Linked Life Data

6210288

Source:http://linkedlifedata.com/resource/pubmed/id/6210288

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
24
pubmed:dateCreated
1985-1-25
pubmed:abstractText
Rat liver lysosomes, isolated from metrizamide gradients by the method of Wattiaux et al. (Wattiaux, R., Wattiaux-de Coninck, S., Ronveaux-Dupol, M.F., and Dubois, F. (1978) J. Cell Biol. 78, 349-368) took up from the medium and degraded several marker protein preparations, viz. 125I-asialofetuin, [35S]methionine-labeled hemoglobin, and [3H]leucine-labeled rat liver cytosol proteins. Rates were indistinguishable for all the markers, indicating that uptake was by a nonspecific process analogous to fluid pinocytosis. No effect of added MgATP or K+ was observed. Lysosomal degradation of all the markers was inhibited by 10(-4) M chloroquine. Swainsonine, on the other hand, at 10(-5) M, inhibited the breakdown only of the glycoprotein, 125I-asialofetuin. In the presence of the inhibitors, there was an accumulation of markers in the lysosomes in amount corresponding to the decreased breakdown, indicating that uptake was unaffected. Degradation and inhibition were measured at pH 7.0, 6.0, and 5.0 with both intact lysosomes and with lysosomes disrupted by the addition of 0.2% Triton X-100. Degradation with intact lysosomes was relatively independent of pH. On the other hand, activity with disrupted lysosomes was negligible at pH 7.0 and rose rapidly with decreasing pH. Inhibition by 10(-4) M chloroquine and 10(-5) M swainsonine with intact lysosomes decreased sharply with decreasing pH and did not occur with disrupted lysosomes.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
259
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
15369-72
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
Swainsonine inhibits glycoprotein degradation by isolated rat liver lysosomes.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.