Linked Life Data

9582515

Source:http://linkedlifedata.com/resource/pubmed/id/9582515

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-5-20
pubmed:abstractText
Glucose infusion into rats has been shown to sensitize/desensitize insulin secretion in response to glucose. In pancreatic islets from glucose-infused rats (GIR) (48 h, 50%, 2 ml/h) basal insulin release (2.8 mmol/l glucose) was more than fourfold compared with islets from saline-infused controls and the concentration-response curve for glucose was shifted to the left with a maximum at 11.1 mmol/l. The concentration-response curve for 45Ca2+ uptake was also shifted to the left in islets from GIR with a maximum at 11.1 mmol/l glucose. Starting from a high basal level at 2.8 mmol/l glucose KCl produced no insulin release or 45Ca2+ uptake in islets from GIR. Islets from GIR exhibited a higher ATP/ADP ratio in the presence of 2.8 mmol/l glucose and marked inhibition of 86Rb+ efflux occurred even at 3 mmol/l glucose. Moreover, in islets from GIR the redox ratios of pyridine nucleotides were increased. On the other hand insulin content was reduced to about 20%. The data suggest that a 48-h glucose infusion sensitizes glucose-induced insulin release in vitro in concentrations below 11.1 mmol/l. This may, at least in part, be due to enhanced glucose metabolism providing increased availability of critical metabolic factors including ATP which, in turn, decrease the threshold for depolarization and therefore calcium uptake. Calcium uptake may then be further augmented by elevation of the redox state of pyridine nucleotides.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-0795
pubmed:author
pubmed:issnType
Print
pubmed:volume
156
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
583-90
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Effect of forty-eight-hour glucose infusion into rats on islet ion fluxes, ATP/ADP ratio and redox ratios of pyridine nucleotides.
pubmed:affiliation
Department of Pharmacology, University of Tübingen, Germany.
pubmed:publicationType
Journal Article