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Related Concept Videos

Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
Simplification of a Force and Couple System: II01:23

Simplification of a Force and Couple System: II

In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.

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Related Experiment Video

Updated: Jun 14, 2026

Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
10:51

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Random Metastructures for Nanoscale Visualization of Single-Exosome Dynamics in a Gut-Brain-Axis-on-a-Chip.

Hongki Lee1, Gwang Myeong Seo2, Hajun Yoo1

  • 1School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea.

ACS Nano
|August 14, 2025
PubMed
Summary

This study presents a novel nanophotonic biosensor to observe exosome communication along the gut-brain axis. The system enables real-time, high-resolution tracking of exosomes between gastrointestinal and neural cells.

Keywords:
exosomesgut−brain-axis-on-a-chipmetastructuresmicrofluidic chipstructured illumination microscopysuper-resolution microscopy

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Cell Biology

Background:

  • The gut-brain axis involves complex bidirectional communication.
  • Exosomes are key mediators of this intercellular communication.
  • Understanding exosome dynamics is crucial for neurological and gastrointestinal health.

Purpose of the Study:

  • To develop and demonstrate an innovative nanophotonic biosensor system.
  • To investigate exosome dynamics and intercellular communication within a gut-brain axis model.
  • To achieve real-time, super-resolution imaging of exosome transport and interaction.

Main Methods:

  • Utilized a nanophotonic biosensor integrated with microfluidic technology.
  • Incorporated coculture environments of relevant cell types.
  • Employed super-resolution imaging for visualizing exosomes and live cells.

Main Results:

  • Enabled real-time observation of long-range exosome dynamics.
  • Achieved superior spatial resolution for individual exosome visualization.
  • Demonstrated microfluidic control over exosome secretion, transport, and recipient cell interaction.

Conclusions:

  • The developed biosensor system effectively visualizes exosome dynamics in a gut-brain axis model.
  • This technology provides new insights into exosome-mediated communication.
  • Potential applications in understanding disease mechanisms and developing therapeutics.