Title : Transcriptional changes in macrophage TNF-alpha expression following dimethylnitrosamine exposure in vivo.

Pub. Date : 1991 Jul-Aug

PMID : 1791140






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1 Transcriptional changes in macrophage TNF-alpha expression following dimethylnitrosamine exposure in vivo. Dimethylnitrosamine tumor necrosis factor Mus musculus
2 Since the production and expression of the macrophage-derived cytokine tumor necrosis factor-alpha (TNF-alpha) is associated with such anti-tumor activity, studies were performed to determine whether changes in TNF-alpha gene transcription and biosynthesis resulted following DMN exposure. Dimethylnitrosamine tumor necrosis factor Mus musculus
3 Since the production and expression of the macrophage-derived cytokine tumor necrosis factor-alpha (TNF-alpha) is associated with such anti-tumor activity, studies were performed to determine whether changes in TNF-alpha gene transcription and biosynthesis resulted following DMN exposure. Dimethylnitrosamine tumor necrosis factor Mus musculus
4 Since the production and expression of the macrophage-derived cytokine tumor necrosis factor-alpha (TNF-alpha) is associated with such anti-tumor activity, studies were performed to determine whether changes in TNF-alpha gene transcription and biosynthesis resulted following DMN exposure. Dimethylnitrosamine tumor necrosis factor Mus musculus
5 Thioglycollate-elicited macrophages obtained from DMN-exposed animals displayed enhanced levels of constitutively expressed TNF-alpha transcripts compared to vehicle controls. Dimethylnitrosamine tumor necrosis factor Mus musculus
6 Northern blot analysis of the time course expression of TNF-alpha following endotoxin (1 microgram/ml) stimulation in vitro showed a significantly greater induction of TNF-alpha transcripts in macrophages from DMN-exposed than control animals, with peak levels detected between 30 and 120 min. Dimethylnitrosamine tumor necrosis factor Mus musculus
7 Northern blot analysis of the time course expression of TNF-alpha following endotoxin (1 microgram/ml) stimulation in vitro showed a significantly greater induction of TNF-alpha transcripts in macrophages from DMN-exposed than control animals, with peak levels detected between 30 and 120 min. Dimethylnitrosamine tumor necrosis factor Mus musculus
8 However, stimulation of macrophages with IFN-gamma did greatly enhance the surface expression of membrane-bound TNF-alpha in cells from the DMN-treated animals. Dimethylnitrosamine tumor necrosis factor Mus musculus
9 In media alone, a five-fold increase in TNF-alpha activity was observed at 6 h in supernatants from macrophage obtained from DMN-exposed animals compared to the vehicle group. Dimethylnitrosamine tumor necrosis factor Mus musculus