Related Experiment Video
Updated: May 29, 2026
07:20
Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
Published on: April 25, 2019
Overview: imaging in the study of integrins
1Center for Vascular Biology Research, Division of Molecular and Vascular Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. ccarman@bidmc.harvard.edu
Methods in Molecular Biology (Clifton, N.J.)
|September 13, 2011
Summary
Microscopy techniques reveal how integrins (cell adhesion molecules) dynamically regulate cell behavior. Advanced imaging methods provide new insights into integrin function in various biological processes.
Area of Science:
- Cell Biology
- Biophysics
- Molecular Imaging
Background:
- Integrins are crucial for cell adhesion, signaling, and various physiological processes like development, immunity, and cancer.
- Their function relies on dynamic modulation of adhesiveness and signaling via conformational changes and interactions.
- Previous genetic, biochemical, and structural studies provided foundational knowledge but lacked insights into dynamic cellular behavior.
Purpose of the Study:
- To provide an overview of light microscopy imaging approaches used to study integrin dynamics in intact cells.
- To highlight how these advanced imaging techniques have enhanced our understanding of integrin function and regulation.
Main Methods:
- Utilized a range of fluorescence-based light microscopy techniques.
- Employed optical sectioning methods (confocal, multiphoton) and TIRF microscopy.
- Incorporated novel Super-Resolution techniques and diverse imaging modalities (IRM, FRET, FRAP, CALI, fluorescence speckle imaging).
Main Results:
- Demonstrated the application of various microscopy techniques to investigate integrin behavior.
- Showcased how these methods address specific aspects of integrin function and regulation.
- Illustrated the advancements in understanding integrin dynamics through imaging.
Conclusions:
- Light microscopy, particularly fluorescence-based techniques, is essential for studying dynamic integrin behaviors in living cells.
- Advanced imaging modalities have significantly improved our comprehension of integrin roles in cellular processes.
- Future research can leverage these techniques for deeper insights into integrin-mediated cellular functions.
Related Concept Videos
01:15Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
01:10Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
01:17Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
01:24Overview of Cell-Matrix Interactions
The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
01:31Immunoglobulin-like Cell Adhesion Molecules
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...