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Updated: Jul 13, 2025

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Adhesion-based capture stabilizes nascent microvilli at epithelial cell junctions
Caroline S Cencer1, Jennifer B Silverman1, Leslie M Meenderink2
1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.
Epithelial cells form a brush border using intermicrovillar adhesion complexes (IMACs) to stabilize new microvilli at cell junctions. This marginal capture mechanism is crucial for developing mature apical specializations.
Area of Science:
- Cell Biology
- Epithelial Biology
- Biophysics
Background:
- Epithelial cells develop apical brush borders with microvilli to enhance solute transport.
- Intermicrovillar adhesion complexes (IMACs) link microvilli but their role in initial microvilli formation is unknown.
Purpose of the Study:
- To investigate the role of IMACs in the initial assembly of microvilli during epithelial differentiation.
Main Methods:
- Live imaging of differentiating epithelial cells (mouse, human, porcine).
- Analysis of protocadherin-containing IMACs at cell junctions.
- Investigating the role of junctional tension in IMAC stability.
Main Results:
- Nascent microvilli initially accumulate at cell margins, spanning junctions.
- Transjunctional IMACs, stabilized by junctional tension, link neighboring cell protrusions.
- Marginal microvilli accumulation precedes and drives medial microvilli formation.
Conclusions:
- A marginal capture mechanism, dependent on transjunctional IMACs, stabilizes nascent microvilli.
- This process is essential for the assembly of apical specializations in diverse epithelial systems.
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