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https://www.readbyqxmd.com/read/28231067/the-association-of-peripubertal-serum-concentrations-of-organochlorine-chemicals-and-blood-lead-with-growth-and-pubertal-development-in-a-longitudinal-cohort-of-boys-a-review-of-published-results-from-the-russian-children-s-study
#1
Oleg Sergeyev, Jane S Burns, Paige L Williams, Susan A Korrick, Mary M Lee, Boris Revich, Russ Hauser
Organochlorine chemicals and lead are environmental exposures that have endocrine disrupting properties (EDCs) which interfere with many aspects of hormone action. Childhood and adolescence are windows of susceptibility for adverse health effects of EDCs. Our ongoing study, the Russian Children's Study (RCS), is one of the few longitudinal studies investigating the impact of EDCs on growth and puberty in boys. It is conducted in the historically contaminated city of Chapaevsk, in the Samara region. The study focuses on evaluating the associations of persistent organochlorine chemicals and lead with growth and pubertal timing...
February 23, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28229578/growth-and-pubertal-development-in-adolescent-male-wrestlers
#2
İbrahim E Pişkin, Mustafa Gümüş, Taner Bayraktaroğlu, Tevfik C Akalin, Faruk Yamaner
BACKGROUND: Adolescence is a crucial period for linear growth, and sports training during this time may have positive or negative effects on some physiological processes as growth. The purpose of this study was to evaluate the effects of intense training during somatic growth on the onset of puberty and growth development in adolescent wrestlers. METHODS: Fifty adolescent male wrestlers and twenty-one sedentary healthy male controls aged between 13-15 years were selected...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229107/translational-relevance-of-rodent-models-of-hypothalamic-pituitary-adrenal-function-and-stressors-in-adolescence
#3
REVIEW
Cheryl M McCormick, Matthew R Green, Jonathan J Simone
Elevations in glucocorticoids that result from environmental stressors can have programming effects on brain structure and function when the exposure occurs during sensitive periods that involve heightened neural development. In recent years, adolescence has gained increasing attention as another sensitive period of development, a period in which pubertal transitions may increase the vulnerability to stressors. There are similarities in physical and behavioural development between humans and rats, and rats have been used effectively as an animal model of adolescence and the unique plasticity of this period of ontogeny...
February 2017: Neurobiology of Stress
https://www.readbyqxmd.com/read/28225306/hydrocortisone-therapy-and-growth-trajectory-in-children-with-classical-congenital-adrenal-hyperplasia
#4
Carla Bizzarri, Nicola Improda, Chiara Maggioli, Donatella Capalbo, Silvia Roma, Ottavia Porzio, Mariacarolina Salerno, Marco Cappa
OBJECTIVE: Poor linear growth is one of the main concerns in children with congenital adrenal hyperplasia (CAH). We aimed to analyze factors affecting growth trajectory in children with classical CAH. METHODS: Clinical records of children followed from infancy up to the end of growth at two Italian tertiary referral hospitals were reviewed. Fifty-seven patients (31 males), treated with hydrocortisone and fludrocortisone only, were included. Clinical observations were divided into 3 groups: 0-2 years: 172 observations; from 2 years to puberty onset: 813 observations; after puberty onset: 527 observations...
February 22, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/28216130/amphiregulin-as-a-novel-serum-marker-of-puberty-in-girls
#5
Frank M Biro, Susan M Pinney, Richard C Schwartz, Bin Huang, Ashley M Cattran, Sandra Z Haslam
OBJECTIVES: Amphiregulin is a member of the epidermal growth factor family. In breast tissue, amphiregulin is a mediator of estrogen and progesterone signaling. The objectives were to examine the relationship of amphiregulin levels during peripuberty with estrogen levels. METHODS: The participants in this analysis were a subset from a longitudinal study of pubertal maturation, the Breast Cancer and the Environment Research Program. They were recruited between ages six and seven...
February 16, 2017: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/28215682/correlation-between-phenotype-genotype-and-antral-follicle-population-in-beef-heifers
#6
F Morotti, G M G Santos, C Koetz Júnior, K C Silva-Santos, V M Roso, M M Seneda
The present study was performed in indicus-taurus heifers 1) to determine if the antral follicle count (AFC) exhibits repeatability from puberty to yearling age and 2) to evaluate whether the phenotypic and genotypic parameters used in genetic improvement programs are correlated with AFC. In study I, Braford heifers (3/8 Nelore x 5/8 Hereford, n = 137) were serially examined by ultrasonography (with 60-day intervals) from weaning (9 ± 1 mo of age) to yearling ages (20 ± 1 mo of age) to monitor the numbers of antral follicles...
March 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/28215580/deviant-peers-as-a-mediator-of-pubertal-timing-substance-use-associations-the-moderating-role-of-parental-knowledge
#7
Kristine Marceau, Kristina Jackson
PURPOSE: Early perceived pubertal timing and faster maturation have been linked to increased risk of adolescent substance use (SU), particularly for girls, but the mechanisms underlying this association are not well understood. We sought to replicate and extend findings from Westling et al. (2008) showing that peer deviance mediates the link between early puberty and SU with stronger pathways in the context of low parental knowledge of adolescents' whereabouts and activities. METHODS: Participants (n = 1,023; 52% female, 24% nonwhite, and 12% Hispanic) were recruited through middle schools...
February 15, 2017: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
https://www.readbyqxmd.com/read/28215240/morningness-eveningness-correlates-with-sleep-time-quality-and-hygiene-in-secondary-school-students-a-multilevel-analysis
#8
Christian Vollmer, Konrad S Jankowski, Juan F Díaz-Morales, Heike Itzek-Greulich, Peter Wüst-Ackermann, Christoph Randler
At the onset of puberty, students shift their sleep to later hours, but school starts early. It is suggested that evening orientation and early school start times do not go well together. Therefore, the aim of this study was to investigate sleep problems in adolescence, and it was expected that the adolescents' eveningness orientation is associated with many sleep-related problems. Students of secondary education (n = 3201; mean = 13.8 ± 1.8 years) filled out a self-report questionnaire containing measures of morningness-eveningness, sleep time (midpoint of sleep, social "jetlag"), sleep length (on schooldays and on weekends), sleep quality, and sleep hygiene as well as questions on electronic screen media use...
February 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28211980/constitutional-bone-impairment-in-noonan-syndrome
#9
Giuseppina Baldassarre, Alessandro Mussa, Diana Carli, Cristina Molinatto, Giovanni Battista Ferrero
Noonan syndrome (NS) is an autosomal dominant trait characterized by genotypic and phenotypic variability. It belongs to the Ras/MAPK pathway disorders collectively named Rasopathies or neurocardiofaciocutaneous syndromes. Phenotype is characterized by short stature, congenital heart defects, facial dysmorphisms, skeletal and ectodermal anomalies, cryptorchidism, mild to moderate developmental delay/learning disability, and tumor predisposition. Short stature and skeletal dysmorphisms are almost constant and several studies hypothesized a role for the RAS pathway in regulating bone metabolism...
March 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28211649/insufficient-sleep-in-adolescents-causes-and-consequences
#10
Judith A Owens, Miriam R Weiss
Insufficient sleep poses an important and complicated set of health risks in the adolescent population. Not only is deficient sleep (defined as both sleep duration inadequate to meet sleep needs and sleep timing misaligned with the body's circadian rhythms) at epidemic levels in this population, but the contributing factors are both complex and numerous and there are a myriad of negative physical and mental health, safety and performance consequences. Causes of inadequate sleep identified in this population include internal biological processes such as the normal shift (delay) in circadian rhythm that occurs in association with puberty and a developmentally-based slowing of the "sleep drive", and external factors including extracurricular activities, excessive homework load, evening use of electronic media, caffeine intake and early school start times...
February 17, 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28211546/differential-effects-of-hormones-on-cellular-metabolism-in-keratoconus-in-vitro
#11
Tina B McKay, Jesper Hjortdal, Henrik Sejersen, Dimitrios Karamichos
Keratoconus (KC) is a corneal thinning disease with an onset commonly immediately post-puberty and stabilization by 40 to 50 years of age. The role of hormones in regulating corneal tissue structure in homeostatic and pathological conditions is unknown. Our group recently linked altered hormone levels to KC. Our current study sought to investigate and delineate the effects of exogenous hormones, such as androgen, luteotropin, and estrogen, on corneal stroma bioenergetics. We utilized our established 3D in vitro model to characterize the effects of DHEA, prolactin, 17β-estradiol on insulin-growth factor-1 and -2 (IGF-1, -2) signaling and metabolic function in primary corneal fibroblasts from healthy controls (HCFs) and KC patients (HKCs)...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210658/patellar-maltracking-persists-in-adolescent-females-with-patellofemoral-pain-a-longitudinal-study
#12
Victor R Carlson, Barry P Boden, Aricia Shen, Jennifer N Jackson, Katharine E Alter, Frances T Sheehan
BACKGROUND: Patellofemoral pain is one of the most common conditions seen in sports medicine practices, particularly among adolescent females. However, the natural history of the underlying pathology in patellofemoral pain during puberty remains poorly understood. PURPOSE: The purpose of this longitudinal study is to assess changes in patellar maltracking patterns in subjects with patellofemoral pain as they mature from mid- to late adolescence. STUDY DESIGN: Cohort study; Level of evidence, 3...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28209183/variants-in-congenital-hypogonadotrophic-hypogonadism-genes-identified-in-an-indonesian-cohort-of-46-xy-under-virilised-boys
#13
Katie L Ayers, Aurore Bouty, Gorjana Robevska, Jocelyn A van den Bergen, Achmad Zulfa Juniarto, Nurin Aisyiyah Listyasari, Andrew H Sinclair, Sultana M H Faradz
BACKGROUND: Congenital hypogonadotrophic hypogonadism (CHH) and Kallmann syndrome (KS) are caused by disruption to the hypothalamic-pituitary-gonadal (H-P-G) axis. In particular, reduced production, secretion or action of gonadotrophin-releasing hormone (GnRH) is often responsible. Various genes, many of which play a role in the development and function of the GnRH neurons, have been implicated in these disorders. Clinically, CHH and KS are heterogeneous; however, in 46,XY patients, they can be characterised by under-virilisation phenotypes such as cryptorchidism and micropenis or delayed puberty...
February 16, 2017: Human Genomics
https://www.readbyqxmd.com/read/28207416/are-aromatase-inhibitors-in-boys-with-predicted-short-stature-and-or-rapidly-advancing-bone-age-effective-and-safe
#14
Jessica A Ferris, Mitchell E Geffner
BACKGROUND: The aim of this study was to assess aromatase inhibitor (AI) efficacy in increasing predicted adult height (PAH) and to describe clinical and biochemical safety profiles of AI-treated boys. METHODS: A retrospective chart review was conducted at an academic children's hospital endocrinology clinic. Twenty-one boys with predicted short stature and/or rapidly advancing bone age, divided as Tanner stage (TS) I-III Group 1 (G1, n=9) and TS IV-V Group 2 (G2, n=12), were treated with AIs, either letrozole or anastrozole (mean duration, G1: 2...
February 16, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28203334/assessment-of-sexual-maturation-among-girls-with-special-needs-in-tehran-iran
#15
Hosein Shabani Mirzaee, Asieh Mosallanejad, Ali Rabbani, Aria Setoodeh, Farzaneh Abbasi, Fatemeh Sayarifard, Amir Hosein Memari
BACKGROUND: There is limited data on sexual maturation among girls with intellectual, sensory, or physical disabilities. OBJECTIVES: The present cross-sectional study was conducted to assess the sexual maturation of girls with these disabilities in special schools. METHODS: In this cross-sectional study, we evaluated the onset and progression of sexual maturation in 642 six to 18-year-old girls with intellectual, sensory, or physical disabilities from special schools in Tehran...
October 2016: Iranian Journal of Pediatrics
https://www.readbyqxmd.com/read/28196477/screening-and-evaluating-of-long-noncoding-rnas-in-the-puberty-of-goats
#16
Xiaoxiao Gao, Jing Ye, Chen Yang, Kaifa Zhang, Xiumei Li, Lei Luo, Jianping Ding, Yunsheng Li, Hongguo Cao, Yinghui Ling, Xiaorong Zhang, Ya Liu, Fugui Fang, Yunhai Zhang
BACKGROUND: Long noncoding RNAs (lncRNAs) are involved in regulating animal development, however, their function in the onset of puberty in goats remain largely unexplored. To identify the genes controlling the regulation of puberty in goats, we measured lncRNA and mRNA expression levels from the hypothalamus. RESULTS: We applied RNA sequencing analysis to examine the hypothalamus of pubertal (case; n = 3) and prepubertal (control; n = 3) goats. Our results showed 2943 predicted lncRNAs, including 2012 differentially expressed lncRNAs, which corresponded to 5412 target genes...
February 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28195504/postponement-of-puberty-in-queens-treated-with-deslorelin
#17
Marta Cecchetto, Paola Salata, Anna Baldan, Chiara Milani, Antonio Mollo, Christelle Fontaine, Hasan Sontas, Donatella Gelli, Giulia De Benedictis, Calogero Stelletta, Stefano Romagnoli
Objectives The purpose of this study was to assess efficacy of deslorelin, a gonadotropin-releasing hormone (GnRH) agonist marketed in Europe for the control of male dog reproduction, for the postponement of puberty in queens. Methods Nine prepubertal queens aged 3-9 months were selected for this study; their general and reproductive health was checked through clinical, haematological, vaginal cytology and hormonal tests. Following treatment with a 4.7 mg deslorelin implant each cat received a monthly clinical examination and blood was collected for hormonal assay every third month...
February 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28190662/prospective-ultrasonographic-and-endocrine-predictors-of-spermatogenic-onset-in-ram-lambs
#18
Pawel M Bartlewski, Jennifer L Giffin, Olutobi A Oluwole, Ann C Hahnel
The objective of this study was to examine testicular ultrasonographic characteristics and endocrine profiles in prepubescent ram lambs for correlations with the age at first detection of elongated spermatids (ESt age). Bi-weekly ultrasound examinations and weekly testicular biopsies began at 10 weeks of age or at the time that testicular volume reached 15cm(3), and continued until 1-2 weeks after Est's were first detected by histological examination of testicular biopsies in twenty-two spring-born Rideau Arcott×Polled Dorset lambs...
February 6, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28185630/management-of-nonparasitic-splenic-cysts-in-children-a-french-multicenter-review-of-100-cases
#19
Xavier Delforge, Yann Chaussy, Paula Borrego, Olivier Abbo, Frédérique Sauvat, Quentin Ballouhey, Sabine Irtan, Alexis Arnaud, Kassite Ibtissam, Nicoleta Panait, Gregory Rodesch, Henri Steyaert, Anne Schneider, Rémi Dubois, Sebastien Mesureur, Elodie Haraux, Philippe Buisson
BACKGROUND: The management of nonparasitic splenic cysts (NPSC) remains controversial. Surgical resection is indicated for symptomatic or complicated forms, but no guidelines are available for asymptomatic NPSC. The aims of this study were to evaluate the management of NPSC in French hospitals and to analyze the results of management. METHODS: We conducted a retrospective multicenter study from January 2004 to December 2014 in 16 university hospitals in France. Patients with a follow-up less than 6months were excluded...
January 31, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28183433/mechanisms-of-the-development-of-allergy-medall-introducing-novel-concepts-in-allergy-phenotypes
#20
REVIEW
Josep M Anto, Jean Bousquet, Mubeccel Akdis, Charles Auffray, Thomas Keil, Isabelle Momas, Dirkje S Postma, Rudolf Valenta, Magnus Wickman, Anne Cambon-Thomsen, Tari Haahtela, Bart N Lambrecht, Karin C Lodrup Carlsen, Gerard H Koppelman, Jordi Sunyer, Torsten Zuberbier, Isabelle Annesi-Maesano, Albert Arno, Carsten Bindslev-Jensen, Giuseppe De Carlo, Francesco Forastiere, Joachim Heinrich, Marek L Kowalski, Dieter Maier, Erik Melén, Henriette A Smit, Marie Standl, John Wright, Anna Asarnoj, Marta Benet, Natalia Ballardini, Judith Garcia-Aymerich, Ulrike Gehring, Stefano Guerra, Cynthia Hohmann, Inger Kull, Christian Lupinek, Mariona Pinart, Ingebjorg Skrindo, Marit Westman, Delphine Smagghe, Cezmi Akdis, Niklas Andersson, Claus Bachert, Stephane Ballereau, Ferran Ballester, Xavier Basagana, Anna Bedbrook, Anna Bergstrom, Andrea von Berg, Bert Brunekreef, Emilie Burte, Kai-Hakon Carlsen, Leda Chatzi, Jonathan M Coquet, Mirela Curin, Pascal Demoly, Esben Eller, Maria Pia Fantini, Leena von Hertzen, Vergard Hovland, Benedicte Jacquemin, Jocelyne Just, Theresa Keller, Renata Kiss, Manolis Kogevinas, Sibylle Koletzko, Susanne Lau, Irina Lehmann, Nicolas Lemonnier, Mika Mäkelä, Jordi Mestres, Peter Mowinckel, Rachel Nadif, Martijn C Nawijn, Johan Pellet, Isabelle Pin, Daniela Porta, Fanny Rancière, Emmanuelle Rial-Sebbag, Yvan Saeys, Martijn J Schuijs, Valerie Siroux, Christina G Tischer, Mathies Torrent, Raphaelle Varraso, Kalus Wenzel, Cheng-Jian Xu
Asthma, rhinitis, and eczema are complex diseases with multiple genetic and environmental factors interlinked through IgE-associated and non-IgE-associated mechanisms. Mechanisms of the Development of ALLergy (MeDALL; EU FP7-CP-IP; project no: 261357; 2010-2015) studied the complex links of allergic diseases at the clinical and mechanistic levels by linking epidemiologic, clinical, and mechanistic research, including in vivo and in vitro models. MeDALL integrated 14 European birth cohorts, including 44,010 participants and 160 cohort follow-ups between pregnancy and age 20 years...
February 2017: Journal of Allergy and Clinical Immunology
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