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This is the first identification of a Ca 2+ -inhibitable casein kinase (CPK) which we have isolated from the 100 000×g supernatant of Paramecium cell homogenates. The 1000-fold enriched CPK activity depends on millimolar Mg 2+ and is inhibited by low concentrations of heparin or by ≥100 μM Ca 2+ . Enzyme activity is stimulated by polylysine or polyarginine with either casein...
Exocytic fusion in neuroendocrine cells does not always result in complete release of the peptide contents from dense core vesicles (DCVs). In this study, we use fluorescence imaging and immunoelectron microscopy to examine the retention, endocytosis and recycling of chromogranin B in DCVs of NGF-treated PC12 cells. Our results indicate that DCVs retained and retrieved an intact core that was available...
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