Advances in Clinical and Experimental Medicine

Title abbreviation: Adv Clin Exp Med
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ISSN 1899–5276 (print)
ISSN 2451-2680 (online)
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Advances in Clinical and Experimental Medicine

2020, vol. 29, nr 6, June, p. 695–700

doi: 10.17219/acem/121944

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

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Isoflurane cerebral preconditioning in a spontaneous hypertension rat model is associated with sphingosine kinases

Jun Ge1,2,B,C,D,E,F, Keyu Kong1,2,B,C,D,E,F, Xiaoqiang Cheng1,2,B,C,E,F, Tianyi Wu2,B,D,F, Dingge Liu2,B,D,F, Lingling Peng2,B,D,F, Zhijia Shen2,B,D,F, Guoyuan Lu3,A,F, Yanping Shen3,A,C,E,F

1 Department of Surgery, First Affiliated Hospital of Soochow University, Suzhou, China

2 Medical College, Soochow University, Suzhou, China

3 Department of Nephrology, First Affiliated Hospital of Soochow University, Suzhou, China

Abstract

Background. Isoflurane preconditioning could reduce different kinds of brain injury via sphingosine kinase (SPK). Both sphingosine kinase 1 and sphingosine kinase 2 play important roles in brain protection. However, the effects of isoflurane preconditioning on SPK expression in hypertension have not been investigated before.
Objectives. To verify whether the neuroprotective effects of the anesthetic isoflurane after an ischemic injury are altered in hypertension and to identify its possible mechanisms involving SPK.
Material and Methods. Wistar rats (control) and spontaneous hypertension rats (SHR) were exposed to isoflurane preconditioning before transient middle cerebral artery occlusion. The infarct volumes of cortical and subcortical brain areas were measured. The expression levels of SPK1 and SPK2 were measured before and after isoflurane preconditioning.
Results. In the SHR group, isoflurane preconditioning significantly reduced only the infarct volumes of the subcortical brain (p < 0.05), not of the cortical brain. After 3 h of isoflurane exposure and preconditioning, SPK2 levels in the SHR group increased in the cortical brain (p < 0.05), but not in the subcortical brain area, Unlike in the control group, isoflurane exposure and preconditioning could significantly increase SPK2 levels in both cortical and subcortical brain area.
Conclusion. The brain protection effects induced by isoflurane preconditioning after an ischemic injury are mainly mediated by the SPK2 isoform and are somewhat impaired in hypertension. Attention should be paid to ischemic injury patients with hypertension.

Key words

cerebral preconditioning, isoflurane, hypertension, brain ischemic injury

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