Mouse (SC and ICV, juvenile) and juvenile monkey (intrathecal); mouse surrogate ASO arm
“The nonclinical package submitted to the NDA included general toxicology studies of up to 26 and 39 weeks' duration in mouse (subcutaneous [SC]) and monkey (intrathecal lumbar [ITL]), respectively, as well as a 13-week ICV toxicity study in mouse;”
Single mismatch to monkey GFAP mRNA gave no knockdown in monkey; mouse surrogate used to probe on-target GFAP reduction
“No meaningful changes in GFAP mRNA levels were observed in brain or spinal cord tissues, likely due to the single mismatch between zilganersen and monkey GFAP mRNA.”
Yes: mouse-specific surrogate ASO (ISIS 713812) dosed ICV in parallel juvenile mouse arm
“A parallel group administered the mouse surrogate ASO (ISIS 713812; 0.1 mg ICV) demonstrated locomotor hypoactivity and reductions in bone mineral content in males;”