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Multiexponential proton relaxation in model cellular systems.

R S Menon1, M S Rusinko, P S Allen

  • 1Department of Applied Sciences in Medicine, University of Alberta, Edmonton, Canada.

Magnetic Resonance in Medicine
|August 1, 1991
PubMed
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Compartmentalization within cellular systems, not transmembrane exchange, causes multi-exponential relaxation in water proton measurements. Protein adsorption also impacts solute concentration in tissue fluids.

Area of Science:

  • Biophysics
  • Cellular Biology
  • Medical Imaging Physics

Background:

  • Water proton relaxation measurements are crucial for understanding tissue properties in medical imaging.
  • Multiple exponential components in relaxation data have been observed in tissues, but their origins are debated.
  • Previous studies hypothesized various sources, including transmembrane exchange and different tissue types.

Purpose of the Study:

  • To investigate the sources of multiple exponential components in water proton relaxation measurements.
  • To evaluate hypotheses regarding relaxation behavior in model cellular systems.
  • To elucidate the role of compartmentalization and protein adsorption in cellular relaxation.

Main Methods:

  • Utilized red blood cell (RBC) ghosts as a model cellular system.

Related Experiment Videos

  • Measured laboratory frame transverse and longitudinal relaxation rates, and rotating frame relaxation rates.
  • Varied serum albumin concentration in 'extracellular fluid' and compared uniformly mixed versus compartmentalized preparations.

    • Main Results:

    • Transmembrane exchange was too rapid to produce multi-exponential relaxation.
    • Compartmentalization at the cellular level was identified as a direct cause of multiple relaxation components.
    • Protein adsorption to cellular membranes significantly influenced the concentration of freely mobile proteins in surrounding fluids.

    Conclusions:

    • Multi-exponential relaxation in cellular systems can arise from structural compartmentalization, independent of tissue heterogeneity.
    • The findings clarify the origins of complex relaxation patterns observed in biological tissues.
    • Protein adsorption is a critical factor affecting the biophysical environment of tissue fluids.