http://www.sciencedirect.com/science/article/pii/S0006899313011736
- a Department of Anesthesiology, ShengJing Hospital, China Medical University, Shenyang, China
- b Department of Neurology, The Ninth People's Hospital, Shanghai Jiaotong University, School of medicine, Shanghai, China
- c Department of Anesthesiology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- d Department of Neurobiology, College of Basic Medicine, China Medical University, Shenyang, China
- e Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, School of Medicine, Baltimore, MD, USA
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View full textHighlights
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- Clinical relevant concentration of Isoflurane has neuroprotective effect on neuron.
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- Isoflurane post-conditioning attenuates apoptosis of neurons after OGD/R injury.
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- This effect may be mediated by increases in the expression of Slit2 and Robo1.
Abstract
Different
mechanisms have been suggested to contribute to isoflurane-mediated
neuroprotection. Previous studies have suggested that the protein Slit
can abrogate neuronal death in mixed neuronal–glial cultures exposed to
oxygen–glucose deprivation (OGD) and reperfusion (OGD/R). We
hypothesized that isoflurane increases the expression of Slit and its
receptor Robo when cortical neurons are exposed to OGD/R. To test this
hypothesis, we exposed primary cortical neurons to OGD for 90 min and
reperfusion for 24 h and investigated how isoflurane post-conditioning
affected cell survival and expression of Slit2 and receptors Robo1 and
Robo4. Cell survival increased after administration of isoflurane, as
assessed by the lactate dehydrogenase assay, trypan blue analysis, and
propidium iodide staining. Western blot analysis showed that cleaved
caspase-3 was increased after OGD/R(P<0.01) but reduced by
isoflurane post-conditioning. Real-time PCR and Western blot analysis
showed that the expression levels of Slit2 and Robo1, but not Robo4,
were increased after OGD/R (P<0.5) and increased even further by isoflurane post-conditioning (P<0.01).
Our results suggest that isoflurane post-conditioning markedly
attenuates apoptosis and necrosis of cortical neurons exposed to OGD/R
possibly in part via elevation of Slit2/Robo1 expression. These findings
provide a novel explanation for the pleiotropic effects of isoflurane
that could benefit the central nervous system.
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