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001-es BibID:	BIBFORM029129
Első szerző:	Beleznai Tímea (orvos)
Cím:	Arginase 1 contributes to diminished coronary arteriolar dilation in patients with diabetes / Beleznai T., Feher A., Spielvogel D., Lansman S. L., Bagi Z.
Dátum:	2011
ISSN:	0363-6135
Megjegyzések:	Arginase 1, via competing with nitric oxide (NO) synthase for the substrate L-arginine, may interfere with NO-mediated vascular responses. We tested the hypothesis that arginase 1 contributes to coronary vasomotor dysfunction in patients with diabetes mellitus (DM). Coronary arterioles were dissected from the right atrial appendages of 41 consecutive patients with or without DM (the 2 groups suffered from similar comorbidities), and agonist-induced changes in diameter were measured with videomicroscopy. We found that the endothelium-dependent agonist ACh elicited a diminished vasodilation and caused constriction to the highest ACh concentration (0.1 mikroM) with a similar magnitude in patients with (18 ± 8%) and without (17 ± 9%) DM. Responses to ACh were not significantly affected by the inhibition of NO synthesis with N(G)-nitro-L-arginine methyl ester in either group. The NO donor sodium nitroprusside-dependent dilations were not different in patients with or without DM. Interestingly, we found that the presence of N(G)-hydroxy-L-arginine (10 mikroM), a selective inhibitor of arginase or application of L-arginine (3 mM), restored ACh-induced coronary dilations only in patients with DM (to 47 ± 6% and to 40 ± 19%, respectively) but not in subjects without DM. Correspondingly, the protein expression of arginase 1 was increased in coronary arterioles of patients with DM compared with subjects without diabetes. Moreover, using immunocytochemistry, we detected an abundant immunostaining of arginase 1 in coronary endothelial cells of patients with DM, which was colocalized with NO synthase. Collectively, we provided evidence for a distinct upregulation of arginase 1 in coronary arterioles of patients with DM, which contributes to a reduced NO production and consequently diminished vasodilation.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	American Journal Of Physiology-Heart And Circulatory Physiology. - 300 : 3 (2011), p. H777-H783. -
További szerzők:	Fehér Attila (1982-) (orvos) Spielvogel, David Lansman, Steven L. Bagi Zsolt (1974-) (orvos)
Pályázati támogatás:	RE/08/004 Egyéb
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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