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- W2897521722 abstract "Thymosin α1 (Tα1) is one of the most commonly used immunomodulators for metastatic non-small-cell lung cancer (NSCLC) patients in many countries. Despite the identification of the direct suppression on cancer cell proliferation, little is known about its effect on metastasis and metastasis-related signaling such as matrix metalloproteinases (MMPs) and programmed cell death ligand 1 (PD-L1).NSCLC cells with distinguishing PD-L1 expression levels were treated with Tα1. siRNAs were used to knockdown PD-L1. Cell migration and invasion abilities were evaluated by wound-healing and transwell assays. The xenograft model by BALB/c nude mice was constructed to test the inhibitory effect of Tα1 on metastasis in vivo. The expression levels of metastasis-related signaling pathways and key molecules were assessed by Western blot (WB) and quantitative reverse transcriptase PCR (qRT-PCR).Tα1 significantly suppressed cell migration and invasion in PD-L1 high-expressing H1299, NL9980, and L9981 cells but not in PD-L1 low-expressing A549 or SPC-A-1 cells. This difference was demonstrated by mouse model in vivo as well. Knocking down of PD-L1 significantly impaired the inhibition of cell migration and invasion caused by Tα1 treating in PD-L1 high-expressing cells. Besides, Tα1 inhibited the activation and translocation of STAT3 and the expression of MMP2 in PD-L1 high-expressing NSCLC cells. Moreover, the treatment of STAT3 activator colivelin could partly reverse the Tα1-induced MMP2 suppression and the migration phenotype.Tα1 significantly suppresses migration and invasion in PD-L1 high-expressing NSCLC cells compared with PD-L1 low-expressing NSCLC cells in vitro and in vivo, through the downregulation of STAT3-MMP2 signaling. These different responses to Tα1, together with the depiction of Tα1-induced signaling changes, suggest a potential benefit of Tα1 for PD-L1-positive NSCLC patients, enlightening the combination of Tα1 with target therapy or immune checkpoint inhibitors." @default.
- W2897521722 created "2018-10-26" @default.
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- W2897521722 date "2018-10-01" @default.
- W2897521722 modified "2023-10-15" @default.
- W2897521722 title "Thymosin α1 suppresses migration and invasion of PD-L1 high-expressing non-small-cell lung cancer cells via inhibition of STAT3–MMP2 signaling" @default.
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- W2897521722 doi "https://doi.org/10.2147/ott.s177943" @default.
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