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Concept
Infliximab
Summary
Infliximab, a chimeric monoclonal antibody, sold under the brand name Remicade among others, is a medication used to treat a number of autoimmune diseases. This includes Crohn's disease, ulcerative colitis, rheumatoid arthritis, ankylosing spondylitis, psoriasis, psoriatic arthritis, and Behçet's disease. It is given by slow injection into a vein, typically at six- to eight-week intervals.
Common side effects include infections, acute infusion reactions, and abdominal pain. Infliximab is a chimeric monoclonal antibody biologic. It seems to work by binding to and neutralizing TNF-α, preventing it from interacting with its receptors on the cell. TNF-α is a chemical messenger (cytokine) and a key part of the autoimmune reaction.
Infliximab was originally developed in mice as a mouse antibody. Because humans have immune reactions to mouse proteins, the mouse common domains were replaced with similar human antibody domains. They are monoclonal antibodies and have identical structures and affinities to the target. Because they are a combination of mouse and human antibody amino acid sequences, they are called a "chimeric monoclonal antibody".
Infliximab was approved for medical use in the United States in 1998, and in the European Union in August 1999. Infliximab biosimilars have been approved in the EU (2013), in Japan (2014), and in the United States (2016, 2017, 2019). It is on the World Health Organization's List of Essential Medicines.
Three phenotypes, or categories of disease, are present in Crohn's disease: stricturing disease (which causes narrowing of the bowel), penetrating disease (which causes fistulae or abnormal connections of the bowel), and inflammatory disease (which primarily causes inflammation).
Infliximab was first used for closure of fistulae in Crohn's disease in 1999. In a 94-patient, phase II clinical trial, the researchers showed Infliximab was effective in closing fistulae between the skin and bowel in 56–68% of patients.
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