Summary
Growth cones of ‘differentiating’ neuroblastoma cells in monolayer culture were studied by time-lapse cinematography and electron microscopy. Morphological differentiation, and thus growth cone formation, was induced by the glucocorticoid dexamethasone. Growth cones lengthened gradually at an average rate of 30 μm/h, advancing in stages that involved alternating extensions and retractions of the filopodia and lamellar sheets. During neurite growth the cell body usually remained stationary. The ultrastructure of growth cones was typified by several filopodia, each containing a bundle of microfilaments, agranular endoplasmic reticulum, aggregates of large agranular vesicles lying adjacent to filopodia (previously termed vesicle-filled mounds), many dense-cored vesicles, 100–140 nm in diameter, microtubules, bizarre and distorted mitochondria, and scattered free ribosomes. Comparing the findings with previous ultrastructural accounts of growth cones of cultured ganglion cells, similarities outnumbered differences. The organization of the microfilament bundles and the abundance of free ribosomes were remarkable in the neuroblastoma cell as was the profusion of dense-cored vesicles which were most numerous in the proximal portion of the growth cone.
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Kataoka, S., Sandquist, D., Williams, L. et al. Growth cones in differentiated neuroblastoma: A time-lapse cinematographic and electron microscopic study. J Neurocytol 9, 591–602 (1980). https://doi.org/10.1007/BF01205027
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DOI: https://doi.org/10.1007/BF01205027