Abstract
The purpose of this study was to determine whether the antibiotic erythromycin induces tolerance against focal cerebral ischemia, and the possible underlying mechanism including the involvement of neuronal nitric oxide synthase (nNOS) and hypoxia-inducible factor-1α (HIF-1α). In rat focal cerebral ischemia models, we found that erythromycin preconditioning could significantly decrease the cerebral infarct volume and brain edema. Meanwhile, the neurological deficits from day 4 through 7 after surgery were also remarkably decreased after erythromycin preconditioning. Moreover, erythromycin preconditioning induced significantly increased nNOS levels and decreased HIF-1α levels in both mRNA and protein expression. This study for the first time indicated that erythromycin preconditioning could induce focal brain ischemic tolerance and attenuate brain injury of subsequent transient focal cerebral ischemia. The potential mechanism may be due to up-regulation of nNOS, but the HIF-1α system was not involved.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (No. 30400463), the Natural Science Foundation of Liaoning Province (No. 20072099, No. 2013021075), and Technology Plan Project of Educational Department of Liaoning Province (No. 2006401013-3), Science and Technology Plan Project of Liaoning Province (No. 2012225070, No. 20131114).
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The authors declare that there are no conflicts of interest.
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W. Lu and G. Li are the first two authors who contributed equally to this work.
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Lu, Wc., Li, Gy., Xie, H. et al. Erythromycin pretreatment induces tolerance against focal cerebral ischemia through up-regulation of nNOS but not down-regulation of HIF-1α in rats. Neurol Sci 35, 687–693 (2014). https://doi.org/10.1007/s10072-013-1584-5
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DOI: https://doi.org/10.1007/s10072-013-1584-5