Hypoxia-induced miR-5100 promotes exosome-mediated activation of cancer-associated fibroblasts and metastasis of head...

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Head and neck squamous cell carcinoma (HNSCC) metastasis involves tumor cell and microenvironment interactions, including hypoxia and stromal cells.
• The precise mechanisms of hypoxia-driven tumor-stroma crosstalk in HNSCC metastasis require further elucidation.

Purpose of the Study:

• To investigate the role of hypoxia-inducible factor 1-alpha (HIF1α) in HNSCC metastasis.
• To identify molecular pathways mediating hypoxia-induced tumor-stroma crosstalk in HNSCC.
• To evaluate miR-5100 as a potential biomarker for HNSCC malignant progression.

Main Methods:

• Analysis of HIF1α and miR-5100 expression in HNSCC specimens.
• Investigating the transcriptional regulation of miR-5100 by HIF1α.
• Studying the effect of hypoxia-induced exosomal miR-5100 on cancer-associated fibroblast (CAF) activation.
• Assessing the QKI/AKT/STAT3 signaling pathway in CAF activation.
• Correlating plasma exosomal miR-5100 levels with HNSCC progression.

Main Results:

• HIF1α was upregulated in HNSCC and associated with lymph node metastasis and poor prognosis.
• HIF1α positively correlated with miR-5100 and α-SMA (CAF marker).
• Hypoxia/HIF1α transcriptionally upregulated miR-5100, leading to QKI (tumor suppressor) degradation.
• Exosomal miR-5100 from hypoxic HNSCC activated CAFs via the QKI/AKT/STAT3 axis, promoting metastasis.
• Plasma exosomal miR-5100 levels indicated HNSCC malignant progression.

Conclusions:

• A novel HIF1α/miR-5100/QKI pathway drives HNSCC metastasis through tumor-stroma crosstalk.
• Exosomal miR-5100 plays a critical role in activating CAFs and facilitating HNSCC invasion.
• miR-5100 shows potential as a diagnostic biomarker and therapeutic target for HNSCC.