Signal transduction in multifactorial neuroendocrine control of gonadotropin secretion and synthesis in teleosts-studies on the goldfish model.
In teleosts, gonadotropin (GTH) secretion and synthesis is controlled by multiple neuroendocrine factors from the hypothalamus, pituitary and peripheral sources. Pituitary gonadotropes must be able to differentiate and integrate information from these regulators at the cellular and intracellular level. In this article, the intracellular signal transduction mechanisms mediating the actions of some of these regulators, including GTH-releasing hormones, pituitary adenylate cyclase-activating polypeptide, dopamine, ghrelin, sex steroids, activin, and follistatin from experiments with goldfish are reviewed and discussed in relation with recent findings. Information from other teleost models is briefly compared. Goldfish gonadotropes possess multiple pharmacologically distinct intracellular Ca2+ stores that together with voltage-sensitive Ca2+ channels, Na+/H+ exchangers, protein kinase C, arachidonic acid, NO, protein kinase A, ERK/MAPK, and Smads allows for integrated control by different neuroendocrine factors.
Department of Biological Sciences, University of Alberta, CW405 Biological Sciences Building, Edmonton, Alberta, Canada T6G 2E9. john.chang@ualberta.ca
John P
JP
Chang
James D
JD
Johnson
Grant R
GR
Sawisky
Caleb L
CL
Grey
Gabriel
G
Mitchell
Morgan
M
Booth
Mark M
MM
Volk
Scott K
SK
Parks
Erin
E
Thompson
Greg G
GG
Goss
Christian
C
Klausen
Hamid R
HR
Habibi
D000818:Animals; D004298:Dopamine / Q000502:physiology; D005786:Gene Expression Regulation; D054439:Ghrelin / Q000502:physiology; D006054:Goldfish / Q000502:physiology; D012739:Gonadal Steroid Hormones / Q000502:physiology; D052681:Gonadotrophs / Q000187:drug effects / Q000502:physiology; D006062:Gonadotropins / Q000378:metabolism* / Q000502:physiology; D007986:Luteinizing Hormone / Q000096:biosynthesis; D008954:Models, Biological; D009478:Neuropeptide Y / Q000502:physiology; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide / Q000502:physiology; D010902:Pituitary Gland / Q000502:physiology; D015398:Signal Transduction
D054439:Ghrelin; D012739:Gonadal Steroid Hormones; D006062:Gonadotropins; D009478:Neuropeptide Y; D051219:Pituitary Adenylate Cyclase-Activating Polypeptide; C016844:salmon gonadotropin; D007986:Luteinizing Hormone; D004298:Dopamine