Molecular imaging of neuroinflammation in Alzheimer's disease and mild cognitive impairment.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic search or meta-analysis
PubMed 28533150 · doi:10.1016/j.pnpbp.2017.05.007
What was done
The authors conducted a narrative review of human in vivo Positron Emission Tomography (PET) studies targeting the 18kDa Translocator Protein (TSPO) to evaluate microglial activation in Alzheimer's disease and mild cognitive impairment compared to healthy volunteers, alongside methodological considerations of imaging microglial activation.
What was found
The abstract reports no numerical data or effect sizes. Most studies demonstrated increased TSPO radioligand binding in Alzheimer's disease populations compared with healthy controls. In mild cognitive impairment, findings were conflicting, with some studies showing increased TSPO binding and others finding no difference compared to controls.
Why it matters
Understanding the timing of microglial activation helps determine whether neuroinflammation is an early driver or a late secondary response in Alzheimer's disease progression.
Limits
The abstract provides no sample sizes, study counts, or quantitative statistical results. As a narrative review rather than a systematic review, it lacks formal study selection criteria and quality assessment. Results in prodromal stages remain inconsistent across studies.
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