Abstract
This study aimed to investigate the role of cancer-associated fibroblast (CAF)-derived midkine (MK) in cisplatin (DDP) resistance. The primary cultures of CAFs and non-cancer fibroblasts (NFs) were isolated and purified. The DDP-resistant gastric cancer (GC) cells were cultured with CAF-conditioned medium. QRT-PCR and Elisa assays were employed to determine MK expression. The expression of ST7-AS1 was measured by qRT-PCR. The impact of CAFs, MK, and ST7-AS1 silencing on DDP resistance was determined by MTT and Annexin V/PI staining assay. Expression of EMT markers and PI3K/AKT was determined by Western blot and qRT-PCR. The role of MK in DDP resistance was confirmed in a xenograft model. Incubation with CAF-conditioned medium increased the IC50 to DDP. Also, incubation with CAF-conditioned medium increased cell viability, reduced cell apoptosis, and promoted EMT in DDP-resistant GC cells, which were all blocked with MK neutralization antibody treatment. MK increased the DDP resistance and upregulated the expression of ST7-AS1 in DDP-resistant GC cells. Additionally, ST7-AS1 knockdown increased the sensitivity to DDP by inhibiting EMT. Moreover, ST7-AS1 knockdown significantly decreased the phosphorylation of PI3K and AKT, and suppressed EMT, which were restored by MK addition. Finally, MK promoted tumor growth and DDP resistance in a mice model bearing the SGC-7901/DDP xenografts. CAF-derived MK promotes EMT-mediated DDP resistance via upregulation of ST7-AS1 and activation of PI3K/AKT pathway.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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This work was supported by General Projects of Hunan Natural Science Foundation (2019JJ40493).
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Guarantor: Z-JZ; concepts: Z-JZ, D-YF; design: D-YF; literature research: K-DY; clinical studies: YW; experimental studies: Q-LL; data acquisition: FZ; analysis: B-HL; manuscript preparation: YW; manuscript editing: Z-JZ; and manuscript review: Z-JZ.
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Yang, KD., Wang, Y., Zhang, F. et al. CAF-derived midkine promotes EMT and cisplatin resistance by upregulating lncRNA ST7-AS1 in gastric cancer. Mol Cell Biochem 477, 2493–2505 (2022). https://doi.org/10.1007/s11010-022-04436-x
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DOI: https://doi.org/10.1007/s11010-022-04436-x