| Autor: |
Mattern, Taila, Girroleit, Gundolf, Flad, Hans-Dieter, Rietschel, Ernst T., Ulmer, Artur J. |
| Zdroj: |
The Journal of Experimental Medicine; February 1999, Vol. 189 Issue: 4 p693-700, 8p |
| Abstrakt: |
CD34+ hematopoietic stem cells, which circulate in peripheral blood with very low frequency, exert essential accessory function during lipopolysaccharide (LPS)-induced human T lymphocyte activation, resulting in interferon γ production and proliferation. In contrast, stimulation of T cells by “conventional” recall antigens is not controlled by blood stem cells. These conclusions are based on the observation that depletion of CD34+ blood stem cells results in a loss of LPS-induced T cell stimulation as well as reduced expression of CD80 antigen on monocytes. The addition of CD34-enriched blood stem cells resulted in a recovery of reactivity of T cells and monocytes to LPS. Blood stem cells could be replaced by the hematopoietic stem cell line KG-1a. These findings may be of relevance for high risk patients treated with stem cells or stem cell recruiting compounds and for patients suffering from endotoxin-mediated diseases. |
| Databáze: |
Supplemental Index |
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