Linked Life Data

7627960

Source:http://linkedlifedata.com/resource/pubmed/id/7627960

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
16
pubmed:dateCreated
1995-9-7
pubmed:abstractText
Human polymorphic N-acetyltransferase (NAT2) catalyzes the N-acetylation of arylamine carcinogens and the metabolic activation of N-hydroxyarylamine and N-hydroxyarylamide carcinogens by O- and N,O-acetylation, respectively. Rapid and slow acetylator phenotype is regulated at the NAT2 locus, and each has been associated with differential risk to certain cancers relating to carcinogenic arylamine exposures. We examined arylamine N-acetylation, N-hydroxyarylamine O-acetylation, and N-hydroxyarylamide N,O-acetylation catalytic activities of 16 different recombinant human NAT2 alleles expressed in an Escherichia coli JM105 expression system. NAT2 alleles contained nucleic acid substitutions at G191A (Arg64-->Gln), C282T (silent), T341C (Ile114-->Thr), C481T (silent), G590A (Arg197-->Gln), A803G (Lys268-->Arg), G857A (Gly286-->Glu), and various combinations of substitutions in the 870-bp NAT2-coding region. Expression of each NAT2 allele produced equivalent amounts of immunoreactive recombinant NAT2 protein with differential levels of N-, O-, and N,O-acetylation activity. Catalytic activities of each of the recombinant human NAT2 allozymes followed the relative order N-acetylation > O-acetylation > N,O-acetylation. Catalytic activation rates for the metabolic activation of N-hydroxy-2-aminofluorene and N-hydroxy-4-aminobiphenyl by O-acetylation and N-hydroxy-2-acetylaminofluorene by N,O-acetylation showed very strong correlations to the N-acetylation of 2-aminofluorene. NAT2 alleles with nucleic acid substitution T341C (NAT2*5A,*5B,*5C) expressed recombinant NAT2 allozymes, with the greatest reductions in metabolic activation of N-hydroxyarylamines and N-hydroxyarylamides by O- and N,O-acetylation, respectively. NAT2 alleles with nucleic acid substitutions G191A (NAT2*14A,*14B) and G590A (NAT2*6A,*6B) expressed recombinant NAT2 allozymes with more moderate reductions. NAT2 alleles with nucleic acid substitution G857A (NAT2*7A,*7B) expressed recombinant NAT2 allozymes with the smallest but yet significant reductions. NAT2 alleles with nucleic acid substitutions C282T (silent), C481T (silent), and A803G (Lys268-->Arg) expressed recombinant NAT2 allozymes that did not have significant reductions in the metabolic activations of N-hydroxyarylamines and N-hydroxyarylamides. The differential capacity for the metabolic activation of N-hydroxyarylamines and N-hydroxyarylamides by recombinant human NAT2 allozymes encoded by polymorphic NAT2 alleles supports the hypothesis that acetylator phenotype may predispose to cancers related to activation of N-hydroxy-arylamine and N-hydroxyarylamide carcinogens.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
55
pubmed:geneSymbol
NAT2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3531-6
pubmed:dateRevised
2010-9-8
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Metabolic activation of N-hydroxyarylamines and N-hydroxyarylamides by 16 recombinant human NAT2 allozymes: effects of 7 specific NAT2 nucleic acid substitutions.
pubmed:affiliation
Department of Pharmacology and Toxicology, University of North Dakota School of Medicine, Grand Forks 58202-9037, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.