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Related Concept Videos

Protein-Drug Binding: Determination Methods01:22

Protein-Drug Binding: Determination Methods

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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Patterning Bioactive Proteins or Peptides on Hydrogel Using Photochemistry for Biological Applications
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A rapid method for determining protein diffusion through hydrogels for regenerative medicine applications.

Marian H Hettiaratchi1, Alex Schudel, Tel Rouse

  • 1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive NW, Atlanta, Georgia 30332, USA.

APL Bioengineering
|May 10, 2019
PubMed
Summary

Researchers developed a quick method to measure protein diffusion in hydrogels. This technique helps design better biomaterials for drug delivery by understanding how protein release rates change with molecular weight.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Biophysics

Background:

  • Hydrogels are crucial for delivering proteins and cells in regenerative medicine.
  • Protein diffusion rates in hydrogels vary significantly due to factors like cross-linking density and polymer content.
  • Accurate measurement of protein diffusion is essential for designing effective drug delivery systems.

Purpose of the Study:

  • To develop a simple, rapid, and low-protein-usage method for measuring protein diffusion through various hydrogels.
  • To investigate the relationship between protein molecular weight and diffusion rate in different hydrogel matrices.
  • To create a computational model to predict and validate experimental diffusion coefficients.

Main Methods:

  • Utilized an in vitro capillary tube assay to track protein diffusion along the axial direction.
  • Tested diffusion of proteins with varying molecular weights through alginate, collagen, and poly(ethylene glycol) hydrogels.
  • Developed and employed a computational model to predict and verify experimental protein diffusion coefficients.

Main Results:

  • Protein diffusion rate was inversely correlated with protein molecular weight across all tested hydrogels.
  • The capillary tube method provided accurate measurements of protein diffusion coefficients within hours.
  • The computational model successfully predicted experimental diffusion rates, validating the method.

Conclusions:

  • The described capillary tube method offers a straightforward strategy for assessing protein diffusion in both natural and synthetic hydrogels.
  • This technique facilitates the design of advanced biomaterial-based delivery vehicles with controlled protein release kinetics.
  • Understanding hydrogel-protein interactions is key to optimizing biomaterials for regenerative medicine and drug delivery applications.