Red Blood Cell-Derived Exosomal miR-93-5p Promotes Lung Cancer Progression through PTEN Suppression.

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Red blood cells (RBCs) are traditionally known for gas exchange and metabolic regulation.
• Their role in cancer progression has been largely unrecognized.
• MicroRNAs (miRNAs) are increasingly implicated in cancer development and signaling.

Purpose of the Study:

• To identify an unrecognized role for RBCs in lung cancer progression.
• To investigate the mechanism of intercellular communication between RBCs and lung cancer cells.
• To explore the diagnostic and therapeutic potential of exosomal miR-93-5p in lung cancer.

Main Methods:

• Analysis of miR-93-5p levels in RBCs and plasma from lung cancer patients and healthy controls.
• Functional assays using cell cultures to study exosome-mediated miRNA transfer and its effect on tumor cells.
• In vivo studies using mouse models of lung cancer to evaluate the impact of RBC-derived exosomal miR-93-5p and therapeutic interventions.
• Inhibition of miR-93-5p and restoration of PTEN to assess their effects on cancer progression.

Main Results:

• Elevated miR-93-5p levels were found in RBCs and RBC-derived exosomes of lung cancer patients, correlating with advanced stage and poor prognosis.
• RBC-derived exosomal miR-93-5p suppresses PTEN in tumor cells, enhancing proliferation, migration, and invasion.
• A bidirectional communication axis was identified where lung cancer cells also transfer miR-93-5p to RBCs.
• Inhibition of miR-93-5p or PTEN restoration reversed cancer-promoting effects.
• RBC-derived exosomal miR-93-5p accelerated tumor growth and reduced survival in mouse models.
• Therapeutic targeting of miR-93-5p suppressed tumor burden, reduced metastasis, and prolonged survival in mice.

Conclusions:

• Red blood cells play an active role in promoting lung cancer progression through the exosomal transfer of oncogenic miR-93-5p.
• A novel bidirectional tumor-RBC-tumor communication axis contributes to lung cancer malignancy.
• Exosomal miR-93-5p in RBCs represents a potential diagnostic biomarker and therapeutic target for lung cancer.