A septin-dependent diffusion barrier at dendritic spine necks

Helge Ewers, Tomoko Tada, Jennifer D. Petersen, Bence Racz, Morgan Sheng, Daniel Choquet

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Excitatory glutamatergic synapses at dendritic spines exchange and modulate their receptor content via lateral membrane diffusion. Several studies have shown that the thin spine neck impedes the access of membrane and solute molecules to the spine head. However, it is unclear whether the spine neck geometry alone restricts access to dendritic spines or if a physical barrier to the diffusion of molecules exists. Here, we investigated whether a complex of septin cytoskeletal GTPases localized at the base of the spine neck regulates diffusion across the spine neck. We found that, during development, a marker of the septin complex, Septin7 (Sept7), becomes localized to the spine neck where it forms a stable structure underneath the plasma membrane. We show that diffusion of receptors and bulk membrane, but not cytoplasmic proteins, is slower in spines bearing Sept7 at their neck. Finally, when Sept7 expression was suppressed by RNA interference, membrane molecules explored larger membrane areas. Our findings indicate that Sept7 regulates membrane protein access to spines.

Original languageEnglish
Article numbere113916
JournalPloS one
Volume9
Issue number12
DOIs
Publication statusPublished - Dec 10 2014

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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    Ewers, H., Tada, T., Petersen, J. D., Racz, B., Sheng, M., & Choquet, D. (2014). A septin-dependent diffusion barrier at dendritic spine necks. PloS one, 9(12), [e113916]. https://doi.org/10.1371/journal.pone.0113916