Physiologically‐Based Kinetic Modeling Predicts Similar In Vivo Relative Potency of Senecionine N‐Oxide for Rat and Human at Realistic Low Exposure Levels

Scope: This study aims to determine if previously developed physiologically-based kinetic (PBK) model in rat can be modified for senecionine (SEN) and its N-oxide (SENO), and be used to investigate potential species differences between rat and human in relative potency (REP) of the N-oxide relative to the parent pyrrolizidine alkaloid (PA).
Methods and Results: In vitro derived kinetic parameters including the apparent maximum velocities (Vmax) and Michaelis-Menten constants (Km) for SENO reduction and SEN clearance were used to define the PBK models. The rat model was validated with published animal data, and the toxicokinetic profiles of SEN from either orally-administered SENO or SEN were simulated. REP values of SENO relative to SEN amounted to be 0.84 and 0.89 in rat and human, respectively.
Conclusion: The REP value can be dose- and species-dependent, with the values for rat and human being comparable at low realistic exposure scenarios. In summary, PBK modelling serves as a valuable New Approach Methodology (NAM) tool for predicting REP values of PA-N-oxides and may actually result in more accurate REP values for human risk assessment than what would be defined using in vivo animal experiments.