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Plasma PRL levels in male rats are highest during the peripubertal period. We previously reported that the posterior pituitary (PP) contains a potent PRL-releasing factor (PRF), a trypsin-insensitive small peptide which is distinct from known PRL secretagogues. The objectives were to determine the ontogeny of PRF activity in the PP as well as age-related(More)
Estrogen is a robust stimulator of galanin synthesis and secretion in the anterior pituitary. Galanin is colocalized in lactotrophs in the estrogen-treated anterior pituitary, and its roles in lactotroph function are still being elucidated. In the present studies, we quantified the phenotypes of estrogen-treated Fischer 344 rat anterior pituitary cells(More)
Galanin is localized within specific cell types of the rat anterior pituitary gland (AP). Immunocytochemical studies at the light microscope level have shown that lactotrophs, somatotrophs, and thyrotrophs contain galanin in the intact female rat, whereas lactotrophs in the male AP do not. We recently reported that galanin and PRL release from(More)
The purpose of this study was to evaluate interactions between estradiol and the 3',5' cyclic adenosine monophosphate (cAMP) signaling pathway to regulate tyrosine hydroxylase (TH) activity in hypothalamic dopaminergic neurons. The first experiment examined the ability of forskolin to activate TH in the tuberoinfundibular dopaminergic neurons of adult(More)
Male and female rats were tested for locomotor activity and spontaneous circling (rotation) at 4, 6, 8, 11, 13 and 15 weeks of age. Locomotor activity of females increased with age, and significant intersex differences which became apparent by 8 weeks of age were attributed to the greater persevering tendency of the females. Spontaneous rotation, on the(More)
Both neuropeptide Y (NPY) and galanin (GAL) systems have been implicated in the excitatory regulation of pulsatile LH secretion in the ovariectomized rat. The present studies were designed to examine the possible interaction of these two neuropeptides in controlling episodic LH release by testing the effects of central infusion of antibodies (Ab) to NPY and(More)
The effects of estradiol and growth hormone-releasing hormone (GHRH) on galanin release from anterior pituitary cells were examined in vitro. 17-beta-Estradiol (0.001-10 nM) increased galanin secretion from anterior pituitary cells in a concentration-dependent manner. Estradiol (10 nM) increased galanin release 300 and 600% from pituitary cells of(More)
Pulsed electromagnetic fields (PEMF) have been shown to increase the rate of nerve regeneration. Transient post-transection loss of target-derived nerve growth factor (NGF) is one mechanism proposed to signal induction of early nerve regenerative events. We tested the hypothesis that PEMF alter levels of NGF activity and protein in injured nerve and/or(More)
We previously reported that the rat posterior pituitary contains a potent PRL-releasing factor (PRF) which is distinct from oxytocin (OT), TRH, and angiotensin II (AII). The objectives of this study were 1) to examine whether posterior pituitary extracts stimulate PRL release in the presence of dopamine (DA), 2) to determine the chemical nature of PRF, and(More)