COMPARATIVE SYNCHRONOUS FLUORESCENCE SPECTROPHOTOMETRY AND P-32 POSTLABELING ANALYSIS OF PAH-DNA ADDUCTS IN HUMAN LUNG AND THE RELATIONSHIPTO TP53 MUTATIONS
A. Andreassen et al., COMPARATIVE SYNCHRONOUS FLUORESCENCE SPECTROPHOTOMETRY AND P-32 POSTLABELING ANALYSIS OF PAH-DNA ADDUCTS IN HUMAN LUNG AND THE RELATIONSHIPTO TP53 MUTATIONS, Mutation research. Genetic toxicology testing, 368(3-4), 1996, pp. 275-282
Polycyclic aromatic hydrocarbon (PAH)-DNA adducts were studied in huma
n lung from 39 lung cancer patients by synchronous fluorescence spectr
ophotometric (SFS) and P-32-postlabelling assays. Regression analysis
of the samples failed to detect any correlation between benzo[a]pyrene
-diolepoxide (BPDE)-DNA adducts detected by SFS and the BPDE co-migrat
ing spot detected by P-32-postlabelling. We have also analyzed the rel
ationship between adduct levels and TP53 mutations. By postlabelling d
iagonal radioactive zone (DRZ) adducts were detected in 37 of 39 (95%)
lung tissues from lung cancer patients and the adduct level ranged fr
om 6.81 to 108.50 adducts/10(8) nucleotide, Thirty-three of 39 (85%) h
ad detectable levels of BPDE-DNA adducts (>1 adduct/10(9) nucleotide).
Current heavy smokers (>20 cigarettes/day) have significantly higher
DRZ adduct levels compared to individuals smoking less than 20 cigaret
tes/day. By SFS combined with immunoaffinity column (IAC), 11 of 39 (2
8%) samples had detectable adduct levels, and 6 of 11 (55%) were detec
table by SFS following purification of benzo[a]pyrene (BP)-tetrols by
high pressure liquid chromatography (HPLC), Six of 33 (18%) samples we
re positive for BPDE-DNA adducts by both postlabelling and HPLC/SFS, N
o correlation was observed between the SFS and P-32-postlabelling assa
ys for the detection of BPDE-DNA adducts, However, there was a good co
rrelation between adduct levels detected by IAC/SFS and HPLC/SFS, We f
ound a weak association between total PAH-DNA adduct levels in lung ti
ssue and TP53 mutations.