Linked Life Data

2476402

Source:http://linkedlifedata.com/resource/pubmed/id/2476402

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1989-10-16
pubmed:abstractText
The sialyltransferase activities of 10 human colorectal specimens were compared with those of the corresponding adjacent normal mucosa. Using asialofetuin as an acceptor we found, in tumor tissues of 9 out of 10 patients, an increased sialyltransferase activity towards the N-linked chains as determined upon peptide-N4-(N-acetyl-beta-glucosaminyl)asparagine amidase (PNGase) treatment. On the contrary, the activity towards the O-linked chains was not significantly changed. When the specificity of the sialyltransferase acting on N-linked chains was investigated by using N-acetyl-lactosamine (Gal beta 1,4GlcNAc) as an acceptor, we found that the alpha 2,6 sialyltransferase activity expressed by both normal and tumor colorectal tissues was far higher than the alpha 2,3-activity and that alpha 2,6 was the only sialyltransferase activity increased in tumor tissues. Kinetic analysis revealed that normal and tumor alpha 2,6 sialyltransferases have the same apparent Km for the acceptor substrate (469 and 465 microns), but normal enzyme has a higher Km for CMP-NeuAc (303 microns) than the tumor enzyme (50 microns). The higher affinity of tumor enzyme for the nucleotide-sugar might partially explain its increased activity in tumor tissues. In addition, tumor tissues contain a lower amount of sialic acid despite the increase in alpha 2,6 sialyltransferase activity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0020-7136
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
434-9
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Increased CMP-NeuAc:Gal beta 1,4GlcNAc-R alpha 2,6 sialyltransferase activity in human colorectal cancer tissues.
pubmed:affiliation
Dipartimento di Patologia Sperimentale, Università di Bologna, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't