Brain Topography

, Volume 28, Issue 6, pp 879–894 | Cite as

Effects of Hydrogen Sulfide on Modulation of Theta–Gamma Coupling in Hippocampus in Vascular Dementia Rats

Original Paper

Abstract

Our previous study showed that hydrogen sulfide (H2S) could alleviate the cognitive deficits in vascular dementia (VD) rats associated with the improvement of synaptic plasticity. Neural oscillations are reported to interact with each other through either identical-frequency or cross-frequency coupling. This study examined whether impaired neural couplings could be alleviated by H2S in the hippocampal CA3–CA1 of VD rats and explored its possible mechanism. A VD rat model was established by two-vessel occlusion. Sodium hydrosulfide (NaHS), a kind of H2S donor, was administered intraperitoneally (5.6 mg/kg/day) for 3 weeks. Local field potentials were simultaneously collected in the hippocampal CA3 and CA1. The effects of NaHS on the modulation of theta–gamma coupling were evaluated by using the measurements of both phase–phase coupling and phase–amplitude coupling, while several other approaches including behavior, electrophysiology, western blot, immunofluorescence staining were also employed. The results showed that NaHS significantly prevented spatial learning and memory impairments (p < 0.01). NaHS considerably alleviated the impairment of neural coupling in VD rats in an identical-frequency rhythm and between cross-frequency bands. Moreover, the expression of cystathionine-β-synthase (CBS) was markedly attenuated in VD rats. NaHS elevated the expression of CBS to maintain the intrinsic balance of H2S. Interestingly, it was observed that NaHS increased the protein expression of N-methyl-d-aspartic acid receptor 2A (NMDAR2A) in VD rats. In conclusion, the data suggest that NaHS played the neuroprotective role partly via modulating the expression of NMDAR2A in order to alleviate the impairments of neural couplings in VD rats.

Keywords

Theta Gamma Vascular dementia Hydrogen sulfide Identical frequency coupling Cross frequency coupling 

Abbreviations

CFC

Cross frequency coupling

CMI

Conditional mutual information

fEPSP

Field excitatory postsynaptic potential

H2S

Hydrogen sulfide

NaHS

Sodium hydrosulfide

LFP

Local field potential

LTP

Long term potentiation

MWM

Morris water maze

MI

Modulation index

NMDAR

N-methyl-d-aspartic acid receptor

PAC

Phase–amplitude coupling

PAC–CMI

Phase–amplitude coupling–conditional mutual information

PAC–PLV

Phase–amplitude coupling–phase locking value

PLV

Phase locking value

VD

Vascular dementia

2VO

Two vessel occlusion

PPC

Phase–phase coupling

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Xiaxia Xu
    • 1
  • Chunhua Liu
    • 2
  • Zhanyong Li
    • 1
  • Tao Zhang
    • 1
  1. 1.College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of EducationNankai UniversityTianjinPeople’s Republic of China
  2. 2.College of Medicine ScienceNankai UniversityTianjinPeople’s Republic of China

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