Local calcium release in dendritic spines required for long-term synaptic depression.


Journal Article

We have used rats and mice with mutations in myosin-Va to evaluate the range and function of IP3-mediated Ca2+ signaling in dendritic spines. In these mutants, the endoplasmic reticulum and its attendant IP3 receptors do not enter the postsynaptic spines of parallel fiber synapses on cerebellar Purkinje cells. Long-term synaptic depression (LTD) is absent at the parallel fiber synapses of the mutants, even though the structure and function of these synapses otherwise appear normal. This loss of LTD is associated with selective changes in IP3-mediated Ca2+ signaling in spines and can be rescued by photolysis of a caged Ca2+ compound. Our results reveal that IP3 must release Ca2+ locally in the dendritic spines to produce LTD and indicate that one function of dendritic spines is to target IP3-mediated Ca2+ release to the proper subcellular domain.

Full Text

Cited Authors

  • Miyata, M; Finch, EA; Khiroug, L; Hashimoto, K; Hayasaka, S; Oda, SI; Inouye, M; Takagishi, Y; Augustine, GJ; Kano, M

Published Date

  • October 2000

Published In

Volume / Issue

  • 28 / 1

Start / End Page

  • 233 - 244

PubMed ID

  • 11086997

Pubmed Central ID

  • 11086997

Electronic International Standard Serial Number (EISSN)

  • 1097-4199

International Standard Serial Number (ISSN)

  • 0896-6273

Digital Object Identifier (DOI)

  • 10.1016/s0896-6273(00)00099-4


  • eng