By moonlighting in the nucleus, villin regulates epithelial plasticity

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• Villin is an actin-binding protein crucial for epithelial cell microvilli and polarity.
• Villin's role extends to promoting epithelial-mesenchymal transition (EMT) in invasive cells.
• The dual function of villin suggests complex regulatory roles in tissue homeostasis and disease.

Purpose of the Study:

• To investigate the novel nuclear moonlighting function of villin.
• To elucidate villin's role in regulating tissue architecture and epithelial-mesenchymal transition (EMT).
• To identify potential therapeutic targets for inhibiting tumorigenesis by targeting nuclear villin.

Main Methods:

• Observation of villin nuclear accumulation during wound repair and hypoxia.
• Analysis of villin's association with mouse models of tumorigenesis and human colorectal cancer specimens.
• Investigating the effect of altered nuclear villin localization on Slug expression and activity.
• Identifying villin's interaction with the transcriptional corepressor ZBRK1.

Main Results:

• Villin accumulates in the nucleus during wound repair and hypoxia, indicating a role in cellular stress responses.
• Nuclear villin is associated with tumorigenesis in mouse models and a subset of colorectal cancers.
• Nuclear villin regulates EMT by modulating Slug expression and activity.
• Villin directly interacts with ZBRK1, a repressor of the Slug promoter.

Conclusions:

• Villin exhibits a moonlighting function in the nucleus, regulating tissue architecture and EMT.
• Nuclear villin and its interaction with ZBRK1 are key regulators of EMT.
• Nuclear villin represents a potential therapeutic target for inhibiting tumorigenesis.