Related Experiment Video
Updated: Apr 12, 2026
Pattern Generation for Micropattern Traction Microscopy
Published on: February 17, 2022
Interfacial force-driven pattern formation during drying of Aβ (25-35) fibrils
Ayantika Sett1, Sudipta Bag2, Swagata Dasgupta2
1Department of Chemical Engineering, Indian Institute of Technology Kharagpur, India.
Abstract:
Pattern formation during evaporation of biofluids finds significant applications in the biomedical field for disease identification. Aβ (25-35) is the smallest peptide in the amyloid peptide family that retains the toxicity of a full length peptide responsible for Alzheimer's disease and is chosen here as the model solute. Drying experiments on substrates of varying wettability exhibit unique drying patterns of Aβ (25-35) fibrils visualized through fluorescence microscopy and transmission electron microscopy. The unique pattern formations can be interpreted as manifestations of the changes in the self-pinning mechanism with changes in wettability, which in some cases resembles the well-known coffee ring effect. Additionally, the delicate balance between the drag and capillary forces has been perturbed by initiating controlled rates of evaporation and probing their effects on the fibril patterning.
Insights
Alzheimer's disease research is advanced by studying amyloid-beta (25-35) fibril patterns during biofluid evaporation. Evaporation patterns on different surfaces reveal insights into disease mechanisms and potential diagnostic markers.
Area of Science:
- Biomedical Engineering
- Materials Science
- Neuroscience
Background:
- Pattern formation during biofluid evaporation has biomedical applications for disease identification.
- Amyloid-beta (25-35) peptide is a toxic fragment associated with Alzheimer's disease.
Purpose of the Study:
- To investigate the drying patterns of amyloid-beta (25-35) fibrils on substrates with varying wettability.
- To understand how substrate wettability influences fibril self-assembly and pattern formation during evaporation.
Main Methods:
- Drying experiments using amyloid-beta (25-35) fibrils as a model solute.
- Visualization of fibril patterns using fluorescence microscopy and transmission electron microscopy.
- Controlled manipulation of evaporation rates to study drag and capillary forces.
Main Results:
- Unique drying patterns of amyloid-beta (25-35) fibrils were observed, dependent on substrate wettability.
- Pattern formation was linked to changes in the self-pinning mechanism, sometimes resembling the coffee ring effect.
- Altering evaporation rates affected the balance of forces, influencing fibril patterning.
Conclusions:
- Substrate wettability significantly impacts amyloid-beta (25-35) fibril self-assembly and pattern formation during drying.
- The study provides insights into the physical mechanisms governing amyloid fibril deposition, relevant to Alzheimer's disease.
- Controlled evaporation offers a method to probe and potentially manipulate amyloid fibril patterning for diagnostic or therapeutic strategies.
Related Concept Videos
01:22Protein Folding
03:03Amyloid Fibrils
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
00:57Formation of Intermediate Filaments
01:39Mechanism of Filopodia Formation
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
01:14Generation of Straight or Branched Actin Filaments
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
01:11Formation of Higher-order Actin Filaments
The high-order actin...