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Sexual maturation

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https://www.readbyqxmd.com/read/28526326/effects-on-the-reproductive-system-of-young-male-rats-of-subcutaneous-exposure-to-n-butylparaben
#1
Tania Garcia, Elga Schreiber, Vikas Kumar, Raju Prasad, Juan J Sirvent, Jose L Domingo, Mercedes Gómez
This study was aimed at determining whether an in vivo subcutaneous exposure to n-butylparaben (n-ButP) during one complete spermatogenic cycle could be harmful to the reproductive system of young male rats. Animals were subcutaneously given 0, 150, 300 and 600 mg/kg/day of n-ButP with vehicle (peanut oil). Body and organ weights, n-ButP excretion, biochemical parameters, sperm and spermatid count, sperm motility, viability, maturity and morphology were examined. Results showed that after a completed spermatogenic cycle, although n-ButP did not induce dose-related changes in the different biochemical parameters, a significant decrease of triacylglicerides (TAG) -due to the vehicle-was found...
May 16, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28526032/multiplex-dnase-free-one-step-reverse-transcription-pcr-for-plasmodium-18s-rrna-and-spliced-gametocyte-specific-mrnas
#2
Amelia E Hanron, Zachary P Billman, Annette M Seilie, Tayla M Olsen, Matthew Fishbaugher, Ming Chang, Thomas Rueckle, Nicole Andenmatten, Bryan Greenhouse, Emmanuel Arinaitwe, John Rek, Smita Das, Gonzalo J Domingo, Kelly Shipman, Stefan H Kappe, James G Kublin, Sean C Murphy
BACKGROUND: Plasmodium gametocytes are sexual stages transmitted to female Anopheles mosquitoes. While Plasmodium parasites can be differentiated microscopically on Giemsa-stained blood smears, molecular methods are increasingly used because of their increased sensitivity. Molecular detection of gametocytes requires methods that discriminate between asexual and sexual stage parasites. Commonly tested gametocyte-specific mRNAs are pfs25 and pfs230 detected by reverse transcription polymerase chain reaction (RT-PCR)...
May 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28508614/methods-for-rating-sexual-development-in-girls
#3
Vincenzo De Sanctis, Ihab Zaki Elhakim, Ashraf T Soliman, Heba Elsedfy, Rania Elalaily, Giuseppe Millimaggi
Sexual maturity rating (SMR) is important in population studies and in clinical care. Pubertal staging allows doctors to assess the maturation of adolescents to correlate several pubertal phenomena such as age at menarche, growth spurt and final height, to advise and manage patients appropriately and to have sensitive "sensors" of the effects of environmental exposure on human populations. The commonly used markers of the timing of female puberty are thelarche and menarche. Appearance of the breast bud is the first indicator of puberty onset in 90% of girls...
September 2016: Pediatric Endocrinology Reviews: PER
https://www.readbyqxmd.com/read/28502874/aerobic-vaginitis-no-longer-a-stranger
#4
Gilbert G G Donders, Gert Bellen, Svitrigaile Grinceviciene, Kateryna Ruban, Pedro Vieira-Baptista
Aerobic vaginitis (AV) is the name given in 2002 to a vaginal infectious entity which was not recognized as such before. It is characterized by abnormal (dysbiotic) vaginal microflora containing aerobic, enteric bacteria, variable levels of vaginal inflammation and deficient epithelial maturation. Although AV and bacterial vaginosis (BV) share some characteristics, such as a diminished number or absence of lactobacilli, increased discharge (fishy smelling in BV, while in severe forms of AV, a foul, rather rotten smell may be present) and increased pH (often more pronounced in AV), there are also striking differences between the two...
May 11, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28498997/initiation-of-gametocytogenesis-at-very-low-parasite-density-in-plasmodium-falciparum-infection
#5
Ryan Farid, Matthew W Dixon, Leann Tilley, James S McCarthy
The recent focus on the elimination of malaria has led to an increased interest in the role of sexual stages in its transmission. We introduce Plasmodium falciparum gametocyte exported protein-5 (PfGEXP5) transcript analysis as an important tool for evaluating the earliest (ring) stage sexual gametocytes in the blood of infected individuals. We show that gametocyte rings are detected in the peripheral blood immediately following establishment of asexual infections-without the need for triggers such as high-density asexual parasitemia or drug treatment...
April 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28494009/postnatal-changes-and-sexual-dimorphism-in-collagen-expression-in-mouse-skin
#6
Koji Y Arai, Takuya Hara, Toyofumi Nagatsuka, Chikako Kudo, Sho Tsuchiya, Yoshihiro Nomura, Toshio Nishiyama
To investigate sexual dimorphism and postnatal changes in skin collagen expression, mRNA levels of collagens and their regulatory factors in male and female skin were examined during the first 120 days of age by quantitative realtime PCR. Levels of mRNAs encoding extracellular matrices did not show any differences between male and female mice until day 15. Col1a1 and Col1a2 mRNAs noticeably increased at day 30 and remained at high levels until day 120 in male mice, while those in female mice remained at low levels during the period...
2017: PloS One
https://www.readbyqxmd.com/read/28490519/multiple-factors-influence-population-sex-ratios-in-the-mojave-desert-moss-syntrichia-caninervis
#7
Jenna T Baughman, Adam C Payton, Amber E Paasch, Kirsten M Fisher, Stuart F McDaniel
PREMISE OF RESEARCH: Natural populations of many mosses appear highly female-biased based on the presence of reproductive structures. This bias could be caused by increased male mortality, lower male growth rate, or a higher threshold for achieving sexual maturity in males. Here we test these hypotheses using samples from two populations of the Mojave Desert moss Syntrichia caninervis. METHODS: We used double-digest restriction-site associated DNA (RAD) sequencing to identify candidate sex-associated loci in a panel of sex-expressing plants...
May 10, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28488746/corpora-lutea-control-the-progression-of-small-antral-follicle-growth-in-the-pig-ovary
#8
Holly A LaVoie
The growth of activated ovarian primordial follicles into mature preovulatory follicles takes several months in sexually mature pigs. The penultimate growth period of small antral follicles, like the 0.5-mm diameter follicle shown on the upper right, occurs during the luteal phase of the estrous cycle. Small antral follicle growth is limited to 2-4 mm in diameter by the presence of functional corpora lutea, such as the one shown on the lower left. This article is protected by copyright. All rights reserved...
May 10, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28487778/cl-ii-malocclusion-treatment-using-the-modified-twin-block-appliance-coordinated-with-fixed-orthodontics-in-a-postmenarche-patient
#9
Amin Aminian, Shahriar Sarvareh Azimzadeh, Elina Rahmanian
Functional appliances have been used for treatment of Class II patients for a long time. The main objective of therapy with functional appliances is to induce supplementary lengthening of the mandible by stimulating increased growth at the condylar cartilage. The Twin Block appliance is one of the most commonly used functional appliances. The aim of this paper is to present a case report of mandibular deficiency treatment with Twin Block appliance in a female patient whose sexual maturation (one and a half years after menarche) and cervical vertebral maturation stage indicated the end of the growth peak...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28485098/production-of-a-fungal-furocoumarin-by-a-polyketide-synthase-gene-cluster-confers-the-chemo-resistance-of-neurospora-crassa-to-the-predation-by-fungivorous-arthropods
#10
Yanxia Zhao, Jianing Ding, Weihua Yuan, Jinjin Huang, Wenxiu Huang, Yan Wang, Weifa Zheng
The formation of sexual fruiting bodies and production of polyketides are believed to be the most important strategies for fungal survival in environmental insults. In Neurospora crassa, the backbone gene of polyketide synthase gene cluster 6 (pks-6), which is expressed at lower level under vegetative growth, is highly expressed during perithecia development. Intriguingly, deletion of pks-6 does not affect perithecia maturation. How the expression of pks-6 correlates with fungal sexual development remains to be established...
May 9, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28484129/expression-of-ayu-antimicrobial-peptide-genes-after-lps-stimulation
#11
Rehab Marray Nsrelden, Hiroyuki Horiuchi, Shuichi Furusawa
Plecoglossus altivelis (ayu) is one of the most important fish species in the Japanese islands and in internal fish hatcheries. Living in open aquatic environments exposes fish to many pathogens. Therefore, they require rapid and strong immune defenses. We investigated in vivo the direct association between the ayu innate immune response, represented by the relative transcription of genes encoding the cathelicidin and hepcidin antimicrobial peptides, and lipopolysaccharide (LPS), a conventional pathogen-associated molecular patterns (PAMPs) of Gram-negative bacteria...
May 7, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28481133/oral-1-generation-rat-reproduction-study-of-isobornyl-acetate-an-evaluation-through-sexual-maturity-in-the-f1-generation
#12
Valerie T Politano, Elise M Lewis, Alan M Hoberman, Robert M Diener, Anne Marie Api, Atish Patel
Reproductive toxicity of isobornyl acetate (IA), a widely used fragrance ingredient, was investigated in a 1-generation reproduction study in which 25 Crl: CD (Sprague-Dawley) rats/sex/group were gavaged with dosages of 0 (corn oil vehicle), 30, 100, or 300 mg/kg/d during premating, mating, gestation, and lactation. After weaning, 25 F1 generation pups/sex/dosage group were randomly selected for evaluation until sexual maturity. The following parameters were evaluated in P generation males and females: viability, clinical signs, body weights, feed consumption, mating and fertility, organ weights, gross and microscopic observations, sperm assessments (motility and concentration), natural delivery and litter observations, and ovarian follicle counts...
January 1, 2017: International Journal of Toxicology
https://www.readbyqxmd.com/read/28480144/transcriptome-assembly-and-candidate-genes-involved-in-nutritional-programming-in-the-swordtail-fish-xiphophorus-multilineatus
#13
Yuan Lu, Charlotte M Klimovich, Kalen Z Robeson, William Boswell, Oscar Ríos-Cardenas, Ronald B Walter, Molly R Morris
BACKGROUND: Nutritional programming takes place in early development. Variation in the quality and/or quantity of nutrients in early development can influence long-term health and viability. However, little is known about the mechanisms of nutritional programming. The live-bearing fish Xiphophorus multilineatus has the potential to be a new model for understanding these mechanisms, given prior evidence of nutritional programming influencing behavior and juvenile growth rate. We tested the hypotheses that nutritional programming would influence behaviors involved in energy homeostasis as well gene expression in X...
2017: PeerJ
https://www.readbyqxmd.com/read/28480132/osteology-of-galeamopus-pabsti-sp-nov-sauropoda-diplodocidae-with-implications-for-neurocentral-closure-timing-and-the-cervico-dorsal-transition-in-diplodocids
#14
Emanuel Tschopp, Octávio Mateus
Diplodocids are among the best known sauropod dinosaurs. Numerous specimens of currently 15 accepted species belonging to ten genera have been reported from the Late Jurassic to Early Cretaceous of North and South America, Europe, and Africa. The highest diversity is known from the Upper Jurassic Morrison Formation of the western United States: a recent review recognized 12 valid, named species, and possibly three additional, yet unnamed ones. One of these is herein described in detail and referred to the genus Galeamopus...
2017: PeerJ
https://www.readbyqxmd.com/read/28479084/the-presence-of-an-insulin-like-androgenic-gland-factor-iag-and-insulin-like-peptide-binding-protein-ilpbp-in-the-ovary-of-the-blue-crab-callinectes-sapidus-and-their-roles-in-ovarian-development
#15
Xiaoshuai Huang, Haihui Ye, J Sook Chung
Insulin-like androgenic gland factor (IAG) that is produced by the male androgenic gland (AG), plays a role in sexual differentiation and maintenance of male secondary sex characteristics in decapod crustaceans. With an earlier finding of IAG expression in a female Callinectes sapidus ovary, we aimed to examine a putative role of IAG during the ovarian development of this species. To this end, the full-length cDNA sequence of the ovarian CasIAG (termed CasIAG-ova) has been isolated. The predicted mature peptide sequence of CasIAG-ova is identical to that of the IAG from the AG, except in their signal peptide regions...
May 4, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28474560/redox-regulation-of-fertility-in-aging-male-and-the-role-of-antioxidants-a-savior-or-stressor
#16
Kristian Leisegang, Ralf Henkel, Ashok Agarwal
Oxidative stress (OS), an imbalance between reactive oxygen species (ROS) and antioxidant scavengers, is considered an important underlying mechanism associated with ageing, age-related chronic diseases and reproductive decline in males. However, OS is an important regulator of numerous molecular pathways essential for homeostasis within cells, tissues and systems. A fine balance between factors promoting OS and those that scavenge ROS is critically important. In the male reproductive tract and ejaculate, ROS are critical molecular players in essential reproductive processes, including spermatogenesis, epididymal transport, spermatozoa maturation and post-ejaculation processes such as motility, capacitation and the acrosome reaction...
October 19, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28472297/sexual-transmission-of-zikv-causes-fetal-growth-restriction-in-mice
#17
Ryuta Uraki, Kellie Ann Jurado, Jesse Hwang, Klara Szigeti-Buck, Tamas Horvath, Akiko Iwasaki, Erol Fikrig
Zika virus (ZIKV) can be transmitted via mosquito bite or sexual contact. Using mice that lack the type I interferon receptor we examine sexual transmission of ZIKV. Electron microscopy analyses showed association of virions with developing sperm within testes as well as with mature sperm within epididymis. When ZIKV-infected male mice were mated with naïve female mice, the weight of fetuses at embryonic day 18.5 (E18.5) was significantly reduced compared with the control group. Additionally, we found ocular deformities in a minority of the fetuses...
May 2, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28464929/the-development-of-sexual-stage-malaria-gametocytes-in-a-wave-bioreactor
#18
Corine G Demanga, Jenny W L Eng, Donald L Gardiner, Alison Roth, Alice Butterworth, John H Adams, Katharine R Trenholme, John P Dalton
BACKGROUND: Blocking malaria gametocyte development in RBCs or their fertilization in the mosquito gut can prevent infection of the mosquito vector and passage of disease to the human host. A 'transmission blocking' strategy is a component of future malaria control. However, the lack of robust culture systems for producing large amounts of Plasmodium falciparum gametocytes has limited our understanding of sexual-stage malaria biology and made vaccine or chemotherapeutic discoveries more difficult...
May 2, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28462047/the-genetics-of-venom-ontogeny-in-the-eastern-diamondback-rattlesnake-crotalus-adamanteus
#19
Darin R Rokyta, Mark J Margres, Micaiah J Ward, Elda E Sanchez
The same selective forces that give rise to rapid inter- and intraspecific divergence in snake venoms can also favor differences in venoms across life-history stages. Ontogenetic changes in venom composition are well known and widespread in snakes but have not been investigated to the level of unambiguously identifying the specific loci involved. The eastern diamondback rattlesnake was previously shown to undergo an ontogenetic shift in venom composition at sexual maturity, and this shift accounted for more venom variation than geography...
2017: PeerJ
https://www.readbyqxmd.com/read/28461070/suramin-inhibits-zika-virus-replication-by-interfering-with-virus-attachment-and-release-of-infectious-particles
#20
Irina C Albulescu, Kristina Kovacikova, Ali Tas, Eric J Snijder, Martijn J van Hemert
Zika virus (ZIKV) is a mosquito-borne flavivirus that mostly causes asymptomatic infections or mild disease characterized by low-grade fever, rash, conjunctivitis, and malaise. However, the recent massive ZIKV epidemics in the Americas have also linked ZIKV infection to fetal malformations like microcephaly and Guillain-Barré syndrome in adults, and have uncovered previously unrecognized routes of vertical and sexual transmission. Here we describe inhibition of ZIKV replication by suramin, originally an anti-parasitic drug, which was more recently shown to inhibit multiple viruses...
April 28, 2017: Antiviral Research
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