Super-resolution microscopy reveals functional organization of dopamine transporters into cholesterol and neuronal activity-dependent nanodomains

Nat Commun. 2017 Sep 29;8(1):740. doi: 10.1038/s41467-017-00790-3.

Abstract

Dopamine regulates reward, cognition, and locomotor functions. By mediating rapid reuptake of extracellular dopamine, the dopamine transporter is critical for spatiotemporal control of dopaminergic neurotransmission. Here, we use super-resolution imaging to show that the dopamine transporter is dynamically sequestrated into cholesterol-dependent nanodomains in the plasma membrane of presynaptic varicosities and neuronal projections of dopaminergic neurons. Stochastic optical reconstruction microscopy reveals irregular dopamine transporter nanodomains (∼70 nm mean diameter) that were highly sensitive to cholesterol depletion. Live photoactivated localization microscopy shows a similar dopamine transporter membrane organization in live heterologous cells. In neurons, dual-color dSTORM shows that tyrosine hydroxylase and vesicular monoamine transporter-2 are distinctively localized adjacent to, but not overlapping with, the dopamine transporter nanodomains. The molecular organization of the dopamine transporter in nanodomains is reversibly reduced by short-term activation of NMDA-type ionotropic glutamate receptors, implicating dopamine transporter nanodomain distribution as a potential mechanism to modulate dopaminergic neurotransmission in response to excitatory input.The dopamine transporter (DAT) has a crucial role in the regulation of neurotransmission. Here, the authors use super-resolution imaging to show that DAT clusters into cholesterol-dependent membrane regions that are reversibly regulated by ionotropic glutamate receptors activation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line
  • Cell Membrane / metabolism*
  • Cell Membrane / ultrastructure
  • Cholesterol / metabolism*
  • Dopamine Plasma Membrane Transport Proteins / metabolism*
  • Dopamine Plasma Membrane Transport Proteins / ultrastructure
  • Dopaminergic Neurons / metabolism*
  • Dopaminergic Neurons / ultrastructure
  • Mice
  • Microscopy
  • Neurons / metabolism
  • Neurons / ultrastructure
  • Presynaptic Terminals / metabolism*
  • Presynaptic Terminals / ultrastructure
  • Receptors, Ionotropic Glutamate / metabolism
  • Synaptic Transmission
  • Tyrosine 3-Monooxygenase / metabolism
  • Vesicular Monoamine Transport Proteins / metabolism

Substances

  • Dopamine Plasma Membrane Transport Proteins
  • Receptors, Ionotropic Glutamate
  • Slc18a2 protein, mouse
  • Vesicular Monoamine Transport Proteins
  • Cholesterol
  • Tyrosine 3-Monooxygenase