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Updated: May 18, 2026

Immuno-fluorescent Labeling of Microtubules and Centrosomal Proteins in Ex Vivo Intestinal Tissue and 3D In Vitro Intestinal Organoids
Published on: December 13, 2017
Cell confinement controls centrosome positioning and lumen initiation during epithelial morphogenesis.
Alejo E Rodríguez-Fraticelli1, Muriel Auzan, Miguel A Alonso
1Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Cell confinement guides epithelial organ development by controlling cell shape and promoting lumen formation. This finding reveals how physical forces impact tissue morphogenesis and could inform cancer research.
Area of Science:
- Cell Biology
- Developmental Biology
- Biophysics
Background:
- Epithelial organ morphogenesis requires cell polarity and lumen development.
- Extracellular matrix (ECM) properties like stiffness and confinement influence cell behavior.
- The impact of mechanical forces on epithelial morphogenesis remains largely uncharacterized.
Purpose of the Study:
- To investigate the effects of cell confinement on lumen morphogenesis.
- To elucidate the underlying molecular mechanisms of confinement-induced morphogenesis.
Main Methods:
- Utilized a novel micropatterned 3D culture system with Madin-Darby canine kidney cells.
- Analyzed cell spreading, actin contractility, and centrosome positioning under varying confinement levels.
Main Results:
- Cell confinement limits peripheral actin contractility by controlling cell spreading.
- Confinement promotes centrosome positioning and lumen initiation post-cell division.
- The Par-4/LKB1 kinase pathway mediates peripheral actin contractility via RhoA-Rho kinase-myosin II.
Conclusions:
- Cell confinement is a critical regulator of nuclear-centrosomal orientation during 3D epithelial morphogenesis.
- Inhibition of the Par-4/LKB1 pathway can restore lumen initiation in minimally confined cells.
- This study highlights the role of physical forces in directing tissue development.
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