Abstract
Background
Perineural invasion (PNI) is a prevalent phenomenon in salivary adenoid cystic carcinoma (SACC). Nevertheless, the regulatory mechanism of PNI is largely elusive.
Methods
We detected Apolipoprotein D (ApoD) expression and further determined its role in SACC progression. Subsequently, the contributions of SACC-derived ApoD on neurite outgrowth of dorsal root ganglions (DRGs) cells were explored. Moreover, a series of in vivo assays were conducted to elucidate the role of ApoD in the SACC PNI process.
Results
We observed a dramatic up-regulation of ApoD in the SACC associated with an enhancement of PNI in patient biopsies. We found that SACC-derived ApoD elevated cancer cell migration and invasion. In addition, ApoD could facilitate the neurite outgrowth of cultured DRG cells in a CXCR4-dependent manner in vitro, as well as innervation, angiogenesis, and invasion along peripheral nerves of SACC in vivo. More importantly, by advanced bioinformatic analysis, we unexpectedly revealed a novel phenomenon ‘tumour cell to neuron-like cell transition’ in the ApoD-rich microenvironment in vivo, contributing to the neurogenesis in the SACC tumour.
Conclusion
we discovered a novel role of cancer-derived ApoD in the pathogenesis of PNI, which may represent an effective therapeutic target for SACC in clinics.
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Data availability
The RNA-seq data have been submitted to the GEO database with the accession number is GSE281812.
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Acknowledgements
We sincerely acknowledge Xiaoting Chen and Xijing Yang from the Animal Experimental Center of West China Hospital for technical assistance in animal experiments. In addition, we acknowledge Juan Wu for the data processing and contribution on RNA-Seq submitting.
Funding
This study was funded by the National Natural Science Foundation of China (82270994), the Science and Technology Department of Sichuan Province (2023NSFSC0704, 2023NSFSC0573).
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Huang GZ: methodology, investigation, data curation, visualisation, writing—original draft and writing—review & editing; Chen S: investigation, data curation, formal analysis and visualisation; Han B: investigation, funding acquisition; Zhang GW: investigation; Bao MZ: data curation; Paka Lubamba G: formal analysis; Hua YF: data curation; Li HL: investigation; Liu WW: writing—review & editing; Shen JF: writing—review & editing; Wang L: writing—review & editing; Lin J: supervision, funding acquisition; Patrick Ming-Kuen Tang: supervision and writing—review & editing; Ding ZF: methodology, supervision and writing—review & editing; Li CJ: conceptualisation, methodology, project administration, supervision, funding acquisition and writing—review & editing.
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Written informed consent was obtained from all patients. This study was approved by the Ethical Committee of West China School of Stomatology, Sichuan University (WCHSIRB-D-2022-445). All animal experiments were approved by the Animal Ethical Committee of West China School of Stomatology, Sichuan University (WCHSIRB-D-2022-337). All methods were performed in accordance with the relevant guidelines and regulations.
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Huang, G., Chen, S., Han, B. et al. Apolipoprotein D is crucial for promoting perineural invasion in salivary adenoid cystic carcinoma. Br J Cancer 132, 599–610 (2025). https://doi.org/10.1038/s41416-025-02946-1
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DOI: https://doi.org/10.1038/s41416-025-02946-1