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Guselkumab is a recombinant human IgG1 monoclonal antibody against the IL-23p19 subunit. Guselkumab binds to human and cynomolgus monkey IL-23 with K_d values of 3.3 and 1.9 pmol/L, respectively. Guselkumab inhibits production of cytokines lying downstream of the IL-23 signaling pathway and can be used for psoriatic arthritis research.

Guselkumab inhibits IL-23 (0.5 or 1 ng/mL)-mediated production of Th17 cytokines IL17A, IL-17F, and IL-22 in mouse splenocyteswith IC₅₀ ranging 0.016-0.080 nM. And, it inhibits IL-23 (10 or 100 ng/mL)-mediated production of IL-10 in human NKL cells. Guselkumab has no effect on IL-12 (0.1 ng/mL)-mediated production of interferon γ (IFNγ) in NK92MI cells. .
Guselkumab combines with IBI112 blocks IL-23-induced STAT3 phosphorylation, and Guselkumab blocks IL-23-induced STAT3 phosphorylation with an IC₅₀ value of 102.1100±2.0053 nM.
. Guselkumab blocks hIL-23-induced mIL-17 production in a dose-dependent manner, exhibiting an IC₅₀ of 4.9743 ±1.2847 nM. In another experiment, Guselkumab also blocks IL-17F production in cynomolgus monkeys with an IC₅₀ of 16.7950 nM.

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