Auricular transcutaneous vagus nerve stimulation improves memory persistence in naive mice and in an intellectual disability mouse model

Background: Vagus nerve stimulation (VNS) using non-invasive approaches have attracted great attention due to their anti-epileptic, anti-depressive and pro-cognitive effects. It has been proposed that auricular transcutaneous VNS (atVNS) could benefit intellectual disability disorders, but preclinical data supporting this idea is limited. Objective: To develop an atVNS device for mice and to test its efficacy on memory performance in naive mice and in a mouse model for intellectual disability. Methods: Naive outbreed CD-1 mice and a model for fragile X syndrome, the Fmr1 knockout (Fmr1KO), were used to assess the effect of atVNS in the novel object-recognition memory performance. Results: We found that atVNS significantly improves memory persistence in naive mice. Notably, atVNS was efficacious in normalizing the object-recognition memory deficit in the Fmr1KO model. Conclusion: Our data show that atVNS improves memory persistence in naive mice and in a model of intellectual disability and support further studies taking advantage of preclinical mouse models of cognitive disorders. (C) 2019 The Author(s). Published by Elsevier Inc.