Suppressing the PI3K/AKT Pathway by miR-30d-5p Mimic Sensitizes Ovarian Cancer Cells to Cell Death Induced by...

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• MicroRNAs are key regulators of gene expression implicated in tumor development.
• Estrogen receptor alpha (ERα) signaling is crucial in ovarian cancer pathophysiology.
• The role of miR-30 family members in ovarian cancer remains incompletely understood.

Purpose of the Study:

• To investigate the role of miR-30 family members in ovarian cancer.
• To elucidate the relationship between miR-30s, estrogen receptor alpha (ERα), and cell proliferation/death.
• To evaluate the therapeutic potential of miR-30d-5p in ovarian cancer.

Main Methods:

• Comparative analysis of miR-30 expression in ERα-positive (PEO1) and ERα-negative (A2780) ovarian cancer cell lines.
• Hormonal stimulation and ERα function blocking experiments.
• Assessment of cell proliferation, apoptosis, and autophagy.
• MiR-30d-5p mimic transfection and PI3K/AKT pathway inhibition (AZD8835).
• Sensitivity testing to tamoxifen.

Main Results:

• miR-30a-5p, miR-30d-5p, and miR-30e-5p were upregulated in ERα-positive PEO1 cells.
• Estrogen treatment induced these miRs, leading to apoptosis and autophagy in PEO1 cells.
• ERα blockade reduced estrogen tolerance, highlighting ERα's role in proliferation.
• miR-30d-5p mimic reduced proliferation and estrogen tolerance, decreasing SOX4 expression.
• PI3K/AKT pathway inhibition mimicked miR-30d-5p effects and sensitized cells to tamoxifen.

Conclusions:

• miR-30d-5p is overexpressed in ERα-positive ovarian cancer and influences cell proliferation and estrogen response.
• The miR-30d-5p/SOX4/PI3K/AKT axis is involved in ovarian cancer pathophysiology.
• miR-30d-5p and PI3K/AKT pathway inhibition show potential as therapeutic strategies, sensitizing cells to tamoxifen.