Selective Action of the Photosensitizer QLT0074 on Activated Human T Lymphocytes¶
Bibliographic record
Abstract
A new photosensitizer, presently designated QLT0074, may have the potential for the treatment of immune and nonimmune conditions with photodynamic therapy (PDT). The activity of QLT0074 was tested against human peripheral blood T cells and Jurkat T lymphoma cells. At low nanomolar concentrations of QLT0074 in combination with blue light, apoptosis was rapidly induced in Jurkat and blood T cells in vitro as indicated by the expression of the apoptosis-associated mitochondrial 7A6 marker and Annexin-V labeling. Further studies performed with Jurkat T cells showed that PDT-induced apoptosis with QLT0074 was associated with caspase-3 activation and the cleavage of the caspase substrate poly(adenosine diphosphate-ribose)polymerase. Flow cytometry studies revealed that blood T cells with high expression of the interleukin-2 receptor (CD25) took up greater amounts of QLT0074 and were eliminated to a greater extent with PDT than T cells with low levels of this activation marker. This selective action of PDT was confirmed by similar reductions in the percentage of T cells that expressed other activation-related markers, including very late activation antigen-4 (CD49d), human leukocyte antigen DR (HLA-DR), intercellular adhesion molecule-1 (CD54) and Fas (CD95). For activated T cells treated with a specific dose of QLT0074 and light 24 h earlier, CD25 expression density was significantly less, whereas CD54, CD95 and HLA-DR levels were similar to those for control cells treated with light alone. This work shows that PDT with QLT0074 exerts selective, dose-related effects on T cells in vitro.
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How this classification was reachedexpand
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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".