Download or read book From precocious puberty to infertility metabolic control of the reproductive function written by Meenakshi Alreja and published by Frontiers E-books. This book was released on 2013-06-03 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existence of a fundamental link between nutrition and reproduction is well established. It is known for decades that a critical amount of stored energy is required for sexual maturation and maintenance of fertility. This concept is based on the idea that when survival is threatened by scarcity of food or increased energy demands, male and female of most species divert energy away from reproduction. This includes sexual maturation, the production of reproductive hormones and gametes, and the maintenance of pregnancy and lactation. If excessive leanness occurs in young women, puberty is often delayed. On the other hand, excess stored energy also negatively impacts fertility. Elevated adiposity aggravates polycystic ovarian syndrome, ovulatory dysfunctions and may induce hypothalamic hypogonadism in women. In obese men, fertility is usually decreased likely due to altered activity of the hypothalamus-pituitary axis and defective steroidogenesis in testis. Recently, studies have documented the link between the advance of obesity and the increasing rates of “precocious puberty”. In 1997, an epidemiologic study reported that 6.7% of American girls had clinical evidence of puberty at age 7 years, and 14.7% at age 8 years. That study described the youngest ever reported population age at puberty onset of 9.96 ± 1.82 years. In September of 2010, an alarming study showed that this phenomenon has been aggravated in the last decade. The authors found an increment of 5-8% in the number of girls with clinical evidence of puberty at age 7 and 8 years, compared to the 1997 study. They also reported a high correlation of early puberty onset and childhood obesity. These observations suggest the existence of a previously unrecognized deleterious effect of the increasing rates of childhood obesity: “the precocious puberty”, which will bring profound social and health implications for the next generations. Earlier menarche in girls is associated with increased risk of adult obesity, type 2 Diabetes and breast cancer. Thus, changing levels of key metabolic cues is an essential signal for the onset of puberty and maintenance of the tone of the reproductive system. As the activity of gonadotropin releasing hormone (GnRH) neurons is essential for the development and maturity of the reproductive axis, efforts have been made to identify the factors that directly regulate the activity of GnRH neurons. For example, sensory signals and metabolic cues (e.g. glucose) may reach the reproductive control sites of the central nervous system via sensory inputs conveyed by the vagus nerve or by direct action in the caudal brainstem. In addition, circulating metabolic factors such as leptin, insulin and ghrelin also inform the brain about the individual nutritional state. The goal of this Research Topic is to assemble multidisciplinary specialists to provide up-to-date reviews on the recent advances and achievements in the field.
Download or read book Thyroid Hormone in Brain and Brain Cells written by Frédéric Flamant and published by Frontiers Media SA. This book was released on 2016-01-21 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thyroid hormone signaling has been known for a long time to be required for proper neurodevelopment and the maintenance of cognitive functions in the adult brain. As thyroid hormone excess or deficiency is usually well handled by clinicians, research dedicated to the neural function of thyroid hormone, have not been a priority within the field. This is changing mainly for two reasons. First, new genetic diseases have been discovered, altering thyroid hormone signaling in brain (THRA, MCT8, SBP2), with neurodevelopmental consequences which are currently incurable. Second, there is a growing concern that exposition of the general population to environmental chemicals able to interfere with thyroid hormone signaling compromises children neurodevelopment or induces central disorders in adults. Finally thyroid hormone is acting directly on gene transcription, by binding nuclear receptors, and therefore is an interesting entry point to identify genetic programs controlling brain development and function. Reaching a broad understanding of the multiple processes involving thyroid hormone in brain is a tremendous task which will necessitate a multidisciplinary approach: animal genetics, molecular biology, brain imaging, developmental biology, genomics, etc... This topic will be the occasion to combine recent contributions in the field and to identify priorities for future investigations. Due to devastating consequences of congenital hypothyroidism, the neurodevelopmental consequences of altered thyroid hormone signaling have been extensively studied over the years. The discovery of new genetic diseases, the concern about the possible neurotoxicity of environmental thyroid hormone disruptors, recently renewed the interest for an important research field. This Ebook gathers reviews and original data from experts in various disciplines. It provides a broad view of ongoing research and outlines key issues for future investigation.
Download or read book Clinical Gynecology written by Eric J. Bieber and published by Cambridge University Press. This book was released on 2015-04-23 with total page 1127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written with the busy practice in mind, this book delivers clinically focused, evidence-based gynecology guidance in a quick-reference format. It explores etiology, screening, tests, diagnosis, and treatment for a full range of gynecologic health issues. The coverage includes the full range of gynecologic malignancies, reproductive endocrinology and infertility, infectious diseases, urogynecologic problems, gynecologic concerns in children and adolescents, and surgical interventions including minimally invasive surgical procedures. Information is easy to find and absorb owing to the extensive use of full-color diagrams, algorithms, and illustrations. The new edition has been expanded to include aspects of gynecology important in international and resource-poor settings.
Download or read book Leptin and Reproduction written by Michael C. Henson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The isolation of leptin in 1994 and its characterization as a factor influencing appetite, energy balance, and adiposity, immediately thrust the polypeptide into the rapidly growing body of literature centered on the physiology of obesity. The growing clinical awareness of obesity as a major health risk in developed societies dovetailed perfectly with any of a number of roles that leptin might play in this abenant physiological condition. Almost unnoticed amidst the excitement generated by early leptin publications was the suggestion that the "fat hormone" might also regulate a wide range of systems and events important to reproduction, including pubertal development, gonadal endocrinology, fettility, and pregnancy. Recognizing this potential, a relatively small cadre of researchers began to examine leptin specifically as a reproductive hormone, thus creating a new and fertile field of investigation. Interest in this area has since gained momentum and an increased number of participants have now made significant contributions to our understanding of many leptin-related mechanisms that are relevant to reproductive biology. Leptin and Reproduction is the first major volume to specifically address leptin as a reproductive hormone and closely examines the advances made in the short time since this field of interest developed. Preeminent researchers ti'om many of the subdisciplines working within this area present a welcomed compendium of the wealth of related literature and voice novel interpretations of cun'ent advances.
Download or read book Neuropeptide GPCRs in Neuroendocrinology Volume II written by Maria Lucia Narducci and published by Frontiers Media SA. This book was released on 2023-07-07 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Testis written by Henry G. Burger and published by . This book was released on 1981 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clinical Management of Male Infertility written by Giorgio Cavallini and published by Springer. This book was released on 2014-10-20 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides andrologists and other practitioners with reliable, up-to-date information on all aspects of male infertility and is designed to assist in the clinical management of patients. Clear guidance is offered on classification of infertility, sperm analysis interpretation and diagnosis. The full range of types and causes of male infertility are then discussed in depth. Particular attention is devoted to poorly understood conditions such as unexplained couple infertility and idiopathic male infertility, but the roles of diverse disorders, health and lifestyle factors and environmental pollution are also fully explored. Research considered stimulating for the reader is highlighted, reflecting the fascinating and controversial nature of the field. International treatment guidelines are presented and the role of diet and dietary supplements is discussed in view of their increasing importance. Clinicians will find that the book’s straightforward approach ensures that it can be easily and rapidly consulted.
Download or read book Research Awards Index written by and published by . This book was released on 1988 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Textbook of Clinical Embryology written by Eliezer Girsh and published by Cambridge University Press. This book was released on 2021-05-06 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personnel working in assisted reproductive technology often lack the opportunities for dedicated training in the specialized techniques and technologies required for the procedures. As such, success in the form of live birth rates can range from over 50% to less than 10% per treatment cycle. This comprehensive introductory textbook is an essential resource for trainee embryologists, medical students and nurses. The recent revolutions in biotechnology and molecular biology involved in delivering assisted reproductive services are thoroughly discussed. Basic knowledge such as the development and physiology of both male and female reproductive systems is covered, with practical aspects of IVF including gamete and embryo manipulation, cryopreservation and genetic testing explained in detail. A full description of the optimal structure and management of the IVF laboratory is given, helping ensure procedures are safe and effective. Extensive and highly detailed colour illustrations bring the content to life and aids readers in their understanding.
Download or read book Polycystic Ovary Syndrome written by Andrea Dunaif and published by Springer Science & Business Media. This book was released on 2008-01-12 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes the latest diagnostic criteria for PCOS and comprises the most up-to-date information about the genetic features and pathogenesis of PCOS. It critically reviews the methodological approaches and the evidence for various PCOS susceptibility genes. The book also discusses additional familial phenotypes of PCOS and their potential genetic basis. All four editors of this title are extremely prominent in the field of PCOS.
Download or read book Acute Care and Emergency Gynecology written by David Chelmow and published by Cambridge University Press. This book was released on 2014-10-30 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents almost 100 common and uncommon gynecologic problems encountered in urgent and emergency settings with an emphasis on practical management.
Download or read book Genetics of Human Infertility written by P.H. Vogt and published by Karger Medical and Scientific Publishers. This book was released on 2017-09-12 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infertility affects more than one in ten couples worldwide and is related to highly heterogeneous pathologies sometimes only discernible in the germ line. Its complex etiology often, but not always, includes genetic factors besides anatomical defects, immunological interference, and environmental aspects. Nearly 30% of infertility cases are probably caused only by genetic defects. Thereby experimental animal knockout models convincingly show that infertility can be caused by single or multiple gene defects. Translating those basic research findings into clinical studies is challenging, leaving genetic causes for the vast majority of infertility patients unexplained. Nevertheless, a large number of candidate genes have been revealed by sophisticated molecular methods. This book provides a comprehensive overview on the subject of infertility written by the leading authorities in this field. It covers topics including basic biological, cytological, and molecular studies, as well as common and uncommon syndromes. It is a must-read for human geneticists, endocrinologists, epidemiologists, zoologists, and counsellors in human genetics, infertility, and assisted reproduction.
Download or read book Textbook of Clinical Embryology written by Kevin Coward and published by Cambridge University Press. This book was released on 2013-10-31 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The success of Assisted Reproductive Technology is critically dependent upon the use of well optimized protocols, based upon sound scientific reasoning, empirical observations and evidence of clinical efficacy. Recently, the treatment of infertility has experienced a revolution, with the routine adoption of increasingly specialized molecular biological techniques and advanced methods for the manipulation of gametes and embryos. This textbook – inspired by the postgraduate degree program at the University of Oxford – guides students through the multidisciplinary syllabus essential to ART laboratory practice, from basic culture techniques and micromanipulation to laboratory management and quality assurance, and from endocrinology to molecular biology and research methods. Written for all levels of IVF practitioners, reproductive biologists and technologists involved in human reproductive science, it can be used as a reference manual for all IVF labs and as a textbook by undergraduates, advanced students, scientists and professionals involved in gamete, embryo or stem cell biology.
Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1970 with total page 1414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infertility and Impaired Fecundity in the United States 1982 2010 written by Anjani Chandra and published by . This book was released on 2013 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Porth Pathophysiology written by Charlotte Pooler and published by Lippincott Williams & Wilkins. This book was released on 2009-10-01 with total page 1638 pages. Available in PDF, EPUB and Kindle. Book excerpt: The well respected textbook Pathophysiology: Concepts of Altered Health States has now been fully adapted for Canadian undergraduate nursing and health professions students. Like the original text, this Canadian edition includes a review of anatomy and physiology and treatment information for commonly occurring disease states. Pediatric, geriatric, and pregnancy deviations are integrated throughout and highlighted with icons for easy identification. Canadian content includes Canadian healthcare statistics regarding incidence; cultural variations, with a focus on native population and largest immigrant populations; Canadian research and researchers; Canadian treatment protocols and guidelines; and commonly occurring disease concerns based on Canadian statistics.
Download or read book Knobil and Neill s Physiology of Reproduction written by and published by Academic Press. This book was released on 2005-12-12 with total page 3269 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3rd edition, the first new one in ten years, includes coverage of molecular levels of detail arising from the last decade's explosion of information at this level of organismic organization. There are 5 new Associate Editors and about 2/3 of the chapters have new authors. Chapters prepared by return authors are extensively revised. Several new chapters have been added on the topic of pregnancy, reflecting the vigorous investigation of this topic during the last decade.The information covered includes both human and experimental animals; basic principels are sought, and information at the organismic and molecular levels are presented.*The leading comprehensive work on the physiology of reproduction*Edited and authored by the world's leading scientists in the field*Is a synthesis of the molecular, cellular, and organismic levels of organization*Bibliogrpahics of chapters are extensive and cover all the relevant literature
