Cell-cell junctions in focus - imaging junctional architectures and dynamics at high resolution.

Area of Science:

• Cell Biology
• Microscopy
• Structural Biology

Background:

• Cell-cell adhesions are vital for tissue integrity and function.
• Understanding the molecular mechanisms of junctional dynamics is crucial for homeostasis, development, and disease.
• Previous studies have provided foundational knowledge but lacked nanoscale resolution.

Purpose of the Study:

• To explore new insights into the nanoscale organization of junctional complexes using advanced microscopy techniques.
• To integrate junctional architectures with membrane morphology and cellular topography.
• To review the roles of associated cytoskeletons, organelles, and plasma membranes in junctional dynamics.

Main Methods:

• Electron microscopy (EM)
• Live fluorescence microscopy
• Super-resolution microscopy
• Volume electron microscopy
• Development and application of biosensors and optogenetic probes.

Main Results:

• Detailed nanoscale organization of tight junctions, adherens junctions, and desmosomes revealed.
• Integration of junctional architecture with membrane and cellular topography.
• Elucidation of the roles of cytoskeletal components, organelles, and plasma membrane in junctional dynamics.

Conclusions:

• Advanced microscopy techniques significantly enhance the understanding of cell-cell adhesion complexity.
• These tools provide critical insights into junctional dynamics across diverse cellular environments.
• Further research using these methods will advance cell biology and disease understanding.