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1.

001-es BibID:BIBFORM054217
035-os BibID:PMID: 10938896
Első szerző:Káplár Miklós (belgyógyász, diabetológus)
Cím:Increased leukocyte-platelet adhesion in chronic myeloproliferative disorders with high platelet counts / M. Kaplar, J. Kappelmayer, A. Kiss, K. Szabo, M. Udvardy
Dátum:2000
ISSN:0953-7104
Megjegyzések:The heterophilic adhesions between monocytes and platelets may result in the modification of both platelet and monocyte function. This mutual modification includes a greater activation of platelets with increased production of PDGF and other metabolites as well as an enhanced tissue factor expression of monocytes with greater activity in the circulation. The heterophilic aggregation has been well documented during extracorporal circulation, haemodialysis and in diabetic retinopathy. Here we provide evidence that there is significant increase of monocyte-platelet aggregates in disorders associated with high platelet counts, such as chronic myeloproliferative disorders. The presence of these heterophilic aggregates may contribute to the vascular complications observed frequently in polycythaemia vera and essential thrombocythaemia.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Platelets. - 11 : 3 (2000), p. 183-184. -
További szerzők:Kappelmayer János (1960-) (laboratóriumi szakorvos) Kiss Attila (1942-) (belgyógyász, haematológus) Szabó K. Udvardy Miklós (1947-) (belgyógyász, haematológus)
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2.

001-es BibID:BIBFORM023405
Első szerző:Káplár Miklós (belgyógyász, diabetológus)
Cím:The possible association of in vivo leukocyte-platelet heterophilic aggregate formation and the development of diabetic angiography / Káplár M., Kappelmayer J., Veszprémi A., Szabó K., Udvardy M.
Dátum:2001
ISSN:0953-7104
Megjegyzések:Circulating leukocyte-platelet heterophilic aggregates produce procoagulant, oxidative and mitogenic substances, and can cause microembolism in capillaries as well as acute arterial thrombosis. Our aim was to determine if there was any difference in the number of circulating heterophilic aggregates between diabetic patients and controls, if the formation of aggregates correlated with the actual HgbA1c level, duration of diabetes and postprandial rise in serum glucose level, with different vascular complications and whether decreasing postprandial serum glucose had any effect on heterophilic aggregate formation. The number of circulating heterophilic aggregates was measured in 90 diabetic patients (Type 1, 29; Type 2, 61) and in 23 control subjects by a flow-cytometric assay, and the result was given as percentage of the respective leukocyte subsets. There was no significant difference in lymphocyte-platelet and neutrophil-platelet aggregate number in patients and controls; however, there was a significant difference in the percentage of monocyte-platelet aggregates between the diabetic and control group (Type 1, 43.0 - 17.8; Type 2, 34.9 - 12.5; control, 24.6 - 8.2; P < 0.01 and P < 0.5, respectively). Patients with proliferative retinopathy and nephropathy showed the highest number of monocyte-platelet aggregates. No significant correlation was, however, found with HgbA1c. In Type 2 diabetes a non-significant, but remarkable, tendency between elevation of postprandial serum glucose levels and platelet-monocyte aggregate formation was observed and acarbose seemed to be effective in decreasing both. This study provides further support that heterophilic aggregates might have role in the pathogenesis of diabetic vascular complications. Read More: http://informahealthcare.com/doi/abs/10.1080/09537100120078368
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Platelets. - 12 : 7 (2001), p. 419-422. -
További szerzők:Kappelmayer János (1960-) (laboratóriumi szakorvos) Veszprémi Anikó Szabó K. Udvardy Miklós (1947-) (belgyógyász, haematológus)
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DOI
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3.

001-es BibID:BIBFORM023177
Első szerző:Rejtő László (belgyógyász, haematológus)
Cím:Effects of in vitro platelet activation on platelet derived nitric oxide production in helathy humans and in chronic myeloproliferative diseases with elevated platelet counts / L. Rejtő, M. Huszka, M. Kaplar., M. Udvardy
Dátum:2003
ISSN:0953-7104
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Platelets. - 14 : 5 (2003), p. 283-286. -
További szerzők:Huszka Mariann Káplár Miklós (1965-) (belgyógyász, diabetológus) Udvardy Miklós (1947-) (belgyógyász, haematológus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM042213
035-os BibID:PMID:23216455
Első szerző:Reményi Gyula (belgyógyász, haematológus)
Cím:Comparison of coated-platelet levels in patients with essential thrombocythemia with and without hydroxyurea treatment / Gyula Reményi, Róbert Szász, Ildikó Beke Debreceni, Mariann Szarvas, Péter Batár, Béla Nagy Jr, János Kappelmayer, Miklós Udvardy
Dátum:2013
ISSN:0953-7104
Megjegyzések:Essential thrombocythemia (ET) is an acquired myeloproliferative disorder with sustained increase of platelet count. This disease may be associated with thrombotic or bleeding complications due to the altered number and function of platelets. Coated-platelets produced by a simultaneous activation of collagen and thrombin represent a subpopulation of activated platelets with high prothombinase activity and the retention of several ?-granule-derived coagulation factors on their surface. There is a growing body of evidence for a relationship between variable levels of coated-platelets and different hemostatic alterations. However, no data are available on coated-platelet formation in the pathogenesis of ET in the presence or absence of treatment. The levels of coated-platelets in 43 ET patients (15 non-treated and 28 hydroxyurea-treated) without known thrombotic or hemorrhagic complications were analyzed using flow cytometry. These results were compared with data of 31 healthy individuals. In addition, platelet function was analyzed with PFA-100 analysis, and P-selectin (CD62) positivity was also measured by flow cytometry. Increased P-selectin expression was detected with prolonged PFA-100 closure times in the ET group; however, significantly lower levels of coated-platelets were found in non-treated ET patients compared to controls (23.1???8.8% vs. 37.6???12.7%, p?=?0.0008). This tendency was more evident in patients with JAK2-V617F mutation. Patients on hydroxyurea treatment had elevated coated-platelet levels (34.1???12.3%) close to the normal value. In conclusion, lower than normal levels of coated-platelets were generated in ET, which were significantly (p?=?0.0008) increased by hydroxyurea treatment. We suppose that abnormal coated-platelet level may also contribute to platelet dysfunction in ET.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Essential thrombocythemia
platelet activation
coated-platelets
P-selectin
flow cytometry
hydroxyurea
egyetemen (Magyarországon) készült közlemény
Megjelenés:Platelets. - 24 : 6 (2013), p. 486-492. -
További szerzők:Szász Róbert (1972-) (belgyógyász, haematológus) Bekéné Debreceni Ildikó (1970-) (biológus) Szarvas Mariann (1977-) Batár Péter (1969-) (belgyógyász, haematológus) Nagy Béla Jr. (1980-) (labordiagnosztikai szakorvos) Kappelmayer János (1960-) (laboratóriumi szakorvos) Udvardy Miklós (1947-) (belgyógyász, haematológus)
Internet cím:Szerző által megadott URL
DOI
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5.

001-es BibID:BIBFORM009904
Első szerző:Tóth Judit (laboratóriumi szakorvos)
Cím:Increased platelet glycoprotein Ib number, enhanced platelet adhesion and severe cerebral ischaemia in a patient with polycythaemia vera / Toth J., Kappelmayer J., Udvardy M. L., Szanto T., Szarvas M., Rejto L., Soltesz P., Udvardy M., Harsfalvi J.
Dátum:2009
Megjegyzések:The present study describes severe multiplex cerebral ischaemic laesions in a male patient being diagnosed with polycythaemia vera (PV). In contrast to previous publications, unique platelet receptor pattern with normal platelet count was identified. Glycoprotein Ib receptor number on the surface of resting platelets was increased two-fold and almost three-fold in case of activated platelets compared to the controls. More over, in an in vitro study when whole blood was circulated both at venous and arterial shear conditions and shear rate was adjusted according to the blood viscosity, platelet aggregate/thrombus formation was characteristic on surfaces covered with purified von Willebrand factor while in case of controls the surface was covered with single platelets or platelet monolayer. Similar results with pathological findings have not been published in PV until now. Our result undersigns the necessity of antiplatelet therapy of PV patients, even at normal platelet count.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Platelets. - 20 : 4 (2009), p. 282-287. -
További szerzők:Kappelmayer János (1960-) (laboratóriumi szakorvos) Udvardy Miklós László (1977-) (orvos, tudományos segédmunkatárs) Szántó Tímea Szarvas Mariann (1977-) Rejtő László (1963-) (belgyógyász, haematológus) Soltész Pál (1961-) (belgyógyász, kardiológus) Udvardy Miklós (1947-) (belgyógyász, haematológus) Hársfalvi Jolán (1949-) (klinikai biokémikus)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
elektronikus változat
DOI
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6.

001-es BibID:BIBFORM044333
Első szerző:Udvardy Miklós (belgyógyász, haematológus)
Cím:Possible role for platelet insulin receptors in modulating platelet function in health and diabetes mellitus / M. Udvardy, E. Posan, J. Harsfalvi, K. Rak
Dátum:1993
ISSN:0953-7104
Megjegyzések:Binding studies have shown that human platelets contain binding sites for insulin with a surface density similar to that described for other cells.(1) Evidence for a reduced number and affinity of human platelet membrane insulin binding sites in non-insulin dependent diabetes mellitus (NIDDM) has been provided.(2) However, the influence of insulin and insulin receptors on platelet function has not been completely investigated and clarified. Falcon et al(3) reported phosphorylation of a subunit of the insulin receptor on platelets in response to insulin, but no alterations were detected in cAMP formation or degradation, inositol phosphate formation or phosphorylation of proteins other than the receptor itself. On the other hand Trovati et al(4) found reduced platelet aggregation responses to ADP, PAF, epinephrine, collagen and arachidonate in the presence of 40 ?U/ml insulin. Their experience with an euglycemic-hyperinsulinemic clamp provided some further in vivo evidence to support the above mentioned findings. Platelet thromboxane A(2) formation was not altered in the presence of the hormone.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Insulin Receptors
cAMP
ADP
epinephrine
Megjelenés:Platelets. - 4 : 5 (1993), p. 287-288. -
További szerzők:Pósán Emőke (1963-) (belgyógyász, kardiológus) Hársfalvi Jolán (1949-) (klinikai biokémikus) Rák Kálmán (1929-2005) (belgyógyász, klinikai hematológus, véralvadás kutató)
Internet cím:DOI
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7.

001-es BibID:BIBFORM023407
Első szerző:Udvardy Miklós (belgyógyász, haematológus)
Cím:Increased in vivo platelet activation and reduced intravascular endothelium-derived relaxing factor and nitrate/nitrite production in patients with insulin-dependent diabetes mellitus / Udvardy M., Kaplar M., Rejto L., Tornai I., Palatka K., Laszlo P., Huszka M.
Dátum:1998
ISSN:0953-7104
Megjegyzések:Limited information seems to be available about the role of reduced endothelial production of endotheliumderived relaxing factor (EDRF)-nitrate/nitrite (NO) in the pathogenesis of diabetic angiopathy in insulindependent diabetes. A report of urinary and serum nitrate/nitrite, glucometabolic parameters, endothelial and in vivo platelet activation markers of 22 insulin dependent diabetics (IDDM) patients are given. Urinary and serum nitrate/nitrite concentrations were reduced in IDDM. This was independent of disease duration, presence of angiopathy and the glucometabolic parameters. A significant and inverse correlation of nitrate/nitrite excretion with endothelial markers (von Willebrand factor, soluble thrombomodulin) was documented. Moreover, reduced nitrate/nitrite excretion was strongly associated with elevated plasmatic beta -thromboglobulin levels. EDRF-NO production is reduced in IDDM and this reduction correlates with endothelial damage. Decreased nitrate/nitrite excretion may also influence in vivo platelet function, which results in increased in vivo platelet activation and suggests that the reduced intravascular production of EDRF-NO might play a role in the pathogenesis of angiopathy in IDDM.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Megjelenés:Platelets. - 9 : 3-4 (1998), p. 257-260. -
További szerzők:Káplár Miklós (1965-) (belgyógyász, diabetológus) Rejtő László (1963-) (belgyógyász, haematológus) Tornai István (1954-) (belgyógyász, gasztroenterológus) Palatka Károly (1961-) (belgyógyász, gasztroenterológus) László Pál (belgyógyász) Huszka Mariann
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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