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Interactions between endogenous opioid peptides and sex steroids in the central nervous system

100%
Bidzinska B., Jedrzejczuk D.
Postępy Higieny i Medycyny Doświadczalnej
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1995
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vol. 49
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issue 4
523-530
EN
Gonadal steroids and beta-endorphin (beta-EP) (and probably other - EOP endogenous opioid peptides) play a role of the pivotal hormones involved in integration of several neurophysiological mechanisms.The reproductive system could be disturbed at hypothalmic level by interference of beta-EP witn GnRH secretion and/or at pituitary level with response of gonadotropes to GnRH.Gonadal steriods, through a feedback mechanism, may exert similar effect on hypothalmus and/or pituitary.The action of EOP on the hypothalmo-pituitary-gonadal axis may be influenced by physiological and pathological changes in gonadal steroids during puberty, menstrual cycle in females, menopause, in case of idiopathic delayed puberty, in patients with gonadal dysgenesis or after castration.EOP seems to be "gonadaostat" system that have a key role in the transmission of gonadal feedback signals to the brain.
2
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Responses in the hypothalmic monoaminergic system activity in ewes to beta-endorphin, CRF and their antagonists

100%
Przekop F., Tomaszewska D.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
807-817
EN
This article reviews data concerning the action of opioidergic and monoaminergic system on LHRH secretion.Generally, in anestrus ewes beta-endorphin and/or corticoloberin significantly change extracellular concentrations of monoamine metabolites in the MBH-ME, but in estrus ewes both beta-endorphin and CRF alters also dopamine, noradrenaline and serotonin levels.Responses of catecholaminergic and serotoninergics system in the MBH-ME to naloxone or CRF-antagonist depend, to a large degree, on the phase of reproduction.In anestrous ewes subjected to stressful stimuli an opiate receptor blocker, naloxone, and CRF-antagonist attenuate the stress - induced activity of catecholaminergic and serotoninergic system in the MBH-ME; in non-stressed animals they suppress only serotoninergic system activity in this structure.No clear explanation can be offered now for either differences in response of catecholaminergic and serotoninergic system in MBH to beta-endorphin and CRF in various periods of reproduction or for differences in the response of these systems to CRF antagonist and naloxone in non-stressed and stressed ewes.It has been suggested that the responses in monoaminergic system activity are highly dependent upon the physiological state of the animal and that beta-endorphin and corticoliberin may indirectly modulate LHRH and other hypothalmic hormone secretion by monoaminergic systems.
3
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Effects of melatonin infused into the III ventricle on prolactin, beta-endorphin and luteotropin secretion in ewes during the different stages of the reproductive cycle

88%
Misztal T., Romanowicz K., Barcikowski B.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
769-778
EN
Secretion of all the pituitary hormones undergoes marked circadian and seasonal changes.The rhythmicity of these changes is controled by the circadian pacemaker system and the pineal gland transmitting daylength informatoin to the neuroendocrine axis via the secretion of melatonin.This article presents data on the effects of the short-term melatonin administratoin into the third brain ventricle on prolactin, beta-endorphin and luteotropin secretion in ewes kept under the increasing and decreasing daylenght conditions.Additional emphasis is given to dopamine and LHRH release in the madiobasal hypothalmus under the malatonin treatment by the push-pull method.The long-term and short-term actions of melatonin on the hormonal status in ewes is also discussed.
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