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The expression of the xanthine oxidoreductase gene was studied in various mouse organs and tissues, under basal conditions and on treatment with bacterial lipopolysaccharide. Levels of xanthine oxidoreductase protein and mRNA were compared in order to understand the molecular mechanisms regulating the expression of this enzyme system. The highest amounts of xanthine oxidoreductase and the respective mRNA are observed in the duodenum and jejunum, where the protein is present in an unusual form because of a specific proteolytic cleavage of the primary translation product present in all locations. Under basal conditions, multiple tissue-specific mechanisms of xanthine oxidoreductase regulation are evident. Lipopolysaccharide increases enzyme activity in some, but not all tissues, mainly via modulation of the respective transcript, although translational and post-translational mechanisms are also active. In situ hybridization studies on tissue sections obtained from mice under control conditions or with lipopolysaccharide treatment demonstrate that xanthine oxidoreductase is present in hepatocytes, predominantly in the proximal tubules of the kidney, epithelial layer of the gastrointestinal mucosa, the alveolar compartment of the lung, the pulpar region of the spleen and the vascular component of the heart.

Tissue- and cell-specific expression of mouse xanthine oxidoreductase gene in vivo: regulation by bacterial lipopolysaccharide