Abstract
Background
Hirschsprung disease (HSCR) is a congenital intestinal disease characterised by functional obstruction of the colon. Herein, we investigated the role and mechanism of the gene GFRA4 in HSCR.
Methods
GFRA4 expression in the ganglionic and aganglionic segment tissues in patients with HSCR and healthy colon tissues were detected using qRT-PCR, western blot, and immunohistochemistry. Cell proliferation, cycle distribution, apoptosis, changes in mitochondrial membrane potential, and differentiation were assessed in mouse enteric neural crest stem cells (ENCSCs) using the CCK-8 assay, EdU staining, flow cytometry, JC-1 probe, and immunofluorescence, respectively. GSEA analysis was performed to screen the signaling pathways regulated by GFRA4.
Results
GFRA4 was downregulated in aganglionic segment tissues compared to control and ganglionic segment tissues. GFRA4 overexpression promoted proliferation and differentiation, and inhibited apoptosis in ENCSCs, while GFRA4 down-regulation had the opposite result. GFRA4 activated the hedgehog pathway. GFRA4 overexpression enhanced the expression of key factors of the hedgehog pathway, including SMO, SHH, and GLI1. However, GFRA4 down-regulation reduced their expression. An antagonist of hedgehog pathway, cyclopamine, attenuated the effect of GFRA4 overexpression on proliferation, differentiation, and apoptosis of ENCSCs.
Conclusion
GFRA4 promotes proliferation and differentiation but inhibits apoptosis of ENCSCs via the hedgehog pathway in HSCR.
Impact
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This study confirms that GFRA4 improves the proliferation and differentiation of ENCSCs via modulation of the hedgehog pathway.
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This study for the first time revealed the role and the mechanism of the action of GFRA4 in HSCR, which indicates that GFRA4 may play a role in the pathological development of HSCR.
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Our findings may lay the foundation for further investigation of the mechanisms underlying HSCR development and into targets of HSCR treatment.
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Data availability
The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
Project ZR2020MH048 supported by Shandong Provincial Natural Science Foundation and the Natural Science Foundation of Tibet Autonomous Region (No.XZ202101ZR0004G)
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Conception and design: F.F.Z.; Perform research: F.F.Z., L.J.Z., and M.Y.C.; Data analysis and interpretation: B.Z.M., F.G., and G.W.; Manuscript writing: All authors; Final approval of manuscript: All authors.
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Zhang, F., Cui, M., Zhang, L. et al. GFRA4 improves the neurogenic potential of enteric neural crest stem cells via hedgehog pathway. Pediatr Res (2024). https://doi.org/10.1038/s41390-024-03158-8
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DOI: https://doi.org/10.1038/s41390-024-03158-8