Radiosynthesis of a Novel <sup>11</sup> C‐Labeled Derivative of 4’‐ <i>O</i> ‐Methylhonokiol and Its Preliminary Evaluation in an LPS Rat Model of Neuroinflammation
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Bibliographic record
Abstract
Abstract Cyclooxygenase type 2 (COX‐2) is an attractive biomarker for the visualization of neuroinflammation processes by positron emission tomography (PET). Neolignan 4’‐ O ‐methylhonokiol (MH) is known to have high anti‐inflammatory activity and inhibits the expression of COX‐2. We synthesized 4′‐[ 11 C]methoxy‐5‐propyl‐1,1′‐biphenyl‐2‐ol ([ 11 C]MPbP), a compound based on the MH structure and labeled with carbon‐11 (T 1/2 =20.4 min) and studied its distribution in rats treated with lipopolysaccharide (LPS). It was shown that the new ligand has significant inhibitory activity against COX‐2 (IC 50 =0.14 μM) and sufficient lipophilicity (logD 7.4 =2.46±0.12) for penetration the blood brain barrier (BBB). [ 11 C]MPbP was obtained by 11 C‐methylation using [ 11 C]CH 3 I with decay‐corrected radiochemical yield of 20% based on [ 11 C]CH 3 I with molar activity 10–15 GBq/μmol, high radiochemical purity (> 99%) and low level of chemical impurities (<1 μg/ml). The radioligand did not undergo any noticeable decomposition in human plasma for 40 min. The results of ex vivo biodistribution in rats demonstrated that [ 11 C]MPbP crossed the BBB and the observed radioactivity uptake in brain of rats with LPS‐induced neuroinflammation was 4 times higher than in intact animals. Further studies of compounds with the MH scaffold are planned for their possible application in PET, including in vivo assessment in animal neuroinflammation models.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it