Rapid delivery of internalized signaling receptors to the somatodendritic surface by sequence-specific local insertion.
The recycling pathway is a major route for delivering signaling receptors to the somatodendritic plasma membrane. We investigated the cell biological basis for the remarkable selectivity and speed of this process. We focused on the mu-opioid neuropeptide receptor and the beta(2)-adrenergic catecholamine receptor, two seven-transmembrane signaling receptors that traverse the recycling pathway efficiently after ligand-induced endocytosis and localize at steady state throughout the postsynaptic surface. Rapid recycling of each receptor in dissociated neuronal cultures was mediated by a receptor-specific cytoplasmic sorting sequence. Total internal reflection fluorescence microscopy imaging revealed that both sequences drive recycling via discrete vesicular fusion events in the cell body and dendritic shaft. Both sequences promoted recycling via "transient"-type events characterized by nearly immediate lateral spread of receptors after vesicular insertion resembling receptor insertion events observed previously in non-neural cells. The sequences differed in their abilities to produce distinct "persistent"-type events at which inserted receptors lingered for a variable time period before lateral spread. Both types of insertion event generated a uniform distribution of receptors in the somatodendritic plasma membrane when imaged over a 1 min interval, but persistent events uniquely generated a punctate surface distribution over a 10 s interval. These results establish sequence-directed recycling of signaling receptors in CNS neurons and show that this mechanism has the ability to generate receptor-specific patterns of local surface distribution on a timescale overlapping that of rapid physiological signaling.
Yu
Y Joy
YJ
Program in Neuroscience, University of California at San Francisco, San Francisco, California 94158-2140, USA.
Dhavan
Rani
R
Chevalier
Michael W
MW
Yudowski
Guillermo A
GA
von Zastrow
Mark
M
D000818:Animals; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism*; D002478:Cells, Cultured; D003593:Cytoplasm / Q000737:chemistry / Q000378:metabolism*; D003712:Dendrites / Q000737:chemistry / Q000378:metabolism*; D004705:Endocytosis / Q000502:physiology*; D051379:Mice; D009434:Neural Pathways / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D009474:Neurons / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D017434:Protein Structure, Tertiary / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D018343:Receptors, Adrenergic, beta-2 / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D017450:Receptors, Opioid, mu / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D020539:Sequence Analysis, Protein; D015398:Signal Transduction / Q000502:physiology*; D013997:Time Factors
D018343:Receptors, Adrenergic, beta-2; D017450:Receptors, Opioid, mu
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