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1.

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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2.

001-es BibID:BIBFORM013978
Első szerző:Fehér Pálma (gyógyszerész)
Cím:Dephosphorylation/inactivation of tyrosine hydroxylase at the median eminence of the hypothalamus is required for suckling-induced prolactin and adrenocorticotrop hormone responses / Fehér Pálma, Oláh Márk, Bodnár Ibolya, Hechtl Dániel, Bácskay Ildikó, Juhász Béla, Nagy György M., Vecsernyés Miklós
Dátum:2010
ISSN:0361-9230
Megjegyzések:Wehave recently found that dopamine (DA) released from terminals of the hypothalamic neuroendocrine dopamine (NEDA) neurons plays a role not only in prolactin (PRL), but also in adrenocorticotrop hormone (ACTH) secretion, without having any influence on alfa-melanocyte-stimulating hormone (alfa-MSH) release in lactating dams. The aim of our present studies was to further investigate this DAerg regulation of ACTH using consecutively applied physiological stimulation (suckling) and pharmacological inhibition of the rate-limiting enzyme of DA synthesis (tyrosine hydroxylase, TH) by alfa-methyl-p-tyrosine (alfa-MpT) that acutely affect secretion of these pituitary hormones during lactation. Following 4 h separation period, two experimental groups were formed. In the first group, lactating rats were assembled with their litters for 60 min prior to alfa-MpT. In the second group, the alfa-MpT was injected first and 60 min later suckling stimulus was applied. Plasma samples were taken in every 15 min during the 90 min experimental period. Concentrations of plasma PRL, ACTH and alfa-MSH were measured by specific RIAs. Both stimuli applied in the first sequence, significantly elevated plasma PRL and ACTH levels in separated lactating dams, without having any effect on alfa-MSH secretion. Suckling applied in the first sequence was able to block the alfa-MpT-induced elevation of ACTH secretion, while PRL response was also significantly attenuated. alfa-MpT pretreatment prevented both PRL and ACTH responses to suckling stimulus. Investigating the dephosphorylation/inactivation of TH in the arcuate nucleus-ME (TIDA) regions, no pTH-immunoreactive perikarya or terminals can be found in continuously suckled dams. In contrast, after 4 h separation of the mothers from their litters, pTH-immunoreactivity can be clearly visualized in the external zone of ME. In alfa-MpT pretreated mothers following 4 h separation no pTH positive terminals are visible. No changes in the TH immunostaining can be observed in any of these experimental groups. In conclusion, dephosphorylation/inactivation of TH (the rate-limiting enzyme of the DA biosynthesis) in NEDA neurons is required for suckling-induced PRL and ACTH responses.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
prolactin
Megjelenés:Brain Research Bulletin. - 82 : 1-2 (2010), p. 141-145. -
További szerzők:Oláh Márk Bodnár Ibolya Hechtl Dániel Bácskay Ildikó (1969-) (gyógyszerész, gyógyszertechnológus) Juhász Béla (1978-) (kísérletes farmakológus) Nagy György M. Vecsernyés Miklós (1959-) (gyógyszertechnológus, endokrinológus)
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Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM030660
Első szerző:Radnai Balázs
Cím:Salsolinol induces a decrease in cyclic AMP at the median eminence and an increase at the adenohypophysis in lactating rats / Balázs Radnai, Zoltán Kandár, Anikó Somogyvári-Vigh, Zsuzsanna Mergl, Márk Oláh, Ferenc Fülöp, Miklós Vecsernyés, György M. Nagy
Dátum:2005
ISSN:0361-9230
Megjegyzések:Investigating the cellular events in the pituitary gland, the intracellular cyclic AMP (cAMP) of the median eminence (ME), neuro-intermediate lobe (NIL) and the anterior lobe (AL) have been measured following 15-min of intravenous injection of salsolinol (SAL). Parallel to the elevation of plasma prolactin (PRL), SAL induced a significant decrease of cAMP concentration in the ME. In contrast, SAL injection resulted in a significant increase of cAMP at the level of the AL. Changes in cAMP of the NIL as well as in the plasma level of vasopressin (VP) could not be detected. The observed changes in the level of cAMP following the acute treatment of SAL in the ME and the AL seems to be related to interacting neuroendocrine signals delivered from the ME to the AL through the long portal vessels to release PRL.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
pituitary gland
prolactin
tetrahydroisoquinoline
vasopressin
egyetemen (Magyarországon) készült közlemény
Megjelenés:Brain Research Bulletin 65 : 2 (2005), p. 105-110. -
További szerzők:Kandár Zoltán Somogyvári-Vigh Anikó Mergl Zsuzsanna Oláh Márk Fülöp Ferenc (Szeged) Vecsernyés Miklós (1959-) (gyógyszertechnológus, endokrinológus) Nagy György M.
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Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM031998
035-os BibID:PMID:9227842 WOS:A1997XH42600010
Első szerző:Vecsernyés Miklós (gyógyszertechnológus, endokrinológus)
Cím:Effect of posterior pituitary denervation (PPD) on prolactin (PRL) and alpha-melanocyte-stimulating hormone (alpha-MSH) secretion of lactating rats / Miklós Vecsernyes, Krisztina Krempels, Béla E. Toth, János Julesz, Gábor B. Makara, György M. Nagy
Dátum:1997
Megjegyzések:Previous data have clearly suggested that the posterior pituitary (PP), consisting of neural lobe (NL) and intermediate lobe (IL), has a role in the control of anterior pituitary PRL secretion. However, basic aspects of this regulatory mechanism like (1), the role of an intact hypothalamic innervation of the PP as well as (2) the site of production of previously found PRL releasing substance(s) have not yet been characterized. Denervation of the PP (PPD) is an effective method for having a selective lesion of the innervation of PP, indeed, PPD results in a disappearance of neurosecretory materials from NL and tyrosine hydroxylase (TH) immunoreactivity from IL, leaving blood supply of all three lobes intact. Blood samples were taken from freely moving sham an PP-denervated lactating rats before and after 4-h separation from their pups and during the suckling stimulus. PPD blocks separation-induced depletion but only attenuates suckling induced release of PRL. Furthermore, it doubles plasma level of alpha-MSH during the entire sampling period, which has been used as a marker for in vivo secretory activity of IL cells. Lack of the separation-induced depression in plasma PRL of PPD animals can be partially restored by normalizing the diabetes insipidus with treatment of a vasopressin analogue, 1-desamino-8-D-arginine-vasopressin (dDAVP). In contrast, dDAVP, neither alone nor in combination with oxytocin (OXY), can change PPD-induced elevation of plasma alpha-MSH as well as attenuation of PRL response induced by suckling. It is concluded that: (1) contribution of the THDA system parallel to the confirmed role in the regulation of alpha-MSH seems to be crucial for the depletion of plasma PRL induced by separation but not for the elevation due to suckling stimulus, (2) intact hypothalamic innervations of both NL and IL, regulating water intake and the secretion of alpha-MSH, respectively, are necessary for normal secretory responses of AL during lactation, (3) as well as for the presence of PRF activity in PP, (4) which does not solely responsible for suckling-induced PRL release. Therefore, an interplay between several substances produced by NIL of the pituitary gland must have been responsible for the intact regulation of PRL secretion during lactation.
Tárgyszavak:Orvostudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Posterior pituitary denervation
Prolactin
a-MSH
Lactating rats
Megjelenés:Brain Research Bulletin 43 : 3 (1997), p. 313-319. -
További szerzők:Krempels Krisztina Tóth E. Béla (1960-) (orvos) Julesz János Makara Gábor B. Nagy György M.
Pályázati támogatás:13055
OTKA
20916
OTKA
2922
OTKA
16827
OTKA
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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