Rationally induced RNA:DNA G-quadruplex structures elicit an anticancer effect by inhibiting endogenous eIF-4E...

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• RNA G-quadruplexes (GQs) regulate crucial cellular processes like translation and mRNA targeting.
• eIF-4E is vital for translation initiation and is overexpressed in many cancers, making it a key therapeutic target.

Purpose of the Study:

• To develop a strategy for targeted gene knockdown by inducing RNA GQs on specific mRNAs.
• To investigate the potential of inhibiting eIF-4E expression to achieve antiproliferative effects in cancer cells.

Main Methods:

• Designed and synthesized hybrid (RNA:DNA) oligonucleotide sequences to induce G-quadruplex structures on eIF-4E mRNA.
• Utilized biophysical and biochemical methods to confirm stable G-quadruplex formation.
• Assessed the efficacy of induced GQs in repressing reporter gene expression and endogenous eIF-4E levels in human cancer cells.

Main Results:

• Stable RNA G-quadruplex formation was confirmed at physiologically relevant salt concentrations.
• Induced GQs in the 5'-UTR and protein-coding region of eIF-4E mRNA led to 30% and 60% inhibition of protein expression, respectively.
• Treatment with GQ-inducing sequences decreased human cancer cell viability in a dose-dependent manner.

Conclusions:

• Harnessing RNA G-quadruplexes offers a novel strategy for targeted modulation of endogenous gene expression.
• This approach demonstrates potential for cancer therapy by downregulating oncogenic targets like eIF-4E.
• The study opens new avenues for developing RNA-based therapeutics for cancer treatment.