NCIt definition : Anhydrous from of tacrolimus, a macrolide isolated from Streptomyces tsukubaensis.
Tacrolimus binds to the FKBP-12 protein and forms a complex with calcium-dependent
proteins, thereby inhibiting calcineurin phosphatase activity and resulting in decreased
cytokine production. This agent exhibits potent immunosuppressive activity in vivo
and prevents the activation of T-lymphocytes in response to antigenic or mitogenic
stimulation. Tacrolimus possesses similar immunosuppressive properties to cyclosporine,
but is more potent.;