Related Experiment Video
Updated: Jan 29, 2026
Multi-photon Imaging of Tumor Cell Invasion in an Orthotopic Mouse Model of Oral Squamous Cell Carcinoma
Published on: July 25, 2011
MicroRNA‑199a‑5p functions as a tumor suppressor in oral squamous cell carcinoma via targeting the IKKβ/NF‑κB
Dongyi Wei1, Baohong Shen1, Weixin Wang1
1Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China.
Abstract:
MicroRNAs (miRNAs) have been shown to have a significant role in the progression of several types of cancer, including oral squamous cell carcinoma (OSCC). However, the biological function and regulatory mechanisms of miRNAs in OSCC remain to be fully elucidated. The aim of the present study was to investigate the role of miRNAs in OSCC and the relevant mechanism. Using a microarray, it was found that miRNA (miR)‑199a‑5p was one of the most downregulated miRNAs in OSCC tissues. A low expression of miR‑199a‑5p was closely associated with tumor differentiation, lymph node metastasis, tumor‑node‑metastasis stage, and overall survival rate. Functionally, the overexpression of miR‑199a‑5p suppressed cell proliferation, induced G0/G1 cell cycle arrest, and promoted the apoptosis of Tca8113 and SCC‑4 cells. Subsequently, inhibitor of nuclear factor‑κB (NF‑κB) kinase β (IKKβ), an important regulator of NF‑κB activation, was identified as a direct target of miR‑199‑5p. An inverse correlation was found between miR‑199a‑5p and IKKβ in tumor tissues. Further investigations revealed that the overexpression of IKKβ efficiently abrogated the influences caused by the overexpression of miR‑199a‑5p. It was also found that the miR‑199a‑5p‑mediated anticancer effects were dependent on the inhibition of NF‑κB activation. These findings indicate that miR‑199a‑5p functions as a tumor suppressor through regulation of the NF‑κB pathway by targeting IKKβ in OSCC.
Insights
MicroRNA-199a-5p acts as a tumor suppressor in oral squamous cell carcinoma (OSCC). Its downregulation correlates with poor prognosis, and it inhibits cancer progression by targeting IKKβ and suppressing the NF-κB pathway.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) play a critical role in cancer development, including oral squamous cell carcinoma (OSCC).
- The specific functions and regulatory pathways of miRNAs in OSCC are not fully understood.
- Identifying key miRNAs and their targets is crucial for understanding OSCC pathogenesis.
Purpose of the Study:
- To investigate the role and mechanism of microRNAs in oral squamous cell carcinoma (OSCC).
- To identify specific miRNAs dysregulated in OSCC and elucidate their functional impact.
- To explore the molecular targets and signaling pathways regulated by key miRNAs in OSCC.
Main Methods:
- Microarray analysis to identify differentially expressed miRNAs in OSCC tissues.
- Cell proliferation, cell cycle, and apoptosis assays to assess functional effects of miRNA overexpression.
- Western blotting and correlation analysis to validate miRNA-target interactions and pathway modulation.
Main Results:
- MicroRNA (miR)-199a-5p was significantly downregulated in OSCC tissues, correlating with poor differentiation, metastasis, and survival.
- Overexpression of miR-199a-5p suppressed proliferation, induced cell cycle arrest, and promoted apoptosis in OSCC cells.
- IKKβ was identified as a direct target of miR-199a-5p, and its inhibition was crucial for miR-199a-5p's tumor-suppressive effects via the NF-κB pathway.
Conclusions:
- miR-199a-5p functions as a tumor suppressor in OSCC.
- The miR-199a-5p/IKKβ/NF-κB axis represents a novel regulatory mechanism in oral cancer.
- Targeting miR-199a-5p or the NF-κB pathway may offer therapeutic strategies for OSCC.
Related Concept Videos
02:26NF-κB-dependent Signaling Pathway
NF-κB-dependent Signaling Mechanism
The...
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
03:14Notch Signaling Pathway
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
02:33Hedgehog Signaling Pathway
01:19Interactions Between Signaling Pathways
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
01:22MicroRNAs