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Titolo:
Neuroprotection of S(+) ketamine isomer in global forebrain ischemia
Autore:
Proescholdt, M; Heimann, A; Kempski, O;
Indirizzi:
Univ Mainz, Inst Neurosurg Pathophysiol, Mainz, Germany Univ Mainz MainzGermany z, Inst Neurosurg Pathophysiol, Mainz, Germany
Titolo Testata:
BRAIN RESEARCH
fascicolo: 2, volume: 904, anno: 2001,
pagine: 245 - 251
SICI:
0006-8993(20010622)904:2<245:NOSKII>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHYL-D-ASPARTATE; CEREBRAL BLOOD-FLOW; REGIONAL GLUCOSE-UTILIZATION; RAT HIPPOCAMPUS; OPTICAL ISOMERS; BRAIN-DAMAGE; AMINO-ACIDS; PHARMACOLOGY; ANTAGONISTS; ANESTHESIA;
Keywords:
glutamate; laser-doppler flowmetry; oxygenation; histology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Kempski, O Univ Mainz, Inst Neurosurg Pathophysiol, Mainz, Germany Univ Mainz Mainz Germany rosurg Pathophysiol, Mainz, Germany
Citazione:
M. Proescholdt et al., "Neuroprotection of S(+) ketamine isomer in global forebrain ischemia", BRAIN RES, 904(2), 2001, pp. 245-251

Abstract

dThe non-competitive N-methyl-D-aspartate (NMDA) receptor antagonist ketamine can block the action of excitotoxic amino acids in the central nervous system. S(+) ketamine has a 2-3 times higher anesthetic potency compared with the ketamine-racemate and also shows a higher neuroprotective efficacy in vitro. To determine the neuroprotective activity of S(+) ketamine compared with its R(-) stereoisomer in vivo, we examined the functional and neurohistological outcome in rats treated 15 min after global forebrain ischemia with S(+) ketamine in different dosages compared with R(-) ketamine. Influence of the treatment on regional cerebral blood flow (rCBF) and cortical oxygen saturation (HbO(2)) was monitored over 1 h after the ischemia using laser doppler flowmetry and microphotospectrometry respectively. Sixty and ninety mg/kg of S(+) ketamine but not R(-) ketamine significantly reduced neuronal cell loss in the cortex compared with the saline treated group. No significant neuroprotection was observed in the hippocampus. Although no significant change in rCBF was found, S(S) ketamine restored the cortical HbO(2) to preischemic values. These results indicate that S(+) ketamine in higher dosages can reduce neuronal damage in the cortex after cerebral ischemia,possibly by improving the ratio of oxygen supply to consumption in the postischemic tissue. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:11:41