Molecular Neurobiology

, Volume 50, Issue 3, pp 937–944

Epigenetic Enhancement of Brain-Derived Neurotrophic Factor Signaling Pathway Improves Cognitive Impairments Induced by Isoflurane Exposure in Aged Rats

Authors

  • MuHuo Ji
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • Lin Dong
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • Min Jia
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • WenXue Liu
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • MingQiang Zhang
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • LinSha Ju
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • JiaoJiao Yang
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
  • Zhongcong Xie
    • Geriatric Anesthesia Research Unit, Department of Anesthesia, Critical Care and Pain MedicineMassachusetts General Hospital and Harvard Medical School
    • Department of Anesthesiology, Jinling Hospital, School of MedicineNanjing University
Article

DOI: 10.1007/s12035-014-8659-z

Cite this article as:
Ji, M., Dong, L., Jia, M. et al. Mol Neurobiol (2014) 50: 937. doi:10.1007/s12035-014-8659-z

Abstract

Isoflurane-induced cognitive impairments are well documented in animal models; yet, the molecular mechanisms remain largely to be determined. In the present study, 22-month-old male Sprague-Dawley rats received 2 h of 1.5 % isoflurane or 100 % oxygen daily for 3 consecutive days. For the intervention study, the rats were intraperitoneally injected with 1.2 g/kg sodium butyrate 2 h before isoflurane exposure. Our data showed that repeated isoflurane exposure significantly decreased the freezing time to context and the freezing time to tone in the fear conditioning test, which was associated with upregulated histone deacetylase 2, reduced histone acetylation, and increased inflammation and apoptosis in the hippocampus, and impairments of brain-derived neurotrophic factor (BDNF)-tyrosine kinase receptor B (TrkB) and the downstream signaling pathway phospho-calmodulin-dependent protein kinase and phospho-cAMP response element-binding protein. These results suggest that isoflurane-induced cognitive impairments are associated with the declines in chromatin histone acetylation and the resulting downregulation of BDNF-TrkB signaling pathway. Moreover, the cognitive impairments and the signaling deficits can be rescued by histone deacetylase inhibitor sodium butyrate. Therefore, epigenetic enhancement of BDNF-TrkB signaling may be a promising strategy for reversing isoflurane-induced cognitive impairments.

Keywords

CognitionHistone acetylationBrain-derived neurotrophic factorInflammationApoptosis

Copyright information

© Springer Science+Business Media New York 2014