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Kisspeptin control of hypothalamus-pituitary-ovarian functions.
Vitam Horm
January 2025
Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, Uttar pradesh, India.
The discovery of Kisspeptin (Kiss) has opened a new direction in research on neuroendocrine control of reproduction in vertebrates. Belonging to the RF amide family of peptides, Kiss and its cognate receptor Gpr54 (Kissr) have a long and complex evolutionary history. Multiple forms of Kiss and Kissr are identified in non-mammalian vertebrates, with the exception of birds, and monotreme mammals.
View Article and Find Full Text PDFHypothalamic SIRT1-mediated regulation of the hormonal trigger of ovulation and its repression in energy deficit.
Metabolism
December 2024
Instituto Maimónides de Investigación Biomédica de Cordoba (IMIBIC), Department of Cell Biology, Physiology and Immunology, University of Cordoba; and Hospital Universitario Reina Sofia, Cordoba, Spain; CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain. Electronic address:
Female reproduction is highly sensitive to body energy stores; persistent energy deficit, as seen in anorexia or strenuous exercise, is known to suppress ovulation via ill-defined mechanisms. We report herein that hypothalamic SIRT1, a key component of the epigenetic machinery that links nutritional status and puberty onset via modulation of Kiss1, plays a critical role in the control of the preovulatory surge of gonadotropins, i.e.
View Article and Find Full Text PDFExpression of GnRH, Kisspeptin, and Their Specific Receptors in the Ovary and Uterus in Deslorelin-Treated Late-Prepubertal Bitches.
Vet Sci
November 2024
Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Dokuz Eylül University, İzmir 35890, Türkiye.
In this study, the expression and localization of gonadotropin-releasing hormone (GnRH1) and kisspeptin (KISS1) and their specific receptors in canine ovarian and uterine tissues were investigated after the application of deslorelin acetate (Suprelorin, 4.7 mg, Virbac, France) in the late prepubertal period. We hypothesized that prolonged treatment of prepubertal dogs with deslorelin would alter the expression of GnRH and kisspeptin genes in the uterus and ovaries.
View Article and Find Full Text PDFOvarian stimulation of Nelore calves and prepubertal heifers with a long-acting recombinant human FSH (corifollitropin-alpha) and subsequent ovum pick-up and in vitro embryo production outcomes.
Theriogenology
March 2025
Universidade de Brasília, Brasília, DF, 70910-900, Brazil; Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, 70770-901, Brazil. Electronic address:
The aim of this study was to evaluate the use of a long-acting recombinant human FSH (rhFSH, corifollitropin-alpha) to induce ovarian stimulation in Nelore breed (Bos indicus) calves and prepubertal heifers prior to ovum pick-up (OPU) for in vitro embryo production (IVEP). In Experiment 1, a dose-response trial was performed to determine the optimal dose of rhFSH, which was determined to be 10 μg. In Experiment 2, 6-7 mo old calves were randomly allocated to receive rhFSH either via sc (n = 5) or im (n = 5).
View Article and Find Full Text PDFGonadotropin therapy for mini-puberty induction in male infants with hypogonadotropic hypogonadism: a systematic review.
J Clin Endocrinol Metab
December 2024
Centre for Endocrinology, William Harvey Research Institute, Queen Mary University of London, London, UK.
Context: Congenital hypogonadotropic hypogonadism (CHH) is defined as an isolated deficiency of gonadotropin hormones. Mini-puberty, a transient postnatal activation of the hypothalamic-pituitary-gonadal axis in healthy infants, provides a window of opportunity to diagnose and treat CHH. Currently, in male infants with CHH, testosterone is used to increase phallus size.
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