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The Journal of Neuroscience, July 16, 2003, 23(15):6188-6199
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Dual Modes of Endoplasmic Reticulum-to-Golgi Transport in Dendrites Revealed by Live-Cell Imaging
April C. Horton1 andMichael D. Ehlers1,2,3 Departments of 1Neurobiology, 2Cell Biology, and 3Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710
Organelles of the neuronal secretory pathway are critical for the addition of membrane that accompanies neuronal development, as well as for the proper localization of plasma membrane proteins necessary for polarity, synaptic transmission, and plasticity. Here, we demonstrate that two organizations of the secretory pathway exist in neurons: one requiring processing of membrane and lipids in the Golgi complex of the cell body and one in which endoplasmic reticulum (ER)-to-Golgi trafficking is localized to dendrites. Using time-lapse imaging of green fluorescent protein-tagged cargo proteins and compartment markers, we show that organelles of the secretory pathway, including ER, ER exit sites, and Golgi, are present and engage in trafficking in neuronal dendrites. We find that ER-to-Golgi trafficking involves highly mobile vesicular carriers that traffic in both the anterograde and retrograde directions throughout the dendritic arbor. Dendritic Golgi outposts, which appear developmentally during the phase of process outgrowth, are involved in the trafficking of both integral membrane proteins and the secreted neuronal growth factor BDNF. This distributed dendritic Golgi represents an organization of the secretory pathway unique among mammalian cells.
Key words: secretory pathway; protein trafficking; dendrite; local protein synthesis; Golgi; ER exit sites
Received Jan. 10, 2003; revised May. 9, 2003; accepted May. 9, 2003.
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