Amplex Red cellular uptake produces radical intermediates by myeloperoxidase and mediates oxidative stress
Bibliographic record
Abstract
Amplex Red (AR) is commonly used to detect extracellular hydrogen peroxide (H 2 O 2 ) and is considered a cell-impermeable compound. However, it would appear capable of entering cells based on its phenoxazine substructure and the report of its mitochondrial membrane permeability. Additionally, myeloperoxidase (MPO) oxidation of AR produces a fluorescent compound, resorufin, which has been reported, though the mechanism is not well-studied. EPR spin trapping using glutathione (GSH) revealed that AR metabolism produced AR radicals and glutathionyl radicals (GS • ). An intermediate metabolite, 3,7-dihydroxyphenoxazine, was observed by liquid chromatography-mass spectrometry (LC-MS), which supported AR radical disproportionation first and subsequently N-oxidation. Besides, in the presence of GSH, the formation of resorufin decreased significantly evidencing the reactivity of radical intermediates. Three types of AR-GS adduct were found using LC-MS and the resorufin GS-adduct was the dominant one. Regarding intracellular findings in HL-60 cells (that highly express MPO), LC-MS and fluorescence analysis showed AR penetrated the cell membrane and was oxidized by cellular MPO. Interestingly, we demonstrated that the oxidation of AR in HL-60 cells showed a significant time dependence; PF-1355, an MPO inhibitor, inhibited the oxidation of AR by MPO. Cell viability (ATP) revealed that 200 μM AR significantly decreased viability in HL-60 cells in 6 h. We also found that AR-mediated decreased total GSH and increased protein-radical formation. These findings revealed that AR is cell-permeable, and AR radicals induce cellular oxidative distress and lead to the formation of protein radicals, which correlate with the MPO-mediated mechanism of cytotoxicity. • Amplex Red radical metabolites can conjugate with GSH. • Amplex Red radical metabolites increase the production of glutathionyl radicals. • Amplex Red is a cell-permeable compound. • Amplex Red can be used to determine H 2 O 2 levels in peroxidase-containing cells. • Amplex Red myeloperoxidase metabolism induces the formation of protein radicals.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".