Definition

A humanized monoclonal antibody directed against the p19 protein subunit of interleukin-23 (IL-23), with immunomodulating activity. Upon subcutaneous administration, tildrakizumab targets and binds to the p19 subunit of IL-23, thereby neutralizing IL-23 and preventing the binding of IL-23 to its receptor. This inhibits IL-23-mediated signaling and inhibits differentiation of CD4 positive T cells into Th1 and Th17 cells. This prevents Th1- and Th17-mediated responses and cytokine production. This may prevent or reduce symptoms and severity of graft versus host disease (GVHD). IL-23, a pro-inflammatory cytokine that play a key role in the regulation of the immune system, is upregulated in immune-mediated inflammatory disorders. Both Th1 and Th17 cells play a crucial role in GVHD.