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A Frequency-Selective pH-Responsive paraCEST Agent.

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Summary
This summary is machine-generated.

This study introduces a novel pH-sensitive paramagnetic chemical exchange saturation transfer (paraCEST) agent. This new agent uses a bound -OH group for pH imaging, overcoming limitations of previous water-based agents.

Keywords:
contrast agentsimaging agentslanthanide complexespH sensingparaCEST

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Area of Science:

  • Biomedical Imaging
  • Chemical Exchange Saturation Transfer (CEST)
  • Paramagnetic Contrast Agents

Background:

  • Paramagnetic chemical exchange saturation transfer (paraCEST) agents are sensitive to pH due to chemical exchange.
  • Previous pH-sensitive paraCEST agents relied on Ln3+-bound water, causing signal broadening.
  • This limits their utility for accurate pH imaging.

Purpose of the Study:

  • To develop a novel pH-sensitive paraCEST agent.
  • To overcome the limitations of T2 exchange-induced line-broadening in existing agents.
  • To enable more precise tissue pH imaging.

Main Methods:

  • Synthesized and characterized a Yb3+ complex (Yb(1)) with a Ln-bound -OH group for CEST.
  • Investigated the pH-dependent CEST peak frequency of Yb(1) across biologically relevant pH ranges.
  • Evaluated the agent's performance in phantom and initial rodent imaging studies.

Main Results:

  • The Yb(1) complex exhibited a single, highly shifted CEST peak from the Yb-OH proton.
  • The peak frequency demonstrated significant pH-dependent shifts (pH 6-8).
  • Phantom imaging confirmed the agent's potential for pH mapping; Gd(1) showed prolonged vascular retention and slow renal clearance.

Conclusions:

  • A novel pH-sensitive paraCEST agent utilizing a Ln-bound -OH group was successfully developed.
  • This agent offers a promising alternative to water-based agents, mitigating signal broadening.
  • The agent shows potential for accurate pH imaging, with observed pharmacokinetic properties in vivo.