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Hyperosmolality is a potent stimulus for the secretion of oxytocin. Oxytocinergic neurons are modulated by estrogen and oxytocin secretion in rats varies according to the phase of the estrous cycle, with higher activity during proestrus. We investigated the oxytocin secretion induced by an osmotic stimulus (0.5 M NaCl) in female rats. Plasma oxytocin and the oxytocin contents in the neurohypophysis...
Administration of sequential estradiol (E 2 ) and progesterone (P) for 2 weeks followed by withdrawal of P 48 h prior to sacrifice will increase oxytocin (OT) messenger ribonucleic acid (mRNA) levels in the paraventricular and supraoptic nuclei (PVN and SON) of the ovariectomized rat. Progesterone is known to mediate certain of its effects via binding to the gamma aminobutyric acid A (GABA...
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