Abstract
The present study was designated to investigate the effect of oxytocin (OXT) on the retrieval of methamphetamine (METH)-associated reward memories induced by drugs in mice and its underlying mechanisms related to adult hippocampal neurogenesis (AHN) and memory engrams. The data showed that repeated hippocampal microinjections of OXT (1.25 and 2.5 μg) for 8 consecutive days significantly prevented the retrieval of METH-associated reward memories induced by drugs in a time-, dose- and receptor-dependent manner in mice. At the meanwhile, OXT was found to markedly elevate AHN levels, enhancing the proliferation, survival and maturation of newborn neurons by using NestinCreERT2::Rosa26-tdTomato mice and BrdU labeling. Notably, reduction or depletion of AHN by temozolomide (TMZ) or NestinCreERT2 mice combined with adeno-associated viruses (AAVs) (AAV-CAG-DIO-rtTA-EGFP and AAV-TRE-DTA) could attenuate the inhibition of OXT on the retrieval of METH-associated reward memories in mice. By using activity-dependent labeling strategy in mice, it was observed that the retrieval of METH-associated reward memories was mediated by activation of METH-associated memory engrams in the dentate gyrus (DG) region of the hippocampus. Repeated hippocampal microinjections of OXT effectively prevented the activation of these memory engrams, which could be abolished after reducing AHN by TMZ. In summary, this study revealed that OXT effectively prevented the retrieval of METH-associated reward memories induced by drugs in mice, which may be related to its enhancement on AHN as well as inhibition on METH-associated memory engrams in DG.

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All data needed for the conclusion in the present study were presented in the manuscript and Supplementary Materials. Additional data to this paper may be requested from the corresponding authors.
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Acknowledgements
The present research was supported by the National Natural Science Foundation of China (82273916) from Jingyu Yang, the National Natural Science Foundation of China Youth Fund Project (82204373), the Youth Scientific Research Project of Educational Commission of Liaoning Province (JYTQN2023320), the General Project of Liaoning Provincial Department of Science and Technology (2024-MSLH-427) and the Youqing Support Project of Shenyang Pharmaceutical University (YQ202201) from Xiaohang Che. The graphic abstract was created with the help of Adobe Illustrator CS6 software.
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CJL and CXH contributed equally to this work. CJL, CXH, LYT, YJY and WCF contributed to the conception and design of the present study. CJL, CXH, DYL, GZK, YMX, LXC, ZWZ, ANN and BYJ performed the experiment. LXL, LYC and XTY performed the statistical analysis of the experimental data. CJL and CXH wrote the first draft of the manuscript. DYL and YMX wrote the sections of the manuscript. All authors contributed to manuscript revision, read and approved the submitted version.
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Cai, J., Che, X., Deng, Y. et al. Oxytocin attenuates the retrieval of methamphetamine-associated reward memories by enhancing adult hippocampal neurogenesis in mice. Mol Psychiatry 30, 5664–5679 (2025). https://doi.org/10.1038/s41380-025-03222-7
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DOI: https://doi.org/10.1038/s41380-025-03222-7


