Abstract
Embryonic neurogenesis is tightly regulated by multiple factors to ensure the precise development of the cortex. Deficiency in neurogenesis may result in behavioral abnormalities. Pd1 is a well-known inhibitory immune molecule, but its function in brain development remains unknown. Here, we find brain specific deletion of Pd1 results in abnormal cortical neurogenesis, including enhanced proliferation of neural progenitors and reduced neuronal differentiation. In addition, neurons in Pd1 knockout mice exhibit abnormal morphology, both the total length and the number of primary dendrites were reduced. Moreover, Pd1cKO mice exhibit depressive-like behaviors, including immobility, despair, and anhedonia. Mechanistically, Pd1 regulates embryonic neurogenesis by targeting Pax3 through the β-catenin signaling pathway. The constitutive expression of Pax3 partly rescues the deficiency of neurogenesis in the Pd1 deleted embryonic brain. Besides, the administration of β-catenin inhibitor, XAV939, not only rescues abnormal brain development but also ameliorates depressive-like behaviors in Pd1cKO mice. Simultaneously, Pd1 plays a similar role in human neural progenitor cells (hNPCs) proliferation and differentiation. Taken together, our findings reveal the critical role and regulatory mechanism of Pd1 in embryonic neurogenesis and behavioral modulation, which could contribute to understanding immune molecules in brain development.
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Data availability
RNA-seq data are available in GEO with the following accession number: GSE207712.
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Acknowledgements
We thank all members of our lab for their valuable suggestions. We also thank Shiwen Li, Lijuan Wang, Hua Qin, and Xili Zhu for their help in confocal imaging and behavioral analysis. This work was supported by grants from the National Key R&D Program of China (2019YFA0110301 and 2021YFA1101402), the National Natural Science Foundation of China (32230040, 81825006, and 92149304), and Guangdong Basic and Applied Basic Research Foundation (2022B1515120026).
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FJ performed the experiments, analyzed the results, and wrote the manuscript. CF constructed the plasmids of Pd1 and Pdl1. JQ, CW, LS, WW, MZ, HL, LM, WL, CL, ZT, and BH provided help in the experiment performance. DZ provided help in human NSCs culture. FJ and JX supervised the project. JJ supervised the project and provided funding support.
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Ji, F., Feng, C., Qin, J. et al. Brain-specific Pd1 deficiency leads to cortical neurogenesis defects and depressive-like behaviors in mice. Cell Death Differ 30, 2053–2065 (2023). https://doi.org/10.1038/s41418-023-01203-3
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DOI: https://doi.org/10.1038/s41418-023-01203-3