Linked Life Data

1443165

Source:http://linkedlifedata.com/resource/pubmed/id/1443165

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5 Pt 1
pubmed:dateCreated
1992-12-23
pubmed:abstractText
Previous in vivo studies of sugar transport across the mature pulmonary epithelium have provided evidence for the existence of a specific phlorizin-inhibitable, sodium-dependent transport process for D-glucose, although no direct evidence for the cellular location of this transport system in fresh cells has been shown to date. With the use of elastase digestion and lectin agglutination, a pure preparation of type II alveolar epithelial cells was isolated from adult guinea pig lung. This preparation always contained >90% type II cells and typically showed approximately 85% cell viability 2-3 h after the isolation procedure had begun. At 37 degrees C, cells showed specific [3H]phlorizin binding that was attenuated by D-glucose and completely abolished by sodium replacement. Substantial accumulation of the hexose [14C]methyl alpha-D-glucopyranoside (14C-labeled AMG), a substrate specific for the sodium-dependent glucose cotransporter was found in the presence of extracellular sodium; this accumulation above equilibrium was abolished on removal of sodium, addition of phlorizin, or in the presence of a saturating concentration (69 mM) of D-glucose. The apparent inhibition constant (Ki) for glucose inhibition of AMG uptake was 0.4 mM and for phlorizin, 0.5 microM. The Hill plot of sodium activation of AMG uptake gave a coefficient of 2.8, suggesting cooperativeness between sodium and AMG transport. 3-O-[14C]methyl-D-glucose (3-OMG) transport was also blocked by phlorizin. Phloretin, in the presence of phlorizin, slowed the initial rate of entry but did not affect the equilibrium that was attained in the presence of phlorizin alone.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
263
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
L612-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Pathways for glucose transport in type II pneumocytes freshly isolated from adult guinea pig lung.
pubmed:affiliation
Department of Human Anatomy, Oxford University, United Kingdom.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't