Abstract 285: Development of phenyl 4-(2-oxo-3-alkylimidazolidin-1-yl)benzenesulfonates as new antimitotic cytochrome P450 1A1-activated prodrugs selective toward breast cancers: Evaluation of branched alkyl chains
Bibliographic record
Abstract
Abstract Enzyme-based prodrug treatments are innovative approaches that enable to convert a prodrug to a potent anticancer agent directly into the tumoral site. It is in this context that we recently discovered a new family of antimitotics that are CYP1A1-activated prodrugs referred to as phenyl 4-(2-oxo-3-alkylimidazolidin-1-yl)benzenesulfonates (PAIB-SOs). PAIB-SOs are highly selective toward breast cancer cells, exhibit antiproliferative activity in the nanomolar range, arrest the cell cycle progression in G2/M phase and disrupt the microtubule integrity. Further studies have evidenced that the selectivity of PAIB-SOs toward mammary cancer cells is related to their N-dealkylation into potent phenyl 4-(2-oxoimidazolidin-1-yl)-benzenesulfonates (PIB-SOs) by CYP1A1 directly into breast cancer cells. In this study, we designed and prepared new PAIB-SOs bearing N-branched alkyl chains on the imidazolidin-2-one moiety and evaluated their antiproliferative activity, selectivity toward breast cancer cells and finally their potential toxic effects. Antiproliferative activity was assessed using the sulforhodamine B method. PAIB-SO selectivity was determined using breast cancer cells expressing CYP1A1 (MCF7 and MDA-MB-468) and those not expressing it (MDA-MB-231). In addition, UHPLC-UV detection method was used to evaluate the CYP1A1-biotransformation of PAIB-SOs into their antimitotic PIB-SO counterparts. The mechanism of action of PAIB-SOs was studied by evaluating first, the cell cycle progression of MCF7 cells by flow cytometry and second the microtubules integrity by immunofluorescence staining. Finally, PAIB-SOs potential toxicity was assessed in vitro toward HaCat and HEK-293 primary cells and in ovo using the chick embryos model. PAIB-SOs bearing isopropyl and sec-butyl lose their selectivity toward breast cancer cells and show moderate antiproliferative activity (micromolar range). However, PAIB-SOs bearing an isobutyl group maintain their selectivity toward breast cancer cells expressing CYP1A1 and exhibit antiproliferative activity within the nanomolar range. In addition, enzymatic assays show that PAIB-SOs bearing an isobutyl group are metabolized into PIB-SOs in presence of CYP1A1 in contrast to isopropyl or sec-butyl substituted compounds. Moreover, our most potent PAIB-SOs arrest the cell cycle in the G2/M-phase and disrupt the cytoskeleton. Finally, HaCat and HEK-293 cells are unaffected by PAIB-SOs treatment which also exhibits a low toxicity toward the chick embryos. This study demonstrates that CYP1A1 can accommodate bulky groups and PAIB-SOs bearing an isobutyl group are potent new CYP1A1-activated prodrug derivatives exhibiting high selectivity toward breast cancer cells and low toxic effects. Citation Format: Chahrazed Bouzriba, Atziri Corin Chavez Alvarez, Mathieu Gagné-Boulet, Jacques Lacroix, Marie-France Côté, René C.-Gaudrault, Sébastien Fortin. Development of phenyl 4-(2-oxo-3-alkylimidazolidin-1-yl)benzenesulfonates as new antimitotic cytochrome P450 1A1-activated prodrugs selective toward breast cancers: Evaluation of branched alkyl chains [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 285.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".