The C-terminal Helix 9 motif in rat cannabinoid receptor type 1 regulates axonal trafficking and surface expression

Alex Fletcher-Jones, Keri Hildick, Ash Evans, Yasuko Nakamura, Kevin Wilkinson, Jeremy Henley

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
158 Downloads (Pure)

Abstract

Cannabinoid type 1 receptor (CB1R) is only stably surface expressed in axons, where it downregulates neurotransmitter release. How this tightly regulated axonal surface polarity is established and maintained is unclear. To address this question, we used time-resolved imaging to determine the trafficking of CB1R from biosynthesis to mature polarised localisation in cultured rat hippocampal neurons. We show that the secretory pathway delivery of CB1R is axonally biased and that surface expressed CB1R is more stable in axons than in dendrites. This dual mechanism is mediated by the CB1R C-terminus and involves the Helix 9 (H9) domain. Removal of the H9 domain increases secretory pathway delivery to dendrites and decreases surface stability. Furthermore, CB1RΔH9 is more sensitive to agonist-induced internalisation and less efficient at downstream signalling than CB1RWT. Together, these results shed new light on how polarity of CB1R is mediated and indicate that the C-terminal H9 domain plays key roles in this process.
Original languageEnglish
Article numbere44252
Number of pages26
JournaleLife
Volume8
DOIs
Publication statusPublished - 30 Apr 2019

Bibliographical note

© 2019, Fletcher-Jones et al.

Keywords

  • axonal polarity
  • cannabinoid receptor type 1
  • neuronal culture
  • neuroscience
  • rat
  • receptor trafficking
  • secretory pathway
  • surface expression

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