Read by QxMD icon Read

Estrus cycle

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
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
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 luteinizing hormone (LH) secretion i) throughout the mouse estrous cycle, ii) in ovariectomized mice, iii) in ovariectomized, estradiol-treated mice that model estrogen negative and positive feedback, and iv) 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 (<1 pulse/4h)...
October 7, 2016: Endocrinology
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
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
Kouichi Tanemura, Tadatoshi Ohtaki, Yasushi Kuwahara, Shigehisa Tsumagari
Uridine 5'-diphospho-glucuronosyltransferase (UGT) liver activity was measured using estradiol-17β as a substrate in dairy cows with follicular cysts. The activity was significantly lower than that in dairy cows with normal estrous cycles (P<0.01). Liver disorders, such as fatty liver and hepatitis, were observed in half cows with follicular cysts, and liver UGT activity was lower than that in cows with normal estrus cycles. In addition, the liver UGT activity was significantly lower in dairy cows with follicular cysts without liver disorders than in dairy cows with normal estrous cycles...
September 26, 2016: Journal of Veterinary Medical Science
Vaibhave Ubba, Upendra Kumar Soni, Sangappa Chadchan, Vineet Kumar Maurya, Vijay Kumar, Ruchika Maurya, Himanshu Chaturvedi, Rajender Singh, Anila Dwivedi, Rajesh Kumar Jha
The function of RHOG, a RAC1 activator, was explored in the ovary during ovarian follicular development and pathological conditions. With the help of immunoblotting and immunolocalization, we determined the expression and localization of RHOG in normal (estrous cycle) and polycystic ovaries using Sprague Dawley (SD) rat model. Employing polymerase chain reaction and flow cytometry, we analyzed the transcript and expression levels of downstream molecules of RHOG, DOCK1, and RAC1 in the polycystic ovarian syndrome (PCOS) ovary along with normal antral follicular theca and granulosa cells after dehydroepiandrosterone (DHEA) supplementation...
September 22, 2016: Reproductive Sciences
P M Bartlewski, J Sohal, V Paravinja, T Baby, M E F Oliveira, M Murawski, T Schwarz, D A Zieba, D H Keisler
Ovarian antral follicles in the ewe grow in an orderly succession, producing 3 to 4 waves per estrous cycle. In prolific sheep, some large antral follicles from the second-to-last wave of the estrous cycle are added to the ovulatory follicles emerging just before estrus to give a higher ovulation rate; it is feasible that regression of these follicles is prevented by an increase in serum concentrations of FSH or LH pulsatility at proestrus. Prolific sheep tend to have a shorter luteal phase than nonprolific ewes and there is a great deal of evidence that luteal progesterone (P4), in addition to regulating LH release, may govern the secretion of FSH heralding the emergence of follicular waves...
June 29, 2016: Domestic Animal Endocrinology
Manish Putteeraj, Tomoko Soga, Takayoshi Ubuka, Ishwar S Parhar
Reproduction is associated with the circadian system, primarily as a result of the connectivity between the biological clock in the suprachiasmatic nucleus (SCN) and reproduction-regulating brain regions, such as preoptic area (POA), anteroventral periventricular nucleus (AVPV), and arcuate nucleus (ARC). Networking of the central pacemaker to these hypothalamic brain regions is partly represented by close fiber appositions to specialized neurons, such as kisspeptin and gonadotropin-releasing hormone (GnRH) neurons; accounting for rhythmic release of gonadotropins and sex steroids...
2016: Frontiers in Endocrinology
Olivia L Amundson, Erin L Larimore, Anthony K McNeel, Chad C Chase, Robert A Cushman, Harvey C Freetly, George A Perry
Diets high in protein are associated with lower reproductive performance and changes in the uterine environment. The objective of this study was to determine the effect of elevated systemic concentrations of urea nitrogen on the uterine environment and pregnancy success in beef heifers. Heifers (n=150) were matched by breed, age, and body weight then randomly assigned to one of two dietary treatments: 1) Control (10% CP) or 2) High protein (14% CP) over three replicates (n=40/replicate). Estrus was synchronized with an injection of PGF2α...
October 2016: Animal Reproduction Science
Shaihla A Khan, Brian S Edwards, Aaron Muth, Paul R Thompson, Brian D Cherrington, Amy M Navratil
Peptidylarginine deiminase (PAD) enzymes convert histone tail arginine residues to citrulline resulting in chromatin decondensation. Our previous work found that PAD isoforms are expressed in female reproductive tissues in an estrous cycle-dependent fashion, but their role in the anterior pituitary gland is unknown. Thus, we investigated PAD expression and function in gonadotrope cells. The gonadotrope-derived LβT2 cell line strongly expresses PAD2 at the protein level compared with other PAD isoforms. Consistent with this, PAD2 protein expression is highest during the estrous phase of the estrous cycle and colocalizes with the LH β-subunit in the mouse pituitary...
October 2016: Molecular Endocrinology
Bartosz Pawliński, Małgorzata Domino, Olga Aniołek, Adam Ziecik, Zdzislaw Gajewski
It is widely accepted that uterine contraction is initiated by spontaneous generation of electrical activity at a cellular level in the form of action potentials. Such action potential events, when they involve many myometrial cells and occur in immediate succession, are described by their amplitude and duration. In an effort to improve clinical management of uterine contractions, research has focused on determination of the properties of the reproductive tract's electrical activity under hormonal stimulation...
August 4, 2016: Theriogenology
Sukanya Leethongdee, Muhammad Khalid, Rex J Scaramuzzi
During the periovulatory period, the cervix relaxes in response to changes in circulating concentrations of reproductive hormones. The present study investigated the role of gonadotrophins in cervical function by examining the expression of cyclooxygenase-2 (COX2) and COX2 mRNA and the concentration of hyaluronan (HA) in the cervix, after intracervical treatment with either FSH or LH. Eighteen ewes were assigned to four groups. They were then treated with commercial intravaginal progestagen sponges and eCG to synchronize their estrous cycles...
July 25, 2016: Theriogenology
R Käser, R M Bruckmaier, S Thomas, H Sieme, C Wedekind, D Burger
Oxytocin is a hormone that may not only influence reproductive mechanisms in mammals but also their social behavior, including pair bonding. We therefore tested if the concentrations of oxytocin and other hormones reveal mate preferences of 13 mares in estrus. Each mare was first exposed to two stallions (haphazardly selected out of seven) and her behavior recorded. The mare was then returned to her box (i.e., no contact to stallions during that time). Approximately 4.5 hours later, venous blood samples were collected every minute during 30 minutes preceding exposure to one of the two previously used stallions, 6 minutes during exposure, and 30 minutes after exposure back in the mare's box...
July 25, 2016: Theriogenology
Hyopil Kim, Junehee Son, Hyoungseob Yoo, Hakyoo Kim, Jihae Oh, DaeHee Han, Yoon Hwang, Bong-Kiun Kaang
A primary characteristic of autism, which is a neurodevelopmental disorder, is impaired social interaction and communication. Furthermore, patients with autism frequently show abnormal social recognition. In mouse models of autism, social recognition is usually assessed by examining same-sex social behavior using various tests, such as the three-chamber test. However, no studies have examined the ability of male mice with autism to recognize the estrous cycle of female partners. In this study, we investigated the sexual behaviors, especially mounting and ultrasonic vocal communication (USV), of BTBR T+ tf/J (BTBR) mice, which are used as a well-known mouse model of autism, when they encountered estrus or diestrus female mice...
August 2016: Experimental Neurobiology
Mohamed Ali, Zeitoun Moustafa M
AIMS: This study aimed at elucidating the effects of recombinant human follicle stimulating hormone (r-hFSH) on the ovarian follicular dynamics, progesterone, estradiol-17β profiles, and pregnancy of dairy cows. MATERIALS AND METHODS: Three groups (G, n=5 cows) of multiparous dairy cows were used. G1 (C) control cows were given controlled internal drug release (CIDR) and prostaglandin F2α; G2 (L) cows were given low dose (525 IU and G3 (H) cows were given high dose (1800 IU) of r-hFSH on twice daily basis at the last 3 days before CIDR removal...
July 2016: Veterinary World
So-Hye Hong, Jae-Eon Lee, Hong Sung Kim, Young-Jin Jung, DaeYoun Hwang, Jae Ho Lee, Seung Yun Yang, Seung-Chul Kim, Seong-Keun Cho, Beum-Soo An
1,25-dihydroxyvitamin D3 (VD3), an active form of Vitamin D, is photosynthesized in the skin of vertebrates in response to solar ultraviolet B radiation (UV-B). VD3 deficiency can cause health problems such as immune disease, metabolic disease, and bone disorders. It has also been demonstrated that VD3 is involved in reproductive functions. Female sex hormones such as estrogen and progesterone are biosynthesized mainly in ovarian granulosa cells as the ovarian follicle develops. The functions of sex hormones include regulation of the estrus cycle and puberty as well as maintenance of pregnancy in females...
May 2016: Journal of Biomedical Research
Firouzeh Dehghan, Rahman Soori, Parvin Dehghan, Khadijeh Gholami, Sekaran Muniandy, Mohammad Ali Azarbayjani, Ashril Yusof
The changes in knee laxity and relaxin receptor expression at different phases of rodent estrous cycle are not known. Here, changes in the parameter were investigated in rats at different phases of the estrous cycle. Estrous cycle phases of intact female rats were determined by cytological examination of the vaginal smear. Following phase identification, blood was collected for serum hormone analyses. Knee passive range of motion (ROM) was determined by using a digital miniature goniometer. The animals were then sacrificed and patellar tendon, collateral ligaments and hamstring muscles were harvested for relaxin/insulin-like family peptide receptor 1 and 2 (RXFP1/RXFP2) analyses...
2016: PloS One
Marziyeh Salehi Jahromi, Fahimeh Ramezani Tehrani, Mahsa Noroozzadeh, Maryam Zarkesh, Asghar Ghasemi, Azita Zadeh-Vakili
It is believed that excess androgen exposure of the fetus, via altered gene expression, causes hyperandrogenism a key feature of polycystic ovary syndrome (PCOS). The aim of this study was to evaluate expression of Cytochrome P450-17 (CYP17), GATA-binding protein (GAGT6) and Steroidogenic acute regulatory protein (StAR), genes of adult female rats prenatally exposed to androgen excess, closely reflect endocrine and ovarian disturbances of PCOS in women, by comparing them during different phases of estrus cycle with those of non-treated rats...
November 15, 2016: Gene
Dennis R Müller, Sebastian T Soukup, Anne Kurrat, Xin Liu, Marion Schmicke, Ming-Yong Xie, Sabine E Kulling, Patrick Diel
There is increasing concern about possible adverse effects of soy based infant formulas (SBIF) due to their high amount of isoflavones (ISO). The aim of the present study was to investigate effects of neonatal exposure to ISO on reproductive system of female Wistar rats. Animals were exposed to an ISO depleted diet or a diet enriched with an ISO extract (IRD; 508mg ISO/kg) during embryogenesis and adolescence. Pups of each group were fed daily by pipette with ISO-suspension (ISO+; 32mg ISO/kg bw) or placebo from postnatal day (PND) 1 until PND23 resulting in plasma concentrations similar to levels reported in infants fed SBIF...
August 6, 2016: Toxicology Letters
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"