Linked Life Data

16575786

Source:http://linkedlifedata.com/resource/pubmed/id/16575786

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2006-4-10
pubmed:abstractText
The death-associated protein kinase (DAP-kinase) is a cytoskeleton-associated protein crucially involved in the induction of early apoptotic pathways. Aberrant hypermethylation of the DAP-kinase promoter plays a major role in tumorigenesis. We aimed to investigate the inactivation of DAP-kinase and its association with apoptotic cell death in 94 colorectal carcinomas. DAP-kinase promoter hypermethylation and mRNA expression were investigated using methylation-specific PCR and real-time RT-PCR, respectively. The expression of DAP-kinase, Fas, and Fas-ligand (FasL) proteins was studied by immunohistochemistry and immunofluorescence. Apoptosis of tumour cells was investigated using the TUNEL assay. DAP-kinase was expressed in tumour cells and tumour-invading macrophages and was closely associated with high numbers of apoptotic tumour cells. DAP-kinase expression co-localized with FasL overexpression in tumour-associated macrophages, and aberrant promoter hypermethylation was verified in more than 50% of carcinomas. There was a tendency for proximal tumours to show DAP-kinase promoter methylation more frequently (p = 0.07). Promoter methylation resulted in a decrease or loss of DAP-kinase protein expression in tumour cells and tumour-associated macrophages. Simultaneously, a decreased apoptotic count and loss of Fas/FasL expression was observed in tumour cells. Our study is the first to demonstrate DAP-kinase expression in invading tumour-associated macrophages in colorectal cancer. The presence of similar expression levels of DAP-kinase in tumour cells and associated macrophages, and their dependence on the promoter methylation status of the tumour cells, suggests cross talk between these cell types during apoptotic cell death.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-3417
pubmed:author
pubmed:copyrightInfo
Copyright 2006 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
pubmed:issnType
Print
pubmed:volume
209
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
95-105
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:16575786-Aged, pubmed-meshheading:16575786-Apoptosis, pubmed-meshheading:16575786-Apoptosis Regulatory Proteins, pubmed-meshheading:16575786-Calcium-Calmodulin-Dependent Protein Kinases, pubmed-meshheading:16575786-Colorectal Neoplasms, pubmed-meshheading:16575786-DNA Methylation, pubmed-meshheading:16575786-Fas Ligand Protein, pubmed-meshheading:16575786-Female, pubmed-meshheading:16575786-Gene Expression Regulation, Neoplastic, pubmed-meshheading:16575786-Humans, pubmed-meshheading:16575786-In Situ Nick-End Labeling, pubmed-meshheading:16575786-Macrophages, pubmed-meshheading:16575786-Male, pubmed-meshheading:16575786-Membrane Glycoproteins, pubmed-meshheading:16575786-Microsatellite Repeats, pubmed-meshheading:16575786-Middle Aged, pubmed-meshheading:16575786-Neoplasm Staging, pubmed-meshheading:16575786-Polymerase Chain Reaction, pubmed-meshheading:16575786-Promoter Regions, Genetic, pubmed-meshheading:16575786-RNA, Messenger, pubmed-meshheading:16575786-RNA, Neoplasm, pubmed-meshheading:16575786-Reverse Transcriptase Polymerase Chain Reaction, pubmed-meshheading:16575786-Tumor Necrosis Factors
pubmed:year
2006
pubmed:articleTitle
Close localization of DAP-kinase positive tumour-associated macrophages and apoptotic colorectal cancer cells.
pubmed:affiliation
Department of Pathology, Otto-von-Guericke University Magdeburg, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't