Linked Life Data

9605759

Source:http://linkedlifedata.com/resource/pubmed/id/9605759

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1998-6-10
pubmed:abstractText
Due to the potential clinical relevance of HLA class I antigen losses in melanoma cells and the scanty information about the molecular mechanisms underlying these defects, we have characterized the cause of the HLA-A2 antigen loss by autologous melanoma cell lines SK-MEL-29.1.22 and SK-MEL-29.1.29. Both cell lines have structural defects of HLA-A2 genes, which cause lack of their transcription. In SK-MEL-29.1.22 cells the 5'-flanking region, exon 1, intron 1, and a region at the 5' end of exon 2 of the HLA-A2 gene are deleted. The breakpoint of the HLA-A2 gene, which is recombined with a DNA fragment of unknown origin, was localized between two GTTCG sequence repeats at position 101 of exon 2. These repeats may provide the sequence basis for misalignment in the process of DNA deletion. In SK-MEL-29.1.29 cells, loss of HLA-A2 antigens, as well as of HLA-B44 and HLA-Cw5 alleles, is caused by the loss of one copy of chromosome 6. Down-regulation of the expressed HLA class I alleles in the two HLA-A2 loss variants and in the parental cells was found to be associated with a low TAP1 expression and a reduced function of peptide transporters. Therefore, multiple defects result in loss or down-regulation of HLA class I alleles in SK-MEL-29.1.22 and SK-MEL-29.1.29 melanoma cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
58
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2149-57
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Molecular analysis of the HLA-A2 antigen loss by melanoma cells SK-MEL-29.1.22 and SK-MEL-29.1.29.
pubmed:affiliation
Department of Microbiology and Immunology, New York Medical College, Valhalla 10595, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.