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1.

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:BIBFORM020684
Első szerző:Bagi Zsolt (orvos)
Cím:Up-regulation of vascular cyclooxygenase-2 in diabetes mellitus / Zsolt Bagi, Nóra Erdei, Zoltán Papp, István Édes, Akos Koller
Dátum:2006
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Pharmacological reports. - 58 (2006), p. 52-56. -
További szerzők:Erdei Nóra (1979-) (orvos) Papp Zoltán (1965-) (kardiológus, élettanász) Édes István (1952-) (kardiológus) Koller Ákos
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3.

001-es BibID:BIBFORM005623
Első szerző:Bagi Zsolt (orvos)
Cím:High intraluminal pressure via H2O2 upregulates arteriolar constrictions to angiotensin II by increasing the functional availability of AT1 receptors / Bagi, Z., Erdei, N., Koller, A.
Dátum:2008
ISSN:0363-6135 (Print)
Megjegyzések:Previously, we found that high intraluminal pressure leads to production of reactive oxygen species (ROS) and also upregulates several components of the renin-angiotensin system in the wall of small arteries. We hypothesized that acute exposure of arterioles to high intraluminal pressure in vitro via increasing ROS production enhances the functional availability of type 1 angiotensin II (Ang II) receptors (AT1 receptors), resulting in sustained constrictions. In arterioles ( approximately 180 mum) isolated from rat skeletal muscle, Ang II elicited dose-dependent constrictions, which decreased significantly by the second application [maximum (max.): from 59% +/- 4% to 26% +/- 5% at 10(-8) M; P < 0.05] in the presence of 80 mmHg of intraluminal pressure. In contrast, if the arterioles were exposed to high intraluminal pressure (160 mmHg for 30 min), Ang II-induced constrictions remained substantial on the second application (max.: 51% +/- 3% at 10(-8) M). In the presence of Tiron and polyethylene glycol (PEG)-catalase, known to reduce the level of superoxide anion and hydrogen peroxide (H(2)O(2)), second applications of Ang II evoked similarly reduced constrictions, even after high-pressure exposure (29% +/- 4% at 10(-8) M). Furthermore, when arterioles were exposed to H(2)O(2) (for 30 min, 10(-7) M, at normal 80 mmHg pressure), Ang II-induced constrictions remained substantial on second applications (59% +/- 5% at 10(-8) M). These findings suggest that high pressure, likely via inducing H(2)O(2) production, increases the functional availability of AT1 receptors and thus enhances Ang II-induced arteriolar constrictions. We propose that in hypertension-regardless of etiology-high intraluminal pressure, via oxidative stress, enhances the functional availability of AT1 receptors augmenting Ang II-induced constrictions.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
1,2-Dihydroxybenzene-3,5-Disulfonic Acid Disodium Salt/pharmacology
Angiotensin II
Animals
Antioxidants
Arterioles
Blood Pressure
Catalase
Hydrogen Peroxide
Hypertension
Male
Muscle
Oxidative Stress
Polyethylene Glycols
Rats
Rats, Wistar
Receptor
Up-Regulation
Vasoconstriction/drug effects
Megjelenés:American Journal of Physiology. Heart and Circulatory Physiology. - 295 : 2 (2008), p. H835-H841. -
További szerzők:Erdei Nóra (1979-) (orvos) Koller Ákos
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elektronikus változat
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4.

001-es BibID:BIBFORM020691
Első szerző:Erdei Nóra (orvos)
Cím:The levosimendan metabolite OR-1896 elicits vasodilation by activating the KATP and BKCa channels in rat isolated arterioles / Nóra Erdei, Zoltán Papp, Piero Pollesello, István Édes, Zsolt Bagi
Dátum:2006
ISSN:0007-1188
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:British Journal of Pharmacology. - 148 : 5 (2006), p. 696-702. -
További szerzők:Papp Zoltán (1965-) (kardiológus, élettanász) Pollesello, Piero Édes István (1952-) (kardiológus) Bagi Zsolt (1974-) (orvos)
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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)
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6.

001-es BibID:BIBFORM002023
Első szerző:Erdei Nóra (orvos)
Cím:H2O2 increases production of constrictor prostaglandins in smooth muscle leading to enhanced arteriolar tone in Type 2 diabetic mice / Erdei N., Bagi Z., Edes I., Kaley G., Koller A.
Dátum:2007
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:American Journal of Physiology. Heart and Circulatory Physiology. - 292 : 1 (2007), p. H649-H656. -
További szerzők:Édes István (1952-) (kardiológus) Kaley Gábor Koller Ákos Bagi Zsolt (1974-) (orvos)
Internet cím:elektronikus változat
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7.

001-es BibID:BIBFORM074228
Első szerző:Fülöp Tibor (kardiológus)
Cím:Adaptation of Vasomotor Function of Human Coronary Arterioles to the Simultaneous Presence of Obesity and Hypertension / Tibor Fulop, Eva Jebelovszki, Nora Erdei, Tamas Szerafin, Tamas Forster, Istvan Edes, Akos Koller, Zsolt Bagi
Dátum:2007
ISSN:1079-5642
Megjegyzések:Objectives: We hypothesized that simultaneous presence of obesity and hypertension activates adaptive vascular mechanisms affecting dilations of human coronary arterioles.Methods and Results: Agonist-induced dilations were assessed in isolated pressurized coronary arterioles from patients(n 38) who underwent cardiac surgery. Among normotensives we found that dilations to bradykinin (BK) and the NO-donor, sodium-nitroprusside (SNP) were reduced in obese subjects (BK, 10 7 mol/L, lean:90 4%, obese:64 7%; SNP, 10 6 mol/L, lean:89 7%, obese:76 5%). However, among hypertensives, both BK- and SNP-induced dilations were significantly enhanced in obese patients, when compared with lean individuals (BK, lean:71 7%, obese:85 3%; SNP, lean:60 6%, obese:83 2%). Correspondingly, in hypertensive patients, but not in those of normotensives, a positive correlation was found between body mass index (BMI) and BK-induced (P 0.036, r 0.46), and also SNP-evoked (P 0.031, r 0.44) coronary dilations. Moreover, in additional 55 hypertensive patients flow-mediated (FMD) and nitroglycerin (NTG)-induced dilations of the brachial artery were assessed. In obese hypertensive individuals, FMD- and NTG-induced dilations were greater (FMD:6.2 0.7%, NTG:17.2 0.9%), than in leanhypertensive patients (FMD:3.7 0.6%, NTG:13.6 1.1%). Correspondingly, FMD- and NTG-induced dilations were positively correlated with BMI (P 0.020, r 0.31 and P 0.033, r 0.29, respectively).Conclusions:These findings are the first to suggest that obesity may lead to activation of adaptive vascular mechanisms to enhance the dilator function of coronary and peripheral arterial vessels in hypertensive patients. (Arterioscler Thromb Vasc Biol. 2007;27:2348-2354.)
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
obesity
hypertension
coronary microcirculation
flow-mediated dilation
nitrate
Megjelenés:Arteriosclerosis Thrombosis And Vascular Biology. - 27 : 11 (2007), p. 2348-2354. -
További szerzők:Jebelovszki Éva Erdei Nóra (1979-) (orvos) Szerafin Tamás (1960-) (szívsebész, mellkassebész) Forster Tamás Édes István (1952-) (kardiológus) Koller Ákos Bagi Zsolt (1974-) (orvos)
Pályázati támogatás:F-048837
OTKA
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8.

001-es BibID:BIBFORM005634
Első szerző:Jebelovszki Éva
Cím:High-fat diet-induced obesity leads to increased NO sensitivity of rat coronary arterioles : role of soluble guanylate cyclase activation / Jebelovszki, E., Kiraly, C., Erdei, N., Feher, A., Pasztor, T. E., Rutkai, I., Forster, T., Edes, I., Koller, A., Bagi, Z.
Dátum:2008
ISSN:0363-6135 (Print)
Megjegyzések:The impact of obesity on nitric oxide (NO)-mediated coronary microvascular responses is poorly understood. Thus NO-mediated vasomotor responses were investigated in pressurized coronary arterioles ( approximately 100 microm) isolated from lean (on normal diet) and obese (fed with 60% of saturated fat) rats. We found that dilations to acetylcholine (ACh) were not significantly different in obese and lean rats (lean, 83 +/- 4%; and obese, 85 +/- 3% at 1 microM), yet the inhibition of NO synthesis with N(omega)-nitro-l-arginine methyl ester reduced ACh-induced dilations only in vessels of lean controls. The presence of the soluble guanylate cyclase (sGC) inhibitor oxadiazolo-quinoxaline (ODQ) elicited a similar reduction in ACh-induced dilations in the two groups of vessels (lean, 60 +/- 11%; and obese, 57 +/- 3%). Dilations to NO donors, sodium nitroprusside (SNP), and diethylenetriamine (DETA)-NONOate were enhanced in coronary arterioles of obese compared with lean control rats (lean, 63 +/- 6% and 51 +/- 5%; and obese, 78 +/- 5% and 70 +/- 5%, respectively, at 1 microM), whereas dilations to 8-bromo-cGMP were not different in the two groups. In the presence of ODQ, both SNP and DETA-NONOate-induced dilations were reduced to a similar level in lean and obese rats. Moreover, SNP-stimulated cGMP immunoreactivity in coronary arterioles and also cGMP levels in carotid arteries were enhanced in obese rats, whereas the protein expression of endothelial NOS and the sGC beta1-subunit were not different in the two groups. Collectively, these findings suggest that in coronary arterioles of obese rats, the increased activity of sGC leads to an enhanced sensitivity to NO, which may contribute to the maintenance of NO-mediated dilations and coronary perfusion in obesity.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Acetylcholine
Adaptation, Physiological
Animals
Arterioles
Blotting, Western
Coronary Vessels
Cyclic GMP
Dietary Fats
Disease Models, Animal
Dose-Response Relationship, Drug
Enzyme Activation
Enzyme Inhibitors
Enzyme-Linked Immunosorbent Assay
Guanylate Cyclase
Immunohistochemistry
Male
NG-Nitroarginine Methyl Ester
Nitric Oxide
Nitric Oxide Donors
Nitric Oxide Synthase Type II
Nitroprusside
Nitroso Compounds
Obesity
Rats
Rats, Wistar
Receptors, Cytoplasmic and Nuclear
Vasodilation
Vasodilator Agents
Megjelenés:American Journal of Physiology. Heart and Circulatory Physiology. - 294 : 6 (2008), p. H2558-H2564. -
További szerzők:Király Csaba Erdei Nóra (1979-) (orvos) Fehér Attila (1982-) (orvos) Pásztorné Tóth Enikő (1966-) (laboratóriumi analitikus) Rutkai Ibolya (1985-) (molekuláris biológus) Forster Tamás Édes István (1952-) (kardiológus) Koller Ákos Bagi Zsolt (1974-) (orvos)
Internet cím:elektronikus változat
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9.

001-es BibID:BIBFORM003870
Első szerző:Kark Tamás (orvos)
Cím:Tissue-specific regulation of microvascular diameter : opposite functional roles of neuronal and smooth muscle located vanilloid receptor-1 / Tamás Kark, Zsolt Bagi, Erzsébet Lizanecz, Enikő T. Pásztor, Nóra Erdei, Ágnes Czikora, Zoltán Papp, István Édes, Róbert Pórszász, Attila Tóth
Dátum:2008
Megjegyzések:The transient receptor potential type V1 channel (vanilloid receptor 1, TRPV1) is a Ca2+ -permeable nonspecific cation channel activated by various painful stimuli including ischemia. We hypothesized that TRPV1 is expressed in the arterioles and is involved in the regulation of microvascular tone. We found that TRPV1 stimulation by capsaicin (intra-arterial administration) of the isolated, perfused right hind limb of the rat increased vascular resistance (by 98 ± 21 mm Hg at 10 gamma g) in association with decreased skeletal muscle perfusion and elevation of skin perfusion (detected by dual-channel laser Doppler flowmetry). Denervation of the hind limb did not affect capsaicin-evoked changes in vascular resistance and tissue perfusion in the hind limb but reduced the elevation of perfusion in the skin. In isolated, pressurized skeletal (musculus gracilis) muscle arterioles (diameter, 147 ± 35 gamma m), capsaicin had biphasic effects: at lowe concentrations, capsaicin (up to 10 nM) evoked dilations (maximum, 32 ± 13%), whereas higher concentrations (0.1-1 gamma M) elicited substantial constrictions (maximum, 66 ± 7%). Endothelium removal or inhibition of nitric-oxide synthase abolished capsaicin-induced dilations but did not affect arteriolar constriction. Expression of TRPV1 was detected by reverse transcriptase-polymerase chain reaction in the aorta and in cultured rat aortic vascular smooth muscle cells (A7r5). Immunohistochemistry revealed expression primarily in the smooth muscle layers of the gracilis arteriole. These data demonstrate the functional expression of TRPV1 in vascular smooth muscle cells mediating vasoconstriction of the resistance arteries. Because of the dual effects of TRPV1 stimulation on the arteriolar diameter (dilation in skin, constriction in skeletal muscle), we propose that TRPV1 ligands represent drug candidates for tissue-specific modulation of blood distribution.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
TRPV1
CGRP
calcitonin gene-related peptide
SP
Megjelenés:Molecular Pharmacology. - 73 : 5 (2008), p. 1405-1412. -
További szerzők:Bagi Zsolt (1974-) (orvos) Lizanecz Erzsébet (1978-) (orvos) Pásztorné Tóth Enikő (1966-) (laboratóriumi analitikus) Erdei Nóra (1979-) (orvos) Czikora Ágnes (1982-) (molekuláris biológus) Papp Zoltán (1965-) (kardiológus, élettanász) Édes István (1952-) (kardiológus) Pórszász Róbert (1965-) (farmakológus, klinikai farmakológus) Tóth Attila (1971-) (biológus)
Internet cím:elektronikus változat
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10.

001-es BibID:BIBFORM099972
Első szerző:Rácz A.
Cím:Thromboxane A2 Contributes to the Mediation of Flow-Induced Responses of Skeletal Muscle Venules : role of Cyclooxygenases 1 and 2 / Racz A., Veresh Z., Erdei N., Bagi Z., Koller A.
Dátum:2009
ISSN:1018-1172
Megjegyzések:Background: It has been shown that increases in intraluminal flow elicit dilation in venules, but the mediation of response is not yet clarified. We hypothesized that - in addition to nitric oxide (NO) and dilator prostaglandins (PGI(2)/ PGE(2)) - thromboxane A(2) (TxA(2)) contributes to the mediation of flow-induced responses of venules. Methods and results: Isolated rat gracilis muscle venules (259 +/- 11 microm at 10 mm Hg) dilated as a function of intraluminal flow, which was augmented in the presence of the TxA(2) receptor antagonist SQ 29,548 or the TxA(2) synthase inhibitor ozagrel. In the presence of SQ 29,548, indomethacin or Nomega-nitro-L-arginine methyl-ester decreased flow-induced dilations, whereas in their simultaneous presence dilations were abolished. The selective cyclooxygenase (COX) 1 inhibitor SC 560 reduced, whereas the selective COX-2 inhibitor NS 398 enhanced flow-induced dilations. Immunohistochemistry showed that both COX-1 and COX-2 are present in the wall of venules. Conclusion: In skeletal muscle venules, increases in intraluminal flow elicit production of constrictor TxA(2), in addition to the dilator NO and PGI(2)/PGE(2), with an overall effect of limited dilation. These mediators are likely to have important roles in the multiple feedback regulation of wall shear stress in venules during changes in blood flow velocity and/or viscosity.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Venule
Shear stress
Nitric oxide
Prostaglandins
Cyclooxygenases 1 and 2
Thromboxane A 2 synthase
Megjelenés:Journal Of Vascular Research. - 46 : 5 (2009), p. 397-405. -
További szerzők:Veresh Zoltán Erdei Nóra (1979-) (orvos) Bagi Zsolt (1974-) (orvos) Koller Ákos
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11.

001-es BibID:BIBFORM018436
Első szerző:Rutkai Ibolya (molekuláris biológus)
Cím:Activation of prostaglandin E2 EP1 receptor increases arteriolar tone and blood pressure in mice with type 2 diabetes / Rutkai, I., Feher, A., Erdei, N., Henrion, D., Papp, Z., Edes, I., Koller, A., Kaley, G., Bagi, Z.
Dátum:2009
ISSN:0008-6363
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
diabetes
hypertension
arteriole
prostanoid
EP receptor
Megjelenés:Cardiovascular Research. - 83 : 1 (2009), p. 148-154. -
További szerzők:Fehér Attila (1982-) (orvos) Erdei Nóra (1979-) (orvos) Henrion, Daniel Papp Zoltán (1965-) (kardiológus, élettanász) Édes István (1952-) (kardiológus) Koller Ákos Kaley Gábor Bagi Zsolt (1974-) (orvos)
Pályázati támogatás:449/2006
OTKA
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Intézményi repozitóriumban (DEA) tárolt változat
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12.

001-es BibID:BIBFORM018115
Első szerző:Szerafin Tamás (szívsebész, mellkassebész)
Cím:Increased cyclooxygenase-2 expression and prostaglandin-mediated dilation in coronary arterioles of patients with diabetes mellitus / Szerafin T., Erdei N., Fülöp T., Pasztor T. E., Edes I., Koller A., Bagi Z.
Dátum:2006
ISSN:0009-7330
Megjegyzések:Based on findings of experimental models of diabetes mellitus (DM) showing increased expression of vascular cyclooxygenase-2 (COX-2), we hypothesized that in patients with DM changes in COX-2-dependent prostaglandin synthesis affect vasomotor responses of coronary arterioles. Arterioles were dissected from the right atrial appendages obtained at the time of cardiac surgery of patient with DM(+) or without documented diabetes DM(-). Isolated arterioles (89+/-15 microm in diameter) were cannulated and pressurized (at 80 mm Hg), and changes in diameter were measured with video microscopy. After spontaneous tone developed [DM(-): 32+/-7%; DM(+): 37+/-5%; P=NS], arteriolar responses to bradykinin were investigated. Dilations to bradykinin (0.1 nmol/L to 1 micromol/L) were significantly (P<0.05) greater in DM(+) than DM(-) patients (10 nmol/L: 77+/-10% versus 38+/-14%). In both groups, dilations were similar to the NO-donor, sodium nitroprusside. In arterioles of DM(+), but not those of DM(-), patients' bradykinin-induced dilations were reduced by the nonselective COX inhibitor indomethacin or by the selective COX-2 inhibitor NS-398 (DM(+) at 10 nmol/L: to 20+/-4% and 29+/-7%, respectively). Correspondingly, a marked COX-2 immunostaining was detected in coronary arterioles of DM(+), but not in those of DM(-) patients. We conclude that in coronary arterioles of diabetic patients bradykinin induces enhanced COX-2-derived prostaglandin-mediated dilation. These findings are the first to show that in humans diabetes mellitus increases COX-2 expression and dilator prostaglandin synthesis in coronary arterioles, which may serve to increase dilator capacity and maintain adequate perfusion of cardiac tissues.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Circulation Research. - 99 : 5 (2006), p. e12-e17. -
További szerzők:Erdei Nóra (1979-) (orvos) Fülöp Tibor (1957-) (kardiológus) Pásztorné Tóth Enikő (1966-) (laboratóriumi analitikus) Édes István (1952-) (kardiológus) Koller Ákos Bagi Zsolt (1974-) (orvos)
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