Format

Send to

Choose Destination
Brain Stimul. 2015 Jan-Feb;8(1):13-20. doi: 10.1016/j.brs.2014.09.013. Epub 2014 Sep 28.

Vagus nerve stimulation has antidepressant effects in the kainic acid model for temporal lobe epilepsy.

Author information

1
Laboratory for Clinical and Experimental Neurophysiology, Neurobiology and Neuropsychology (LCEN3), Ghent University, Department of Neurology, Institute for Neuroscience, Ghent, Belgium. Electronic address: Annelies.Grimonprez@ugent.be.
2
Laboratory for Clinical and Experimental Neurophysiology, Neurobiology and Neuropsychology (LCEN3), Ghent University, Department of Neurology, Institute for Neuroscience, Ghent, Belgium.
3
Swammerdam Institute of Life Sciences, Department of Neurobiology, University of Amsterdam, The Netherlands.

Abstract

BACKGROUND:

Depression is the most common psychiatric comorbidity in epilepsy patients. The lack of success with current pharmacological interventions for this patient population, highlights the importance of optimizing non-pharmacological neuromodulatory treatments such as vagus nerve stimulation (VNS). Studies on the antidepressant effect of VNS in epilepsy patients may be confounded by concurrent anti-epileptic drug therapy. To date, studies in epilepsy models overcoming this problem are lacking.

OBJECTIVE:

We investigated whether VNS affects anhedonia, a key symptom of major depression, in the kainic acid rat model for temporal lobe epilepsy.

METHODS:

Anhedonia was assessed in kainic acid (KA) and saline (SAL) injected rats using the saccharin preference test (SPT). To exclude differences in taste perception, the quinine aversion test (QAT) was performed. Both groups were randomly subdivided in a VNS and a SHAM group, yielding 4 experimental arms: KA-VNS, KA-SHAM, SAL-VNS and SAL-SHAM. Both VNS groups received 2 weeks of VNS, while the SHAM groups were not stimulated. Thereafter, the SPT and QAT were repeated.

RESULTS:

Saccharin preference was significantly reduced in the KA compared to the SAL rats (P < 0.05), without differences in quinine aversion. Two weeks of VNS significantly increased the saccharin preference in the KA-VNS group (P < 0.05), while it had no effect on quinine aversion. No effects of VNS or SHAM were found in the other groups.

CONCLUSION:

The KA rats displayed anhedonia which was significantly decreased by VNS, indicating that this neuromodulatory treatment could likewise diminish depressive symptoms in patients suffering from temporal lobe epilepsy and comorbid depression.

KEYWORDS:

Anhedonia; Depression; Kainic acid model; Temporal lobe epilepsy; Vagus nerve stimulation

PMID:
25444592
DOI:
10.1016/j.brs.2014.09.013
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center