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Clinical Neuroscience

MARCH 20, 2007

[PITUITARY ATRIAL NATRIURETIC PEPTIDE OF PARAVENTRICULAR NUCLEUS ORIGIN]

FODOR Mariann, MAKARA B. Gábor, PALKOVITS Miklós

[Atrial natriuretic peptide-synthesizing neurons in the hypothalamic paraventricular nucleus constitute the major sources of ANP in the three lobes of the pituitary gland. Complete transection of the pituitary stalk eliminated 93% of ANP from the intermediate lobe, 47 and 77% from the anterior and the posterior lobes, respectively. Meantime, increased levels of immunoreactive ANP were measured in the median eminence, due to the accumulation of the peptide in the transected axons centrally to the transected stalk and in the paraventricular nucleus. It is likely that ANP neurons in the paraventricular nucleus innervate the pituitary, but those in the periventricular (median) preoptic nucleus and the organum vasculosum laminae terminalis may not contribute to the ANP innervation of the pituitary gland.]

Clinical Neuroscience

MARCH 20, 2007

[SALSOLINOL AND THE PERIPHERAL SYMPATHETIC ACTIVITY: THE EFFECTS OF HYPOPHYSECTOMY, ADRENALECTOMY AND ADRENAL MEDULLECTOMY]

SZÉKÁCS Dániel, BODNÁR Ibolya, NAGY M. György, FEKETE I.K. Márton

[The endogenous isoquinoline salsolinol (SALS) is a recently identified prolactin (PRL) releasing factor, a selective and potent stimulator of PRL secretion both in vivo and in vitro. SALS decreased the peripheral tissue dopamine (DA) level dose dependently, consequently increased the NE/DA ratio, indicating reduced release of newly formed norepinephrine (NE) from sympathetic terminals. The aim of our study was to investigate the effect of adrenal medullectomy (MEDX), adrenalectomy (ADX) and hypophysectomy (HYPOX) on the action of SALS on the PRL secretion, and on the catecholamine concentration of the selected sympathetically innervated peripheral tissues (atrium, spleen, etc). The experiments were done in male rats of 200-300 g body weight kept in air conditioned room with regular lighting. We used high-pressure liquid chromatography with electrochemical detection (HPLC-EC) for measurement of NE and DA concentrations, and radioimmunoassay for prolactin measurement. In MEDX as well as in ADX rats, SALS (25 mg/kg i.p.) was able to reduce DA level and increase the NE/DA ratio. The changes of prolactin secretion (increase by SALS) were not affected either by ADX or MEDX. Therefore the presence of the adrenal gland is not required for the changes of prolactin secretion, nor for the reduction of peripheral sympathetic activity induced by SALS. Investigating the possible effect of pituitary hormones on the peripheral sympathetic system, the action of SALS has been tested in HYPOX rats. We have found that the effect of SALS on peripheral sympathetic terminals is not affected by HYPOX, consequently the role of pituitary hormones in the effect of SALS on the peripheral catecholamine metabolism may be excluded.]

Hungarian Immunology

FEBRUARY 15, 2004

[β-endorphin concentrations in the cerebrospinal fluid and serum in systemic lupus erythematosus and multiple sclerosis patients]

BARACZKA Krisztina, BENDER Tamás, BARNA István, GÉHER Pál

[INTRODUCTION - The aim of the present study was to investigate the cerebrospinal fluid and serum β- endorphin levels in several diseases characterized by central nervous system demyelinisation. PATIENTS AND METHODS - Ten patients with systemic lupus erythematosus complicated with demyelinating syndrome and ten patients with chronic progressive form of multiple sclerosis were selected. Concentrations of β-endorphin were measured using a high sensitive, specific radioimmunoassay. Statistical significance (Wilcoxon test, two variable t test) and correlations (Spearman and Pearson correlations coefficients) were calculated. RESULTS - β-endorphin concentration in the cerebrospinal fluid did not differ in multiple sclerosis and systemic lupus erythematosus patients compared to the controls.]