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Participation of mammalian defensins and cathelicidins in anti-microbial immunity: receptors and activities of human defensins and cathelicidin (LL-37) Yang D; Chertov O; Oppenheim JJJ Leukoc Biol 2001[May]; 69 (5): 691-7Defensins and cathelicidins are the two major families of mammalian anti-microbial proteins. They contribute to host, innate, anti-microbial defense by disrupting the integrity of the bacterial cell membrane. However, several members of the mammalian anti-microbial proteins including defensins and cathelicidins have been shown recently to have chemotactic effects on host cells. Human neutrophil alpha-defensins are chemotactic for resting, naive CD45RA/CD4 T cells, CD8 T cells, and immature dendritic cells. Human beta-defensins are also chemotactic for immature dendritic cells but induce the migration of memory CD45RO/CD4 T cells. In contrast, cathelicidin/LL-37 is chemotactic for neutrophils, monocytes, and T cells but not for dendritic cells. Thus, these anti-microbial peptides have distinct, host-target cell spectra. The chemotactic activities of human beta-defensins and cathelicidin/LL-37 are mediated by human CC chemokine receptor 6 and formyl peptide receptor-like 1, respectively. The capacities of defensins and cathelicidins to mobilize various types of phagocytic leukocytes, immature dendritic cells, and lymphocytes, together with their other effects such as stimulating IL-8 production and mast cell degranulation, provide evidence for their participation in alerting, mobilizing, and amplifying innate and adaptive anti-microbial immunity of the host.|*Antimicrobial Cationic Peptides[MESH]|Animals[MESH]|Anti-Bacterial Agents/*immunology/metabolism[MESH]|Anti-Infective Agents/*immunology/metabolism[MESH]|Carrier Proteins/*immunology/metabolism[MESH]|Cathelicidins[MESH]|Defensins/*immunology/metabolism[MESH]|Humans[MESH]|Mammals[MESH]|Receptors, Formyl Peptide[MESH]|Receptors, Immunologic/metabolism[MESH]|Receptors, Peptide/metabolism[MESH] |
