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001-es BibID:BIBFORM058137
Első szerző:Bagi Zsolt (orvos)
Cím:Type 2 diabetic mice have increased arteriolar tone and blood pressure : enhanced release of COX-2-derived constrictor prostaglandins / Zsolt Bagi, Nora Erdei, Attila Toth, Wei Li, Thomas H. Hintze, Akos Koller, Gabor Kaley
Dátum:2005
ISSN:1079-5642
Megjegyzések:OBJECTIVE: Type 2 diabetes mellitus (T2-DM) is frequently associated with vascular dysfunction and elevated blood pressure, yet the underlying mechanisms are not completely understood. We hypothesized that in T2-DM, the regulation of peripheral vascular resistance is altered because of changes in local vasomotor mechanisms. METHODS AND RESULTS: In mice with T2-DM (C57BL/KsJ-(db-)/db-), systolic and mean arterial pressures measured by the tail cuff method were significantly elevated compared with those of control (db+/db-) animals (db/db, 146+/-5 and 106+/-2 mm Hg versus control, 133+/-4 and 98+/-4 mm Hg, respectively; P<0.05). Total peripheral resistance, calculated from cardiac output values (measured by echocardiography) and mean arterial pressure were significantly elevated in db/db mice (db/db, 25+/-6 versus control, 15+/-1 mm Hg[middot]mL(-1)[middot]min(-1)). In isolated, pressurized gracilis muscle arterioles (diameter approximately 80 microm) from db/db mice, stepwise increases in intraluminal pressure (from 20 to 120 mm Hg) elicited a greater reduction in diameter than in control vessels at each pressure step (at 80 mm Hg, db/db, 66+/-4% versus control, 79+/-3%). The passive diameters of arterioles (obtained in Ca2+-free solution) and the calculated myogenic index were not significantly different in the 2 groups. The presence of the prostaglandin H2/thromboxane A2 receptor antagonist SQ29548 did not affect arteriolar diameters of control mice but reduced the enhanced arteriolar tone of db/db mice back to control levels (at 80 mm Hg, 80+/-4%). The inhibitor of cyclooxygenase-1 (COX-1), SC-560, did not affect the basal tone of arterioles, whereas NS-398, an inhibitor of COX-2, caused a significant shift in the arteriolar pressure-diameter curve of vessels from db/db mice (at 80 mm Hg, 76+/-3%) but not in those of control mice. Also, in aortas of db/db mice, expression of COX-2 was enhanced compared with controls. CONCLUSIONS: Collectively, these findings suggest that in mice with T2-DM, the basal tone of skeletal muscle arterioles is increased because of an enhanced COX-2-dependent production of constrictor prostaglandins. These alterations in microvascular prostaglandin synthesis may contribute to the increase in peripheral resistance and blood pressure in T2-DM.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Arteriosclerosis Thrombosis and Vascular Biology. - 25 : 8 (2005), p. 1610-1616. -
További szerzők:Erdei Nóra (1979-) (orvos) Tóth Attila (1971-) (biológus) Li, Wei (1987-) (kutató) Hintze, Thomas H. Koller Ákos Kaley Gábor
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2.

001-es BibID:BIBFORM057819
Első szerző:Csató Viktória (molekuláris biológus)
Cím:Hydrogen peroxide elicits constriction of skeletal muscle arterioles by activating the arachidonic acid pathway / Viktória Csató, Attila Pető, Ákos Koller, István Édes, Attila Tóth, Zoltán Papp
Dátum:2014
ISSN:1932-6203
Megjegyzések:Aims: The molecular mechanisms of the vasoconstrictor responses evoked by hydrogen peroxide (H2O2) have not been clearly elucidated in skeletal muscle arterioles. Methods and results: Changes in diameter of isolated, cannulated and pressurized gracilis muscle arterioles (GAs) of Wistar-Kyoto rats were determined under various test conditions. H2O2 (10-100 ?M) evoked concentration-dependent constrictions in the GAs, which were inhibited by endothelium removal, or by antagonists of phospholipase A (PLA; 100 ?M 7,7-dimethyl-(5Z,8Z)-eicosadienoic acid), protein kinase C (PKC; 10 ?M chelerythrine), phospholipase C (PLC; 10 ?M U-73122), or Src family tyrosine kinase (Src kinase; 1 ?M Src Inhibitor-1). Antagonists of thromboxane A2 (TXA2; 1 ?M SQ-29548) or the non-specific cyclooxygenase (COX) inhibitor indomethacin (10 ?M) converted constrictions to dilations. The COX-1 inhibitor (SC-560, 1 ?M) demonstrated a greater reduction in constriction and conversion to dilation than that of COX-2 (celecoxib, 3 ?M). H2O2 did not elicit significant changes in arteriolar Ca2+ levels measured with Fura-2. Conclusions: These data suggest that H2O2 activates the endothelial Src kinase/PLC/PKC/PLA pathway, ultimately leading to the synthesis and release of TXA2 by COX-1, thereby increasing the Ca2+ sensitivity of the vascular smooth muscle cells and eliciting constriction in rat skeletal muscle arterioles.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
hydrogen peroxide
phospholipase C
arachidonic acid
smooth muscle calcium
constrictions
Megjelenés:Plos One. - 9 : 8 (2014), p. 1-10. -
További szerzők:Pető Attila (1990-) (általános orvos) Koller Ákos Édes István (1952-) (kardiológus) Tóth Attila (1971-) (biológus) Papp Zoltán (1965-) (kardiológus, élettanász)
Pályázati támogatás:OTKA-K108444
OTKA
OTKA-K84300
OTKA
OTKA-K109083
OTKA
TÁMOP-4.2.2.A-11/1/KONV-2012-0045
TÁMOP
Kardiológia Kutatócsoport
SROP-4.2.2.A-11/1/KONV-2012-0017
Egyéb
SROP-4.2.2.A-11/1/KONV-2012-0024
Egyéb
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3.

001-es BibID:BIBFORM085606
Első szerző:Cséplő Péter
Cím:Hemolyzed Blood Elicits a Calcium Antagonist and High CO2 Reversible Constriction via Elevation of [Ca2+] in Isolated Cerebral Arteries / Cseplo Peter, Vamos Zoltan, Torok Orsolya, Ivic Ivan, Toth Attila, Buki Andras, Koller Akos
Dátum:2017
ISSN:0897-7151
Megjegyzések:During acute subarachnoid hemorrhage, blood is hemolyzed, which is followed by a significant cerebrovascular spasm resulting in a serious clinical condition. Interestingly, however, the direct vasomotor effect of perivascular hemolyzed blood (HB) has not yet been characterized, preventing the assessment of contribution of vasoconstrictor mechanisms deriving from brain tissue and/or blood and development of possible treatments. We hypothesized that perivascular HB reduces the diameter of the cerebral arteries (i.e., basilar artery [BA]; middle cerebral artery [MCA]) by elevating vascular tissue [Ca2+]i level. Vasomotor responses were measured by videomicroscopy and intracellular Ca2+ by the Fura2-AM ratiometric method. Adding HB to the vessel chamber reduced the diameter significantly (BA: from 264???7 to 164???11??m; MCA: from 185???15 to 155???14??m), which was reversed to control level by wash-out of HB. Potassium chloride (KCl), HB, serum, hemolyzed red blood cell (RBC), plasma, and platelet suspension (PLTs) elicited significant constrictions of isolated basilar arteries. There was a significant increase in K+ concentration in hemolyzed HB (7.02???0.22?mmol/L) compared to Krebs' solution (6.20???0.01?mmol/L). Before HB, acetylcholine (ACh), sodium-nitroprussid (SNP), nifedipin, and CO2 elicited substantial dilations in cerebral arteries. In contrast, in the presence of HB dilations to ACh, SNP decreased, but not to nifedipine and CO2. After washout of HB, nitric oxide?mediated dilations remained significantly reduced compared to control. HB significantly increased the ratiometric Ca signal, which returned to control level after washout. In conclusion, perivascular hemolyzed blood elicits significant?nifedipine and high CO2 reversible?constrictions of isolated BAs and MCAs, primarily by increasing intracellular Ca2+, findings that can contribute to the refinement of local treatment of subarachnoid hemorrhage.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
subarachnoid hemorrhage
in vitro studies
vascular injury
traumatic brain injury
cbf autoregulation
Megjelenés:Journal Of Neurotrauma. - 34 : 2 (2017), p. 529-534. -
További szerzők:Vámos Zoltán Török Orsolya Ivic, Ivan Tóth Attila (1971-) (biológus) Buki András Koller Ákos
Pályázati támogatás:K 108444
OTKA
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4.

001-es BibID:BIBFORM069693
035-os BibID:(cikkazonosító)e0164010 (WOS)000385698100016 (Scopus)84991491986
Első szerző:Cséplő Péter
Cím:The Beta-1-Receptor Blocker Nebivolol Elicits Dilation of Cerebral Arteries by Reducing Smooth Muscle [Ca2+]i / Peter Cseplo, Zoltan Vamos, Ivan Ivic, Orsolya Torok, Attila Toth, Akos Koller
Dátum:2016
ISSN:1932-6203
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:PloS One. - 11 (2016), p. 1-22. -
További szerzők:Vámos Zoltán Ivic, Ivan Török Orsolya Tóth Attila (1971-) (biológus) Koller Ákos
Internet cím:DOI
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5.

001-es BibID:BIBFORM020103
Első szerző:Erdei Nóra (orvos)
Cím:High-fat diet-induced reduction in nitric oxide-dependent arteriolar dilation in rats: role of xanthine oxidase-derived superoxide anion / Nóra Erdei, Attila Tóth, Enikő T. Pásztor, Zoltán Papp, István Édes, Akos Koller, Zsolt Bagi
Dátum:2006
ISSN:0363-6135
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:American Journal Of Physiology-Heart And Circulatory Physiology. - 291 : 5 (2006), p. H2107-H2115. -
További szerzők:Tóth Attila (1971-) (biológus) Pásztorné Tóth Enikő (1966-) (laboratóriumi analitikus) Papp Zoltán (1965-) (kardiológus, élettanász) Édes István (1952-) (kardiológus) Koller Ákos Bagi Zsolt (1974-) (orvos)
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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