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Interleukin 1beta Mediates the Effect of High D-glucose on the Secretion of TNF-alpha by Mouse Uterine Epithelial Cells

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Journal Cytokine
Date 1999 Jul 27
PMID 10419651
Citations 9
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Abstract

Previous observations have shown that tumour necrosis factor alpha (TNF-alpha) synthesis is increased in the uterus of diabetic rats and that the epithelial layer lining the uterine lumen is the major site of TNF-alpha over-production. In the present study, TNF-alpha secretion was found to be stimulated by high D-glucose levels in primary cultures of mouse uterine luminal cells but not in cultures of the mouse uterine epithelial WEG-1 cell line. Experiments were performed to investigate the possibility that non-epithelial cells may mediate the influence of high D-glucose on TNF-alpha production by uterine epithelial cells. Immunocytochemical analysis revealed the reproducible presence of a small proportion of macrophages in primary cultures. Macrophages of the RAW 264.7 cell line were found to secrete more interleukin (IL)-1beta (but not TNF-alpha) when cultured in high D-glucose. TNF-alpha production in WEG-1 cells was increased upon exposure to IL-1beta and both protein kinase-C and tyrosine kinase pathways appeared to be involved in TNF-alpha stimulation. Addition of IL-1 receptor antagonist to primary cultures partially abrogated the effect of high D-glucose. Since WEG-1 cells do not produce IL-1beta, the data lend support to the hypothesis that uterine epithelial cells synthesize high levels of TNF-alpha in response to hyperglycaemia via an increase in IL-1beta secretion by stromal macrophages.

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