Linked Life Data

15016804

Source:http://linkedlifedata.com/resource/pubmed/id/15016804

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
2004-5-24
pubmed:abstractText
There are several lines of evidence showing that synaptic activity regulates the level of expression of inositol 1,4,5-trisphosphate receptor type 1 (IP3R1) in neurons. In this study, we examined the effect of chronic activity blockade on the localization and level of IP3R1 expression in cultured hippocampal neurons. We found that chronic blockade of NMDA receptors (NMDARs), one of the major Ca(2+)-permeable ion channels, increased the number of neurons that express a high level of IP3R1 without any apparent changes in its intracellular localization. Interestingly, this up-regulation was time-dependent; there was no clear change in IP3R1 expression level up to day 5 of the NMDAR blockade, but expression increased at day 6, and the increased expression level persisted for at least a week. The up-regulation of IP3R1 depended on transcription and protein synthesis and required cAMP-dependent protein kinase activity. Moreover, although most of the control neurons did not respond to the metabotropic glutamate receptor (mGluR) stimulation, the 2-amino-5-phosphonopentanoic acid-treated neurons with high IP3R1 expression became sensitive to mGluR stimulation. Furthermore, we also found that hippocampal neurons transiently overexpressing green fluorescent protein-tagged IP3R1 released Ca2+ in response to mGluR and muscarinic acetylcholine receptor stimulation. These findings suggested that chronic NMDAR blockade increased the IP3R1 expression and enhanced sensitivity to mGluR stimulation. The change in IP3R1 expression level in response to alteration of synaptic activity may be an important determinant of the sensitivity of Ca2+ stores to G-protein-coupled receptor stimulation and would help to maintain intracellular Ca2+ homeostasis in hippocampal neurons.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
28
pubmed:volume
279
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
23691-8
pubmed:dateRevised
2007-7-18
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Activity-dependent expression of inositol 1,4,5-trisphosphate receptor type 1 in hippocampal neurons.
pubmed:affiliation
Division of Molecular Neurobiology, Institute of Medical Science, University of Tokyo, 4-6-1, Shirokane-dai, Minato-ku, Tokyo 108-8639, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't