Abstract
Directed migration of neural stem cells (NSCs) is critical for embryonic neurogenesis and the healing of neurological injuries. The long noncoding RNA (lncRNA) Pnky has been reported to regulate neuronal differentiation of NSCs by interacting with PTBP1. However, its regulatory effect on NSC migration remains to be determined. Herein, we identified that Pnky is also a key regulator of NSC migration in mice, as underscored by the finding that Pnky silencing suppressed but Pnky overexpression promoted the in vitro migration of both C17.2 and NE4C murine NSCs. Additionally, in vivo cell tracking demonstrated that Pnky depletion attenuated but Pnky overexpression facilitated the migration of NE4C cells in the spinal canal after transplantation via injection into the spinal canal. Mechanistically, Pnky regulated the expression of a core set of critical regulators that direct NSC migration, including MMP2, MMP9, Connexin43, Paxillin, AKT, ERK, and P38MAPK. Using catRAPID, a web server for large-scale prediction of protein–RNA interactions, the splicing factors U2AF1 and U2AF1L4, as well as the mRNA export adaptors SARNP, Aly/Ref, and THOC7, were predicted to interact strongly with Pnky. Further investigations using colocalization and RNA immunoprecipitation (RIP) assays confirmed the direct binding of Pnky to U2AF1, SARNP, Aly/Ref, and THOC7. Transcriptomic profiling revealed that as many as 5319 differential splicing events of 3848 genes, which were highly enriched in focal adhesion, PI3K-Akt and MAPK signaling pathways, were affected by Pnky depletion. The predominant subtype of differential splicing by Pnky depletion is intron retention, followed by alternative 5' and 3' splice sites and mutually exclusive exons. Moreover, Pnky knockdown substantially blocked but Pnky overexpression facilitated the export of MMP2, Paxillin, AKT, p38MAPK, and other mRNAs to the cytosol. Collectively, our data showed that through interacting with U2AF1, SARNP, Aly/Ref, and THOC7, Pnky couples and modulates the splicing and export of target mRNAs, which consequently controlling NSC migration. These findings provide a possible theoretical basis of NSC migration regulation.
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The datasets generated during and/or analyzed during the current study are available online. https://www.jianguoyun.com/p/DaJknWUQytvbCRiEpIQE.
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This work was supported by the National Natural Science Foundation of China (No. 31501099), the Middle-aged and Young of the Education Department of Hubei Province, China (No. Q20191104), and the Innovation and Entrepreneurship training Project for college students in Hubei Province, China (No. S202110488057).
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JND and YL designed the study, performed the research, and analyzed the data. YTS, WQZ, and JLZ helped finish some part of the study. CZ and JW helped in material preparation and data analysis. WSD participated in study design and modified the manuscript. SSZ contributed to study design, data collection and analysis, funding acquisition, and preparation of the manuscript. All authors read and approved the final manuscript.
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Du, J., Li, Y., Su, Y. et al. LncRNA Pnky Positively Regulates Neural Stem Cell Migration by Modulating mRNA Splicing and Export of Target Genes. Cell Mol Neurobiol 43, 1199–1218 (2023). https://doi.org/10.1007/s10571-022-01241-4
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DOI: https://doi.org/10.1007/s10571-022-01241-4