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. 1991 Dec;10(12):3589–3601. doi: 10.1002/j.1460-2075.1991.tb04925.x

Newly synthesized synaptophysin is transported to synaptic-like microvesicles via constitutive secretory vesicles and the plasma membrane.

A Régnier-Vigouroux 1, S A Tooze 1, W B Huttner 1
PMCID: PMC453090  PMID: 1935891

Abstract

The biogenesis of synaptic-like microvesicles (SLMVs) in neuroendocrine cells was investigated by studying the traffic of newly synthesized synaptophysin to SLMVs in PC12 cells. Synaptophysin was found to be sulfated, which facilitated the determination of its exit route from the trans-Golgi network (TGN). Virtually all [35S]sulfate-labeled synaptophysin was found to leave the TGN in vesicles which were indistinguishable from constitutive secretory vesicles but distinct from immature secretory granules and SLMVs. [35S]sulfate-labeled synaptophysin was rapidly transported from the TGN to the cell surface, with a t1/2 of approximately 10 min in resting cells. After arrival at the cell surface, [35S]sulfate-labeled synaptophysin cycled for at least 1 h between the plasma membrane and an intracellular compartment likely to be the early endosome. Up to approximately 40% of the [35S]sulfate-labeled synaptophysin eventually (after 3 h and later) reached SLMVs, which could be distinguished from the other post-TGN compartments by their lower buoyant density in a sucrose gradient and their selective inclusion upon permeation chromatography using a controlled-pore glass column. Our results suggest that newly synthesized membrane proteins of SLMVs in neuroendocrine cells, and possibly of small synaptic vesicles in neurons, reach these organelles via the TGN----plasma membrane----early endosome.

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