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

Plasma membrane localization and metabolism of alkaline phosphodiesterase I in mouse peritoneal macrophages.

Alkaline phosphodiesterase I activity is demonstrable in lysates of mouse resident peritoneal macrophages (1.43 mU/mg), endotoxin-stimulated macrophages (1.36 mU/mg), and thioglycollate-stimulated macrophages (3.91 mU/mg), as well as in the lysates of several mouse cell lines. The enzyme showed little variation in culture, although serum deprivation caused a 50% decrease in enzyme activity. In each of the three macrophage types about 80% of the enzyme is inactivated by the diazonium salt of sulfanilic acid, indicating that this enzyme is a component of the plasma membrane. In thioglycollate-stimulated cells about the same fraction of enzyme can be inactivated with papain corroborating this assignment. The enzyme is inactivated with a half-time of 14.1 h in resident cells, but this is decreased to 8.2 h in endotoxin cells, and to 5.7 h in thioglycollate cells. These results are consistent with the hypothesis that the endogenous pinocytic rate is a major determinant of plasma membrane turnover. In addition, the different synthetic rates measured in resident and inflammatory cells support the concept that macrophage activation is a differentiative process leading to a qualitatively new cell type.[1]

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