Maria Angeles Villanúa

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Marijuana and its cannabinoid constituents have profound effects on anterior pituitary hormone secretion. Exposure to delta 9-tetrahydrocannabinol inhibits gonadotropin, prolactin, growth hormone, and thyroid-stimulating hormone release and stimulates the release of corticotropin. Consequently, cannabinoid exposure could have profound effects on the(More)
Animal models have revealed that psychoactive cannabinoids induce both anxiolytic and anxiety-like reactions which are dose- and context-dependent. In the present study we examined the acute actions of the CB1 cannabinoid receptor antagonist SR 141716A in both the defensive withdrawal test and the elevated plus-maze in rats. Acute administration of SR(More)
Recent reports have provided evidence of a link between the endogenous brain cannabinoid system and the endogenous central opioid systems. Here we report that the selective CB1 receptor antagonist SR 141716A induced behavioral and endocrine alterations associated with opiate withdrawal in morphine-dependent animals in a dose-dependent manner and that(More)
Acute exposure to delta 9-tetrahydrocannabinol (THC), the main psychoactive constituent of marijuana, produces a well-characterized set of neuroendocrine effects. The recent description of both brain cannabinoid receptors (CB-1) and anandamide, their proposed endogenous ligand, has renewed the interest in cannabinoid actions in the brain. However, the(More)
Endocrine side effects of the immunosuppressive drug cyclosporine (CyA) include changes in anterior pituitary hormone secretion. The aim of the present study was to examine the effects of CyA on the responsiveness of in situ and ectopic anterior pituitary prolactin (PRL), growth hormone (GH) and luteinizing hormone (LH) release response to dopamine (DA) and(More)
Melatonin administration to pituitary-grafted male and female rats resulted in a marked decrease of previously high plasma prolactin levels, while an increase in prolactin levels was observed in sham-operated controls. The latter effect was significant only in males. Treatment with melatonin did not modify basal LH hormone levels or LH responses to(More)
The changes in substance P concentrations in the hypothalamus of female golden hamsters were studied at the different stages of the estrous cycle. Substance P levels in the hypothalamus of hamsters were highest during estrus and lowest during diestrus I and proestrus. The concentrations of substance P during diestrus II were not significantly different from(More)
Natural and synthetic cannabinoid receptor agonists have been described to exert profound effects on both the neuroendocrine integration and the functional responses of the immune system. In the present study, Wistar rats were exposed to the highly potent cannabinoid agonist HU-210 (1, 5 and 25 microg/kg) during gestation and lactation and the ensuing(More)
The fluctuations in the neurokinin A concentrations in the hypothalamus and anterior pituitary of female golden hamsters were studied in the different stages of the estrous cycle, and they were correlated with the changes in serum estradiol levels. Neurokinin A levels in the hypothalamus were lowest at day 4 of the cycle (proestrus), when serum estradiol(More)
The possible existence of an increased susceptibility to the reinforcing properties of morphine was analyzed in male and female rats born from mothers exposed to delta9-tetrahydrocannabinol (THC, 1, 5, or 20 mg/kg) during gestation and lactation. Maternal exposure to low doses of THC (1 and 5 mg/kg), relevant for human consumption, resulted in an increased(More)