Lin28B/Let-7 Regulates Expression of Oct4 and Sox2 and Reprograms Oral Squamous Cell Carcinoma Cells to a Stem-like...

Area of Science:

• Stem Cell Biology
• Cancer Research
• Molecular Biology

Background:

• Lin28 is crucial for cellular reprogramming and induced pluripotent stem cell (iPSC) generation, and its suppression of Let-7 microRNA contributes to tumorigenicity.
• The role of Lin28 in regulating cancer stem-like cells (CSC), particularly in oral squamous cell carcinoma (OSCC), remains unclear.

Purpose of the Study:

• To investigate the role of Lin28B in regulating cancer stem-like cell properties in OSCC.
• To elucidate the molecular mechanisms by which Lin28B influences CSC characteristics and their relationship with reprogramming factors.

Main Methods:

• Correlation analysis between Lin28B, Oct4, Sox2, and CSC markers (CD44, ALDH1) in OSCC.
• Ectopic expression studies of Lin28B and Let7 in OSCC cells.
• Identification of downstream effectors using molecular assays.
• Chromatin immunoprecipitation to confirm promoter binding.
• Analysis of Lin28B/Let7 pathway in iPSC reprogramming and clinical OSCC specimens.

Main Results:

• High Lin28B, Oct4, and Sox2 levels correlate with increased CD44(+)ALDH1(+) CSC populations in OSCC.
• Ectopic Lin28B expression enhances CSC properties and Oct4/Sox2 levels, which are reversed by Let7 co-overexpression.
• ARID3B and HMGA2 are identified as downstream targets of Lin28B/Let7 signaling, regulating Oct4 and Sox2 transcription.
• The Lin28B-Let7 pathway modulates stemness in OSCC and affects iPSC reprogramming efficiency.
• A Lin28B(high)-Let7(low) expression pattern in OSCC correlates with elevated ARID3B, HMGA2, OCT4, and SOX2.

Conclusions:

• Lin28B/Let7 signaling plays a critical role in regulating cancer stem-like cell properties in oral squamous cell carcinoma.
• The pathway involves ARID3B and HMGA2 as key mediators, impacting Oct4 and Sox2 expression.
• This mechanism highlights a potential therapeutic target for oral cancer by modulating stemness.