and angiogenic factors, nutritional plane, and dietary supplements such as arginine (Arg), a semi-essential amino acid and precursor for proteins, polyamines, and nitric oxide (NO). The aim of this study was to determine if Arg supplementation to ewes fed different planes of nutrition impacts 1) progesterone (P4) concentrations in serum and luteal tissue, 2) luteal vascularity, cell proliferation, endothelial NO synthase (eNOS), and receptor (R) soluble guanylate cyclase β protein and mRNA expression, and 3) luteal mRNA expression for selected angiogenic factors during the estrous cycle...
November 29, 2016: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27898863/rapid-communication-expression-of-an-endogenous-retroviral-element-during-early-gestation-in-beef-heifers
#3
K J McLean, M S Crouse, M R Crosswhite, D N Black, C R Dahlen, P P Borowicz, L P Reynolds, A K Ward, B W Neville, J S Caton
Endogenous retroviral gene elements have been implicated in development and formation of the feto-maternal interface. A variant of the syncytin endogenous retroviral envelope gene family, , was recently found in ruminants. We hypothesized that mRNA would be differentially expressed in utero-placental tissues and would fluctuate during key time points of early gestation in beef heifers. Commercial Angus crossbred heifers ( = 46; ∼15 mo of age; BW = 362.3 ± 34.7kg) housed in 6-animal pens were fed daily with native grass hay and supplemented with cracked corn to gain 0...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898848/rapid-communication-isolation-of-glucose-transporters-and-in-bovine-uteroplacental-tissues-from-days-16-to-50-of-gestation
#4
M S Crouse, J S Caton, K J McLean, P P Borowicz, L P Reynolds, C R Dahlen, B W Neville, A K Ward
Glucose transporter solute carrier family 2 member 14 () is a duplicon of glucose transporter solute carrier family 2 member 3 () with a 95% shared homology to and has not previously been isolated in ruminant uteroplacental tissues. The transporter has been previously isolated in Holstein heifer uterine epithelium but not in ovine epithelium. We hypothesized that and its duplicon would be found in bovine uteroplacental tissues and that maternal nutrition and day of gestation would impact mRNA expression of and ...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27876215/serological-evaluation-of-ovarian-steroids-of-red-rumped-agouti-dasyprocta-leporina-during-the-estrous-cycle-phases
#5
Michele D Singh, Michael J Morris, Diva Anelie Guimarães, Gregory Bourne, Gary W Garcia
The objective of this study was to evaluate serum progesterone (P4) and 17β estradiol (E2) concentrations throughout the estrous cycle in the red-rumped agouti (Dasyprocta leporina). A total of eight multiparous, captive-bred females were bled throughout their estrous cycle via saphenous venipuncture, with E2 and P4 concentrations being measured via ELISA of the serum collected. Serum E2 ranged from 1212 to 3500pg/ml with a peak value coinciding with observed estrus. However, two additional peak values for E2 were also recorded, one each in metestrus and proestrus respectively...
December 2016: Animal Reproduction Science
https://www.readbyqxmd.com/read/27875754/the-impact-of-diet-and-arginine-supplementation-on-pancreatic-mass-digestive-enzyme-activity-and-insulin-containing-cell-cluster-morphology-during-the-estrous-cycle-in-sheep
#6
F E Keomanivong, A T Grazul-Bilska, D A Redmer, C S Bass, S L Kaminski, P P Borowicz, J D Kirsch, K C Swanson
To determine the effect of feed intake and arginine treatment during different stages of the estrous cycle on pancreatic mass, digestive enzyme activity, and histological measurements, ewes (n = 120) were randomly allocated to 1 of 3 dietary groups; control (CON; 2.14-Mcal metabolizable energy/kg), underfed (UF; 0.6 × CON), or overfed (OF; 2 × CON) over 2 yr. Estrus was synchronized using a controlled internal drug release device for 14 d. At controlled internal drug release withdrawal, ewes from each dietary group were assigned to 1 of 2 treatments; Arg (L-Arg HCl, 155-μmol/kg BW) or Sal (approximately 10-mL saline)...
October 21, 2016: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/27872713/expression-of-pluripotent-stem-cell-markers-in-mouse-uterine-tissue-during-estrous-cycle
#7
Kolsum Choobineh, Saeed Zavareh, Mojdeh Salehnia, Mohamad Taghi Ghorbanian, Seyed Hassan Paylakhi
It was assumed that uterine stem cells are responsible for the unique regenerative capacity of uterine. Therefore, the aim of the present study was to investigate the expression of the pluripotent stem cell markers in the mice uterine tissue during different stages of estrous cycles. Twelve virgin female NMRI mice (6 to 8 weeks old) were considered at proestrus, estrus, metestrus and diestrus according to the cell types observed in the vaginal smear and underwent hysterectomy operation. Quantitative real-time polymerase chain reaction (PCR) and immunohistochemical staining for pluripotent stem cell markers (SOX2, OCT4, KLF4, and NANOG) were performed...
2016: Veterinary Research Forum
https://www.readbyqxmd.com/read/27868280/chlamydial-infection-enhances-expression-of-the-polymeric-immunoglobulin-receptor-pigr-and-transcytosis-of-iga
#8
Charles W Armitage, Connor P O'Meara, Kenneth W Beagley
PROBLEM: The pIgR mediates transport of IgA into the lumen of mucosal tissues preventing pathogenic infection. Despite this, the expression of pIgR during chlamydial infections of the male and female reproductive tracts remains poorly understood. METHOD OF STUDY: The expression of pIgR in response to hormone cycling or over the course of chlamydial infection was determined in vitro and in vivo by Western blot or immunohistochemistry. RESULTS: PIgR was upregulated in response to Chlamydia spp...
November 21, 2016: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/27847429/evaluation-of-salivary-electrolytes-during-estrous-cycle-in-murrah-buffaloes-with-reference-to-estrus-detection
#9
Indu Devi, Pawan Singh, Surerder Singh Lathwal, A Kumaresan, Kuldeep Dudi
AIM: Timely estrus detection is one of the critical factors for increasing reproductive efficiency in buffaloes. In recent decades, saliva has become a more popular as a noninvasive source for determining physiological status of animals by various biochemical electrolytes. This study was designed to assess and correlate changes in different salivary minerals concentration (calcium, inorganic phosphorus, magnesium, sodium, potassium, and chloride) during different stages of the estrous cycle in Murrah buffaloes...
October 2016: Veterinary World
https://www.readbyqxmd.com/read/27845690/characterization-of-the-cervical-mucus-plug-in-mares
#10
S C Loux, K E Scoggin, M H T Troedsson, E L Squires, B A Ball
The cervical mucus plug (CMP) is believed to play an integral role in the maintenance of pregnancy in the mare, primarily by inhibiting microbial entry. Unfortunately, very little is known about its composition or origin. To determine the proteomic composition of the CMP, we collected CMPs from mares (n = 4) at 9 months of gestation, and proteins were subsequently analyzed by nano-LC-MS/MS. Results were searched against EquCab2.0, and proteomic pathways were predicted by Ingenuity Pathway Analysis. Histologic sections of the CMP were stained with H&E and PAS...
February 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27842717/mhc-correlated-preferences-in-diestrous-female-horses-equus-caballus
#11
D Burger, C Meuwly, E Marti, H Sieme, M Oberthür, J Janda, S Meinecke-Tillmann, C Wedekind
Genes of the major histocompatibility complex (MHC) have been shown to influence communication in many vertebrates, possibly with context-specific MHC-correlated reactions. Here we test for MHC-linked female preferences in the polygynous horse (Equus caballus) by repeatedly exposing 19 mares to a group of seven sexually experienced stallions. Each mare was tested four times during two consecutive reproductive cycles, twice during estrus and twice during diestrus. Male plasma testosterone concentrations were determined from weekly blood samples, and equine leukocyte antigen (ELA) class I and II alleles were determined serologically at the end of the experiments...
September 20, 2016: Theriogenology
https://www.readbyqxmd.com/read/27837330/reinforcing-properties-of-an-intermittent-low-dose-of-ketamine-in-rats-effects-of-sex-and-cycle
#12
Katherine N Wright, Caroline E Strong, Marjorie N Addonizio, Naomi C Brownstein, Mohamed Kabbaj
RATIONALE: Repeated intermittent exposure to ketamine has rapid and long-lasting antidepressant effects, but the abuse potential has only been assessed at high doses. Furthermore, while females are more susceptible to depression and more sensitive to ketamine's antidepressant-like effects, the abuse potential for ketamine in females is unknown. OBJECTIVES: The objectives of this study are to determine the reinforcing properties of low-dose intermittent ketamine in adult rats of both sexes and determine whether cycling gonadal hormones influence females' response to ketamine...
November 11, 2016: Psychopharmacology
https://www.readbyqxmd.com/read/27821469/removal-of-mouse-ovary-fat-pad-affects-sex-hormones-folliculogenesis-and-fertility
#13
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/27809846/the-participation-of-the-muscarinic-receptors-in-the-preoptic-anterior-hypothalamic-areas-in-the-regulation-of-ovulation-depends-on-the-ovary
#14
Adriana Espinosa-Valdez, Angélica Flores, Isabel Arrieta-Cruz, Mario Cárdenas, Roberto Chavira, Roberto Domínguez, María Esther Cruz
BACKGROUND: Muscarinic receptors (mAChRs) of the preoptic and anterior hypothalamus areas (POA-AHA) regulate ovulation in an asymmetric manner during the estrous cycle. The aims of the present study were to analyze the effects of a temporal blockade of mAChRs on either side of the POA-AHA performed in diestrus-2 rats on ovulation, the levels of estradiol, follicle stimulating hormone (FSH) and luteinizing hormone (LH) and the mechanisms involved in changes in ovulation. METHODS: Cyclic rats on diestrus-2 day were anesthetized and randomly assigned to the following groups: 1) microinjection of 1 μl of saline or atropine solution (62...
November 4, 2016: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/27773477/identification-and-profiling-of-micrornas-from-ovary-of-estrous-kazakh-sheep-induced-by-nutritional-status-in-the-anestrous-season
#15
Heng Yang, Shan Lin, Xiaoping Lei, Cong Yuan, Zhanwei Tian, Yaosheng Yu, Zongsheng Zhao, Jingbo Chen
Estrous regulation in sheep has an important role in the sheep industry in improving production of meat and wool. It has been reported that an enhanced nutritional status can induce estrus resulting in an end of the anestrous season earlier than occurs in ewes with a lesser nutritional status. However, the endocrine and physiological mechanisms that induce the increased incidence of estrus remains unclear. In the present study, the differences in amounts and characteristics of miRNAs in ewes at estrus or during the anestrous season were screened by using the Illumina HiSeq sequencing technology...
December 2016: Animal Reproduction Science
https://www.readbyqxmd.com/read/27746040/expression-of-aquaporin-7-and-aquaporin-9-in-tanycyte-cells-and-choroid-plexus-during-mouse-estrus-cycle
#16
A Yaba, B Sozen, B Suzen, N Demir
Tanycytes are special ependymal cells located in the ventrolateral wall and floor of the third ventricle having processes extending nuclei that regulate reproductive functions and around of vessels in median eminance. The aquaporins (AQPs) are a family of transmembrane proteins that transport water and glycerol. AQP-7 and -9 are permeable to other small molecules as glycerol and therefore called aquaglyceroporins. In this study, we aimed to show localization of AQP-7 and -9 in epithelial cells of choroid plexus and tanycytes during female mouse estrus cycle...
October 13, 2016: Morphologie: Bulletin de L'Association des Anatomistes
https://www.readbyqxmd.com/read/27717109/follicular-development-and-morphological-changes-in-the-vaginal-epithelium-during-the-estrous-cycle-of-galea-spixii
#17
Amilton Cesar Dos Santos, Diego Carvalho Viana, Gleidson Benevides Oliveira, Renata Santos Silva, Moacir Franco Oliveira, Antônio Chaves Assis-Neto
The current study aimed to determine if characteristics observed in vaginal cytology during the estrous cycle of female SYT cavies corresponded with proliferation of the vaginal epithelium, characterized by proliferating cell nuclear antigen (PCNA) immunolocalization, and with follicular development at different phases of the estrous cycle. After determining estrous cycle phases by vaginal cytology, females were euthanized at metestrus, diestrus, proestrus, and estrus. Histological study of the vaginal epithelium and ovary were then performed...
October 7, 2016: Microscopy Research and Technique
https://www.readbyqxmd.com/read/27715255/pulse-and-surge-profiles-of-luteinizing-hormone-secretion-in-the-mouse
#18
Katja Czieselsky, Mel Prescott, Robert Porteous, Pauline Campos, Jenny Clarkson, Frederik J Steyn, Rebecca E Campbell, Allan E Herbison
Using a new tail-tip bleeding procedure and a sensitive ELISA, we describe here the patterns of LH secretion throughout the mouse estrous cycle; in ovariectomized mice; in ovariectomized, estradiol-treated mice that model estrogen-negative and -positive feedback; and in transgenic GNR23 mice that exhibit allele-dependent reductions in GnRH neuron number. Pulsatile LH secretion was evident at all stages of the estrous cycle, with LH pulse frequency being approximately one pulse per hour in metestrous, diestrous, and proestrous mice but much less frequent at estrus (less than one pulse per 4 h)...
December 2016: Endocrinology
https://www.readbyqxmd.com/read/27693546/an-acute-non-therapeutic-dose-of-methylphenidate-disrupts-partner-preference-in-female-rats
#19
Alexa Gomez, Alexandra N Petrucci, Lauren Dance, Jessica Morales-Valenzuela, Nicole Gibbs, Cara C Dahlhausen, Jessica R Villatoro, Russell F Frohardt, Fay A Guarraci
The present study was designed to test the effects of an acute, high dose of methylphenidate (MPH; trademarked as Ritalin) on sexual behavior in female Long-Evans rats. In Experiment 1, naturally cycling subjects in estrus were tested for partner preference 20min after receiving an i.p. injection of MPH 10mg/kg (n=8) or saline (n=7). During the partner-preference test, female subjects were given the choice to interact with a sexually active male stimulus or a sexually receptive female stimulus. Physical contact was limited by placing the stimulus animals behind a wire mesh during the no-contact phase of the test, whereas physical contact was not limited during the contact phase...
September 28, 2016: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/27687739/electroencephalographic-coupling-in-the-amygdala-and-prefrontal-cortex-in-relation-to-the-estrous-cycle-and-duration-of-vaginocervical-stimulation-in-the-rat
#20
Marisela Hernández-González, Orlando Reynoso-Orozco, Miguel Angel Guevara, Diego Radberto Chapa García Abascal, Anders Ågmo
The influence of the duration of vaginocervical stimulation (VCS) on the electroencephalographic activity (EEG) of medial amygdala (MeA) and prefrontal cortex (PFC) in rats during proestrus-estrus (P-E) and diestrus (D) was examined. Using a glass syringe plunger, a constant force of 300 g was exerted against the cervix during 60 s. Relative power (RP) and correlation of three EEG band frequencies were compared between the first and last 30 s intervals of VCS. A higher RP of the 4-7 Hz band and a lower RP of the fast frequencies were observed in the MeA and PFC in P-E females during the first 30 s of VCS as compared to the last 30 s...
September 26, 2016: Brain Research
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