Interleukin-10, interleukin-4, and transforming growth factor-β differentially regulate lipopolysaccharide-induced production of pro-inflammatory cytokines and nitric oxide in co-cultures of rat astroglial and microglial cells
✍ Scribed by Annemarie Ledeboer; John J.P. Brevé; Stephen Poole; Fred J.H. Tilders; Anne-Marie Van Dam
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 149 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0894-1491
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✦ Synopsis
The pro-inflammatory cytokines interleukin-1 (IL-1), IL-6, tumor necrosis factor-␣ (TNF-␣), and nitric oxide (NO) can be produced by activated glial cells and play a critical role in various neurological diseases. Using primary co-cultures of rat microglial and astroglial cells, we investigated the effects of the anti-inflammatory cytokines transforming growth factor-1 (TGF-1)/2, IL-4, and IL-10 on the production of (pro-) inflammatory mediators after stimulation of the cells with lipopolysaccharide (LPS; 0.1 g/ml, 24 h). IL-10 (10 and 100 ng/ml) and IL-4 (5 and 50 U/ml) suppressed the LPS-induced production of NO, IL-6, and TNF-␣ in a dose-dependent manner, whereas TGF-1/2 (2 and 20 ng/ml) only suppressed NO production. LPS-induced levels of IL-1 were suppressed by IL-10, but not by IL-4 and TGF-1/2. Conversely, co-incubation of the glial cells with LPS and antibodies to TGF-1/2 selectively enhanced LPS-induced NO production, whereas co-incubation with antibody to IL-10 enhanced LPS-induced production of all pro-inflammatory cytokines and NO. This finding strongly suggests that effective concentrations of TGF-1/2 and IL-10 are produced by LPS-stimulated glial cell co-cultures. Production of IL-10 in these co-cultures was confirmed by measurement of rat IL-10 by radioimmunoassay. We conclude that anti-inflammatory cytokines affect the production of inflammatory mediators in LPS-activated co-cultures of microglial and astroglial cells differentially.