miR-9 regulates ferroptosis by targeting glutamic-oxaloacetic transaminase GOT1 in melanoma

Area of Science:

• Molecular Biology
• Cell Biology
• Oncology

Background:

• Ferroptosis is a regulated cell death form driven by lipid reactive oxygen species (ROS).
• The precise molecular mechanisms governing ferroptosis remain largely undefined.
• Understanding ferroptosis regulation is crucial for developing targeted cancer therapies.

Purpose of the Study:

• To identify novel regulators of ferroptosis in melanoma cells.
• To elucidate the role of microRNAs in ferroptosis pathways.
• To investigate the specific mechanism by which miR-9 influences ferroptosis.

Main Methods:

• Identification of a novel microRNA, miR-9, as a regulator of ferroptosis.
• Direct targeting of GOT1 (glutamic-oxaloacetic transaminase 1) by miR-9 was confirmed via 3'-UTR binding.
• Melanoma cell sensitivity to ferroptosis inducers (erastin, RSL3) was assessed under varying miR-9 and GOT1 levels.
• The impact of glutaminolysis inhibition on miR-9 mediated ferroptosis was evaluated.

Main Results:

• Overexpression of miR-9 led to GOT1 suppression, reducing erastin- and RSL3-induced ferroptosis.
• Inhibition of miR-9 increased melanoma cell sensitivity to ferroptosis.
• Blocking glutaminolysis abrogated the ferroptosis induced by anti-miR-9 treatment.
• miR-9 directly targets GOT1, modulating lipid ROS accumulation and ferroptotic cell death.

Conclusions:

• miR-9 acts as a key regulator of ferroptosis in melanoma by targeting GOT1.
• This study reveals a novel mechanism linking microRNA activity to ferroptosis.
• The findings underscore the significant role of miRNAs in controlling cell death pathways relevant to cancer.