NOVA1 acts as an oncogenic RNA-binding protein to regulate cholesterol homeostasis in human glioblastoma cells

Area of Science:

• Neuro-oncology
• Molecular Biology
• Cancer Research

Background:

• NOVA1, a neuronal RNA-binding protein, is linked to paraneoplastic opsoclonus-myoclonus ataxia and cancer.
• The precise role of NOVA1 in cancer biology, particularly glioblastoma multiforme (GBM), remains largely unexplored.
• Understanding NOVA1's function is crucial for developing targeted cancer therapies.

Purpose of the Study:

• To investigate the oncogenic role of NOVA1 in glioblastoma multiforme (GBM).
• To elucidate the molecular mechanisms by which NOVA1 contributes to GBM cell viability.
• To identify potential therapeutic targets for inhibiting NOVA1's oncogenic functions.

Main Methods:

• Utilized a patient-derived glioblastoma multiforme (GBM) cell line.
• Performed Argonaute (AGO) and NOVA1 crosslinking immunoprecipitation (CLIP) to identify RNA targets.
• Quantified transcript levels following NOVA1 knockdown and employed antisense oligonucleotides for inhibition.

Main Results:

• NOVA1 functions as an oncogenic factor in GBM, promoting cancer cell fitness.
• NOVA1 and AGO-miRNA pathways share common 3' untranslated region (UTR) targets in GBM.
• NOVA1 stabilizes transcripts involved in cholesterol homeostasis, enhancing GBM cell viability.
• Selective inhibition of NOVA1-RNA interactions with antisense oligonucleotides reduced GBM cell fitness.

Conclusions:

• NOVA1 is overexpressed in GBM and antagonizes AGO2-miRNA activity.
• NOVA1 promotes GBM cell viability by up-regulating cholesterol synthesis.
• Targeting NOVA1-RNA interactions represents a promising therapeutic strategy for GBM.