Relationship of gonadotropin-releasing hormone (GnRH) neurons to the olfactory system in developing lamprey (Petromyzon marinus)

The Journal of Comparative Neurology
S A TobetS A Sower

Abstract

Gonadotropin releasing-hormone (GnRH) regulates the hypothalamo-pituitary-gonadal axis in vertebrates. The regulation of GnRH is intimately related to information from the olfactory system. Additionally, GnRH neurons are thought to be derived from progenitor cells in medial olfactory placodes. The present experiments were conducted to characterize the earliest development of GnRH neurons in lamprey and to determine their relationship to cells and fibers derived from the olfactory system. Eggs from fertile adult sea lamprey were fertilized in the laboratory, and larvae were maintained for up to 100 days. GnRH neurons were visualized within the lamprey preoptic area and hypothalamus as soon as GnRH was detectable (22 days after fertilization). The number of neurons increased with age through day 100. GnRH neurons were never seen within the olfactory system. The cells and fibers of the olfactory system were identified using the lectin, Grifonia Simplicifolia-1 (GS-1). Overlap between the olfactory and GnRH systems were at the level of fiber projections. GS-1 reactive cells of apparent placodal origin did not enter the region of the preoptic area or hypothalamus that contained GnRH neurons. Recently divided cells were labeled with ...Continue Reading

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Citations

Jul 9, 2005·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Gerhard Schlosser
Dec 31, 2005·The Journal of Comparative Neurology·Begoña Villar-ChedaMaría Celina Rodicio
Jul 10, 2019·The Journal of Comparative Neurology·Philippe-Antoine BeauséjourRéjean Dubuc
Dec 24, 2005·Endocrinology·Stuart A Tobet, Gerald A Schwarting
Apr 16, 2002·The Journal of Comparative Neurology·Miguel Meléndez-FerroRamón Anadón
Aug 20, 2003·The Journal of Comparative Neurology·Andrea FrontiniBarbara S Zielinski
Apr 17, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Manuel A Pombal, Manuel Megías
Dec 23, 2020·Open Biology·Guillaume Poncelet, Sebastian M Shimeld
Dec 12, 2001·Molecular and Cellular Endocrinology·S A TobetG A Schwarting
Nov 1, 2005·General and Comparative Endocrinology·Pei-San Tsai
Jun 17, 2006·Molecular and Cellular Endocrinology·K E WhitlockS Twomey

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