The in vivo conditions needed for the induction of nitrogen oxide synthesis by hepatocytes were determined. Hepatocytes obtained from rats injected with killed Corynebacterium parvum spontaneously produced NO2-+NO3- in culture and were found to contain cytosolic enzyme activity for nitrogen oxide synthesis. The enzyme activity required both L-arginine and NADPH, and was not found in hepatocytes obtained from normal rats or rats injected with lipopoly-saccharide (LPS) alone. In contrast, nonparenchymal cells were stimulated to synthesize NO2-+NO3- by LPS. These results show the presence of inducible cytosolic enzyme activity for nitrogen oxide synthesis in hepatocytes, which is distinct from nonparenchymal cell NO- synthesis.
|Number of pages||7|
|Journal||Biochemical and Biophysical Research Communications|
|State||Published - 16 May 1990|