Linked Life Data

12086928

Source:http://linkedlifedata.com/resource/pubmed/id/12086928

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2002-6-27
pubmed:abstractText
The molecular mechanisms mediating acute regulation of insulin release by glucose are partially known. The process involves at least two pathways that can be discriminated on basis of their (in)dependence of closure of ATP-sensitive potassium (K+(ATP)) channels. The mechanism of the K+(ATP) channel-independent pathway was proposed to involve cataplerosis, the export of mitochondrial intermediates into the cytosol and in the induction of fatty acid-derived signaling molecules. In the present article, we have explored in fluorescence-activated cell sorter (FACS)-purified rat beta-cells the molecular steps involved in chronic glucose regulation of the insulin secretory response. When compared with culture in 10 mmol/l glucose, 24 h culture in 3 mmol/l glucose shifts the phenotype of the cells into a state with low further secretory responsiveness to glucose, lower rates of glucose oxidation, and lower rates of cataplerosis. Microarray mRNA analysis indicates that this shift can be attributed to differences in expression of genes involved in the K+(ATP) channel-dependent pathway, in cataplerosis and in fatty acid/cholesterol biosynthesis. This response was paralleled by glucose upregulation of the transcription factor sterol regulatory element binding protein 1c (SREBP1c) (ADD1) and downregulation of peroxisome proliferator-activated receptor (PPAR)-alpha and PPAR-beta (PPARdelta). The functional importance of cataplerosis via citrate for glucose-induced insulin release was further supported by the observation that two ATP-citrate lyase inhibitors, radicicol and (-)-hydroxycitrate, block part of glucose-stimulated release in beta-cells. In conclusion, chronic glucose regulation of the glucose-responsive secretory phenotype is associated with coordinated changes in gene expression involved in the K+(ATP) channel-dependent pathway, in cataplerosis via citrate and in acyl CoA/cholesterol biosynthesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0012-1797
pubmed:author
pubmed:issnType
Print
pubmed:volume
51
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2018-24
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:12086928-Animals, pubmed-meshheading:12086928-Cells, Cultured, pubmed-meshheading:12086928-Citrates, pubmed-meshheading:12086928-Cytosol, pubmed-meshheading:12086928-Glucose, pubmed-meshheading:12086928-Homeostasis, pubmed-meshheading:12086928-Insulin, pubmed-meshheading:12086928-Ion Channels, pubmed-meshheading:12086928-Islets of Langerhans, pubmed-meshheading:12086928-Kinetics, pubmed-meshheading:12086928-Liver, pubmed-meshheading:12086928-Membrane Proteins, pubmed-meshheading:12086928-Mitochondria, pubmed-meshheading:12086928-Models, Biological, pubmed-meshheading:12086928-Potassium Channels, pubmed-meshheading:12086928-RNA, Messenger, pubmed-meshheading:12086928-Rats, pubmed-meshheading:12086928-Reverse Transcriptase Polymerase Chain Reaction, pubmed-meshheading:12086928-Signal Transduction, pubmed-meshheading:12086928-Transcription, Genetic
pubmed:year
2002
pubmed:articleTitle
Critical role for cataplerosis via citrate in glucose-regulated insulin release.
pubmed:affiliation
Molecular Pharmacology Unit, Diabetes Research Center, Faculty of Medicine, Vrije Universiteit Brussel, Laarbeeklaan 103, B-1090 Brussels, Belgium.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't