Abstract
Olfactory dysfunction is increasingly recognized as an early indicator of Alzheimer’s disease (AD). Aberrations in GABAergic function and the excitatory/inhibitory (E/I) balance within the olfactory bulb (OB) have been implicated in olfactory impairment during the initial stages of AD. While the neuregulin 1 (NRG1)/ErbB4 signaling pathway is known to regulate GABAergic transmission in the brain and is associated with various neuropsychiatric disorders, its specific role in early AD-related olfactory impairment remains incompletely understood. This study demonstrated that olfactory dysfunction preceded cognitive decline in young adult APP/PS1 mice and was characterized by reduced levels of NRG1 and ErbB4 in the OB. Further investigation revealed that deletion of ErbB4 in parvalbumin interneurons reduced GABAergic transmission and increased hyperexcitability in mitral and tufted cells (M/Ts) in the OB, thereby accelerating olfactory dysfunction in young adult APP/PS1 mice. Additionally, ErbB4 deficiency was associated with increased accumulation of Aβ and BACE1-mediated cleavage of APP, along with enhanced CDK5 signaling in the OB. NRG1 infusion into the OB was found to enhance GABAergic transmission in M/Ts and alleviate olfactory dysfunction in young adult APP/PS1 mice. These findings underscore the critical role of NRG1/ErbB4 signaling in regulating GABAergic transmission and E/I balance within the OB, contributing to olfactory impairment in young adult APP/PS1 mice, and provide novel insights for early intervention strategies in AD.

This work has shown that ErbB4 deficiency increased the burden of Aβ, impaired GABAergic transmission, and disrupted the E/I balance of mitral and tufted cells (M/Ts) in the OB, ultimately resulting in olfactory dysfunction in young adult APP/PS1 mice. NRG1 could enhance GABAergic transmission, rescue E/I imbalance in M/Ts, and alleviate olfactory dysfunction in young adult APP/PS1 mice. OB: olfactory bulb, E/I: excitation/inhibition, Pr: probability of release, PV: parvalbumin interneurons, Aβ: β-amyloid, GABA: gamma-aminobutyric acid.
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Change history
26 July 2024
In the originally published article the ESM file has been omitted. This has been corrected.
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Acknowledgements
Thanks to Prof. Lin Mei (Chinese Institutes for Medical Research) and Prof. Xiao-ming Li (Zhejiang University) for the generous gift of loxp-flanked ErbB4 mice and PV-Cre mice. Thanks to Prof. Jie Zhang (Xiamen University) for kindly providing antibodies of CDK5 and p35.
Funding
The work was supported by the National Natural Science Foundation of China (82274301 and 81774377), the Natural Science Foundation of Fujian Province of China (2021J01019), the National Key Research and Development Program of China (2016YFC1305903) and the Program for New Century Excellent Talents in University of China (NCET-13-0505).
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LW designed the experiments, supervised the project. XHD and XYL wrote the manuscript, LW, GQZ and SFL edited the manuscript. XHD, YHW and KW performed the Western blotting experiments and analyzed the data. XHD, XYL, YHW and RG performed the electrophysiological experiments. JJZ and JYZ analyzed the electrophysiological data. JRZ, MDW, and QHY performed the immunostaining., YHW, YFZ, JYZ and JJZ helped with animal breeding, behavioral experiments as well as data analysis. YJC, JQH, ZXC, SQH and CSL have directly accessed and verified the underlying data reported in the manuscript. All authors read and approved the final manuscript.
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Deng, Xh., Liu, Xy., Wei, Yh. et al. ErbB4 deficiency exacerbates olfactory dysfunction in an early-stage Alzheimer’s disease mouse model. Acta Pharmacol Sin 45, 2497–2512 (2024). https://doi.org/10.1038/s41401-024-01332-6
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DOI: https://doi.org/10.1038/s41401-024-01332-6