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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy
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Probing Interactions between Aggrecan and Mica Surface by the Atomic Force Microscopy.

Preethi L Chandran1, Emilios K Dimitriadis, Peter J Basser

  • 1Section on Tissue Biophysics and Biomimetics, Program in Pediatric Imaging and Tissue Sciences, Eunice Kennedy Shriver National Institute of Child Health and Human Development , National Institutes of Health, Bethesda, MD 20892.

Journal of Polymer Science. Part B, Polymer Physics
|April 5, 2012
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Summary

Aggrecan adsorption on charged surfaces depends on the ionic environment. This study visualizes aggrecan structure using Atomic Force Microscopy, revealing distinct behaviors on positive and negative mica surfaces.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Extracellular Matrix Biology

Background:

  • Aggrecan, a major cartilage component, possesses highly charged glycosaminoglycan (GAG) chains crucial for osmotic pressure and load resistance.
  • Aggrecan's behavior in solution is largely independent of calcium ions but exhibits distinct osmotic pressure regimes.
  • Understanding aggrecan's interaction with charged surfaces is vital for its role in biological tissues and biomaterial integration.

Purpose of the Study:

  • To investigate the impact of the ionic environment on the structural conformation of aggrecan molecules adsorbed onto mica surfaces.
  • To visualize aggrecan adsorption and assembly using Atomic Force Microscopy (AFM).
  • To elucidate the influence of surface charge and salt composition on aggrecan structure.

Main Methods:

  • Atomic Force Microscopy (AFM) was employed to visualize aggrecan conformation.
  • Controlled mica surfaces with varying charges (positively charged APS mica and negatively charged mica) were utilized.
  • The effect of different ionic environments (salt composition) on adsorbed aggrecan was examined.

Main Results:

  • On positively charged mica, aggrecan GAG chains were distinguishable and largely unaffected by salt ions, forming clusters and eventually a continuous monolayer with increasing concentration.
  • On negatively charged mica, aggrecan adsorption levels varied significantly with salt composition.
  • The structural organization of adsorbed aggrecan is highly sensitive to the surface charge and ionic strength.

Conclusions:

  • The ionic environment and surface charge critically influence aggrecan adsorption and structural organization.
  • Aggrecan exhibits distinct conformational responses to positively and negatively charged surfaces.
  • Insights into aggrecan-surface interactions are crucial for understanding cartilage mechanics and designing biocompatible materials.