Hsa_circ_0046264 up-regulated BRCA2 to suppress lung cancer through targeting hsa-miR-1245

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Lung cancer remains a leading cause of global mortality.
• Advances in gene microarray technology facilitate the identification of novel circular RNAs.
• Circular RNAs play crucial roles in various biological processes and diseases.

Purpose of the Study:

• To investigate the biological functions and molecular mechanisms of hsa_circ_0046264 in lung cancer.
• To explore the potential of hsa_circ_0046264 as a biomarker for early lung cancer diagnosis and clinical treatment.

Main Methods:

• Differential gene expression analysis using gene microarray data.
• Bioinformatics analysis and luciferase reporter assays to identify downstream targets.
• Quantitative Reverse Transcription Polymerase Chain Reaction (QRT-PCR) and Western blot for RNA and protein level detection.
• In vitro assays (MTT, flow cytometry, DNA damage assay) and in vivo tumor formation studies in nude mice.

Main Results:

• Hsa_circ_0046264 and BRCA2 were found to be downregulated in lung cancer tissues, while miR-1245 was upregulated.
• Hsa_circ_0046264 suppressed lung cancer cell proliferation and invasion while inducing apoptosis, mediated by targeting miR-1245 to upregulate BRCA2.
• In vivo studies demonstrated that hsa_circ_0046264 inhibited tumor growth.

Conclusions:

• Hsa_circ_0046264 functions as a tumor suppressor in lung cancer.
• Overexpression of hsa_circ_0046264 can enhance BRCA2 expression by reducing miR-1245 levels.
• Hsa_circ_0046264 holds promise for novel therapeutic strategies and diagnostic applications in lung cancer.