Mouse collagen-induced arthritis with surrogate REGN844 (prophylactic); prevented joint inflammation and bone erosion
“Pertinent to the proposed indication of rheumatoid arthritis, the effect of blocking IL-6Rα was evaluated in a murine model of collagen-induced arthritis. In a prophylactic setting, REGN844 prevented development of joint inflammation and bone erosion.”
Sarilumab does not bind murine IL-6Rα; humanized mice or a mouse surrogate were required
“Sarilumab binds human and Cynomolgus monkey IL-6Rα with an equilibrium dissociation constant (Kd) of 54 pM and 123 pM, respectively, but no binding of sarilumab to the murine IL-6Rα was observed.”
✓ VerifiedFDA pharmacology/toxicology review, p. 46Source ↗
Reviewer's view of the efficacy data
EMA: surrogate CIA data provide proof-of-concept for IL-6Rα blockade in arthritis
“Sarilumab murine surrogate was able to mitigate disease signs and severity (swelling of the joints, bone erosion) of induced autoimmune rheumatoid arthritis in CIA model. These data provide a proof-of-concept for the blockade of IL-6Rα in arthritis.”