Which protein is known for its role in immune response and is often elevated during inflammation?

C-reactive protein (CRP) is a key protein in the immune response, particularly during acute inflammation. It is produced by the liver in response to inflammatory cytokines, particularly interleukin-6 (IL-6). When an injury or infection occurs, CRP levels can rise significantly, often within hours, making it a valuable biomarker for detecting inflammation and monitoring the response to treatment.

CRP functions as part of the innate immune system by enhancing the ability of antibodies and phagocytic cells to clear pathogens and damaged cells. It binds to phosphocholine, found on the surface of dead or dying cells and some bacteria, which promotes opsonization (marking for destruction) by immune cells.

The elevation of CRP is a common feature in many conditions, including infections, autoimmune diseases, and chronic inflammatory conditions. This rapid response makes CRP a sensitive, although not specific, marker for inflammation.