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https://www.readbyqxmd.com/read/28637324/the-effects-of-phytosterols-on-the-sexual-behavior-and-reproductive-function-in-the-japanese-quail-coturnix-coturnix-japonica
#1
Mohammad Ibrahim Qasimi, Kentaro Nagaoka, Gen Watanabe
Phytosterols (PS) are plant origin sterols naturally found in many foods and added as food additives. Since 1950, PS have attracted considerable attention due to their ability to lower serum cholesterol and inhibit cardiovascular disease (CVD). However, recent studies have found that PS act as endocrine-disrupting chemicals in laboratory animals. Therefore, this study was aimed at finding the mechanism(s) for PS effects on the sexual behaviors and reproductive functions in male Japanese quails (Coturnix coturnix japonica)...
June 16, 2017: Poultry Science
https://www.readbyqxmd.com/read/28630932/differential-intron-retention-in-jumonji-chromatin-modifier-genes-is-implicated-in-reptile-temperature-dependent-sex-determination
#2
Ira W Deveson, Clare E Holleley, James Blackburn, Jennifer A Marshall Graves, John S Mattick, Paul D Waters, Arthur Georges
In many vertebrates, sex of offspring is determined by external environmental cues rather than by sex chromosomes. In reptiles, for instance, temperature-dependent sex determination (TSD) is common. Despite decades of work, the mechanism by which temperature is converted into a sex-determining signal remains mysterious. This is partly because it is difficult to distinguish the primary molecular events of TSD from the confounding downstream signatures of sexual differentiation. We use the Australian central bearded dragon, in which chromosomal sex determination is overridden at high temperatures to produce sex-reversed female offspring, as a unique model to identify TSD-specific features of the transcriptome...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28629791/inositol-phosphate-signaling-as-mediator-for-growth-and-sexual-reproduction-in-podospora-anserina
#3
Ning Xie, Gwenaël Ruprich-Robert, Florence Chapeland-Leclerc, Evelyne Coppin, Hervé Lalucque, Sylvain Brun, Robert Debuchy, Philippe Silar
The molecular pathways involved in the development of multicellular fruiting bodies in fungi are still not well known. Especially, the interplay between the mycelium, the female tissues and the zygotic tissues of the fruiting bodies is poorly documented. Here, we describe PM154, a new strain of the model ascomycetes Podospora anserina able to mate with itself and that enabled the easy recovery of new mutants affected in fruiting body development. By complete genome sequencing of spod1, one of the new mutants, we identified an inositol phosphate polykinase gene as essential, especially for fruiting body development...
June 16, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28625191/attraction-and-consumption-of-methyl-eugenol-by-male-bactrocera-umbrosa-fabricius-diptera-tephritidae-promotes-conspecific-sexual-communication-and-mating-performance
#4
S L Wee, M Z Abdul Munir, A K W Hee
The Artocarpus fruit fly, Bactrocera umbrosa (Fabricius) (Diptera: Tephritidae), is an oligophagous fruit pest infesting Moraceae fruits, including jackfruit (Artocarpus heterophyllus Lamarck), a fruit commodity of high value in Malaysia. The scarcity of fundamental biological, physiological and ecological information on this pest, particularly in relation to behavioural response to phytochemical lures, which are instrumental to the success of many area-wide fruit fly control and management programmes, underpins the need for studies on this much-underrated pest...
June 19, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28623148/male-sexual-enhancement-after-methoprene-treatment-in-anastrepha-fraterculus-diptera-tephritidae-a-sustained-response-that-does-not-fade-away-after-sexual-maturation
#5
G E Bachmann, F Devescovi, A L Nussenbaum, J L Cladera, P C Fernández, M T Vera, P E A Teal, D F Segura
The juvenile hormone (JH) of insects triggers physiological changes related to reproduction in adults of both sexes. Methoprene is a sesquiterpene with some effects that are analogous to those of JH. Treatments with methoprene accelerate sexual maturation in males of the South American fruit fly Anastrepha fraterculus, giving young males a mating advantage over non-treated males of the same age. Here, we evaluated the effects of methoprene treatment on A. fraterculus males after the sexual maturation phase and tested whether this compound provides a long-term mating advantage...
June 13, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28622464/the-impact-of-drugs-on-male-fertility-a-review
#6
REVIEW
M Semet, M Paci, J Saïas-Magnan, C Metzler-Guillemain, R Boissier, H Lejeune, J Perrin
Beside cytotoxic drugs, other drugs can impact men's fertility through various mechanisms. Via the modification of the hypothalamic-pituitary-gonadal axis hormones or by non-hormonal mechanisms, drugs may directly and indirectly induce sexual dysfunction and spermatogenesis impairment and alteration of epididymal maturation. This systematic literature review summarizes existing data about the negative impact and associations of pharmacological treatments on male fertility (excluding cytotoxic drugs), with a view to making these data more readily available for medical staff...
June 16, 2017: Andrology
https://www.readbyqxmd.com/read/28619429/vitamin-d-and-multiple-sclerosis-an-update
#7
REVIEW
Charles Pierrot-Deseilligny, Jean-Claude Souberbielle
The most recent findings linking exposure to sun and vitamin D insufficiency to multiple sclerosis (MS) are reviewed. Due to insufficient sunshine and changing lifestyles, hypovitaminosis D is widespread in temperate countries. Numerous epidemiological studies have strongly suggested that sunshine and vitamin D insufficiency contributes to MS risk in these countries. Moreover, several large genetic studies in MS patients have recently stated unequivocally that diverse abnormalities involving vitamin D metabolism are related to the risk of the disease...
May 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28615280/age-associated-gene-expression-changes-in-the-arcuate-nucleus-of-male-rhesus-macaques
#8
Dominique Eghlidi, Vasilios Garyfallou, Steven Kohama, Henryk F Urbanski
The hypothalamic arcuate nucleus (ARC) represents a major component of the neuroendocrine reproductive axis, and plays an important role in controlling the onset of puberty as well as age-associated reproductive senescence. Although significant gene expression changes have been observed in the ARC during sexual maturation it is unclear what changes occur during aging, especially in males. Therefore, in the present study we profiled the expression of reproduction-related genes in the ARC of young and old male rhesus macaques, as well as old males that had received 6 months of hormone supplementation (HS) in the form of daily testosterone and dehydroepiandrosterone; we also compared morning versus night ARC gene expression in the old males...
June 14, 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/28610687/assessing-the-thickness-of-the-vaginal-wall-and-vaginal-mucosa-in-pre-menopausal-versus-post-menopausal-women-by-transabdominal-ultrasound-a-feasibility-study
#9
Adrian Balica, Daniella Wald-Spielman, Katherine Schertz, Susan Egan, Gloria Bachmann
OBJECTIVE: As life expectancy increases, the number of women reporting adverse genito-urinary symptoms (genitourinary syndrome of menopause; GSM) from menopause, including vaginal dryness and sexual pain, also will increase. Current objective measurements of vaginal atrophy such as maturation index require vaginal swabs and are invasive; at present, no minimally invasive measurements exist. The purpose of this study was to assess whether total vaginal wall thickness (TVT) and total vaginal mucosa thickness (TMT) as measured by transabdominal ultrasound could qualify as additional objective markers of vaginal wall thinning which could be related to menopausal status...
August 2017: Maturitas
https://www.readbyqxmd.com/read/28601939/n-pentacosane-acts-as-both-contact-and-volatile-pheromone-in-the-tea-weevil-myllocerinus-aurolineatus
#10
Xiaoling Sun, Xinzhong Zhang, Guangyuan Wu, Xiwang Li, Fenngjing Liu, Zhaojun Xin, Jin Zhang
Insect cuticular hydrocarbons (CHCs) play important roles in chemical communication, as well as having ecological and physiological roles. The use of CHCs for mate recognition has been shown in many insect genera, but little is known about their use in the tea weevil Myllocerinus aurolineatus. Here, we provide evidence that CHCs on the surface of sexually mature M. aurolineatus females act as contact sex pheromones, facilitating mate recognition and eliciting copulatory behavior in male weevils. Using gas chromatography-mass spectrometry, we identify n-pentacosane and n-heptacosane as two potential contact pheromone components...
June 10, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28596078/identification-of-an-oxytocinase-vasopressinase-like-leucyl-cystinyl-aminopeptidase-lnpep-in-teleost-fish-and-evidence-for-hypothalamic-mrna-expression-linked-to-behavioral-social-status
#11
Emma A Elkins, Kayla A Walti, Kathryn E Newberry, Sean C Lema
The vasotocin/vasopressin and isotocin/mesotocin/oxytocin family of nonapeptides regulate social behaviors and physiological functions associated with reproductive physiology and osmotic balance. While experimental and correlative studies provide evidence for these nonapeptides as modulators of behavior across all classes of vertebrates, mechanisms for nonapeptide inactivation in regulating these functions have been largely overlooked. Leucyl-cystinyl aminopeptidase (LNPEP) - also known as vasopressinase, oxytocinase, placental leucine aminopeptidase (P-LAP), and insulin-regulated aminopeptidase (IRAP) - is a membrane-bound zinc-dependent metalloexopeptidase enzyme that inactivates vasopressin, oxytocin, and select other cyclic polypeptides...
June 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28596011/emmenagogue-properties-of-milicia-excelsa-welw-c-c-berg-moraceae-based-at-least-in-part-on-its-ability-to-correlate-the-activity-of-the-hypothalamic-pituitary-axis-to-that-of-the-ovaries
#12
Marie Alfrede Mvondo, Aude Jaelle Touomo Sakock, Sylvin Benjamin Ateba, Charline Florence Awounfack, Telesphore Nanbo Gueyo, Dieudonné Njamen
ETHNOPHARMACOLOGICAL RELEVANCE: Milicia excelsa (Welw.) C.C. Berg (Moraceae) is a medicinal plant recommended over tropical Africa as a cure for several ailments including amenorrhea. This is the hallmark of an ovarian lesion or a dysfunction of the hypothalamic-pituitary-ovarian axis which may lead to infertility, osteoporosis or endometrial cancer. However, regardless these traditional claims, no scientific report dealing with emmenagogue properties has been reported yet. AIM OF THE STUDY: To bring scientific evidence to the curative action of the plant, we proposed evaluating the effects of a root aqueous extract of Milicia excelsa on female Wistar rat sexual maturation...
June 6, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28593614/circulating-anti-m%C3%A3-llerian-hormone-amh-associates-with-the-maturity-of-boys-drawings-does-amh-slow-cognitive-development-in-males
#13
Kirstie Morgan, Ted Ruffman, David K Bilkey, Ian S McLennan
PURPOSE: High levels of circulating anti-Müllerian hormone are unique to developing males, but the function of anti-Müllerian hormone in boys is unknown. In mice, anti-Müllerian hormone contributes to the male biases in the brain, but its receptors are present throughout non-sexually dimorphic portions of the brain. In humans, the speed of maturation is the most overt difference between girls and boys. We postulate that this is because anti-Müllerian hormone slows the maturation of the male human brain...
June 7, 2017: Endocrine
https://www.readbyqxmd.com/read/28591211/dispersal-strategies-in-the-highly-polygynous-ant-crematogaster-orthocrema-pygmaea-forel-formicidae-myrmicinae
#14
Rachid Hamidi, Jean-Christophe de Biseau, Thomas Bourguignon, Glauco Bezerra Martins Segundo, Matheus Torres Marinho Bezerril Fontenelle, Yves Quinet
In ants, dispersal strategies and morphology of female sexuals are generally linked to the mode of colony founding. In species using long-range dispersal tactics, queen/worker dimorphism is generally high and young queens are able to initiate new colonies by themselves, using their metabolic reserves. By contrast, in species using short-range dispersal strategies, queen/worker dimorphism is generally low and, due to their limited metabolic reserves, queens have lost the capacity to raise their brood alone and to found their colony independently...
2017: PloS One
https://www.readbyqxmd.com/read/28591136/breeding-chronology-and-social-interactions-affect-ungulate-foraging-behavior-at-a-concentrated-food-resource
#15
David B Stone, Michael J Cherry, James A Martin, Bradley S Cohen, Karl V Miller
Prey species must balance predator avoidance behavior with other essential activities including foraging, breeding, and social interactions. Anti-predator behaviors such as vigilance can impede resource acquisition rates by altering foraging behavior. However, in addition to predation risk, foraging behavior may also be affected by socio-sexual factors including breeding chronology and social interactions. Therefore, we investigated how time-of-day, distance-to-forest, group size, social interactions (presence of different sex-age class), and breeding chronology (pre-breeding, breeding, post-breeding seasons) affected probability of feeding (hereafter: feeding) for different sex and age-classes (mature males, immature males, adult females, and juveniles) of white-tailed deer at feed sites...
2017: PloS One
https://www.readbyqxmd.com/read/28591132/early-menarche-a-systematic-review-of-its-effect-on-sexual-and-reproductive-health-in-low-and-middle-income-countries
#16
Mobolaji Ibitoye, Cecilia Choi, Hina Tai, Grace Lee, Marni Sommer
BACKGROUND: Adolescent girls aged 15-19 bear a disproportionate burden of negative sexual and reproductive health outcomes in low- and middle-income countries. Research from several high-income countries suggests that early age at menarche is an important determinant of sexual and reproductive health. We conducted this systematic review to better understand whether and how early menarche is associated with various negative sexual and reproductive health outcomes in low- and middle-income countries and the implications of such associations...
2017: PloS One
https://www.readbyqxmd.com/read/28589316/androgen-induced-pseudo-hermaphroditic-phenotypes-in-female-brevimyrus-niger-g%C3%A3-nther-1866-teleostei-mormyridae
#17
Sonja K Stell, Peter Moller
This paper explores the plasticity of sexually dimorphic characters in subadult female Brevimyrus niger, an African weakly electric mormyrid species. Thirty-five fish were exposed in a staggered fashion (five fish a week) to aromatizable 17α-methyltestosterone over a period of 7 weeks; 18 fish served as untreated controls. 17α-MT induced precocious vitellogenesis that mirrored the natural maturational process during seasonal ovarian recrudescence. At the same time, 17α-MT exposure resulted in complete masculinization of the females' anal fin support structure normally observed during rainy season in adult males...
June 6, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28587594/construction-of-a-high-density-linkage-map-and-mapping-of-sex-determination-and-growth-related-loci-in-the-mandarin-fish-siniperca-chuatsi
#18
Chengfei Sun, Yongchaox Niu, Xing Ye, Junjian Dong, Wushu Hu, Qingkai Zeng, Zhihang Chen, Yuanyuan Tian, Jin Zhang, Maixin Lu
BACKGROUND: The mandarin fish (Siniperca chuatsi) is an important and widely cultured fish in China. However, the lack of selective breeding of mandarin fish in previous decades has resulted in a decline in the growth rate of pond-cultured fish, a shortened period of sexual maturity, and reduced disease resistance; these issues seriously affect the quality and safety of the fish products. Therefore, it is necessary to establish a selective breeding program for the mandarin fish to improve the economical traits of the fish and to sustain the development of the mandarin fish industry...
June 6, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28583212/lineage-specific-expansion-and-loss-of-tyrosinase-genes-across-platyhelminths-and-their-induction-profiles-in-the-carcinogenic-oriental-liver-fluke-clonorchis-sinensis
#19
Seon-Hee Kim, Young-An Bae
Tyrosinase provides an essential activity during egg production in diverse platyhelminths by mediating sclerotization of eggshells. In this study, we investigated the genomic and evolutionary features of tyrosinases in parasitic platyhelminths whose genomic information is available. A pair of paralogous tyrosinases was detected in most trematodes, whereas they were lost in cyclophyllidean cestodes. A pseudophyllidean cestode displaying egg biology similar to that of trematodes possessed an orthologous gene...
June 6, 2017: Parasitology
https://www.readbyqxmd.com/read/28580886/normal-developmental-and-estrous-cycle-dependent-histological-features-of-the-female-reproductive-organs-in-microminipigs
#20
Akihisa Kangawa, Masayoshi Otake, Satoko Enya, Toshinori Yoshida, Masatoshi Shibata
The microminipig has become an increasingly attractive animal model for various experimental practices because of its manageable size; however, studies of the histological features of the female reproductive organs in microminipigs are limited. The present study investigates the sexual development of the reproductive organs and the cyclical changes during the estrous cycle in female microminipigs. The ovaries, oviducts, uteri, and vaginal tissues from 33 animals aged 0 to 26 months were utilized in this study...
January 1, 2017: Toxicologic Pathology
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