Targeting SphK2 reverses acquired resistance of Regorafenib in hepatocellular carcinoma
Open accessAbstract
Background: Regorafenib is a second-line therapy drug used for advanced hepatocellular carcinoma (HCC). Unfortunately, the survival benefit of the patients receiving this treatment is modest, which may be attributed to drug resistance. In the present study, Sphingosine kinase 2 (SphK2) was targeted to reverse regorafenib-resistance in HCC. Methods: The function of SphK2 and sphingosine-1-phosphate (S1P), the catalytic product of SphK2 in regorafenib-resistance of HCC cells were evaluated by cell counting kit-8 assay, colony formation, cell cycle evaluation and Annexin V-FITC/PI double staining assay. The antitumor activity of combined treatment of regorafenib and the SphK2 specific inhibitor ABC294640 was examined in HCC cells in vitro and xenograft model in vivo. The molecular mechanisms of SphK2/S1P mediating regorafenib-resistance were investigated using cell line establishment and western blot analysis. Results: Well developed regorafenib-resistant HCC cells indicated high expression levels of SphK2. The sensitivity to regorafenib of regorafenib-resistant HCC cells was restored following SphK2 knockdown or pharmacological inhibition by ABC294640. In addition, ectopic expression of SphK2 and exogenous addition of S1P decreased the sensitivity of HCC cells to regorafenib. Furthermore, the combination treatment with ABC294640 sensitized resistant tumor to regorafenib in xenograft model of HCC. The phosphorylation levels of nuclear factor κB (NF-κB) as well as those of signal transducer and activator of transcription 3 (STAT3) were positively associated with SphK2 and S1P. Conclusions: SphK2/S1P mediates regorafenib resistance of HCC through NF-κB and STAT3 activation. Targeting SphK2 by ABC294640 potently reduces regorafenib resistance of HCC cells both in vitro and in vivo. The combination of ABC294640 and regorafenib could be developed as a novel potential treatment strategy for advanced HCC.
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SphK2 expression and nuclear translocation of p65 were increased in regorafenib-resistant hepatocellular carcinoma-derived cells.
“SphK2 expression and nuclear translocation of p65 were increased in these cells.”
From Nuclear SphK2/S1P signaling is a key regulator of ApoE production and Aβ uptake in astrocytes (2024) · cites this paper as [55]
The Results section on SphK2 expression reports that SphK2 was significantly upregulated in regorafenib-resistant HCC cells compared with parental cells. The Results section on NF-κB and STAT3 reports increased phosphorylation of p65, but does not report increased nuclear translocation of p65. Phosphorylation does not establish the claimed change in cellular location. (LLM, conf=0.88)
Experimental — accuracy not yet measuredIncreased SphK2 expression activates the NF-κB pathway.
“activation of the NF-κB pathway by increased SphK2 expression was similar to that observed in regorafenib-resistant hepatocellular carcinoma-derived cells (55)”
From Nuclear SphK2/S1P signaling is a key regulator of ApoE production and Aβ uptake in astrocytes (2024) · cites this paper as [55]
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Cancer drug resistance: an evolving paradigm
Holohan, C., Van Schaeybroeck, S., Longley, D. B., & Johnston, P. G. (2013) · Nature Reviews Cancer · doi:10.1038/nrc3599 · Cited by 4,681 · see citing works
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Cited by
Sorted by citations
Nuclear SphK2/S1P signaling is a key regulator of ApoE production and Aβ uptake in astrocytes
Komai, M., Noda, Y., Ikeda, A., Kaneshiro, N., Kamikubo, Y., Sakurai, T., Uehara, T., & Takasugi, N. (2024) · Journal of Lipid Research · doi:10.1016/j.jlr.2024.100510 · Cited by 13 · see citing works
- Authors
- Shi, W., Zhang, S., Ma, D., Yan, D., Zhang, G., Cao, Y., Wang, Z., Wu, J., & Jiang, C.
- Affiliations
- Nanjing Drum Tower Hospital (CN)
- Nanjing University (CN)
- Corresponding author
- Wang, Zhongxia
- Wu, Junhua
- Jiang, Chunping
- ORCID
- Venue
- Frontiers in Oncology
- Publisher
- Frontiers Media SA
- Published
- 2020-06-24
- Volume
- 10
- Pages
- 694-694
- ISSN
- 2234-943X (ISSN-L)
- PMC
- PMC7327090
- OpenAlex
- W3037255929
- Cited by
- 61
- References
- 1
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 13 · 2023: 20 · 2022: 11 · 2021: 3 · 2020: 1
- FWCI
- 2.80
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Oncology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (81572393, 81602093, 81972888)
- Natural Science Foundation of Jiangsu Province (BK20141324, BK20160118)
- Medical Science and Technology Development Foundation, Nanjing Municipality Health Bureau (ZKX15020, ZKX17022)
- Fundamental Research Funds for the Central Universities (021414380215, 021414380242, 021414380258, 14380329/3)
- Jiangsu Provincial Key Research and Development Program (BE2018701)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sphingolipid Metabolism and Signaling
- Health Sciences › Medicine › Hepatology › Hepatocellular Carcinoma Treatment and Prognosis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
- Keywords
- sphingosine kinase 2, sphingosine-1-phosphate, regorafenib resistance, hepatocellular carcinoma, ABC294640, NF-κB, STAT3, combination therapy, drug resistance reversal
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