Linked Life Data

1706

Source:http://linkedlifedata.com/resource/pubmed/id/1706

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1976-3-15
pubmed:abstractText
Lung slices from term fetal rats were incubated in vitro at various pH values and the rates of the two de novo pathways for lecithin biosynthesis were determined by measuring the conversion of either 14C-choline (pathway 1) or 14C-methionine (pathway 2) to the phospholipid. It was observed that the choline pathway, but not phosphatidylethanolamine methylation, is pH-sensitive with maximum rates occurring at pH levels between 7.3 and 7.5; significantly less activity was found at pH levels between 7.0 and 7.2 and at pH levels between 7.6 and 8.0. Adjustment of the pH from 7.0 to 7.4 in vitro simulating the clinical correction of acidosis by alkali infusion was found to increase the conversion of choline to lecithin to a rate approximating that observed at pH 7.4. Since lecithins are the principal phospholipid components of pulmonary surfactant, and since pathway 1 is predominantly responsible for lung lecithin synthesis, the demonstration of impaired production with reduced pH offers a biochemical explanation for the pathophysiological effects of acidosis in the respiratory distress syndrome. A comparison of pH effects on choline pathway rate with the pH profiles of pathway enzymes suggests that these effects are mediated by the catalysts of lecithin synthesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0031-4005
pubmed:author
pubmed:issnType
Print
pubmed:volume
57
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
32-40
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1976
pubmed:articleTitle
Diminished pulmonary lecithin synthesis in acidosis: experimental findings as related to the respiratory distress syndrome.
pubmed:publicationType
Journal Article, In Vitro