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Localization of angiotensin-converting enzyme, prolyl endopeptidase and other peptidases in cultured neuronal or glial cells.
To determine the cellular localization of nervous tissue peptidases, 7 peptidases and 2 lysosomal marker enzyme activities were measured in cultured mouse and rat cells. Neuronal cells of both species exhibited higher activities of angiotensin-converting enzyme (ACE) and prolyl endopeptidase (Pro-EP) than glial cells did. In contrast, arginyl endopeptidase and lysosomal enzymes (acid phosphatase, ?-glucuronidase) in the neuronal cell lines were lower than those in the glial cell lines. Other peptidases (alanyl aminopeptidase, arginyl aminopeptidase, leucyl aminopeptidase, dipeptidyl aminopeptidase) activities were not specifically localized in either cell lines. The effects of cellular differentiation on these peptidase activities in the PC 12h cell line and rat glioblasts were also examined using nerve growth factor (NGF) and glia maturation factor (GMF), respectively. Neuron specific peptidase (ACE and Pro-EP) activities were decreased in PC12h cells cultured with NGF, and Pro-EP activity was increased in the glioblast cells cultured with GMF. These results support the idea that some of the peptidases are differentially localized in neuronal or glial cells, and play physiological roles in central or peripheral neural tissues.
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