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001-es BibID:	BIBFORM046506
Első szerző:	Ferdinándy Péter
Cím:	Loss of pacing-induced preconditioning in rat hearts : role of nitric oxide and cholesterol-enriched diet / Peter Ferdinandy, Zoltan Szilvassy, Laszlo I. Horvath, Tamas Csont, Csaba Csonka, Erzsebet Nagy, Reka Szentgyorgyi, Istvan Nagy, Matyas Koltai, Laszlo Dux
Dátum:	1997
ISSN:	0022-2828
Megjegyzések:	We examined whether the inhibition ofnitric oxide (NO) synthesis by NG-nitro-L-arginine (LNNA) abolished pacing-induced preconditioning, and ifprolonged exposure to cholesterol-enriched diet led to the loss of preconditioning due to decreased cardiac NOformation. Therefore, Wistar rats fed 2% cholesterol-enriched diet or standard diet for 24 weeks were treatedwith a single dose of 1 mg/kg LNNA or its solvent at the end of the week 24, respectively. Isolated hearts fromall groups were subjected to either preconditioning induced by three consecutive periods of pacing at 600 beats/min for 5 min, with 5-min interpacing periods, or time-matched non-preconditioning perfusion, followed by a10-min coronary occlusion, respectively. In the control group, coronary occlusion after a non-preconditioningprotocol decreased aortic flow (AF) from 45.4?2.4 to 15.6?1.5 ml/min, and resulted in a lactate dehydrogenase(LDH) release of 219?55 mU/min/g, however, preconditioning attenuated the consequences of coronary occlusion[AF: 27.3?1.7 ml/min (P<0.05); LDH: 44?14 mU/min/g (P<0.05)]. Preconditioning did not confer protectionin the LNNA-treated (AF: 17.4?1.5 ml/min; LDH: 151?21 mU/min/g), and/or in the high-cholesterol-fed groups(AF: 15.7?1.2 ml/min; LDH: 168?22 mU/min/g). Preconditioning was preserved however, when hearts weretreated with LNNA after the preconditioning protocol [AF: 29.6?2.2 ml/min (P<0.05); LDH: 48?17 mU/min/g (P<0.05)]. Both LNNA treatment and cholesterol-enriched diet markedly decreased cardiac NO content assayedby electron spin resonance spectroscopy. We conclude that NO may be involved in the triggering mechanism ofpacing-induced preconditioning, the protective effect of which is blocked by sustained exposure to dietarycholesterol, possibly by influencing cardiac metabolism of NO.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Pacing-induced Nitric Oxide NO LNNA
Megjelenés:	Journal of Molecular and Cellular Cardiology. - 29 : 12 (1997), p. 3321-3333. -
További szerzők:	Szilvássy Zoltán (1957-) (belgyógyász, farmakológus, klinikai farmakológus) Horváth László I. Csont Tamás Csonka Csaba Nagy Erzsébet (Szeged) Szentgyörgyi Réka Nagy István Koltai Mátyás Dux László
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