Abstract:
:The transforming growth factor-β (TGF-β)/Smads signal plays an important role in cancer metastasis by mediating the epithelial-mesenchymal transition (EMT) in cancer cells. lnc-TSI is a recently identified long noncoding RNA that negatively regulates the TGF-β/Smads signal. The present study was conducted to test the hypothesis that lnc-TSI inhibits metastasis in clear cell renal cell carcinoma (ccRCC) by regulating the TGF-β/Smad3 pathway. Herein, we show that lnc-TSI was upregulated in ccRCC cells and tissue and was associated with activation of the TGF-β/Smads signal. Depleting lnc-TSI enhanced tumor cell invasion and metastasis in vitro and ccRCC lung metastasis in vivo, whereas overexpressing lnc-TSI inhibited ccRCC cell invasion and tumor metastasis. Mechanistic studies indicated that lnc-TSI specifically inhibited the phosphorylation of Smad3 and subsequent EMT by binding with the MH2 domain of Smad3 to block the interaction between Smad3 and TGF-β receptor I in ccRCC cells. In a cohort of 150 patients with ccRCC, expression of lnc-TSI in tumors was negatively correlated with phosphorylated (p)Smad3 and activated EMT markers. Patients with expression of tumor lnc-TSI greater than or equal to the median at radical nephrectomy had a higher survival rate compared to those with lnc-TSI below the median during follow-up. These findings reveal a new regulatory mechanism of ccRCC metastasis and suggest a potential molecular target for the development of anti-cancer drugs.
journal_name
Mol Ther Nucleic Acidsjournal_title
Molecular therapy. Nucleic acidsauthors
Wang P,Chen W,Ma T,Lin Z,Liu C,Liu Y,Hou FFdoi
10.1016/j.omtn.2020.08.003subject
Has Abstractpub_date
2020-08-05 00:00:00pages
1-16issn
2162-2531pii
S2162-2531(20)30232-8journal_volume
22pub_type
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