lncRNA HOTAIR functions and therapeutic perspectives

Area of Science:

• Molecular Biology
• Epigenetics
• RNA Biology

Background:

• Long non-coding RNAs (lncRNAs) are key regulators of gene expression at transcriptional and post-transcriptional levels.
• The lncRNA HOTAIR is upregulated in cancers and liver fibrosis, acting as a therapeutic target by interacting with chromatin remodelers like PRC2.
• SNAIL recruits HOTAIR/PRC2 to repress epithelial genes, while HNF4a represses HOTAIR expression.

Purpose of the Study:

• To design and validate a dominant-negative lncRNA molecule targeting HOTAIR's interaction with SNAIL.
• To investigate the therapeutic potential of this molecule in reversing cancer-associated phenotypes.

Main Methods:

• Design of a dominant-negative lncRNA (HOTAIR-sbid) lacking EZH2 interaction domain.
• Assessment of HOTAIR-sbid's ability to disrupt SNAIL/EZH2/endogenous HOTAIR complex formation.
• Evaluation of phenotypic changes including epithelial phenotype rescue, reduced epithelial-mesenchymal transition (EMT), and decreased migratory/invasive abilities.

Main Results:

• HOTAIR-sbid successfully impaired the interaction between SNAIL, EZH2, and endogenous HOTAIR.
• PRC2 complex recruitment to SNAIL target genes was inhibited.
• Cells expressing HOTAIR-sbid regained epithelial characteristics and showed reduced EMT, migration, invasion, and anchorage-independent growth.

Conclusions:

• The dominant-negative HOTAIR-sbid molecule effectively blocks HOTAIR-mediated epigenetic repression by SNAIL.
• This approach offers a specific and potentially low-off-target therapeutic strategy for cancers and fibrosis.
• Future work should focus on enhancing RNA stability and delivery methods for clinical application.