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- W2169444957 abstract "The present studies were designed to localize within the hypothalamus and neighboring areas the serotonergic terminals which are implicated in suckling-induced PRL release. The initial experiments were performed to characterize the circulating hormone profile induced by suckling in lactating rats, previously separated from their pups. Five minutes of suckling induced an increase in serum PRL only. During these 5 min, 5- hydroxytryptamine (5-HT) and 5-hydroxyindole-3-acetic acid concentrations were determined in the pars nervosa of the pituitary gland, hypothalamic nuclei, dorsal, and median raphe nuclei. An increase by 80% (P < 0.01) in 5-HT concentration was found only in the rostral part of the anterior hypothalamic nucleus (rNHA). In order to investigate causal effect between the altered 5-HT neuronal activity in the rNHA and the suckling- induced PRL release, serotonergic neurotoxin was bilaterally injected in the rNHA on day 1 of lactation. Litters were adjusted to eight pups each and weighed daily to determine litter growth rates. On day 8 of lactation, litters were separated from their mothers for 4 h and allowed to suckle for 5 or 15 min after which the mothers were decapitated. Litters from lesioned animals grew at a lower rate (P < 0.0001) than control and shamoperated animals. Serum PRL increased with suckling in animals bearing the correct rNHA lesions, but the values were lower than in control and sham-operated animals after 5 (P < 0.05) and 15 (P < 0.01) min. Therefore we postulate that the rNHA is the site of termination of a stimulatory serotonergic pathway on PRL release induced by suckling. (Endocrinology120: 2404–2412,1987)" @default.
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- W2169444957 date "1987-06-01" @default.
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- W2169444957 title "Serotonergic Terminals in the Anterior Hypothalamic Nucleus Involved in the Prolactin Release during Suckling*" @default.
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- W2169444957 doi "https://doi.org/10.1210/endo-120-6-2404" @default.
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