Selective Up-Regulation of Tumor Suppressor Gene Retinoblastoma by Bisacridine Derivative Through Gene Promoter...

Area of Science:

• Oncology
• Molecular Biology
• Drug Discovery

Background:

• The retinoblastoma (RB) gene is a critical tumor suppressor frequently mutated in various cancers.
• Targeting RB expression presents a promising anti-cancer strategy.
• G-quadruplex and i-motif DNA structures on the RB promoter act as regulatory switches.

Purpose of the Study:

• To identify small molecules that can modulate RB gene expression by targeting promoter DNA structures.
• To investigate the potential of targeting both G-quadruplex and i-motif structures for cancer therapy.

Main Methods:

• Screening of small molecules for selective binding and destabilization of G-quadruplex and i-motif structures on the RB promoter.
• Assessing the effect of candidate molecules on RB gene transcription and translation.
• Evaluating anti-tumor activity in vitro (Hela cells) and in vivo (Hela xenograft mouse model).

Main Results:

• The bisacridine derivative A06 selectively bound and destabilized both G-quadruplex and i-motif structures on the RB promoter.
• A06 significantly increased RB gene transcription and translation, inhibiting tumor cell proliferation and metastasis.
• A06 demonstrated potent anti-tumor activity in Hela cells and xenograft models with minimal toxicity; A02 showed weaker effects.

Conclusions:

• This study demonstrates the first successful up-regulation of a tumor suppressor gene (RB) by destabilizing both G-quadruplex and i-motif promoter structures.
• A06 represents a novel therapeutic strategy for cancer treatment by reactivating tumor suppressor pathways.
• Targeting these unique DNA structures offers a new avenue for innovative anti-cancer drug development.