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https://www.readbyqxmd.com/read/28917264/expression-of-kisspeptin-protein-in-hypothalamus-and-lh-profile-of-growing-female-lambs
#1
Jolanta Polkowska, Anna Wójcik-Gładysz, Natalia Chmielewska, Marta Wańkowska
Kisspeptin (kp) is considered to be one of the major regulators of the induction of pubertal events via the activation of the gonadotrophin-releasing hormone-LH system. The aim of the present study was to analyse expression of immunoreactive (ir) kp in the hypothalamic neurons of female lambs from the neonatal to the peripubertal period (5 days to 32 weeks) in relation to the plasma LH pattern using immunohistochemistry and image analysis. Hypothalami were collected from female lambs (n=33) from the infantile, juvenile, prepubertal and peripubertal periods...
September 18, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28916209/towards-new-strategies-to-manage-livestock-reproduction-using-kisspeptin-analogs
#2
M Beltramo, C Decourt
The discovery of the hypothalamic neuropeptide kisspeptin and its receptor (KISS1R) have dramatically improved our knowledge about the central mechanisms controlling reproduction. Kisspeptin neurons could be considered the hub where internal and external information controlling reproduction converge. The information is here elaborated and the command dispatched to GnRH neurons, the final output of the brain system controlling reproduction. Several studies have shown that in mammals administration of kisspeptin could finely modulate many aspects of reproduction from puberty to ovulation...
September 12, 2017: Theriogenology
https://www.readbyqxmd.com/read/28911133/kisspeptin-is-a-novel-regulator-of-human-fetal-adrenocortical-development-and-function-a-finding-with-important-implications-for-the-human-fetoplacental-unit
#3
Harshini Katugampola, Peter J King, Sumana Chatterjee, Muriel Meso, Andrew J Duncan, John C Achermann, Leo Guasti, Lea Ghataore, Norman F Taylor, Rebecca Allen, Shemoon Marlene, Joseph Aquilina, Ali Abbara, Channa N Jaysena, Waljit S Dhillo, Leo Dunkel, Ulla Sankilampi, Helen L Storr
Context: The human fetal adrenal (HFA) is an integral component of the fetoplacental unit and important for the maintenance of pregnancy. Low kisspeptin levels during pregnancy are associated with miscarriage, and kisspeptin and its receptor are expressed in the HFA. However, the role of kisspeptin in fetal adrenal function remains unknown. Objective: To determine the role of kisspeptin in the developing HFA. Design: Experiments using H295R and primary HFA cells as in vitro models of the fetal adrenal...
September 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28903474/nitric-oxide-heat-shock-protein-axis-in-menopausal-hot-flushes-neglected-metabolic-issues-of-chronic-inflammatory-diseases-associated-with-deranged-heat-shock-response
#4
Antônio Azambuja Miragem, Paulo Ivo Homem de Bittencourt
BACKGROUND: Although some unequivocal underlying mechanisms of menopausal hot flushes have been demonstrated in animal models, the paucity of similar approaches in humans impedes further mechanistic outcomes. Human studies might show some as yet unexpected physiological mechanisms of metabolic adaptation that permeate the phase of decreased oestrogen levels in both symptomatic and asymptomatic women. This is particularly relevant because both the severity and time span of hot flushes are associated with increased risk of chronic inflammatory disease...
September 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28878091/kisspeptin-regulates-steroidogenesis-and-spermiation-in-anuran-amphibian
#5
Rosanna Chianese, Vincenza Ciaramella, Silvia Fasano, Riccardo Pierantoni, Rosaria Meccariello
Kisspeptin (Kp) system has a recognized role in the control of gonadotropic axis, at multiple levels. Recently, a major focus of research has been to assess any direct activity of this system on testis physiology. Using the amphibian anuran, Pelophylax esculentus, as animal model, we demonstrate - for the first time in non-mammalian vertebrate - that testis expresses both Kiss-1 and Gpr54 proteins during the annual sexual cycle and that ex vivo 17B-estradiol (E2, 10(-6) M) increases both proteins over control group...
October 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28875319/kisspeptin-expression-features-in-the-arcuate-and-anteroventral-periventricular-nuclei-of-hypothalamus-of-letrozole-induced-polycystic-ovarian-syndrome-in-rats
#6
Elham Aliabadi, Mohammad Reza Namavar, Keywan Mortezaee, Heidar Toolee, Sara Keshtgar, Hossein Mirkhani, Mohammad Akbari, Tayebeh Rastegar, Somayeh Solhjoo
PURPOSE: Polycystic ovary syndrome (PCOS) is the most common endocrine disorder of the reproductive system characterized by polycystic ovaries and androgen excess. Letrozole is a nonsteroidal aromatase inhibitor that is used in experimental research to induce PCOS. Kisspeptin is an essential protein in regulation of cyclicity. Kisspeptin receptor is expressed in the hypothalamus and pituitary glands, and kisspeptin containing neurons are affected from sex steroid hormones. We aimed to investigate the number of kisspeptin-positive cells in the arcuate (Arc) and anteroventral periventricular nuclei (AVPV) of hypothalamus in the letrozole-induced PCOS...
September 5, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28870491/the-effect-of-neonatal-immune-challenge-on-reproduction-by-altering-intraovarian-kisspeptin-gpr54-system-in-the-rat
#7
Bin-Qiao Wang, Yuan-Yuan Chen, Xiao-Xiao Lan, Zhi-Yang Zhou, Xin-Xin Xu, Xue-Qing Wu
Immune challenge in early life has been observed to influence the long-term reproductive dysfunction. On PNDs 3 and 5, female offsprings were administered with LPS (50μg/kg, i.p.) or saline. Vaginal opening was recorded, and oestrous cyclicity was monitored immediately post puberty and again at 56-70 days. At 10 weeks of age, the ovaries were removed for immunostaining and RNA analysis. Neonatal exposure to LPS resulted in a significant delay puberty onset as well as destroyed expression of ovulation related genes...
September 8, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28866668/emerging-roles-of-kisspeptin-in-sexual-and-emotional-brain-processing
#8
Alexander N Comninos, Waljit S Dhillo
<br>The emergence of kisspeptin as a crucial regulator of the hypothalamo-pituitary-gonadal (HPG) axis over the last 14 years has answered many questions as to the control of reproductive hormone secretion from the hypothalamus. More recently the role of kisspeptin outside the HPG axis has received increasing attention in the hope of delineating the pathways linking various sensory and social behaviours to reproduction. These studies, in a range of species from zebrafish to humans, have identified a role for kisspeptin in behavioural networks related to reproduction including olfaction, audition, fear, anxiety, mood and sexual arousal...
August 31, 2017: Neuroendocrinology
https://www.readbyqxmd.com/read/28863435/erratum-to-gonadotropin-releasing-hormone-kisspeptin-and-gonadal-steroids-directly-modulate-nucleobindin-2-nesfatin-1-in-murine-hypothalamic-gonadotropin-releasing-hormone-neurons-and-gonadotropes
#9
https://www.readbyqxmd.com/read/28863434/interaction-between-kisspeptin-and-adenylate-cyclase-activating-polypeptide-1-on-the-expression-of-pituitary-gonadotropin-subunits-a-study-using-mouse-pituitary-lbetat2-cells
#10
Tselmeg Mijiddorj, Haruhiko Kanasaki, Aki Oride, Tomomi Hara, Unurjargal Sukhbaatar, Tuvshintugs Tumurbaatar, Satoru Kyo
We examined direct effect of kisspeptin on pituitary gonadotrophs. Kisspeptin-10 (KP10) significantly increased the promoter activities of the gonadotropin subunits, common alpha-glycoprotein (Cga), luteinizing hormone beta (Lhb), and follicle-stimulatinghormone beta (Fshb) in LbetaT2 cells overexpressing kisspeptin receptor (Kiss1r). KP10 and gonadotropin-releasing hormone (GnRH) increased gonadotropin subunit levels to similar degrees and combined treatment with GnRH and KP10 did not potentiate their individual effects...
May 1, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28854728/a-second-dose-of-kisspeptin-54-improves-oocyte-maturation-in-women-at-high-risk-of-ovarian-hyperstimulation-syndrome-a-phase-2-randomized-controlled-trial
#11
Ali Abbara, Sophie Clarke, Rumana Islam, Julia K Prague, Alexander N Comninos, Shakunthala Narayanaswamy, Deborah Papadopoulou, Rachel Roberts, Chioma Izzi-Engbeaya, Risheka Ratnasabapathy, Alexander Nesbitt, Sunitha Vimalesvaran, Rehan Salim, Stuart A Lavery, Stephen R Bloom, Les Huson, Geoffrey H Trew, Waljit S Dhillo
STUDY QUESTION: Can increasing the duration of LH-exposure with a second dose of kisspeptin-54 improve oocyte maturation in women at high risk of ovarian hyperstimulation syndrome (OHSS)? SUMMARY ANSWER: A second dose of kisspeptin-54 at 10 h following the first improves oocyte yield in women at high risk of OHSS. WHAT IS KNOWN ALREADY: Kisspeptin acts at the hypothalamus to stimulate the release of an endogenous pool of GnRH from the hypothalamus...
September 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28846730/role-of-amygdala-kisspeptin-in-pubertal-timing-in-female-rats
#12
Daniel A Adekunbi, Xiao Feng Li, Shengyun Li, Olufeyi A Adegoke, Bolanle O Iranloye, Ayodele O Morakinyo, Stafford L Lightman, Paul D Taylor, Lucilla Poston, Kevin T O'Byrne
To investigate the mechanism by which maternal obesity disrupts reproductive function in offspring, we examined Kiss1 expression in the hypothalamic arcuate (ARC) and anteroventral periventricular (AVPV) nuclei, and posterodorsal medial amygdala (MePD) of pre-pubertal and young adult offspring. Sprague-Dawley rats were fed either a standard or energy-dense diet for six weeks prior to mating and throughout pregnancy and lactation. Male and female offspring were weaned onto normal diet on postnatal day (pnd) 21...
2017: PloS One
https://www.readbyqxmd.com/read/28845625/impact-of-carbohydrate-restriction-on-healthy-adolescent-development
#13
Hannah M Richmond, David M Duriancik
Carbohydrate-restricted diets are known for their impact on weight loss; however, research is still required to determine if low-carbohydrate diets are safe for adolescents. Carbohydrates directly stimulate an insulin response, and studies have recently shown that insulin and binding to respective insulin receptors (IRs) are critical in Kisspeptin (Kiss1) neuronal development. These neurons directly stimulate gonadotropin-releasing hormone, which activates the pituitary-gonadal axis during puberty. This information suggests that carbohydrate restriction may delay pubertal development in adolescents due to the impact on insulin and Kiss1 transcription...
September 2017: Pediatric Endocrinology Reviews: PER
https://www.readbyqxmd.com/read/28834570/differential-response-patterns-of-kisspeptin-and-rfrp-to-photoperiod-and-sex-steroid-feedback-in-the-djungarian-hamster-phodopus-sungorus
#14
K Rasri-Klosen, V Simonneaux, P Klosen
Many animals synchronize their reproductive activity with the seasons to optimize their offspring's survival. This synchronization involves switching on and off their gonadotropic axis. Ever since their discovery as key regulators of GnRH neurons, the hypothalamic RF-amide peptides kisspeptin and RFRP have been a major focus of research on the seasonal regulation of the gonadotropic axis. In this study we investigated the regulation of both neuropeptides in the Djungarian hamster, a major animal model for the study of seasonal reproduction...
August 23, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28830628/effect-of-kisspeptin-on-the-proliferation-and-apoptosis-of-bovine-granulosa-cells
#15
Hongyu Liu, Gaoqing Xu, Zhiyu Yuan, Yangyunyi Dong, Jun Wang, Wenfa Lu
Previous studies have shown that kisspeptin (Kp-10) is expressed in mammalian ovaries; however, the expression and role of Kp-10 in bovine ovarian granulosa cells are still unclear. In this study, we assessed the expression of Kp-10 and its effects on the proliferation and apoptosis of bovine granulosa cells. Immunohistochemical analysis showed that Kp-10 was expressed in the cytoplasm of bovine ovarian granulosa cells. Moreover, MTT assays showed that 100nM Kp-10 significantly inhibited the viability of granulosa cells (P<0...
October 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28822779/molecular-characterization-of-kiss2-and-differential-regulation-of-reproduction-related-genes-by-sex-steroids-in-the-hypothalamus-of-half-smooth-tongue-sole-cynoglossus-semilaevis
#16
Bin Wang, Quan Liu, Xuezhou Liu, Yongjiang Xu, Xuesong Song, Bao Shi
Kisspeptin (Kiss) plays a critical role in mediating gonadal steroid feedback to the gonadotropin-releasing hormone (GnRH) neurons in mammals. However, little information regarding the regulation of kisspeptin gene by sex steroids is available in teleosts. In this study, we examined the direct actions of estradiol (E2) and testosterone (T) on hypothalamic expression of kisspeptin and other key factors involved in reproductive function of half-smooth tongue sole. As a first step, a partial-length cDNA of kiss2 was identified from the brain of tongue sole and kiss2 transcript levels were shown to be widely expressed in various tissues, notably in the ovary...
August 16, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28822774/effects-of-neuropeptides-and-sex-steroids-on-the-pituitary-gonadal-axis-of-pre-pubertal-f1-wreckfish-h%C3%A4-puku-polyprion-oxygeneios-in-vivo-evidence-of-inhibitory-effects-of-androgens
#17
Matthew J Wylie, Alvin N Setiawan, Glen W Irvine, Jane E Symonds, Abigail Elizur, P Mark Lokman
The ability to advance puberty in broodstock that have a long generation interval and mature at large size is a highly valuable tool in contemporary aquaculture enterprise. Juvenile male and female wreckfish 'hāpuku' (Polyprion oxygeneios), a candidate for commercialization in aquaculture, were subjected to treatment for 8weeks with two implants, one containing steroid (blank; estradiol-17β, E2; 11-ketotestosterone, KT; 17 α-methyltestosterone, MT), the other peptide (blank; gonadotropin-releasing hormone analog, GnRHa; kisspeptin, Kiss2-12)...
August 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28814190/effects-of-neonatal-exposure-to-zearalenone-on-puberty-timing-hypothalamic-nuclei-of-avpv-and-arc-and-reproductive-functions-in-female-mice
#18
Rahmatollah Parandin, Morteza Behnam-Rassouli, Nasser Mahdavi-Shahri
It is now established that mycoestrogen zearalenone (ZEN) disrupts reproductive physiology, but the specific mechanisms by which this occurs remain unknown, especially in brain. Growing evidence suggests that populations of estradiol (E2)-sensitive neurons in anteroventral periventricular (AVPV) and arcuate (ARC) nuclei, especially kisspeptin neurons, play a pivotal role in the timing of puberty onset, ovulation, and normal reproduction. The present study was conducted to find whether the ZEN can cause estrogen-like actions during the critical period of neonatal differentiation...
September 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28808344/hypothalamic-effects-of-progesterone-on-regulation-of-the-pulsatile-and-surge-release-of-luteinising-hormone-in-female-rats
#19
Wen He, Xiaofeng Li, Daniel Adekunbi, Yali Liu, Hui Long, Li Wang, Qifeng Lyu, Yanping Kuang, Kevin T O'Byrne
Progesterone can block the oestradiol-induced GnRH/LH surge and inhibit LH pulse frequency. Recent studies reported that progesterone prevented premature LH surges during ovarian hyperstimulation in women. As the most potent stimulator of GnRH/LH release, kisspeptin is believed to mediate the positive and negative feedback effects of oestradiol in the hypothalamic anteroventral periventricular (AVPV) and arcuate (ARC) nuclei, while the region-specific role of progesterone receptors in these nuclei remains unknown...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805600/the-effect-of-oxytocin-and-kisspeptin-10-in-ovary-and-uterus-of-ischemia-reperfusion-injured-rats
#20
M Aslan, G Erkanli Senturk, H Akkaya, S Sahin, B Yılmaz
OBJECTIVE: Ischemia/reperfusion (I/R) injuries result in damage to endothelial and parenchymal cells. Oxytocin (OXY) stimulates uterine contraction during parturition and myoepithelial cells during suckling. OXY has been used as a protective antioxidant. Kisspeptin plays a key role in the central control of reproductive functions and onset of puberty. Recent studies show that these reproductive hormones have protective potential as antioxidant. The aim of this study is to investigate the potential protective effects of Kisspeptin and OXY as antioxidants on I/R injured ovary and uterus of female rats...
August 2017: Taiwanese Journal of Obstetrics & Gynecology
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