miR-125a regulates angiogenesis of gastric cancer by targeting vascular endothelial growth factor A

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• MicroRNAs (miRNAs) play a critical role in gastric cancer (GC) development and progression.
• While miR-125a's tumor-inhibitory effects via targeting Her-2 in GC are known, its other functions remain under investigation.

Purpose of the Study:

• To investigate the role of miR-125a in regulating angiogenesis in gastric cancer.
• To explore the relationship between miR-125a expression and vascular endothelial growth factor A (VEGF-A) in GC.

Main Methods:

• In vitro studies using gastric cancer cells and human umbilical vein endothelial cells (HUVECs) to assess miR-125a's effect on VEGF-A secretion and endothelial cell function.
• Analysis of miR-125a and VEGF-A expression levels in gastric cancer tissues compared to normal tissues.
• In vivo assessment of the correlation between miR-125a expression and microvessel density (MVD) in tumors.

Main Results:

• miR-125a modulates VEGF-A expression in gastric cancer cells.
• Low miR-125a expression leads to increased VEGF-A secretion, promoting HUVEC proliferation, migration, and angiogenesis.
• miR-125a expression is significantly decreased in gastric cancer tissues and negatively correlated with VEGF-A expression.
• In vivo, miR-125a expression is inversely proportional to microvessel density (MVD).

Conclusions:

• miR-125a regulates the paracrine secretion of VEGF-A in gastric cancer.
• This regulation impacts tumor angiogenesis, with low miR-125a expression predicting worse survival in gastric cancer patients.