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. 2020 Jul 14;14:646. doi: 10.3389/fnins.2020.00646

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Copyright © 2020 Ma, Fu, Cao, Shao, Song, Sheng, Yang, Cui, Chen, Zhao, Luo, Lai and Zheng.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The influence of the inactivation of the CA1 of dorsal hippocampus on the increased expression of the c-Fos in the POR and the influence of chemical-genetic inactivation of the projection neurons from the CA1 of dorsal hippocampus to the POR on CPA score in morphine withdrawn mice. (A) The influence of the inactivation of the CA1 of dorsal hippocampus on the increased expression of the c-Fos in the POR. Top panel: the experimental timeline and groups for the CPA procedure. Left middle panel: the typical injection site of muscimol in the CA1 of dorsal hippocampus. Scale bar = 500 μm. Right middle panel: the CPA score of each group (n = 7 in each group, *p = 0.0004, compared with pre-test, two-way ANOVA, Bonferroni post hoc analysis). Left down panel: C-Fos positive neurons in the POR in each group. Scale bar = 100 μm. Higher magnification images of boxed regions are shown on the top. Scale bar = 20 μm. Right down panel: the average numbers of c-Fos positive neurons in the POR in each group (n = 4 in saline + saline + muscimol group and morphine + naloxone + saline group, n = 5 in morphine + naloxone + muscimol group, *p = 0.0007, one-way ANOVA following by Tukey post hoc analysis). (B) The influence of chemical-genetic inactivation of the projection neurons from the CA1 of dorsal hippocampus to the POR on CPA score in morphine withdrawn mice. Top panel: the CNO inhibit experimental timeline and groups for the CPA procedure. Left middle panel: expression of hM4Di (Gi) (green-colored) in the CA1 of dorsal hippocampus 4 weeks after the virus injection. Scale bar = 100 μm. Left down panel: expression of WGA-Cre (red-colored) in the POR 4 weeks after the virus injection. Scale bar = 100 μm. Right down panel: the CPA scores of saline group and CNO group (n = 10 in CNO group, n = 3 in saline group, *p = 0.0083, compared with pre-test, two-way ANOVA, Bonferroni post hoc analysis). Data are shown as the mean ± SEM.