Heterogeneous drug tissue binding in brain regions of rats, Alzheimer's patients and controls: impact on translational drug development.
Sofia GustafssonDag SehlinErik LampaMargareta Hammarlund-UdenaesIrena LoryanPublished in: Scientific reports (2019)
For preclinical and clinical assessment of therapeutically relevant unbound, free, brain concentrations, the pharmacokinetic parameter fraction of unbound drug in brain (fu,brain) is commonly used to compensate total drug concentrations for nonspecific brain tissue binding (BTB). As, homogenous BTB is assumed between species and in health and disease, rat BTB is routinely used. The impact of Alzheimer's disease (AD) on drug BTB in brain regions of interest (ROI), i.e., fu,brain,ROI, is yet unclear. This study for the first time provides insight into regional drug BTB and the validity of employing rat fu,brain,ROI as a surrogate of human BTB, by investigating five marketed drugs in post-mortem tissue from AD patients (n = 6) and age-matched controls (n = 6). Heterogeneous drug BTB was observed in all within group comparisons independent of disease and species. The findings oppose the assumption of uniform BTB, highlighting the need of case-by-case evaluation of fu,brain,ROI in translational CNS research.
Keyphrases
- resting state
- white matter
- functional connectivity
- end stage renal disease
- cerebral ischemia
- chronic kidney disease
- healthcare
- multiple sclerosis
- public health
- adverse drug
- risk assessment
- drug induced
- prognostic factors
- emergency department
- mesenchymal stem cells
- social media
- peritoneal dialysis
- cell therapy
- health information
- binding protein
- electronic health record