Abstract
NPC is a type of cancer with a poor prognosis. We aim to excavate the regulatory roles of miR-135b-5p in NPC and uncover the underlying mechanism. The levels of miR-135b-5p and Sirtuin 1 (SIRT1) in NPC and normal tissues and cells were tested via quantitative real-time PCR, western blotting, and immunohistochemistry, respectively. The binding relationship between them was predicted with ENCORI databases and validated with dual-luciferase reporter assay. The impact of miR-135b-5p and SIRT1 on the expressions of matrix metalloproteinase 7 (MMP7) and epithelial–mesenchymal transformation (EMT) proteins in NPC cells was evaluated by western blotting. Metastasis of NPC cells was evaluated by Transwell assay. The binding of c-JUN at the MMP7 promoter and deacetylation of c-JUN were examined using chromatin-immunoprecipitation and co-immunoprecipitation, respectively. The level of miR-135b-5p was increased and SIRT1 was decreased in NPC tissues and cells. miR-135b-5p was validated to target SIRT1. Silencing of miR-135b-5p accelerated EMT and metastasis of NPC cells, whereas knockdown of SIRT1 showed opposite results. Notably, knockdown of SIRT1 partially reversed the miR-135b-5p-induced change of EMT markers and metastasis of NPC cells. Mechanistically, miR-135b-5p disrupted SIRT1-induced deacetylation of c-JUN to promote the activation of MMP7 in NPC cells. miR-135b-5p targeted SIRT1 to inhibit deacetylation of c-JUN and increase MMP7 expression to promote malignancy of NPC cells.
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Data Availability
The datasets used during the present study are available from the corresponding author upon reasonable request.
Abbreviations
- NPC:
-
Nasopharyngeal carcinoma
- qRT-PCR:
-
Quantitative real-time PCR
- miRs/miRNAs:
-
MicroRNAs
- DLR:
-
Dual-luciferase reporter
- IHC:
-
Immunohistochemistry
- EBV:
-
Epstein-Barr virus
- EMT:
-
Epithelial–mesenchymal transformation
- SIRT1:
-
Sirtuin 1
- Sir2:
-
Silent information regulator 2
- MMP7:
-
Matrix metalloproteinase 7
- RFS:
-
Relapse-free survival
- ECM:
-
Extracellular matrix
- ChIP:
-
Chromatin-immunoprecipitation
- Co-IP:
-
Co-immunoprecipitation
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Cheng, Y. miR-135b-5p Targets SIRT1 to Inhibit Deacetylation of c-JUN and Increase MMP7 Expression to Promote Migration and Invasion of Nasopharyngeal Carcinoma Cells. Mol Biotechnol 64, 693–701 (2022). https://doi.org/10.1007/s12033-022-00457-5
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DOI: https://doi.org/10.1007/s12033-022-00457-5