Abstract
Expression of the integral membrane protein of small synaptic vesicles, synaptophysin, was investigated in the pheochromocytoma cell line PC12 using a quantiative dot immunoassay. Specific synaptophysin contents of the cultures varied with cell density, high levels being observed in densely seeded dishes and/or after some days of subculturing. Northern blot analysis revealed these cell density-related changes in synaptophysin protein contents to result partly from corresponding alterations in mRNA levels. Treatment with nerve growth factor (NGF), but not with various other effectors of intracellular messenger systems, inhibited both synaptophysin and DNA accumulation in the cultures. These data indicate that synaptophysin expression is high in densely proliferating PC12 cells and uncoupled from process formation and neuronotypic differentiation induced by NGF.
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