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Keith W MacRenaris1, Zhidong Ma1, Ruby L Krueger1

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Researchers developed a novel Calcium-activated MRI contrast agent for in vivo imaging of the central nervous system. This agent enables visualization of calcium flux, crucial for understanding neurological events like seizures and ischemia.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Biochemistry

Background:

  • Calcium (Ca(II)) is vital for central nervous system (CNS) electrical activity, neurotransmission, and gene expression.
  • Visualizing in vivo Ca(II) flux in the CNS presents significant challenges.
  • Dysregulated Ca(II) flux is implicated in neuronal damage during conditions like seizures and ischemia.

Purpose of the Study:

  • To develop a novel Ca(II)-activated MRI contrast agent for enhanced in vivo CNS imaging.
  • To overcome limitations in visualizing extracellular vs. intracellular Ca(II) flux.
  • To enable spatiotemporal monitoring of Ca(II) dynamics in neurological conditions.

Main Methods:

  • Development of a new generation Ca(II)-activated MRI contrast agent.
  • Utilized ethyl esters for improved cell labeling and prevention of extracellular Ca(II) binding.
  • Demonstrated cleavage of ethyl esters to enable intracellular Ca(II) binding and increased relaxivity.

Main Results:

  • The developed agent effectively labels cells and binds intracellular Ca(II) after ester cleavage.
  • Achieved enhanced positive MR image contrast due to increased relaxivity upon Ca(II) binding.
  • The probe can discriminate between extracellular and intracellular Ca(II).

Conclusions:

  • The novel Ca(II)-activated MRI contrast agent facilitates in vivo imaging of Ca(II) flux in the CNS.
  • This technology holds potential for diagnosing and understanding neurological disorders characterized by Ca(II) dysregulation.
  • The probe's ability to distinguish extra- and intracellular Ca(II) offers new insights into cellular Ca(II) dynamics.