Stimulated natural killer cells secrete factors with chemotactic activity, including NAP-1/IL-8, which supports VLA-4- and VLA-5-mediated migration of T lymphocytes - PubMed (original) (raw)
. 1994 Dec;24(12):2957-65.
doi: 10.1002/eji.1830241206.
Affiliations
- PMID: 7805722
- DOI: 10.1002/eji.1830241206
Stimulated natural killer cells secrete factors with chemotactic activity, including NAP-1/IL-8, which supports VLA-4- and VLA-5-mediated migration of T lymphocytes
K Somersalo et al. Eur J Immunol. 1994 Dec.
Abstract
In vivo, natural killer (NK) cells dominate among the early invading cells in allografts and virus-infected tissues, and they are followed later by an influx of T cells. The same sequence of events was seen in our modified Boyden chamber assay. The migration of both CD3+/CD4+ and CD3+/CD8+ cells through fibronectin-coated filters increased after co-culture with NK cells. The migratory response to a soluble factor from NK cells supernatants was predominantly chemotactic rather than chemokinetic. Endogenous NK cells, purified in the presence of human serum albumin, did not induce T cell chemotaxis, but NK cells which were purified in the presence of 10% fetal calf serum (FCS), or which were activated in the absence of FCS with 10(-4) M histamine, with 300 IU/ml interleukin (IL)-2, or with a combination of 10 IU/ml IL-2 and 10 micrograms/ml CD16 monoclonal antibody increased T cell migration by 30-70%. Both the random and chemotactic migration were dependent on fibronectin receptors VLA-4 and VLA-5 on T cells. About 60% of the chemotactic was neutralized by NAP-1/IL-8 polyclonal antibody. Northern blot analysis revealed IL-8 mRNA expression in highly purified, stimulated NK cells; dimeric IL-8 protein secreted by NK cells was detected by immunoblotting, and, in immunofluorescence staining IL-8 was visualized in NK cells. These observations suggest that NK cells, early invaders in the foci of injury, participate in the initiation of a specific immune response by facilitating T cell recruitment.
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