Chinese Medical Sciences Journal ›› 2011, Vol. 26 ›› Issue (1): 36-42.doi: 10.1016/S1001-9294(11)60017-5

• Original Article • Previous Articles     Next Articles

Dual Isoflurane-induced Preconditioning Improves Neuroprotection in Rat Brain In Vitro and the Role of Extracellular Signal–regulated Protein Kinase

Sheng Wang1, Su-xiang Guo1, Zhi-gang Dai1, Xi-wei Dong1, Yang Liu1, Shan Jiang2, and Zhi-ping Wang2   

  1. 1Department of Anesthesiology, Affiliated Hospital of Shihezi Medical School , Shihezi University , Shihezi 832008, China 2 Anesthesiology Key Laboratory of Jiangsu Province , Xuzhou , 221002, China 221002, China
  • Received:2010-06-07 Revised:2011-04-18 Online:2011-04-18 Published:2011-04-18
  • Contact: Sheng Wang E-mail:iamsheng2006@163.com
  • About author:Tel: 86-993-2862150, Fax: 86-993-2858664
  • Supported by:

    Foundation of Shihezi University of Xinjiang Province (RCZX200688)

Abstract: Objective To test the ability of isoflurane-induced preconditioning against oxygen and glucose deprivation (OGD) injury in vitro. Methods Rat hippocampal slices were exposed to 1 volume percentage (vol%), 2vol% or 3vol% isoflurane respectively for 20 minutes under normoxic conditions (95% O2/5% CO2) once or twice (12 slices in each group) before OGD, with 15-minute washout after each exposure. During OGD experiments, hippocampus slices were bathed with artificial cerebrospinal fluid (ACSF) lacking glucose and perfused with 95% N2 and 5% CO2 for 14 minutes, followed by a 30-minute reperfusion in normal ACSF. The CA1 population spike (PS) was measured and used to quantify the degree of neuronal function recovery after OGD. To assess the role of mitogen-activated protein kinases (MAPKs) in isoflurane preconditioning, U0126, an inhibitor of extracellular signal-regulated protein kinase (ERK1/2), and SB203580, an inhibitor of p38 MAPK, were used before two periods of 3vol% isoflurane exposure. Results The degree of neuronal function recovery of hippocampal slices exposed to 1vol%, 2vol%, or 3vol% isoflurane once was 41.88%±9.23%, 55.05%±11.02%, or 63.18%±10.82% respectively. Moreover, neuronal function recovery of hippocampal slices exposed to 1vol%, 2vol%, or 3vol% isoflurane twice was 53.75%±12.04%, 63.50%±11.06%, or 76.25%±12.25%, respectively. Isoflurane preconditioning increased the neuronal function recovery in a dose-dependent manner. U0126 blocked the preconditioning induced by dual exposure to 3vol% isoflurane (6.13%±1.56%, P<0.01) and ERK1/2 activities. Conclusions Isoflurane is capable of inducing preconditioning in hippocampal slices in vitro in a dose-dependent manner, and dual exposure to isoflurane with a lower concentration is more effective in triggering preconditioning than a single exposure. Isoflurane-induced neuroprotection might be involved with ERK1/2 activities.

Key words: electrophysiology, hippocampal slice, isoflurane, preconditioning, oxygen and glucose deprivation, mitogen-activatedprotein kinase

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