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Imaging Traumatic Brain Injuries in Mice with Potassium Channel PET Tracer [18F]3F4AP.

Karla M Ramos-Torres1, Amal Tiss1, Kryslaine L Radomski2

  • 1Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA.

Journal of Neurotrauma
|April 7, 2026
PubMed
Summary

Positron emission tomography (PET) tracer [18F]3F4AP effectively detects demyelination after traumatic brain injury (TBI). This imaging approach shows high sensitivity for penetrating injuries, aiding TBI assessment.

Keywords:
[18F]3F4APdemyelinationmouse studypositron emission tomographytraumatic brain injury

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Area of Science:

  • Neuroscience
  • Radiochemistry
  • Medical Imaging

Background:

  • Traumatic brain injury (TBI) can cause secondary axon and myelin damage, leading to lasting neurological deficits.
  • Assessing TBI-related demyelination and node of Ranvier disruption is crucial for understanding injury progression.
  • Voltage-gated potassium (KV) channels are implicated in TBI pathophysiology.

Purpose of the Study:

  • To evaluate the efficacy of the novel positron emission tomography (PET) tracer [18F]3F4AP in detecting demyelination in mouse models of TBI.
  • To compare the tracer's performance in penetrating (controlled cortical impact, CCI) versus non-penetrating (concussive) TBI models.
  • To correlate PET imaging findings with histological evidence of myelin loss.

Main Methods:

  • Induction of TBI in mice using either CCI or concussive models.
  • Dynamic PET imaging with [18F]3F4AP at multiple time points post-injury (0, 3, 7, 14, 28-31 days).
  • Quantitative analysis of tracer uptake in injured versus control brain regions and Luxol fast blue staining for myelin evaluation.

Main Results:

  • In the CCI model, [18F]3F4AP PET showed a 31% increase in tracer uptake at the injury site by 7 days post-injury, correlating with demyelination.
  • Tracer uptake decreased over time in the CCI model, suggesting potential remyelination.
  • The concussive TBI model exhibited a less pronounced and more diffuse increase in [18F]3F4AP uptake compared to CCI.

Conclusions:

  • [18F]3F4AP PET imaging is a sensitive tool for detecting demyelination following TBI, particularly penetrating injuries.
  • The tracer's uptake patterns may reflect dynamic changes like remyelination post-TBI.
  • This PET tracer holds promise as a biomarker for assessing TBI progression and treatment response.