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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Self-Assembled Nanomicelles as MRI Blood-Pool Contrast Agent.

Andrej Babič1, Vassily Vorobiev1, Céline Xayaphoummine1

  • 1Pharmaceutical Technology, School of Pharmacy Geneva-Lausanne, University of Geneva, Rue Michel Servet 1, 1211, Geneva, Switzerland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 10, 2017
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Summary

New gadolinium-loaded nanomicelles (Tyr-MRI) offer enhanced MRI contrast. These supramolecular agents show high relaxivity and long circulation times, making them promising blood-pool contrast agents for improved diagnostics.

Keywords:
contrast agentgadoliniummagnetic resonance imagingnanomicellesself-assembly

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Area of Science:

  • Nanotechnology
  • Biomedical Imaging
  • Materials Science

Background:

  • Gadolinium-based contrast agents (GBCAs) are crucial for magnetic resonance imaging (MRI).
  • Existing GBCAs face limitations in relaxivity and circulation time.
  • Nanomicellar structures offer potential for improved GBCA performance.

Purpose of the Study:

  • To synthesize and characterize novel gadolinium-loaded nanomicelles for MRI.
  • To evaluate the potential of these nanomicelles as blood-pool contrast agents.
  • To assess their relaxivity, cytotoxicity, and in vivo performance.

Main Methods:

  • Synthesis of a novel amphiphilic building block using l-tyrosine, C18 chains, Gd-DO3A, and PEG.
  • Spontaneous self-assembly into monodispersed 10-20 nm nanomicelles in water.
  • Evaluation of relaxivity, cytotoxicity, and in vivo blood-pool imaging in animal models.

Main Results:

  • Successfully synthesized Gd-loaded nanomicelles (Tyr-MRI) with a core-shell architecture.
  • Achieved high proton relaxivity (29 mM⁻¹ s⁻¹) at low field strength.
  • Demonstrated low cytotoxicity, good contrast enhancement in vivo, and prolonged blood circulation time.

Conclusions:

  • Tyr-MRI nanomicelles represent a promising new class of supramolecular MRI contrast agents.
  • Their properties are suitable for blood-pool imaging applications.
  • Further development could lead to improved diagnostic capabilities in MRI.