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Spatial segregation of neuronal calcium signals encodes different forms of LTP in rat hippocampus
Author(s) -
Raymond Clarke R.,
Redman Stephen J.
Publication year - 2006
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2005.098947
Subject(s) - long term potentiation , calcium , neuroscience , ryanodine receptor , nmda receptor , chemistry , hippocampus , calcium imaging , ltp induction , receptor , biology , biochemistry , organic chemistry
Calcium regulates numerous processes in the brain. How one signal can coordinate so many diverse actions, even within the same neurone, is the subject of intense investigation. Here we have used two‐photon calcium imaging to determine the mechanism that enables calcium to selectively and appropriately induce different forms of long‐term potentiation (LTP) in rat hippocampus. Short‐lasting LTP (LTP 1) required activation of ryanodine receptors (RyRs), which selectively increased calcium in synaptic spines. LTP of intermediate duration (LTP 2) was dependent on activation of inositol 1,4,5‐trisphosphate (IP 3 ) receptors (IP 3 Rs) and subsequent calcium release specifically in dendrites. Long‐lasting LTP (LTP 3) was selectively dependent on L‐type voltage‐dependent calcium channels (L‐VDCCs), which generated somatic calcium influx. Activation of NMDA receptors was necessary, but not sufficient, for the generation of appropriate calcium signals in spines and dendrites, and the induction of LTP 1 and LTP 2. These results suggest that the selective induction of different forms of LTP is achieved via spatial segregation of functionally distinct calcium signals.