N-Formyl-Met-Leu-Phe-Lys (CAS 104180-18-9)

N-Formyl-Met-Leu-Phe-Lys (fMLFK) is a synthetic peptide derived from the N-terminus of bacterial proteins, particularly those released during infection or inflammation. This chemical has been extensively studied in research settings due to its role as a potent chemoattractant for leukocytes, particularly neutrophils, in the immune response. The mechanism of action of fMLFK involves its interaction with specific cell surface receptors, known as formyl peptide receptors (FPRs), expressed on the surface of leukocytes. Upon binding to FPRs, fMLFK triggers a series of intracellular signaling cascades that result in the activation of leukocytes and their subsequent migration towards sites of infection or tissue damage. In research, fMLFK has been employed as a valuable tool to investigate the mechanisms underlying leukocyte chemotaxis and inflammation. It has been used in various in vitro and in vivo studies to explain the signaling pathways involved in FPR activation, the regulation of leukocyte migration, and the interplay between immune cells and microbial pathogens. Additionally, fMLFK has been utilized in the development and optimization of assays for studying immune cell function, screening potential agents targeting leukocyte recruitment, and evaluating the efficacy of anti-inflammatory drugs.