Abstract:
:It is well known that adherence of monocytes (MO) to extracellular matrix substrates or tissue culture plastic activates these cells and induces the expression of a multitude of genes. Especially, it was described, that MO are primed by cell adhesion to produce higher amounts of some cytokines, e.g. interleukin (IL)-8 and tumor necrosis factor alpha (TNF-alpha). In order to investigate adherence-induced effects upon cytokine production, we seeded MO into tissue cultures and stimulated cells by lipopolysaccharide (LPS) simultaneously or at later time points. An increasing time-lag between cell adhesion and LPS-stimulation led to differential effects upon cytokine production: whereas TNF was upregulated (in accordance with reports by others), granulocyte colony-stimulating factor (G-CSF) was considerably down-regulated. In contrast, G-CSF production did not change, when cells were kept under non-adherent conditions in whole blood. In adherent cultures down-regulation of G-CSF could already be observed after two hours with a maximum after 24 h and was paralleled by a much lower abundance of G-CSF mRNA. Adhesion induced a significant suppression of G-CSF comparable to MO, if mature macrophages derived from MO in vitro were examined. Furthermore, two other cytokines, granulocyte-macrophage (GM)-CSF and IL-6, were also down-regulated following adhesion. In conclusion, activation of mononuclear phagocytes by adhesion can lead to "priming" for the production of some cytokines and at the same time to "silencing" for the production of others.
journal_name
Immunobiologyjournal_title
Immunobiologyauthors
Krause SW,Kreutz M,Andreesen Rdoi
10.1016/s0171-2985(97)80069-1subject
Has Abstractpub_date
1996-01-01 00:00:00pages
522-34issue
5eissn
0171-2985issn
1878-3279pii
S0171-2985(97)80069-1journal_volume
196pub_type
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