Abstract
AbstractWe identified antibacterial components in human T and natural killer (NK) cells by using freshly isolated lymphocytes enriched for T and NK cells as starting material. After growing these lymphocytes for 5 days in the presence of interleukin (IL)–2, we isolated and characterized several antibacterial peptides/proteins from the supernatant—α-defensins (HNP 1-3), LL-37, lysozyme, and a fragment of histone H2B—although other active components were also present. We then used reverse transcriptase–polymerase chain reaction to search for expression of the gene coding for LL-37 in several B-cell lines, γδ T-cell lines, NK clones, and one monocytic cell line, with positive results, but found no expression in several αβ T-cell lines. The α-defensins (HNP 1-3) were also found to be expressed in several of these cell lines. To confirm the presence of these antibacterial peptides in lymphocytes, we localized them to NK, γδ T cells, B cells, and monocytes/macrophages by using double-staining immunohistochemical analysis of freshly isolated lymphocytes. We also found that primary cultures of lymphocytes transcribe and secrete LL-37 and that these processes are affected by IL-6 and interferon-γ. In addition, we demonstrated that LL-37 has chemotactic activity for polymorphonuclear leukocytes and CD4 T lymphocytes, whereas others have shown chemotactic activity for human α-defensins (HNP 1-2). These findings suggest that microbicidal peptides are effector molecules of lymphocytes and that antibacterial activity previously shown to be derived from T and NK cells may be partly mediated by the antibacterial peptides LL-37 and HNP 1-3.
Bibliography
Agerberth, B., Charo, J., Werr, J., Olsson, B., Idali, F., Lindbom, L., Kiessling, R., JoÌrnvall, H., Wigzell, H., & Gudmundsson, G. H. (2000). The human antimicrobial and chemotactic peptides LL-37 and α-defensins are expressed by specific lymphocyte and monocyte populations. Blood, 96(9), 3086â3093.
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Dates
Type | When |
---|---|
Created | 5 years, 10 months ago (Oct. 14, 2019, 12:44 a.m.) |
Deposited | 1 year, 11 months ago (Sept. 21, 2023, 12:06 p.m.) |
Indexed | 5 days, 17 hours ago (Aug. 31, 2025, 6:32 a.m.) |
Issued | 24 years, 10 months ago (Nov. 1, 2000) |
Published | 24 years, 10 months ago (Nov. 1, 2000) |
Published Print | 24 years, 10 months ago (Nov. 1, 2000) |
@article{Agerberth_2000, title={The human antimicrobial and chemotactic peptides LL-37 and α-defensins are expressed by specific lymphocyte and monocyte populations}, volume={96}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood.v96.9.3086}, DOI={10.1182/blood.v96.9.3086}, number={9}, journal={Blood}, publisher={American Society of Hematology}, author={Agerberth, Birgitta and Charo, Jehad and Werr, Joachim and Olsson, Berit and Idali, Farah and Lindbom, Lennart and Kiessling, Rolf and Jörnvall, Hans and Wigzell, Hans and Gudmundsson, Gudmundur H.}, year={2000}, month=nov, pages={3086–3093} }