Study summary · research use only
The LL-37 domain: A clue to cathelicidin immunomodulatory response?
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This review (a literature review, not a specific trial; discusses cathelicidins across mammals, fish, birds, amphibians, and reptiles) discusses host defense peptides, focusing on cathelicidins and their variable C-terminal domains and conserved N-terminal cathelin-like region. The authors describe the role of the LL-37 domain and its SK-24, IV-20, FK-13, and LL-37 fragments in immune responses, noting that the molecular basis of how cathelicidins induce immune responses remains unclear. The review states that other cathelicidins share structural and functional characteristics with the LL-37 domain, suggesting these fragments may mediate interactions between these peptides and receptors in humans, and that studying LL-37 domain fragments may give clues to how homologous cathelicidins generally induce immune responses.
Abstract
Host defense peptides (HDPs) are naturally occurring polypeptide sequences that, in addition to being active against bacteria, fungi, viruses, and other parasites, may stimulate immunomodulatory responses. Cathelicidins, a family of HDPs, are produced by diverse animal species, such as mammals, fish, birds, amphibians, and reptiles, to protect them against pathogen infections. These peptides have variable C-terminal domains responsible for their antimicrobial and immunomodulatory activities and a highly conserved N-terminal pre-pro region homologous to cathelin. Although cathelicidins are the major components of innate immunity, the molecular basis by which they induce an immune response is still unclear. In this review, we will address the role of the LL-37 domain and its SK-24, IV-20, FK-13 and LL-37 fragments in the immunity response. Other cathelicidins also share structural and functional characteristics with the LL-37 domain, suggesting that these fragments may be responsible for interaction between these peptides and receptors in humans. Fragments of the LL-37 domain can give us clues about how homologous cathelicidins, in general, induce an immune response.
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