A sense-antisense RNA interaction promotes breast cancer metastasis via regulation of NQO1 expression

Area of Science:

• Molecular Biology
• Cancer Research
• Genetics

Background:

• Antisense RNAs are abundant but their functions in human cells remain largely unknown.
• Understanding the roles of these RNAs is crucial for advancing cancer research.

Purpose of the Study:

• To profile antisense RNAs in breast cancer cell lines, specifically MDA-MB-231 and its lung metastatic derivative.
• To identify and characterize novel antisense RNAs involved in cancer progression and metastasis.

Main Methods:

• Profiling of antisense RNAs in distinct breast cancer cell lines.
• Gene knockdown experiments targeting NQO1 and the identified antisense RNA (NQO1-AS).
• In vivo mouse models to assess lung colonization and therapeutic interventions.

Main Results:

• Identification of NQO1-AS, an antisense RNA that upregulates NADPH quinone dehydrogenase 1 (NQO1), promoting cancer progression.
• Knockdown of NQO1 or NQO1-AS significantly reduced lung metastasis in a mouse model.
• NQO1 was found to protect breast cancer cells against oxidative damage and ferroptosis, a vulnerability exploitable therapeutically.

Conclusions:

• NQO1-AS plays a critical role in breast cancer progression by post-transcriptionally regulating its sense mRNA.
• Targeting the NQO1 pathway, by inducing ferroptosis and inhibiting NQO1, presents a potential therapeutic strategy for lung-metastatic breast cancer.
• The findings are primarily applicable to female breast cancer patients due to the use of female-origin disease models.