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• W2018644590 abstract "In the sheep, it has been shown that the pars tuberalis of the pituitary may mediate the photoperiodic control of seasonal changes in prolactin secretion. High concentrations of melatonin receptors are present on the ovine pars tuberalis and melatonin is known to inhibit forskolin-stimulated cyclic AMP production in this tissue. Other hormonal inputs to the ovine pars tuberalis have not yet been identified. In the rat mRNA for the IGF-I receptor has been identified in the pars tuberalis using in situ hybridization. In order to define whether IGF-I may influence the function of the ovine pars tuberalis the presence of receptors for IGF-I has been investigated. Using in vitro autoradiography specific [125I]IGF-I binding was found in high concentrations over the ovine pars tuberalis particularly associated with certain of the capillaries. Homogenate receptor assays showed saturable specific binding of [125I]IGF-I with a mean dissociation constant (Kd) of 0.5 ± 0.1 nM (n=4). Competition studies revealed a rank order of potency of IGF-I>IGF-II> > >insulin, in displacing [125I]IGF-I binding, indicative of a mixed population of IGF-I and IGF-II/rnannose-6-phosphate receptors and insulin-like growth factor binding proteins (IGFBPs). Cross-linking of [125I]IGF-I to pars tuberalis membrane homogenates and analysis by SDS-PAGE under reducing conditions confirmed the presence of both IGF-I receptors and binding proteins. Autophosphorylation of a 97 kDa substrate, compatible with the β-sub-unit of the IGF-I receptor, was increased in the presence of IGF-I, indicating the existence of functional IGF-I receptors on the ovine pars tuberalis. In contrast in the rat [125I]IGF-I binding was restricted to the median eminence region of the brain and was not detectable over the pars tuberalis." @default.
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• W2018644590 title "Localization of [125I]IGF-I Binding on the Ovine Pars Tuberalis" @default.
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