Linked Life Data

2024726

Source:http://linkedlifedata.com/resource/pubmed/id/2024726

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1991-6-4
pubmed:abstractText
The hydrolysis of membrane phosphoinositides is widely recognized as an important signal transduction pathway in brain. One of the products of phosphoinositide hydrolysis, Ins(1,4,5)P3, is thought to participate in signal transduction by mobilizing intracellular calcium and it is now clear that Ins(1,4,5)P3 metabolism is a complicated process that may be highly regulated. In addition to being dephosphorylated by the action of a 5-phosphatase, Ins(1,4,5)P3 can be phosphorylated by a 3-kinase to Ins(1,3,4,5)P4. Although the physiological significance of the higher inositol polyphosphates is not clear, recent evidence suggests that Ins(1,3,4,5)P4 may also have important second messenger function. Since ethanol is known to have potent effects on synaptic transmission, we investigated the in vitro effects of ethanol on [3H]Ins(1,3,4,5)P4 metabolism by rat whole brain homogenates. Ins(1,3,4,5)P4 was rapidly hydrolyzed to Ins(1,3,4)P3, inositol bisphosphates [Ins(3,4)P2 and Ins(1,3)P2], inositol monophosphates [Ins(1)P/Ins(3)P and Ins(4)P], and to inositol by sequential dephosphorylation. No [3H]Ins(1,4,5)P3 was detected. Ethanol (500 mM), significantly accelerated the dephosphorylation of Ins(1,4,5)P3, resulting in a more rapid formation of inositol bisphosphates, monophosphates and inositol. However, intoxicating and sedative-hypnotic concentrations of ethanol (30-100 mM) had no effect upon Ins(1,3,4)P3 dephosphorylation, suggesting that pharmacologically relevant concentrations of ethanol do not directly effect the enzymes involved in the dephosphorylation of Ins(1,3,4,5)P4 to free inositol in brain.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0145-6008
pubmed:author
pubmed:issnType
Print
pubmed:volume
15
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
136-40
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Effects of ethanol on inositol 1,3,4,5-tetrakisphosphate metabolism by rat brain homogenates.
pubmed:affiliation
Department of Pharmacology, University of Florida College of Medicine, Gainesville 32610.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.