“Given >99% homology with human APRIL and comparable binding affinity, the cynomolgus monkey was considered a pharmacological relevant species for safety evaluation.”
APRIL binding comparable in cynomolgus monkey, rabbit and human; no binding detected in mouse or rat
“In cross-species comparison studies, binding affinity for APRIL was comparable between cynomolgus monkeys, rabbits, and humans whereas binding to APRIL could not be detected in rodents (mouse or rat).”
No surrogate in toxicology; the clinical antibody was tested in cynomolgus monkeys (mouse surrogate mAb 4540 used in a mouse IgAN efficacy model)
“The impact of blocking APRIL interaction with its receptors was evaluated in a grouped ddY (gddY) IgA mouse nephropathy model using the mAb 4540 mouse surrogate and in healthy cynomolgus monkeys with sibeprenlimab.”