| First Author | Moretti J | Year | 2021 |
| Journal | Behav Brain Res | Volume | 400 |
| Pages | 113011 | PubMed ID | 33181182 |
| Mgi Jnum | J:307362 | Mgi Id | MGI:6712232 |
| Doi | 10.1016/j.bbr.2020.113011 | Citation | Moretti J, et al. (2021) Concurrent LI-rTMS induces changes in c-Fos expression but not behavior during a progressive ratio task with adult ephrin-A2A5(-/-) mice. Behav Brain Res 400:113011 |
| abstractText | Changes within the dopaminergic system induced by repetitive transcranial magnetic stimulation (rTMS) may contribute to its therapeutic effects; however, dopamine-related behavioral effects of rTMS have not been widely investigated. We recently showed that ephrin-A2A5(-/-) mice completed significantly fewer trials in a visual task than wildtype mice, and that concurrent low-intensity (LI-) rTMS during the task could partially rescue the abnormal behavior [Poh et al. 2018, eNeuro, vol. 5]. Here, we investigated whether the behavioral differences in ephrin-A2A5(-/-) mice are due to abnormal motivation, primarily a dopamine-modulated behavior, and whether LI-rTMS would increase motivation. Ephrin-A2A5(-/-) and wildtype mice underwent 14 daily sessions of progressive ratio (PR) tasks and received either sham or LI-rTMS during the first 10 min. Ephrin-A2A5(-/-) mice responded more than wildtype comparisons, and LI-rTMS did not influence task performance for either strain. Therefore concurrent stimulation does not influence motivation in a PR task. However, ephrin-A2A5(-/-) mice did have abnormal performance in the PR tasks after a change in the PR schedule which suggests perseverative behavior. We stained for c-Fos in the prelimbic area (PrL), ventral tegmental area and nucleus accumbens (NAc) core and shell to examine neuronal activity from the final PR session. Sham ephrin-A2A5(-/-) mice had lower c-Fos expression in the PrL and NAc vs. wildtype mice. Ephrin-A2A5(-/-) mice that received LI-rTMS showed c-Fos expression closer to wildtype levels in the NAc. Combined with high PR performance, ephrin-A2A5(-/-) mice show an abnormal shift to habitual responding and LI-rTMS may attenuate this shift. |
