251
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Varga I, Hofstetter E, Schreiber M, Pipek J. Shape analysis of the level-spacing distribution around the metal-insulator transition in the three-dimensional Anderson model. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:7783-7786. [PMID: 9979753 DOI: 10.1103/physrevb.52.7783] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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252
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Tóth M, Rácz K, Kiss R, Fütö L, Varga I, Karlinger K, Dékány E, Czirják S, Pásztor E, Gláz E. [Thyroid-stimulating hormone-secreting pituitary adenoma]. Orv Hetil 1994; 135:2709-12. [PMID: 7991245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A 40-year-old male patient with a 2 years history of recurring hyperthyroidism is presented with clinical hyperthyroidism and diffuse goiter. Despite thyreostatic treatment and surgical thyroid ablation the hyperthyroidism recurred. The patient had laboratory evidence of hyperthyroidism and his serum TSH was persistently and enormously elevated (T4:214 nmol/l, T3:6.9 nmol/l, TSH:218 mIU/l)> Computed tomography and magnetic resonance imaging confirmed a pituitary mass of 7 cm in a-p diameter, with supra-, parasellar and sphenoidal extension. The pituitary adenoma was partially resected by transsphenoidal surgery, which failed to result in a substantial decrease in the serum thyrotropin level. Pituitary irradiation and a long-term somatostatin analog octreotide treatment (300-600 micrograms/die) combined with bromocriptine therapy resulted in a significant, but still incomplete suppression of thyrotropin secretion (TSH level about 15 mIU/l) and persisting mild hyperthyroidism. The size of the adenoma was unchanged during the two years of highdose octreotide treatment period. According to our best knowledge this is the first reported case of a thyrotropin-secreting pituitary adenoma in Hungary.
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253
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Novák Z, Németh I, Varga I, Matkovics B, Gyurkovits K. Role of free oxygen radicals in bronchial asthma and in cystic fibrosis. Respir Med 1994. [DOI: 10.1016/s0954-6111(05)80247-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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254
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Mátyus P, Kasztreiner E, Diesler E, Behr A, Varga I, Kosáry J, Rabloczky G, Jaszlits L. Synthesis and hypotensive activity of some heterocyclic analogues of GYKI-12 743. Arch Pharm (Weinheim) 1994; 327:543-6. [PMID: 7979923 DOI: 10.1002/ardp.19943270902] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
[1,4]Benzodioxanylmethyl-, [1,4]benzodioxanylmethylaminopropyl- and phenoxyethylaminoethyl-substituted lactams were synthesised and their hypotensive activity was investigated. Some of these compounds show moderate to high hypotensive effect, but they had more toxic and/or side effects than GYKI-12 743.
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255
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Varga I, Laczay P, Lehel J, Móra Z, Romváry A, Fekete J. Potentiation of ionophorous anticoccidials with dihydroquinolines: battery trials against Eimeria tenella in chickens. Int J Parasitol 1994; 24:689-94. [PMID: 7928071 DOI: 10.1016/0020-7519(94)90122-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Seven battery tests, employing a total of 1344 Hybro cockerels, were conducted in order to study the interaction between ionophorous anticoccidials and a new dihydroquinoline-type antioxidant known as duokvin. A significant, non-selective, toxic interaction was established, resulting in growth depression and improved anticoccidal efficacy against Eimeria tenella and E. mitis in these chickens. The duokvin itself showed no appreciable activity against the coccidia. The adverse effects of the interaction were eliminated, and the anticoccidial efficacy of the approved levels of ionophores was maintained, when the dietary levels of monovalent cation ionophorous monensin, salinomycin and narasin were reduced to approximately 12% in the presence of 120 p.p.m. duokvin. No adverse effects on the growth of chickens appeared in the combination with maduramicin, yet the enhancement of anticoccidial activity allowed an approx. 50% reduction of this ionophore as well.
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256
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Horváth Z, Lástity A, Varga I, Mészáros E, Molnár A. Determination of trace metals and speciation of chromium ions in atmospheric precipitation by ICP-AES and GFAAS. Talanta 1994; 41:1165-8. [DOI: 10.1016/0039-9140(94)80088-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/1993] [Revised: 11/18/1993] [Accepted: 11/30/1993] [Indexed: 11/26/2022]
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257
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Laczay P, Varga I, Mòra Z, Lehel J, Romvåry A, Semjén G, Fekete J. Potentiation of ionophorous anticoccidials with dihydroquinolines: reduction of adverse interactions with antimicrobials. Int J Parasitol 1994; 24:421-3. [PMID: 8070962 DOI: 10.1016/0020-7519(94)90093-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In two experiments, the compatibility of the anticoccidial combinations of monensin and duokvin, as well as that of maduramicin and duokvin, with some antimicrobials widely used in the broiler production was studied in cockerels. The monensin-duokvin combination was found to be fully compatible with erythromycin, sulphachlorpyrazine, and sulphaquinoxaline. With tiamulin, a slight interaction was observed, but it was far less severe than the toxic interaction between monensin and the diterpene antibiotic. The maduramicin-duokvin combination proved to be compatible with all of the chemotherapeutics tested, including tiamulin. The results of the studies indicate that the adverse interactions of monensin and maduramicin with certain antimicrobials can be considerably diminished or even abolished by using them in reduced doses in combination with the dihydroquinoline compound duokvin.
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258
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Varga I, Szabó O, Gergely P, Papp Z. [A case of successful pregnancy in a woman with anti-phospholipid syndrome and habitual abortion]. Orv Hetil 1994; 135:413-4. [PMID: 8139845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A case of a successful pregnancy is presented in a woman with anti-phospholipid syndrome and habitual abortions. She was treated with heparin-salicyl therapy during her pregnancy. No complications were noted. The significance of the presence of anti-phospholipid antibodies is stressed. The other therapeutic possibilities are discussed.
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259
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Ottlakán A, Varga I, Olasz M, Sátori O. [Splenic infarction and abscess as a complication of atrial fibrillation]. Orv Hetil 1994; 135:189-92. [PMID: 8290245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The case of a 64 year old man is presented by the authors whose spleen infarction developed in connection with atrial fibrillation was transformed into splenic abscess in spite of the applied conservative treatment. According to the overviewed literature the etiology, symptoms, diagnostic and therapeutic possibilities, as well as prognosis of these two entities related to spleen are described hereby.
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260
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Tóth M, Molnár G, Schaff Z, Rácz K, Kiss R, Fütö L, Varga I, Gláz E, Lapis K. [Flow-cytometric study of the DNA content in adrenal cortex tumors]. Orv Hetil 1993; 134:1411-5. [PMID: 8332362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Flow cytometric deoxyribonucleic acid measurements were performed on 26 adrenocortical tumours and 9 non-tumours adrenals. All but one tumours were classified both histologically and clinically as benign, however, two thirds of them had abnormal deoxyribonucleic acid stemlines. Proliferative indices of adenomatous tissues were significantly higher than those of non-tumorous adrenals (p < 0.01). When compared to tumors smaller than 5 cm in size, tumours larger than 5 cm displayed significantly higher proliferative indices (p < 0.01). Thus, flow cytometry appears to have only a limited value in distinguishing between benign and malignant adrenocortical tumours, but it may provide additional information about the prognosis of these tumours.
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261
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Gláz E, Rácz K, Varga I, Kiss R, Tóth M, Fütö L. Mineralocorticoid production of adrenal cortical adenomas. J Steroid Biochem Mol Biol 1993; 45:57-64. [PMID: 8481352 DOI: 10.1016/0960-0760(93)90122-d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We studied in vitro and in vivo corticosteroid production as well as the presence of symptoms of an increased mineralocorticoid effect in patients with 'silent' adrenal cortical adenomas, and compared these results to those found in patients with classical mineralocorticoid excess syndromes. We found that under in vitro conditions, cells from 'silent' adrenal cortical adenomas (n = 19) produced substantial amounts of both zona glomerulosa and fasciculata steroids, although the production of steroids in these cells was lower compared to that in mineralocorticoid-producing adenoma cells (n = 26). Patients with aldosterone-producing and 'silent' adenomas had significantly increased plasma atrial natriuretic peptide levels, which remained non-suppressible after upright posture and furosemide administration. Of the 25 patients with 'silent' adenomas, 11 had low and non-stimulable plasma renin activity (PRA) before but, in most cases, not after adrenal surgery. When compared to those with normal PRA (n = 14), patients with low PRA 'silent' adenomas (n = 11) had higher blood pressure which was significantly reduced after surgery, and a mild hypokalemia before but not after surgery. Although basal plasma concentrations of aldosterone, 18-hydroxy-corticosterone, corticosterone, deoxycorticosterone, 18-hydroxy-DOC, cortisol,11-deoxycortisol and 17-hydroxy-progesterone (17-OH-P) were not increased in either groups of 'silent' adenomas, ACTH stimulation produced a hyperreactive response for all measured steroids, of which an extremely high 17-OH-P seemed to be one of the most intriguing findings. We consider that these observations in 'silent' adrenal cortical adenomas may justify surgical intervention, irrespective of the size and potential malignancy of these adenomas.
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262
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Varga I. ["Medicina 2000"]. Orv Hetil 1993; 134:720. [PMID: 8460022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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263
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Varga I, Rácz K, Kiss R, Fütö L, Tóth M, Sergev O, Gláz E. Direct inhibitory effect of etomidate on corticosteroid secretion in human pathologic adrenocortical cells. Steroids 1993; 58:64-8. [PMID: 8387232 DOI: 10.1016/0039-128x(93)90054-q] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Etomidate has been shown to inhibit corticosteroid secretion in the normal adrenal gland, but its direct effect in human pathologic adrenals has not been clearly established. In the present study the effect of varying doses of etomidate (10(-11)-10(-5) M) was investigated on basal and adrenocorticotrophic hormone (ACTH)-stimulated corticosteroid secretions in isolated adrenocortical cells obtained from two patients with primary aldosteronism (adenoma and micronodular hyperplasia) and in those from a patient with Cushing's syndrome (adenoma). In cells from primary aldosteronism, increasing concentrations of etomidate (10(-11)-10(-5) M) produced a dose-dependent decrease of basal and ACTH-stimulated cortisol, aldosterone, 18-hydroxycorticosterone, and corticosterone secretions (ED50: 10(-9)-10(-8) M for each of these corticosteroids). In the same cells, the secretions of 11-deoxycortisol and deoxycorticosterone were increased in the presence of low (10(-9)-10(-7) M) but not high doses of etomidate (10(-6)-10(-5) M). In cells from Cushing's syndrome the changes in corticosteroid secretion were similar to those found in primary aldosteronism except that aldosterone and 18-hydroxycorticosterone could not be determined due to their low levels. Thus the potent inhibition of corticosteroids in human pathologic adrenocortical cells in the presence of low concentrations of etomidate may be predominantly due to inhibition of the 11 beta-hydroxylase enzyme, whereas higher doses of the drug may inhibit earlier steps of the corticosteroid biosynthetic pathway.
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264
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Tat�r E, Varga I, Z�ray G. Microwave assisted dissolution of aluminium oxide samples. Mikrochim Acta 1993. [DOI: 10.1007/bf01240166] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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265
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Fazekas I, Pásztor E, Slowik F, Bálint K, Dobronyi I, Bácsy E, Gyévai A, Péter F, Blatniczky L, Varga I. Pathological and experimental investigations in a case of gigantism. Acta Neuropathol 1993; 85:167-74. [PMID: 8382895 DOI: 10.1007/bf00227764] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A pituitary adenoma was transsphenoidally removed from a 4.5-year-old girl suffering from gigantism. Prior to the operation both the growth hormone (GH) and the prolactin (PRL) levels in the serum were elevated. By light microscopy the tumor appeared to be an acidophilic adenoma. Two distinct cell types, the densely granulated and the sparsely granulated cells, could be distinguished by electron microscopy. Double immunolabeling revealed the presence of GH alone in some densely granulated cells and PRL alone in some sparsely granulated cells, as well as GH and PRL co-localized in both of the morphologically distinguished cell types. Both cell types were identified in the monolayer and the suspension cultures by electron microscopy. GH and PRL concentrations in the culture media were measured by radioimmunoassay. The basal secretion of growth hormone was almost uniform during the 3-week cell culture period. GH and PRL release was significantly inhibited by bromocriptine. Our studies revealed a bimorphous and bihormonal mixed adenoma in childhood.
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266
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Túri S, Németh I, Varga I, Bodrogi T, Matkovics B. The effect of erythropoietin on the cellular defence mechanism of red blood cells in children with chronic renal failure. Pediatr Nephrol 1992; 6:536-41. [PMID: 1482641 DOI: 10.1007/bf00866497] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The glutathione redox system, haemoglobin (Hb) oxidation, the activity of antioxidant enzymes and the lipid peroxidation product malonyl dialdehyde (MDA) were studied in red blood cells (RBCs) during administration of recombinant human erythropoietin (rhEPO) over 12 weeks in ten children maintained on haemodialysis. A rapid increase in the reticulocyte count was accompanied by a slower rise in total Hb concentration. The mean level of oxidized glutathione (GSSG) increased from 13.2 +/- 5.3 nmol/g Hb to 56.7 +/- 15.8 nmol/g Hb 4 weeks after the start of rhEPO (P < 0.001), followed by a fall to the basal value. Reduced glutathione (GSH) levels showed a smaller though constant elevation during rhEPO therapy (P < 0.001). Before rhEPO treatment, incubation of RBCs for 1 h with acetylphenylhydrazine induced a decrease in GSH concentration compared with controls (P < 0.001), which became more pronounced in the first few weeks of rhEPO therapy (P < 0.001). In addition, the percentage of Hb derivatives (metHb and haemichrome) increased in the first 4 weeks of rhEPO therapy (P < 0.001). Although there was no significant difference between the values obtained preEPO and during EPO treatment, MDA levels were continuously higher and superoxide dismutase, catalase and glutathione peroxidase concentrations were lower than in the controls (P < 0.001). These results are compatible with oxidative damage to the RBCs in the early period of rhEPO therapy in children with end-stage renal failure. The GSH-GSSG system, as an important cellular defence mechanism of the RBCs, appears to be severely affected.
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267
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Pipek J, Varga I. Universal classification scheme for the spatial-localization properties of one-particle states in finite, d-dimensional systems. PHYSICAL REVIEW A 1992; 46:3148-3163. [PMID: 9908483 DOI: 10.1103/physreva.46.3148] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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268
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Varga I, Pipek J, Vasvári B. Power-law localization at the metal-insulator transition by a quasiperiodic potential in one dimension. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:4978-4981. [PMID: 10004262 DOI: 10.1103/physrevb.46.4978] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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269
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Varga I, Ványi A. Interaction of T-2 fusariotoxin with anticoccidial efficacy of lasalocid in chickens. Int J Parasitol 1992; 22:523-5. [PMID: 1644528 DOI: 10.1016/0020-7519(92)90154-d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Two battery tests were carried out to reveal whether or not there is an interaction between T-2 fusariotoxin and lasalocid, similar to that known with some ionophorous anticoccidials. In the first experiment, an excessive dose level of toxin (6 ppm) significantly reduced the anticoccidial efficacy of lasalocid at 75 ppm and almost completely eliminated that at 37.5 ppm in cockerels which had been infected with oocysts of Eimeria tenella and E. mitis. In the second experiment, the same dose of lasalocid was tested in combination with 0.5-1.25 ppm levels of toxin, i.e. levels occurring in the field, and all but the lowest level (0.5 ppm) significantly reduced the anticoccidial efficacy of lasalocid. Thus, in cases of outbreaks of coccidiosis, there is need to keep in mind such interaction between anticoccidials and mycotoxins.
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270
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Sergev O, Rácz K, Varga I, Kiss R, Fütö L, Gutkowska J, Gláz E. Dissociation of plasma atrial natriuretic peptide responses to upright posture and furosemide administration in patients with normal-, low renin essential hypertension and primary aldosteronism. CLINICAL AND EXPERIMENTAL HYPERTENSION. PART A, THEORY AND PRACTICE 1991; 13:409-23. [PMID: 1832596 DOI: 10.3109/10641969109045060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Plasma levels of atrial natriuretic peptide (ANP) were measured in patients with normal renin essential hypertension (n = 12), low renin essential hypertension (n = 11) and primary aldosteronism due to aldosterone producing adenoma (APA, n = 8) and idiopathic hyperaldosteronism (IHA, n = 3) after overnight rest in the supine position and after 4 h upright posture and furosemide administration. Plasma renin activity (PRA) and aldosterone (Aldo) levels were also determined. Compared to normal renin essential hypertension (33.6 +/- 2.2 pg/ml), basal plasma ANP was significantly higher in low renin essential hypertension (66.8 +/- 6 pg/ml), IHA (54.1 +/- 6.3 pg/ml) and APA before (62.4 +/- 4.9 pg/ml) but not after adrenal surgery (22 +/- 3 pg/ml). After upright posture and furosemide administration plasma ANP was decreased (p less than 0.01) in patients with low renin and, less markedly, with normal renin essential hypertension, however not in IHA and APA. In about half of the patients with low renin essential hypertension, unchanged PRA after upright posture and furosemide administration was associated with increased plasma Aldo and decreased ANP levels. We conclude that (i) the relatively high basal plasma ANP levels in low renin essential hypertension, IHA and APA may reflect the presence of volume expansion in these patients; (ii) the hormonal responses to upright posture and furosemide administration in patients with normal and low renin essential hypertension may indicate a counterregulatory role of ANP during activation of the renin-angiotensin-aldosterone system; (iii) the high plasma ANP, which is unresponsive to upright posture and furosemide administration, in patients with APA and IHA may be a potentially interesting new finding whose pathophysiological significance remains to be established.
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271
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Sergev O, Rácz K, Varga I, Kiss R, Fütö L, Gláz E. Atrial natriuretic peptide in normal and low renin essential hypertension. KIDNEY INTERNATIONAL. SUPPLEMENT 1990; 30:S107-8. [PMID: 2147964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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272
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Varga I, Pipek J. Localization properties of the nonbonding pi states at the Fermi level in amorphous carbon. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:5335-5338. [PMID: 9996102 DOI: 10.1103/physrevb.42.5335] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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273
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Sergev O, Rácz K, Varga I, Kiss R, Fütö L, Mohari K, Gláz E. Thyrotropin-releasing hormone increases plasma atrial natriuretic peptide levels in human. J Endocrinol Invest 1990; 13:649-52. [PMID: 2148757 DOI: 10.1007/bf03349587] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The effect of thyrotropin-releasing hormone (TRH) on plasma atrial natriuretic peptide (ANP), TSH, prolactin, cortisol and aldosterone levels in 26 patients with normal pituitary and thyroid gland function was examined. Bolus iv injection of 200 micrograms TRH produced, between 0 and 60 min, a significant gradual rise of plasma ANP concentrations from 30.4 +/- 2.3 to 54.8 +/- 6.4 pg/ml (mean +/- SE). Plasma prolactin and TSH concentrations increased four- and six-fold of basal values with peak responses at 15 and 30 min, respectively, whereas plasma cortisol and aldosterone concentrations remained unchanged after the drug treatment. The patients had no significant changes in blood pressure or pulse rate. We conclude that there may be indirect mechanism(s) which result in increased ANP levels after TRH administration.
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274
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Rácz K, Fehér J, Csomós G, Varga I, Kiss R, Gláz E. An antioxidant drug, silibinin, modulates steroid secretion in human pathological adrenocortical cells. J Endocrinol 1990; 124:341-5. [PMID: 2155989 DOI: 10.1677/joe.0.1240341] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Because human adrenocortical cells from different adrenal disorders exhibit pathologically altered corticosteroid synthesis, and free radical mechanisms may induce pathological changes in the activities of corticosteroid biosynthetic enzymes (cytochrome P-450), we examined the effect of an antioxidant, silibinin, on basal and ACTH-stimulated secretion of several corticosteroids in isolated adrenal cells from an aldosterone-producing adenoma, atrophied adrenal tissues surrounding the adenoma, and hyperplastic adrenals from Cushing's syndrome. In the presence of a high concentration (100 mumol/l) of silibinin, variably diminished secretion of basal aldosterone, corticosterone, cortisol, 18-OH-corticosterone and 11-deoxycorticosterone was found. In contrast, the addition of 0.01 mumol silibinin/l, which failed to produce a clear effect on basal corticosteroid secretion, resulted in a potentiation of ACTH-stimulated secretion of several corticosteroids in the adenomatous and hyperplastic adrenocortical cells. These results suggest that the dose-dependent dual effect of silibinin on corticosteroid secretion may be attributed to corresponding changes in the activities of cytochrome P-450 enzymes, and that stimulation of ACTH-induced corticosteroidogenesis by silibinin is presumably due to the antioxidant property of the drug.
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275
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Vitkova S, Avramov I, Raichewski G, Varga I, Kuzmann E, Czakó-Nagy I, Vértes A. Relaxation and crystallization in electrodeposited Fe31Ni45P23 amorphous alloys. Electrochim Acta 1989. [DOI: 10.1016/0013-4686(89)87045-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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276
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Langenbeck U, Varga I, Hansmann I. The predictive value of dermatoglyphic anomalies in the diagnosis of fra(X)-positive Martin-Bell syndrome (MBS). AMERICAN JOURNAL OF MEDICAL GENETICS 1988; 30:169-75. [PMID: 3177442 DOI: 10.1002/ajmg.1320300115] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In a representative group of 160 institutionalized mentally retarded males without Down syndrome, prospective dermatoglyphic-cytogenetic studies were performed in order to assess the utility of the dermatoglyphic index system of Rodewald [1986] for an efficient ascertainment of patients with Martin-Bell syndrome (MBS). A negative (abnormal) score was found in 32 men (20 +/- 3%), 14 of whom (predictive value: 44 +/- 9%) were fra(X)-positive. This prevalence of 14/160 = 9 +/- 2% patients with fra(X)-positive MBS indicates that in our study most, if not all, MBS patients have been detected by the simple pre-screening of dermatoglyphics. In the MBS patients, there was no correlation between the dermatoglyphic scores and percentage of fra(X)-positive cells.
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277
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Vajda K, Szabó A, Varga I. [Ultrastructure of skin biopsy specimens from uremic patients treated by peritoneal dialysis]. MORPHOLOGIAI ES IGAZSAGUGYI ORVOSI SZEMLE 1987; 27:9-18. [PMID: 3821755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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278
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Sólyom J, Cholnoky P, Helmuth D, Dietrich K, Nagy E, Varga I, Gláz E. [Diagnosis of steroid-11-beta hydroxylase deficiency]. Orv Hetil 1986; 127:2171-5. [PMID: 3463925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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279
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Faina AG, Simu G, Varga I, Palfi M, Rugea P. [Segmental bronchoalveolar lavage with a flexible tube via a rigid bronchoscope in a case of mediastinopulmonary sarcoidosis]. REVISTA DE IGIENA, BACTERIOLOGIE, VIRUSOLOGIE, PARAZITOLOGIE, EPIDEMIOLOGIE, PNEUMOFTIZIOLOGIE. PNEUMOFTIZIOLOGIA 1986; 35:257-61. [PMID: 3027863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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280
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Marrus R, Vicente VS, Charles P, Briand JP, Bosch F, Liesen D, Varga I. Relativistic two-photon emission: Lifetime of the 2 1S0 state of helium-like Kr34+. PHYSICAL REVIEW LETTERS 1986; 56:1683-1686. [PMID: 10032741 DOI: 10.1103/physrevlett.56.1683] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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281
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Szécsény A, Alánt O, Horányi J, Darvas K, Dabasi G, Berentei E, Szende B, Kiss R, Rácz K, Varga I. [Results of the surgical management of primary aldosteronism based on a retrospective analysis of preoperative diagnosis and morphology of the adrenal gland]. Orv Hetil 1985; 126:2139-51. [PMID: 3897953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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282
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Rácz K, Varga I, Kiss R, Gláz E. ACTH sensitivity of isolated human pathological adrenocortical cells: variability of responses in aldosterone, corticosterone, deoxycorticosterone and cortisol production. JOURNAL OF STEROID BIOCHEMISTRY 1984; 20:1187-94. [PMID: 6328122 DOI: 10.1016/0022-4731(84)90365-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In vitro aldosterone, deoxycorticosterone, corticosterone and cortisol production of human adrenocortical cells derived from adenomas (Conn's syndrome, Cushing's syndrome), from hyperplastic adrenals (Cushing's syndrome) and from adrenals surrounding aldosteronoma are described. Cells from adenomas causing either Cushing's syndrome or Conn's syndrome harboured the highest basal and ACTH-stimulated corticosteroid production. Adrenocortical cells derived from micronodular hyperplasia causing Cushing's syndrome and cells from cortisol producing adenoma displayed predominantly cortisol and corticosterone secretion both under basal conditions and following stimulation with ACTH. Aldosteronoma cells showed highly variable aldosterone, deoxycorticosterone, corticosterone and cortisol response to ACTH. However, in aldosteronoma cell suspensions, the basal and ACTH-stimulated ratios of aldosterone to cortisol were increased when compared to ratios of steroids produced by cells from other adrenal tissues. Chronic treatment with spironolactone of patients with Conn's syndrome before surgery was associated with a decreased ratio of aldosterone to corticosterone, revealing that 18-hydroxylase in aldosteronoma cells may be inhibited during long-term therapy. Non-tumorous cells isolated from adrenals surrounding aldosteronoma displayed less aldosterone prior to and after stimulation with ACTH than aldosteronoma cells.
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283
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Kiss R, Gláz E, Láng L, Rácz K, Varga I. [Evaluation of a rapid test for the study of mineralocorticoid activity in the body]. Orv Hetil 1983; 124:2789-92. [PMID: 6646743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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284
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Kenderesi P, Varga I, Boros G, Hiegl K, Kapolka P, Farkas J. [Insulin therapy by continuous infusion in hyperglycemic coma, based on a nomogram]. Orv Hetil 1983; 124:1983-8. [PMID: 6634147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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285
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Abstract
Broiler rabbit production has become an important branch of animal protein and fur production, not only in the traditionally rabbit breeding and consuming countries, but recently in many other countries of the world. The profitability of the rabbit industry is dependent primarily on the good feed conversion. Aspects of this include factors such as morbidity and mortality of infections, adequate knowledge and fulfilment of both accommodation and nutritional requirements, appropriate breeding systems, etc. There is much controversy about the role of coccidia in the losses of intensified rabbit breeding enterprises. There is no doubt about the significance of Eimeria stiedai which may cause condemnation of large amounts of liver as a result of infection in rabbit colonies of small holders. However, this parasite is rare in large scale rabbit farms. In the latter, intestinal coccidiosis is most frequently--although not invariably--incriminated either as a primary or more often as a predisposing factor of intestinal enteropathies causing severe mortality, mainly in the early post-weaning period. The ability to isolate and maintain species of Eimeria in specific pathogen-free (SPF) rabbits has made it possible to characterize them, such as the most pathogenic E. intestinalis and E. flavescens: the pathogenic E. magna, E. irresidua and E. piriformis; and the least pathogenic E. perforans, E. neoleporis (syn. of E. coecicola) and E. media species. Prophylactic measures are dealt with briefly, and laboratory and field trials with the currently most promising rabbit anti-coccidial drugs (Lerbek, robenidine and salinomycin) are dealt with in more detail.
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286
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Rácz K, Varga I, Gláz E, Kiss R, Vida S, Lada G, di Gleria K, Medzihradszky K, Lichtwald K, Vecsei P. Met-enkephalin inhibits mineralocorticoid production in isolated human aldosteronoma cells. J Clin Endocrinol Metab 1982; 54:656-60. [PMID: 7056849 DOI: 10.1210/jcem-54-3-656] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In vitro application of the morphinomimetic met-enkephalin resulted in inhibition of mineralocorticoid production by aldosterone-producing adenomas. Aldosterone, deoxycorticosterone, and corticosterone production by adrenocortical cells isolated from aldosteronomas has been studied under basal conditions and after stimulation with ACTH-(1-24). The blocking effect of met-enkephalin on the rate of aldosterone, deoxycorticosterone, and corticosterone release was significant at a concentration as low as 10(-11) M (P less than 0.001, P less than 0.01, and P less than 0.001, respectively). Dose-dependent inhibition of steroid biosynthesis became more apparent with increasing amounts of met-enkephalin in the incubation medium (10(-11)-10(-5) M); at a concentration of 10(-5) M, met-enkephalin decreased the production of aldosterone by 45%, that of deoxycorticosterone by 51%, and that of corticosterone by 44%. Increased steroid biosynthesis stimulated by ACTH-(1-24) was also significantly blocked by met-enkephalin. In a concentration of 10(-5) M, met-enkephalin produced significant decreases in aldosterone (P less than 0.001), deoxycorticosterone (P less than 0.05), and corticosterone (P less than 0.001) production compared to the peak values obtained after stimulation with 0.85 X 10(-10) M ACTH-(1-24). These data allow us to conclude that the inhibitory effect of met-enkephalin on mineralocorticoid production exerted at the level of the adrenals might be complementary to the factor(s) thought to be involved in the regulation of adrenal steroid production, playing a role similar to that of the biogenic amines originating in the adrenal medulla and regulating the adrenal cortex by a peripheral neurohumoral paracrine mechanism.
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287
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Rácz K, Gláz E, Kiss R, Lada G, Varga I, Vida S, Di Gleria K, Medzihradszky K, Lichtwald K, Vecsei P. Adrenal cortex - a newly recognized peripheral site of action of enkephalins. Biochem Biophys Res Commun 1980; 97:1346-53. [PMID: 7213360 DOI: 10.1016/s0006-291x(80)80015-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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288
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Beregi E, Varga I, Miltényi M, Kenéz B. The incidence of immunoglobulin-A deposits in glomerular diseases and its morphological examination: nephropathy with mesangial IgA dense deposits. Int Urol Nephrol 1977; 9:335-45. [PMID: 611125 DOI: 10.1007/bf02081952] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The presence of IgA with IgG, C', IgM and fibrin in 365 renal biopsy specimens has been studied by the immunohistological method. Glomerular IgA deposits were found in 38 cases (10.4%). The patients were divided into two groups according to the localization of IgA: 13 cases (3.56%) belonged to the first group, in which IgA showed diffuse mesangial localization. Light microscopic examination showed various stages of proliferative glomerulonephritis. These cases corresponded to the nephropathy described by Berger. In 25 cases (6.85%), belonging to the second group, the glomerular localization of IgA was found to be segmental and peripheral, appeared always in patches and was present with various histological alterations. Differentiation of the two kinds of alteration is possible primarily on the basis of the immunohistological pattern, but light microscopic and electron microscopic examination might also be helpful.
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289
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Matkovics B, Novák R, Hanh HD, Szabó L, Varga I, Zaleśna. A comparative study of some more important experimental animal peroxide metabolism enzymes. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1977; 56:31-4. [PMID: 299735 DOI: 10.1016/0305-0491(77)90218-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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290
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Beregi E, Varga I. Analysis of 260 cases of membranous glomerulonephritis in renal biopsy material. Clin Nephrol 1974; 2:215-21. [PMID: 4448020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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291
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Berecz M, Czeizel E, Varga I. [Epidemiologic and genetic family studies on psoriasis]. Orv Hetil 1974; 115:1039-44. [PMID: 4825514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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292
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Varga I, Beregi E, Böszörményi E, Kállay K, Kenéz B. [The significance of fibroelastosis of the renal arteries in glomerulonephritis]. Orv Hetil 1973; 114:1927-9. [PMID: 4732102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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293
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Varga I, Beregi E, Kenéz B. [Clinical and histopathological studies in oligosymptomatic kidney diseases in internal medicine. II. Hematuria and focal nephritis in adults]. Orv Hetil 1973; 114:131-6. [PMID: 4682482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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294
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Varga I, Beregi E, Kenéz B. [Clinical and histopathological studies in oligosymptomatic internal kidney diseases. I. Significance of isolated proteinuria]. Orv Hetil 1972; 113:2693-7. [PMID: 5083233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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295
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Varga I, Bakonyi F. [Driving ability in old age]. Orv Hetil 1971; 112:2918. [PMID: 5136325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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296
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Varga I. [Prof. Béla Berényi, Dean of the School of Dentistry of the Semmelweis School of Medicine, is 60 years old]. FOGORVOSI SZEMLE 1971; 64:369. [PMID: 4942054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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297
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Varga I. [Occlusion, articulation, resting position]. FOGORVOSI SZEMLE 1971; 64:33-42. [PMID: 5279577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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298
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299
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Szendrői Z, Láncos F, Kótay P, Varga I, Frang D, Magasi P. Book reviews. Int Urol Nephrol 1970. [DOI: 10.1007/bf02125822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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300
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Varga I. [Professor Peter Adler is 60 years old]. FOGORVOSI SZEMLE 1970; 63:161-2. [PMID: 4914064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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