Mouse (surrogate antibody) for repeat-dose and DART; single-dose chimpanzee study with teplizumab
“As teplizumab was shown to only cross-react with CD3+ T cells from humans, gorillas, chimpanzees, and gibbons, minimal nonclinical investigations were conducted with teplizumab itself.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗
Why that species
Teplizumab binds CD3+ T cells only from humans, gorillas, chimpanzees and gibbons; no rodent activity, so a mouse surrogate was used
“As teplizumab was shown to only cross-react with CD3+ T cells from humans, gorillas, chimpanzees, and gibbons, minimal nonclinical investigations were conducted with teplizumab itself.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗
Surrogate molecule
Yes: anti-mouse CD3 epsilon surrogate mAb with same Fc modifications, used for mouse repeat-dose, fertility, EFD and PPND studies
“evaluation continued in mice with a surrogate antibody in a GLP 6 days repeat dose toxicology (RDT) study, male/female fertility and early embryonic (FEED) studies, embryonic development (EFD) and a pre-postnatal development (PPND) study.”