LL-37

LL-37, a 37-amino acid peptide, is derived from the C-terminus of human cathelicidin antimicrobial protein 18 (hCAP18) through proteolytic cleavage. Its molecular structure features an amphipathic alpha-helical conformation, which is crucial for its membrane-disrupting capabilities. This peptide is characterized by a net positive charge and a significant hydrophobic face, facilitating its interaction with negatively charged bacterial membranes. Research into LL-37 began with its identification as a potent antimicrobial agent, demonstrating activity against a wide range of bacteria, fungi, and some viruses. Beyond its direct antimicrobial effects, LL-37 has been observed to modulate immune responses, influencing processes such as chemotaxis, angiogenesis, and wound healing in in vitro and ex vivo studies. Its multifaceted biological activities make it a subject of considerable interest in immunology and microbiology research. Investigations into LL-37 often focus on its mechanisms of action, which include membrane permeabilization, inhibition of bacterial cell wall synthesis, and neutralization of bacterial endotoxins. Furthermore, its role in host defense and its potential as a template for novel antimicrobial strategies are actively explored in academic and laboratory settings. The peptide's interaction with host cells and its signaling pathways are also areas of ongoing research.