Abstract
Background
Inflammatory cancer-associated fibroblasts (iCAFs) was first identified by co-culture of pancreatic stellate cells and tumor organoids. The key feature of iCAFs is IL-6high/αSMAlow. We examine this phenomenon in gastric cancer using two cell lines of gastric fibroblasts (HGF and YS-1).
Methods and results
HGF or YS-1 were co-cultured with MKN7 (a gastric adenocarcinoma cell line) in Matrigel. IL-6 protein levels in the culture supernatant were measured by ELISA. The increased production of IL-6 was not observed in any of the combinations. Instead, the supernatant of YS-1 exhibited the higher levels of IL-6. YS-1 showed IL-6high/αSMA (ACTA2)low in real-time PCR, mRNA-seq and immunohistochemistry. In mRNA-seq, iCAFs-associated genes and signaling pathways were up-regulated in YS-1. No transition to myofibroblastic phenotype was observed by monolayer culture, or the exposure to sonic hedgehog (SHH) or TGF-β. YS-1 conditioned medium induced changes of morphology and stem-ness/differentiation in NUGC-3 (a human gastric adenocarcinoma cell line) and UBE6T-15 (a human bone marrow-derived mesenchymal stem cell line).
Conclusions
YS-1 is a stable cell line of gastric iCAFs. This discovery will promote further research on iCAFs for many researchers.
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Data availability
All data generated or analyzed during this study are included in this article. The raw data of mRNA-seq will be shared on reasonable request to the corresponding author.
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Acknowledgements
YS-1 cells were donated by Dr. Yutaka Shimada (Department of Nanobio Drug Discovery Graduate School of Pharmaceutical Sciences, Kyoto University) via the JCRB Cell Bank (https://cellbank.nibiohn.go.jp/). DNA Chip Research Inc. acquired mRNA-seq read count data from frozen cultured cells. This research was funded by the Japan Society for the Promotion of Science (JSPS) KAKENHI, grant number 20K16203.
Funding
This research was funded by the Japan Society for the Promotion of Science (JSPS) KAKENHI, grant number 20K16203.
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S.N and H.U contributed to the study conception. S.N and M.K contributed investigation. S.N, M.K and H.U contributed validation. S.N contributed the project administration, funding acquision, methodology, data curation, formal analysis, visualization and writing original draft preparation. H.U reviewed and edited the draft and supervised the study.
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Numakura, S., Kato, M. & Uozaki, H. Discovery of YS-1 as a cell line of gastric inflammatory cancer-associated fibroblasts. Mol Biol Rep 51, 542 (2024). https://doi.org/10.1007/s11033-024-09442-4
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DOI: https://doi.org/10.1007/s11033-024-09442-4