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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Liposomes are widely used as drug delivery vehicles.
  • MRI contrast agents enhance image quality but often lack responsiveness.
  • Developing responsive contrast agents is crucial for advanced diagnostics.

Purpose of the Study:

  • To create an ion-responsive MRI contrast agent.
  • To engineer a liposomal scaffold for tunable MRI signal.
  • To investigate the role of membrane properties on relaxivity.

Main Methods:

  • Fabrication of POPC liposomes with cholesterol doping.
  • Encapsulation of Gadolinium-DOTA (Gd-DOTA) within liposomes.
  • Integration of ion carriers into the liposome membrane.
  • Assessment of MRI relaxivity changes in response to ions.

Main Results:

  • Cholesterol-doped liposomes showed dampened MRI response due to reduced water exchange.
  • Incorporation of ion carriers restored and modulated relaxivity.
  • A large amplitude relaxivity switch was observed, demonstrating ion responsiveness.

Conclusions:

  • POPC liposomes can serve as a scaffold for ion-responsive MRI contrast agents.
  • Membrane rigidity and ion flux are key factors in controlling relaxivity.
  • This approach offers a new strategy for developing smart MRI contrast agents.