Mouse (As2-/- MLD model, murine ARSA-LV HSPCs) for pivotal GLP; immunodeficient mice for human-cell biodistribution
“The in vivo safety of single IV administration of ARSA LVV-transduced mHSPCs at 1x106 cells/mouse (40-50x106 cells/kg) in irradiated As2-/- mice was evaluated in a pivotal GLP study for up to 12 months post-transplant.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Why that species
As2-/- mouse used as MLD disease model; recapitulates some pathology but milder phenotype than patients
“The applicant has used the As2-/- mouse as a disease model for MLD in children.”
Yes: murine Lin- HSPCs from As2-/- mice transduced with ARSA LVV (plus healthy human HSPCs) used instead of patient cells
“Therefore, lineage negative (Lin-) mHSPCs (derived from the BM of As2-/- mice) and healthy hHSPCs (derived from umbilical cord blood or BM) transduced with ARSA LVV were used for the majority of the nonclinical studies.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗