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1.

001-es BibID:BIBFORM073589
Első szerző:Bodnár Ibolya
Cím:Stress- as well as suckling-induced prolactin release is blocked by a structural analogue of the putative hypophysiotrophic prolactin-releasing factor, salsolinol / I. Bodnar, B. Mravec, L. Kubovcakova, E. B. Toth, F. Fulop, M. I. K. Fekete, R. Kvetnansky, G. M. Nagy
Dátum:2004
ISSN:0953-8194
Megjegyzések:Prolactin is secreted from the anterior lobe of the pituitary gland in response both to suckling and to stress. We recently observed that 1?methyl?6,7?dihydroxy?1,2,3,4?tetrahydroisoquinoline (salsolinol), produced in the neurointermediate lobe of the pituitary gland, as well as in the medial basal hypothalamus, can selectively release prolactin from the anterior pituitary. Therefore, it has been proposed that salsolinol is a putative endogenous prolactin?releasing factor (PRF). Here, we report that one structural analogue of salsolinol, 1?methyl?3,4?dihydroisoquinoline (1MeDIQ), can block salsolinol?induced release of prolactin, but does not affect prolactin release in response to thyrotropin releasing hormone (TRH), ??methyl?p?tyrosine (?MpT) (an inhibitor of tyrosine hydroxylase), domperidone (a D2 dopamine receptor antagonist), or 5?hydroxytryptophan (5?HTP), a precursor of serotonin). 1MeDIQ profoundly inhibited suckling?, immobilization?, as well as formalin?stress induced prolactin release without any influence on corticosterone secretion. The 1MeDIQ?induced reduction in prolactin response to immobilization stress was dose?dependent. These results suggest that salsolinol can play a pivotal role in the regulation of prolactin release induced by either physiological (suckling) or environmental (stress) stimuli.
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Neuroendocrinology 16 : 3 (2004), p. 208-213. -
További szerzők:Mravec, B. Kubovcakova, L. Tóth E. Béla (1960-) (orvos) Fülöp Ferenc Fekete I. K. Márton Kvetnansky, R. Nagy György M.
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DOI
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2.

001-es BibID:BIBFORM073592
Első szerző:Bodnár Ibolya
Cím:Brain structures mediating the suckling stimulus-induced release of prolactin / I. Bodnár, Zs. Bánky, B. E. Tóth, G. M. Nagy, B. Halász
Dátum:2002
ISSN:0953-8194
Megjegyzések:Suckling?induced prolactin release is a widely studied neuroendocrine reflex, comprising a neural afferent and a humoral efferent component. The information on the brain structures involved in this reflex is fairly limited. The present studies focused on this question. The following hypothalamic interventions were made in lactating rats and the dams were tested for the suckling?induced prolactin response: (i) unilateral or (ii) bilateral frontal cuts at the level of the anterior and posterior hypothalamus; (iii) administration of 5,7?dihydroxytryptamine or (iv) 6?hydroxydopamine into the hypothalamic paraventricular nucleus (PVN) to destroy serotonergic and catecholaminergic innervation of the cell group, respectively; (v) lesion of the medial subdivision of the PVN; and (vi) horizontal knife cuts below the PVN. Bilateral posterior and bilateral or unilateral anterior frontal cuts caused blockade of the suckling?induced release of prolactin. Likewise, most dams receiving 5,7?dihydroxytryptamine in the PVN did not respond to the suckling stimulus. Immunocytochemistry revealed that, in those rats which did not show a rise in plasma prolactin, there were almost no serotonergic fibres and terminals in the PVN, while in dams which exhibited a response, numerous serotonergic elements were evident. 6?Hydroxydopamine treatment did not cause significant alteration in the prolactin response. Lesion of the medial, largely parvocellular subdivision of the PVN, or horizontal knife cuts below this cell group, blocked the hormone response. The findings demonstrate for the first time that: (i) interruption of the connections between the brain stem and the hypothalamus interferes with the prolactin response to the suckling stimulus; (ii) serotonergic fibres terminating in the hypothalamic PVN are involved in the mediation of the suckling stimulus; and (iii) within the PVN, neurones in the medial, largely parvocellular subdivision of the cell group take part in the transfer of the neural signal, eventually inducing prolactin release.
Tárgyszavak:Orvostudományok Egészségtudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Neuroendocrinology 14 : 5 (2002), p. 384-396. -
További szerzők:Bánky Zsuzsanna Tóth E. Béla (1960-) (orvos) Nagy György M. Halász Béla
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3.

001-es BibID:BIBFORM030625
Első szerző:Bodnár Ibolya
Cím:Effect of neonatal treatment with monosodium glutamate on dopaminergic and L-DOPA-ergic neurons of the medial basal hypothalamus and on prolactin and MSH secretion of rats / Ibolya Bodnár, Pál Göőz, Hitoshi Okamura, Béla E. Tóth, Miklós Vecsernyés, Béla Halász, György M. Nagy
Dátum:2001
ISSN:0361-9230
Megjegyzések:The effect of neonatal treatment with monosodium L-glutamate (MSG) on the dopaminergic systems of the medial basal hypothalamus has been investigated using tyrosine hydroxylase (TH) and aromatic L-amino acid decarboxylase (AADC) immunocytochemistry. Changes in plasma levels of prolactin (PRL) and alpha-melanocyte-stimulating hormone (MSH) have also been determined in intact and in MSG-treated rats after inhibition of TH by alpha-methyl-p-tyrosine (alpha-MpT) or without inhibition of enzyme activity. Monosodium glutamate resulted in a 40% reduction in the number of TH immunopositive tuberoinfundibular neurons, but no change in the number of AADC-positive tuberoinfundibular nerve cells, indicating that this reduction has occurred mainly in TH-positive but AADC-negative elements, i.e., in L-DOPA-ergic neurons. In contrast, MSG did not cause changes in the number of TH and AADC immunoreactive neurons of the periventriculohypophysial and tuberohypophysial dopaminergic systems, and it did not influence basal plasma PRL levels. alpha-methyl-p-tyrosine has increased plasma PRL concentrations in both control and MSG-treated rats of both sexes, but significantly higher responses were detected in females. None of the treatments had any effect on plasma MSH level. These findings suggest that MSG affects primarily L-DOPA-ergic neurons located in the ventrolateral part of the arcuate nucleus, but not dopaminergic neurons situated in the dorsomedial part of the arcuate nucleus; neither PRL nor MSH secretion is altered by MSG; a significant sex difference exists in the pituitary PRL response to inhibition of TH, and this response is not affected by MSG.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
arcuate nucleus
tyrosine hydroxylase
aromatic L-amino acid decarboxylase
immunocytochemistry
Megjelenés:Brain Research Bulletin 55 : 6 (2001), p. 767-774. -
További szerzők:Göőz Pál Okamura, Hitoshi Tóth E. Béla (1960-) (orvos) Vecsernyés Miklós (1959-) (gyógyszertechnológus, endokrinológus) Halász Béla Nagy György M.
Pályázati támogatás:T-30748
OTKA
T-029004
OTKA
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Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM066180
035-os BibID:(cikkazonosító)GP121
Első szerző:Nagy György M.
Cím:Expression of dopamine (DA) D2 receptors (D2R) in corticotroph cells is responsible for the switch of hypothalamic regulation of ACTH secretion to DA in lactating rats / György M. Nagy, Pálma Fehér, Ibolya Bodnár, Reid Luke, Zsuzsanna E. Tóth, Miklós Vecsernyés, Béla E. Tóth
Dátum:2016
ISSN:1470-3947 1479-6848
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok poszter
folyóiratcikk
Megjelenés:Endocrine Abstracts. - 41 (2016), p. 1. -
További szerzők:Fehér Pálma (1976-) (gyógyszerész) Bodnár Ibolya Luke, Reid Tóth Zsuzsanna (1977-) (kardiológus) Vecsernyés Miklós (1959-) (gyógyszertechnológus, endokrinológus) Tóth E. Béla (1960-) (orvos)
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Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM073665
Első szerző:Oláh Márk
Cím:Role of salsolinol in the regulation of pituitary prolactin and peripheral dopamine release / Márk Oláh, Ibolya Bodnár, Galit Daniel, Béla E. Tóth, Miklós Vecsernyés, György M. Nagy
Dátum:2011
ISSN:1445-5781 1447-0578
Megjegyzések:(R)?Salsolinol (SAL), a dopamine (DA)?related tetrahydroisoquinoline, has been found in extracts of the neuro?intermediate lobes (NIL) of pituitary glands and in the median eminence of the hypothalamus obtained from intact male rats and from ovariectomized and lactating female rats. Moreover, analysis of SAL concentrations in NIL revealed parallel increases with plasma prolactin (PRL) in lactating rats exposed to a brief (10 min) suckling stimulus after 4?h separation. SAL is sufficiently potent in vivo to account for the massive discharge of PRL that occurs after physiological stimuli (i.e. suckling). At the same time, it was without effect on the secretion of other pituitary hormones. It has been also shown that another isoquinoline derivative, 1?methyldihydroisoquinoline (1MeDIQ), which is a structural analogue of SAL, can dose?dependently inhibit the in?vivo PRL?releasing effect of SAL. Moreover, 1MeDIQ can inhibit the elevation of plasma PRL induced by physiological stimuli, for example suckling, or in different stressful situations also. 1MeDIQ also has a psycho?stimulant action, which is fairly similar to the effect of amphetamine, i.e. it induces an increase in plasma catecholamine concentrations. It is clear from these data that this newly discovered endogenous compound could be involved in regulation of pituitary PRL secretion. It has also been observed that SAL is present in peripheral, sympathetically innervated organs, for example the atrium, spleen, liver, ovaries, vas deferens, and salivary gland. Furthermore, SAL treatment of rats results in dose?dependent and time?dependent depletion of the DA content of the organs listed above without having any effect on the concentration of norepinephrine. More importantly, this effect of SAL can be completely prevented by amphetamine and by 1MeDIQ pretreatment. It is clear there is a mutual interaction between SAL, 1MeDIQ, and amphetamine or alcohol, not only on PRL release; their interaction with catecholamine "synthesis/metabolism" of sympathetic nerve terminals is also obvious.
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Reproductive Medicine and Biology 10 : 3 (2011), p. 143-151. -
További szerzők:Bodnár Ibolya Daniel, Galit Tóth E. Béla (1960-) (orvos) Vecsernyés Miklós (1959-) (gyógyszertechnológus, endokrinológus) Nagy György M.
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6.

001-es BibID:BIBFORM073595
Első szerző:Tóth E. Béla (orvos)
Cím:Physiological role of salsolinol : its hypophysiotrophic function in the regulation of pituitary prolactin secretion / Béla E. Tóth, Ibolya Bodnár, Krisztián G. Homicskó, Ferenc Fülöp, Márton I. K. Fekete, György M. Nagy
Dátum:2002
ISSN:0892-0362
Megjegyzések:We have recently observed that 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (salsolinol) produced by hypothalamic neurons can selectively release prolactin from the anterior lobe (AL) of the pituitary gland. Moreover, high affinity binding sites for SAL have been detected in areas, like median eminence (ME) and the neuro-intermediate lobe (NIL) that are known terminal fields of the tuberoinfundibular DAergic (TIDA) and tuberohypophysial (THDA)/periventricular (PHDA) DAergic systems of the hypothalamus, respectively. However, the in situ biosynthesis and the mechanism of action of SAL are still enigmatic, these observations clearly suggest that sites other than the AL might be targets of SAL action. Based on our recent observations it may be relevant to postulate that an "autosynaptocrine" regulatory mechanism functioning at the level of the DAergic terminals localized in both the ME and NIL, may play a role in the hypophyseotrophic regulation of PRL secretion. Furthermore, SAL may be a key player in these processes. The complete and precise mapping of these intra-terminal mechanisms should help us to understand the tonic DAerg regulation of PRL secretion. Moreover, it may also give insight into the role of pre-synaptic processes that most likely have distinct and significant functional as well as pathological roles in other brain areas using DAergic neurotransmission, like striatonigral and mesolimbic systems.
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Neurotoxicology and Teratology 24 : 5 (2002), p. 655-666. -
További szerzők:Bodnár Ibolya Homicskó Krisztián Gy. Fülöp Ferenc Fekete I. K. Márton Nagy György M.
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Intézményi repozitóriumban (DEA) tárolt változat
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