Current biology, 2013-04, Vol.23 (8), p.731-736
2013
Details
- Autor(en) / Beteiligte
- Titel
- NMII Forms a Contractile Transcellular Sarcomeric Network to Regulate Apical Cell Junctions and Tissue Geometry
- Ist Teil von
- Current biology, 2013-04, Vol.23 (8), p.731-736
- Ort / Verlag
- England: Elsevier Inc
- Erscheinungsjahr
- 2013
- Link zum Volltext
- Quelle
- Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
- Beschreibungen/Notizen
- Nonmuscle myosin II (NMII) is thought to be the master integrator of force within epithelial apical junctions, mediating epithelial tissue morphogenesis and tensional homeostasis [1–3]. Mutations in NMII are associated with a number of diseases due to failures in cell-cell adhesion [4–8]. However, the organization and the precise mechanism by which NMII generates and responds to tension along the intercellular junctional line are still not known. We discovered that periodic assemblies of bipolar NMII filaments interlace with perijunctional actin and α-actinin to form a continuous belt of muscle-like sarcomeric units (∼400–600 nm) around each epithelial cell. Remarkably, the sarcomeres of adjacent cells are precisely paired across the junctional line, forming an integrated, transcellular contractile network. The contraction/relaxation of paired sarcomeres concomitantly impacts changes in apical cell shape and tissue geometry. We show differential distribution of NMII isoforms across heterotypic junctions and evidence for compensation between isoforms. Our results provide a model for how NMII force generation is effected along the junctional perimeter of each cell and communicated across neighboring cells in the epithelial organization. The sarcomeric network also provides a well-defined target to investigate the multiple roles of NMII in junctional homeostasis as well as in development and disease. [Display omitted] ► NMII within epithelial junctions assembles into a chain of muscle-like sarcomeres. ► Sarcomeres are paired across the junction to form transcellular contractile units. ► NMII isoforms show differential expression across heterotypic cell junctions. ► Coordinated sarcomere contractility modulates apical cell shape and tissue geometry
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0960-9822eISSN: 1879-0445DOI: 10.1016/j.cub.2013.03.039Titel-ID: cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_3658137
- Format
- –
- Schlagworte
- actin, Actin Cytoskeleton - metabolism, Actinin - metabolism, Actins - metabolism, adhesion, Animals, epithelial cells, Heterocyclic Compounds, 4 or More Rings - metabolism, homeostasis, intercellular junctions, Intercellular Junctions - metabolism, Mice, Microscopy, Fluorescence, morphogenesis, mutation, myosin, Myosin Heavy Chains - genetics, Myosin Heavy Chains - metabolism, Myosin Type II - genetics, Myosin Type II - metabolism, Organ of Corti - metabolism, Rats, sarcomeres