Rafaela Aguilar

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Estrogen (E) is a key regulator of the synthesis and secretion of pituitary reproductive hormones [luteinizing hormone (LH), follicle-stimulating hormone (FSH) and prolactin (PRL)]. Until recently, it was thought that all biological actions of E at the pituitary were manifested through a single E receptor (R). The pituitary, like many other reproductive(More)
The innervation of the carotid body in the cat was studied by means of light- and electron-microscopic techniques. Sinus nerve resection, glossopharyngeal resection, bilateral cervical sympathectomy, excisions of two nerves, and injection of 6-hydroxydopamine (6-OH-DA) were performed in different groups of animals. It was found that resection of the sinus(More)
In the rat, administration of tamoxifen (TX) in the absence of oestrogen (E) induces LHRH self-priming, the progesterone receptor (PR)-dependent property of LHRH that increases gonadotrope responsiveness to itself. The oestrogen-dependent PR can be phosphorylated/activated by progesterone (P 4) and, in the absence of the cognate ligand, by intracellular(More)
Galanin (GAL), a neuroactive peptide detected in the hypothalamus and anterior pituitary, stimulated in a dose (0.1 and 1 microM)-dependent manner luteinizing hormone (LH) secretion from metestrous and proestrous rat pituitaries incubated in culture medium devoid of progesterone (P). GAL had no effect on follicle-stimulating hormone (FSH). Antiprogestin(More)
The specific role of each oestrogen receptor (ER) isoform (alpha and beta ) and site (nucleus and plasma membrane) in LH release was determined in ovariectomized (OVX) rats injected over 6 days (days 15-20 after OVX) with a saturating dose (3 mg/day) of tamoxifen (TX), a selective ER modulator with nuclear ERalpha agonist actions in the absence of(More)
The control of prolactin (PRL) secretion by N-methyl-D-aspartate (NMDA) and kainic acid (KA), agonists of NMDA and kainate receptors, and the interactions between NMDA and KA with nitric oxide (NO) were analysed in prepubertal female rats. For this purpose, serum PRL concentrations and hypothalamic and pituitary dopamine (DA) and serotonin (5-HT)(More)
Increases in cerebrospinal fluid (CSF) levels of the acute phase protein haptoglobin (Hp) occur in central nervous system (CNS) disorders such as Alzheimer's disease. To establish if Hp CSF level increases can be associated with Hp expression in brain, reverse transcription-polymerase chain reaction (RT-PCR) experiments were conducted to determine if the Hp(More)
Tamoxifen (TX) is an antiestrogen with varying levels of antagonist/agonist activity on the reproductive axis of the rat. It has been reported that TX, in contrast to other selective estrogen receptor modulators (SERMs), increases the content of cytosolic estrogen receptors (ER) in the gonadotrope and induces gonadotropin releasing hormone (GnRH)(More)
Selective estrogen receptor modulators (SERMs) are compounds which may function as agonists or antagonists depending upon the target tissue. This study compares the actions of different SERMs on luteinizing hormone (LH) secretion, and on gonadotropin-releasing hormone (GnRH) self-priming in the rat. To do this, 4-day cyclic rats were injected twice, on day(More)
OBJECTIVE The stimulatory and inhibitory effects of N-methyl-D-aspartic acid (NMDA) and kainic acid on prolactin (PRL) secretion have been correlated with the serum prolactin concentrations before drug administration. In the present experiments, we analysed the role of NMDA and kainic acid in PRL secretion in females with different serum concentrations of(More)