| Assay Method Information | |
| | AChE inhibition |
| Description: | To address these issues, the present disclosure relates to the development and utilization of a (−)-phenserine extended release formulation. To reach a formulation consistent with the pharmacokinetics of phenserine and its metabolites we systematically studied (−)-phenserine pharmacokinetics and assessment using acetylcholinesterase (AChE) inhibtion pharmacodynamics as an indicator of the total active drug plus metabolite activities present. Without being bound to any theory, the drug and each of the metabolites are active inhibitors of AChE. Table 1 reveals that at 34% AChE inhibition in RBCs the metabolism and the brain; plasma partitioning of drug and metabolite produce estimated brain concentrations as required in excess of the EC50 concentrations and in excess of those found in earlier studies of (−)-phenserine. These concentrations are consistent with the concentrations associated with the dosing of mice in anoxia and concussion model studies using FDA animal: human equivalent dose standards and in vitro mechanistic studies (see e.g., FDA (2005) Guidance for Industry Estimating the Maximum Safe Starting Dose in Initial Clinical Trials for Therapeutics in Adult Healthy Volunteers; available at www(dot)fda(dot)gov/downloads/Drugs/Guidances/UCM078932 (dot)pdf%23search=%27guidekines+for+industry+sfe+starting%27. Consequently, using RBC AChE inhibition as a pharmacodynamics marker of total drug/metabolite activities we have adopted a 35-50% preliminary RBC AChE inhibition as the blood biomarker target for steady-state brain effects from dosing. |
| Affinity data for this assay | |
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