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Gonadal failure

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https://www.readbyqxmd.com/read/28212592/novel-insights-into-gonadotropin-releasing-hormone-action-in-the-pituitary-gonadotrope
#1
Jessica L Brown, Mark Roberson
The hypothalamic-pituitary-gonadal axis controls reproduction via a series of hormones regulating gonadal function through interconnected feedback loops. Secretion of hypothalamic-derived gonadotropin-releasing hormone (GnRH) integrates inputs from higher brain centers to coordinate the activity of the pituitary gonadotrope and the biosynthesis and secretion of the gonadotropins which ultimately regulate gonadal function. Failure of GnRH to serve as the central integrator of this system has been associated with hypogonadotropic-hypogonadism and clinical infertility, while pharmacological application of GnRH analogs and gonadotropins have important implications of the treatment of such infertility...
February 17, 2017: Seminars in Reproductive Medicine
https://www.readbyqxmd.com/read/28193729/sequential-divergent-and-cooperative-requirements-of-foxl2a-and-foxl2b-in-ovary-development-and-maintenance-of-zebrafish
#2
Yan-Jing Yang, Yang Wang, Zhi Li, Li Zhou, Jian-Fang Gui
Foxl2 is essential for mammalian ovary maintenance. Although sexually dimorphic expression of foxl2 was observed in many teleost, its role and regulative mechanism in fish remained largely unclear. In this study, we first identified two transcript variants of foxl2a and its homologous gene foxl2b in zebrafish, and revealed their specific expression in follicular layer cells in a sequential and divergent fashion during ovary differentiation, maturation and maintenance. Then, homozygous foxl2a mutants (foxl2a(-/-)) and foxl2b mutants (foxl2b(-/-)) were constructed, and detailed comparisons, such as sex ratio, gonadal histological structure, transcriptome profiling and dynamic expression of gonadal development-related genes, were carried out...
February 13, 2017: Genetics
https://www.readbyqxmd.com/read/28178580/dual-hormone-stress-reactivity-predicts-downstream-war-zone-stress-evoked-ptsd
#3
Robert A Josephs, Adam R Cobb, Cynthia L Lancaster, Han-Joo Lee, Michael J Telch
BACKGROUND: The crucial role of the hypothalamic-pituitary-adrenal axis (HPA) in stress-related homeostasis suggests dysregulated HPA involvement in the pathogenesis of post-traumatic stress disorder (PTSD), yet most studies examining linkages between HPA axis measures and PTSD have yielded null findings. One untested explanation for this inconsistency is a failure to account for simultaneous adrenal and gonadal influence. Here we tested the singular and interactive effects of cortisol (CR) and testosterone (TR) reactivity as moderators of war-zone stress evoked PTSD emergence in the war-zone...
January 19, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28161937/gonadal-and-sexual-dysfunction-in-childhood-cancer-survivors
#4
Ju Young Yoon, Hyeon Jin Park, Hee Young Ju, Jong Hyung Yoon, Jin Soo Chung, Sang Hyun Hwang, Dong Ock Lee, Hye Young Shim, Byung-Kiu Park
Purpose: Few studies have addressed gonadal and sexual dysfunctions in childhood cancer survivors. We evaluated the prevalence rates and risk factors for gonadal failure among adolescent/young adult childhood cancer survivors and their sexual function. Materials and Methods: Subjects were childhood cancer survivors aged 15-29 years who had completed therapy more than two years ago. Demographic and medical characteristics were obtained from the patients' medical records...
January 25, 2017: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/28107452/mice-lacking-hbp1-function-are-viable-and-fertile
#5
Cassy M Spiller, Dagmar Wilhelm, David A Jans, Josephine Bowles, Peter Koopman
Fetal germ cell development is tightly regulated by the somatic cell environment, and is characterised by cell cycle states that differ between XY and XX gonads. In the testis, gonocytes enter G1/G0 arrest from 12.5 days post coitum (dpc) in mice and maintain cell cycle arrest until after birth. Failure to correctly maintain G1/G0 arrest can result in loss of germ cells or, conversely, germ cell tumours. High mobility group box containing transcription factor 1 (HBP1) is a transcription factor that was previously identified in fetal male germ cells at the time of embryonic cell cycle arrest...
2017: PloS One
https://www.readbyqxmd.com/read/28099131/turner-syndrome-and-pituitary-adenomas-a-case-report-and-review-of-literature
#6
Tiffany Yeh, Angela Ganan Soto, Jose Bernardo Quintos, Lisa Swartz Topor
BACKGROUND: Turner syndrome (TS) is the most common sex chromosome abnormality in females, typically associated with primary amenorrhea and premature ovarian failure due to gonadal dysgenesis. The association of TS with hypopituitarism is an uncommon finding. The objective of the study was to describe an adolescent with TS with hypergonadotropic hypogonadism and subsequent hypogonadotropic hypogonadism. CASE PRESENTATION: A 16-year-old female with primary amenorrhea was diagnosed with TS based on karyotype 45,XO...
February 1, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28074124/involvement-of-blood-mononuclear-cells-in-the-infertility-age-associated-diseases-and-cancer-treatment
#7
REVIEW
Antonin Bukovsky
Blood mononuclear cells consist of T cells and monocyte derived cells. Beside immunity, the blood mononuclear cells belong to the complex tissue control system (TCS), where they exhibit morphostatic function by stimulating proliferation of tissue stem cells followed by cellular differentiation, that is stopped after attaining the proper functional stage, which differs among various tissue types. Therefore, the term immune and morphostatic system (IMS) should be implied. The TCS-mediated morphostasis also consists of vascular pericytes controlled by autonomic innervation, which is regulating the quantity of distinct tissues in vivo...
December 26, 2016: World Journal of Stem Cells
https://www.readbyqxmd.com/read/28028909/regulation-of-injury-induced-ovarian-regeneration-by-activation-of-oogonial-stem-cells
#8
Piril Erler, Alexandra Sweeney, James R Monaghan
Some animals have the ability to generate large numbers of oocytes throughout life. This raises the question whether persistent adult germline stem cell populations drive continuous oogenesis and whether they are capable of mounting a regenerative response after injury. Here we demonstrate the presence of adult oogonial stem cells (OSCs) in the adult axolotl salamander ovary and show that ovarian injury induces OSC activation and functional regeneration of the ovaries to reproductive capability. Cells that have morphological similarities to germ cells were identified in the developing and adult ovaries via histological analysis...
January 2017: Stem Cells
https://www.readbyqxmd.com/read/27990249/sex-differences-in-sympathetic-innervation-and-browning-of-white-adipose-tissue-of-mice
#9
Sang-Nam Kim, Young-Suk Jung, Hyun-Jung Kwon, Je Kyung Seong, James G Granneman, Yun-Hee Lee
BACKGROUND: The higher prevalence of obesity-related metabolic disease in males suggests that female sex hormones provide protective mechanisms against the pathogenesis of metabolic syndrome. Because browning of white adipose tissue (WAT) is protective against obesity-related metabolic disease, we examined sex differences in β3-adrenergic remodeling of WAT in mice. METHODS: Effects of the β3-adrenergic receptor agonist CL316,243 (CL) on browning of white adipose tissue were investigated in male and female C57BL mice...
2016: Biology of Sex Differences
https://www.readbyqxmd.com/read/27936533/endocrinology-update-testicular-hypogonadism
#10
Joel J Heidelbaugh
Testicular hypogonadism, or androgen deficiency, is defined as a clinical condition resulting from failure of the testes to produce physiologic levels of testosterone and a normal number of spermatozoa because of disruption of the hypothalamic-pituitary-gonadal axis. Testosterone deficiency (TD) is defined as a serum level less than 300 ng/dL on a morning total testosterone test. It is estimated that more than one-third of men 45 years and older have testosterone deficiency. Associated symptoms include decreased libido, erectile dysfunction, decreased physical stamina and strength, depressed mood, fatigue, increased visceral adiposity, sleep disturbance, and/or poor concentration and memory...
December 2016: FP Essentials
https://www.readbyqxmd.com/read/27898696/regulation-of-gonad-morphogenesis-in-drosophila-melanogaster-by-btb-family-transcription-factors
#11
Diane Silva, Kenneth W Olsen, Magdalena N Bednarz, Andrew Droste, Christopher P Lenkeit, Edwin Chaharbakhshi, Emily R Temple-Wood, Jennifer C Jemc
During embryogenesis, primordial germ cells (PGCs) and somatic gonadal precursor cells (SGPs) migrate and coalesce to form the early gonad. A failure of the PGCs and SGPs to form a gonad with the proper architecture not only affects germ cell development, but can also lead to infertility. Therefore, it is critical to identify the molecular mechanisms that function within both the PGCs and SGPs to promote gonad morphogenesis. We have characterized the phenotypes of two genes, longitudinals lacking (lola) and ribbon (rib), that are required for the coalescence and compaction of the embryonic gonad in Drosophila melanogaster...
2016: PloS One
https://www.readbyqxmd.com/read/27770600/inf2-and-fhod-related-formins-promote-ovulation-in-the-somatic-gonad-of-c-elegans
#12
Anna Hegsted, Forrest A Wright, SarahBeth Votra, David Pruyne
Formins are regulators of actin filament dynamics. We demonstrate here that two formins, FHOD-1 and EXC-6, are important in the nematode Caenorhabditis elegans for ovulation, during which actomyosin contractions push a maturing oocyte from the gonad arm into a distensible bag-like organ, the spermatheca. EXC-6, a homolog of the disease-associated mammalian formin INF2, is highly expressed in the spermatheca, where it localizes to cell-cell junctions and to circumferential actin filament bundles. Loss of EXC-6 does not noticeably affect the organization the actin filament bundles, and causes only a very modest increase in the population of junction-associated actin filaments...
December 2016: Cytoskeleton
https://www.readbyqxmd.com/read/27753830/sy-03-3-overview-of-somatic-mutations-and-epigenetic-regulation-of-aldosterone-producing-adenoma-apa
#13
Satoshi Umemura
Primary aldosteronism (PA) is a heterogeneous group of disorders including both sporadic and familial forms (familial hyperaldosteronism type I, II and III). PA is the most frequent endocrine cause of secondary hypertension and associated with a higher rate of cardiovascular complications, compared with essential hypertension.Here I review the recent progress in understanding of the genetic and molecular mechanisms leading to autonomous aldosterone production in PA.Systematic screening detects primary aldosteronism in 5 to 10% of all patients with hypertension and in approximately 20% of patients with resistant hypertension...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27716277/array-cgh-diagnosis-in-ovarian-failure-identification-of-new-molecular-actors-for-ovarian-physiology
#14
Sylvie Jaillard, Linda Akloul, Marion Beaumont, Houda Hamdi-Roze, Christele Dubourg, Sylvie Odent, Solène Duros, Nathalie Dejucq-Rainsford, Marc-Antoine Belaud-Rotureau, Célia Ravel
BACKGROUND: Ovarian failure (OF) is considered premature if it occurs before the age of 40. This study investigates the genetic aetiology underlying OF in women under the age of 40 years. METHODS: We conducted an experimental prospective study performing all genome microarrays in 60 patients younger than 40 years presenting an OF revealed by a decrease of circulating Anti-Müllerian Hormone (AMH) and leading to an oocyte donation program. RESULTS: We identified nine significant copy number variations (CNVs) including candidate genes potentially implicated in reproductive function...
October 3, 2016: Journal of Ovarian Research
https://www.readbyqxmd.com/read/27697203/gonadotrope-tumors
#15
S L Asa, S Ezzat
Gonadotrope tumors arise from the gonadotropes of the adenohypophysis. These cells rarely give rise to hyperplasia, usually only in the setting of long-standing premature gonadal failure. In contrast, gonadotrope tumors represent one of the most frequent types of pituitary tumors. Despite their relatively common occurrence, the pathogenesis of gonadotrope tumors remains unknown. Effective nonsurgical therapies remain out of reach. We review the pituitary gonadotrope from the morphologic and functional perspectives to better understand its involvement as the cell of origin of a frequent type of pituitary tumor...
2016: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/27681884/induction-of-steroidogenic-cells-from-adult-stem-cells-and-pluripotent-stem-cells-review
#16
Takashi Yazawa, Yoshitaka Imamichi, Kaoru Miyamoto, Md Rafiqul Islam Khan, Junsuke Uwada, Akihiro Umezawa, Takanobu Taniguchi
Steroid hormones are mainly produced in adrenal glands and gonads. Because steroid hormones play vital roles in various physiological processes, replacement of deficient steroid hormones by hormone replacement therapy (HRT) is necessary for patients with adrenal and gonadal failure. In addition to HRT, tissue regeneration using stem cells is predicted to provide novel therapy. Among various stem cell types, mesenchymal stem cells can be differentiated into steroidogenic cells following ectopic expression of nuclear receptor (NR) 5A subfamily proteins, steroidogenic factor-1 (also known as adrenal 4 binding protein) and liver receptor homolog-1, with the aid of cAMP signaling...
November 30, 2016: Endocrine Journal
https://www.readbyqxmd.com/read/27650467/could-gonadal-and-adrenal-androgen-deficiencies-contribute-to-the-depressive-symptoms-in-men-with-systolic-heart-failure
#17
Katarzyna Kulej-Lyko, Jacek Majda, Stephan von Haehling, Wolfram Doehner, Monika Lopuszanska, Alicja Szklarska, Waldemar Banasiak, Stefan D Anker, Piotr Ponikowski, Ewa A Jankowska
BACKGROUND: Testosterone (TT) and dehydroepiandrosterone sulphate (DHEAS) are neurosteroids and their deficiencies constitute the hormone risk factors promoting the development of depression in elderly otherwise healthy men. We investigated the link between hypogonadism and depression in accordance with age and concomitant diseases in men with systolic HF using the novel scale previously dedicated for elderly population. METHODS: We analysed the prevalence of depression and severity of depressive symptoms in population of 226 men with systolic HF (40-80 years) compared to 379 healthy peers...
December 2016: Aging Male: the Official Journal of the International Society for the Study of the Aging Male
https://www.readbyqxmd.com/read/27647650/-andrologic-consequences-of-chronic-renal-failure-state-of-the-art-for-the-yearly-scientific-report-of-the-french-national-association-of-urology
#18
Y Neuzillet, R Thuret, F Kleinclauss, M-O Timsit
OBJECTIVE: To describe the state of the art of current knowledge regarding gonadal consequences of end-stage chronic kidney disease (CKD) and renal transplantation. MATERIAL AND METHOD: A systematic review of the literature search was performed from the databases Medline (NLM, Pubmed) and Embase, focused on the following keywords: "chronic kidney disease"; "chronic renal failure"; "hypogonadism"; "kidney transplantation"; "testicular dysfunction"; "testosterone"...
November 2016: Progrès en Urologie
https://www.readbyqxmd.com/read/27642883/sy-03-3-overview-of-somatic-mutations-and-epigenetic-regulation-of-aldosterone-producing-adenoma-apa
#19
Satoshi Umemura
Primary aldosteronism (PA) is a heterogeneous group of disorders including both sporadic and familial forms (familial hyperaldosteronism type I, II and III). PA is the most frequent endocrine cause of secondary hypertension and associated with a higher rate of cardiovascular complications, compared with essential hypertension.Here I review the recent progress in understanding of the genetic and molecular mechanisms leading to autonomous aldosterone production in PA.Systematic screening detects primary aldosteronism in 5 to 10% of all patients with hypertension and in approximately 20% of patients with resistant hypertension...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27637014/gonadal-function-is-associated-with-cardiometabolic-health-in-pre-pubertal-boys-with-klinefelter-syndrome
#20
S Davis, N Lahlou, M Bardsley, M-C Temple, K Kowal, L Pyle, P Zeitler, J Ross
The most common sex chromosome aneuploidy, Klinefelter syndrome (KS), is associated with primary gonadal failure and increased morbidity and mortality from cardiometabolic disorders in adulthood. Children with KS also have a high prevalence of metabolic syndrome (MetS) features. To assess the relationship of gonadal and cardiometabolic function in children with KS, we evaluated serum hormones [gonadotropins, inhibin B (INHB), anti-mullerian hormone (AMH), total testosterone (TT)], and features of MetS (waist circumference, fasting lipid panel, fasting blood glucose (FBG), and blood pressure) in 93 pre-pubertal boys with KS age 4-12 years (mean 7...
November 2016: Andrology
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