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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Gene expression of heme oxygenase-1 during glial activation by lipopolysaccharide.

The effect of bacterial lipopolysaccharide (LPS) on the expression of mRNA encoding heme oxygenase-1 (HO-1), which is the rate limiting enzyme in heme catabolism and is also known as heat shock protein 32 (HSP32), was examined in primarily cultured rat glial cells. Treatment of cells with LPS elicited an increase in HO-1 mRNA, accompanying down regulation of delta-aminolevulinate synthase, in a dose-dependent fashion. HO-1 mRNA increased markedly at 12 h after LPS treatment (10 microg/ml) and reached a maximum at 24 h. In contrast, HSP70, a major heat shock protein, slightly increased only at 6 h after LPS treatment and returned to the control level by 12 h. These results suggest that HSPs are induced under separate regulation during glial activation by LPS through oxidative stress, a part of which is likely mediated by intracellular free heme.[1]


  1. Gene expression of heme oxygenase-1 during glial activation by lipopolysaccharide. Tsukiji, T., Takahashi, T., Mizobuchi, S., Suzuki, T., Hirakawa, M., Watanabe, S., Akagi, R. Res. Commun. Mol. Pathol. Pharmacol. (2000) [Pubmed]
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