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Mirikizumab (LY3074828) is a humanized IgG4 monoclonal antibody that targets the p19 subunit of interleukin 23 (IL-23). Mirikizumab binds to human and monkey IL-23 with high affinity, with Kd values of 21 pM and 55 pM, respectively. By inhibiting the binding of IL-23 to IL-23R, Mirikizumab modulates the immune response and holds potential for research in ulcerative colitis and Crohn's disease[1][2].

[1] Jefremow A, et al. Some are More Equal: Targeting IL 12 and 23 in IBD - A Clinical Perspective. Immunotargets Ther. 2020 Nov 26;9:289-297.
[2] Steere B, et al. Generation and Characterization of Mirikizumab, a Humanized Monoclonal Antibody Targeting the p19 Subunit of IL-23. J Pharmacol Exp Ther. 2023 Nov;387(2):180-187. Steere B, Beidler C, Martin A, Bright S, Kikly K, Benschop RJ. Generation and Characterization of Mirikizumab, a Humanized Monoclonal Antibody Targeting the p19 Subunit of IL-23. J Pharmacol Exp Ther. 2023 Nov;387(2):180-187. DOI:10.1124/jpet.122.001512