Chang John P, Johnson James D, Sawisky Grant R, Grey Caleb L, Mitchell Gabriel, Booth Morgan, Volk Mark M, Parks Scott K, Thompson Erin, Goss Greg G, Klausen Christian, Habibi Hamid R
Department of Biological Sciences, University of Alberta, CW405 Biological Sciences Building, Edmonton, Alberta, Canada T6G 2E9.
Gen Comp Endocrinol. 2009 Mar;161(1):42-52. doi: 10.1016/j.ygcen.2008.09.005. Epub 2008 Sep 21.
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.
