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Udgivet

Recombinant human growth-regulated oncogene-alpha induces T lymphocyte chemotaxis. A process regulated via IL-8 receptors by IFN-gamma, TNF-alpha, IL-4, IL-10, and IL-13

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Vis graf over relationer

The human cytokine growth-regulated oncogene (GRO)-alpha is a small glycoprotein secreted by monocytes, endothelial cells, glycoprotein secreted by monocytes, endothelial cells, fibroblasts, synovial cells, and some tumor cells such as melanoma cells. It is structurally related to IL-8 and can activate neutrophils, whereas it induces chemotaxis, exocytosis, and a respiratory burst in neutrophils. To date, its functions on T lymphocytes have not been well established. We report here that recombinant human (rh)GRO-alpha is a potent chemoattractant for freshly isolated T lymphocytes, but not for anti-CD3 mAb-activated T lymphocytes. It attracts CD4+ and CD8+ T lymphocyte subsets to an equal extent. The migrating T lymphocytes toward rhGRO-alpha are predominantly CD45RO+ memory CD4+ and CD8+ subsets. The chemotactic migration of T lymphocytes toward rhGRO-alpha is stimulated via the IL-8 receptors on the cells. This process can be augmented by IFN-gamma and TNF-alpha, and inhibited by IL-4, IL-10, and IL-13. In addition, we also document that on T lymphocytes there exist IL-8 receptors that can be up-regulated by IFN-gamma, TNF-alpha, and IL-2. Our results demonstrate that rhGRO-alpha gene encodes for an inflammatory mediator that stimulates the directional migration of T lymphocytes. It may thus be another important mediator in the diseases in which T lymphocytes form the major constituent of the cellular infiltration.

OriginalsprogEngelsk
TidsskriftJournal of immunology (Baltimore, Md. : 1950)
Vol/bind155
Udgave nummer11
Sider (fra-til)5359-68
Antal sider10
ISSN0022-1767
StatusUdgivet - 1 dec. 1995

ID: 45030073