A direct fluorescence-based technique for cellular localization of amylin
Karen Pillay1, Patrick Govender
1School of Life Sciences, University of KwaZulu-Natal, South Africa.
Biotechnology and Applied Biochemistry
|April 17, 2013
Summary
Amylin protein misfolding is linked to type II diabetes. This study directly observed amylin aggregates forming on cell membranes, measuring 130-800 nm in size.
Area of Science:
- Biochemistry
- Cell Biology
- Diabetes Research
Background:
- Amylin protein misfolding is a key factor in type II diabetes pathogenesis.
- Previous studies suggest amylin interacts with cell membranes, but direct observation is lacking.
Purpose of the Study:
- To directly monitor the association of amylin with cell membranes.
- To characterize the size of amylin aggregates formed on the cell membrane.
Main Methods:
- Confocal microscopy was used to track carboxyfluorescein-labeled amylin in RIN-5F cells.
- Nanoparticle tracking analysis evaluated the size of amylin aggregates.
Main Results:
- Amylin was confirmed to interact with and remain associated with the cell membrane.
- Observed cell membrane-associated amylin aggregates ranged from 130 to 800 nm in size.
Conclusions:
- Direct visualization confirms amylin's association with cell membranes.
- The characterized size of membrane-bound amylin aggregates provides insights into its pathogenic mechanisms in type II diabetes.
Related Concept Videos
01:12Immunofluorescence Microscopy
A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
The...
The...
01:19Protein Dynamics in Living Cells
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...