Linked Life Data

8538647

Source:http://linkedlifedata.com/resource/pubmed/id/8538647

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1996-2-7
pubmed:abstractText
SKI-1 is a 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU)-resistant glioma cell line and SK-MG-1 is a BCNU-sensitive glioma cell line. Both cell lines do not express O6-methylguanine-DNA methyl transferase (MGMT) and exhibit comparable levels of 3-methyladenine DNA glycosylase. In order to detect DNA binding proteins involved in alternative DNA repair mechanisms of BCNU damage, we performed Southwestern analysis using a DNA probe damaged with BCNU and nuclear protein extracts from SKI-1 and SK-MG-1 cell lines. Both cell lines express a protein of M(r) 116,000 that is able to bind to BCNU-damaged DNA with higher specificity than to undamaged DNA. This protein was identified as poly(ADP-ribose) polymerase (PARP). Using glioma extracts depleted of PARP or using antibody to block the DNA binding domain of PARP no other protein binding to BCNU-treated probe was observed. Addition of methoxyamine, an inhibitor of DNA strand breaks, led to a significant reduction of PARP binding to BCNU-treated DNA. BCNU treatment of both glioma cell lines led to reduced nicotinamide adenine dinucleotide levels, indicating activation of PARP. Thus, the recognition and binding of PARP to BCNU-induced DNA nicks with concomitant PARP activation may be important processes that are involved in the initial stage of DNA repair of BCNU lesions in glial cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0027-5107
pubmed:author
pubmed:issnType
Print
pubmed:day
2
pubmed:volume
362
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
41-50
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Identification of a 116 kDa protein able to bind 1,3-bis(2-chloroethyl)-1-nitrosourea-damaged DNA as poly(ADP-ribose) polymerase.
pubmed:affiliation
Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Québec, Canada.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.