Metabolism and DNA binding of benzo(a)pyrene in cultured human bladder and bronchus

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Carcinogenesis (N.Y.); (United States)

DOI:https://doi.org/10.1093/carcin/3.2.195· OSTI ID:7089595

Stoner, G D; Daniel, F B; Schenck, K M; Schut, H A; Goldblatt, P J; Sandwisch, D W

The metabolism of benzo(a)pyrene (BP) was examined in explant cultures of human bladder and bronchus. Three-day cultures were exposed to radiolabeled BP for 24 h, and the metabolism was determined by analysis of the level of binding of reactive metabolites to DNA, and by the release of metabolites into the medium. For a given individual, the DNA binding level and extent of metabolism was usually higher in the bladder than in the bronchus. In specimens obtained from 16 individuals, the average DNA-binding levels for BP-DNA adducts following a 24 h exposure to 1 microM BP were 6.4 +/- 5.0 mumol BP/mol deoxyribonucleotide for the bladder and 3.1 +/- 1.9 mumol BP/mol deoxyribonucleotide for the bronchus. The major BP-DNA adduct in both tissues co-chromatographed with one of the adducts formed by reaction of r-7, t-8-dihydroxy-t-9,10-oxy-7,8,9,10-tetrahydrobenzo(a)pyrene with deoxyguanosine using high-pressure liquid chromatography. In tissues obtained from the same individual, the binding levels of BP metabolites to bladder cell DNA was not strongly correlated to that of bronchial cell DNA (r . 0.55). The medium of both tissues contained small amounts of free, unconjugated metabolites of BP (less than 3% of the total) and large amounts (30-86% of the total) of unidentified, highly polar material. Human bladder appears to be the most active explant tissue yet studied with respect to its ability to activate BP to DNA binding forms. The relevance of this observation to human bladder cancer is, as yet, unknown.

• Research Organization: Department of Pathology, Medical College of Ohio, Toledo
• OSTI ID: 7089595
• Journal Information: Carcinogenesis (N.Y.); (United States), Journal Name: Carcinogenesis (N.Y.); (United States) Vol. 3:2; ISSN CRNGD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
550201 -- Biochemistry-- Tracer Techniques
550501* -- Metabolism-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ADDUCTS
ANIMALS
AROMATICS
BENZOPYRENE
BINDING ENERGY
BLADDER
BODY
BRONCHI
CELL CULTURES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COMPARATIVE EVALUATIONS
CONDENSED AROMATICS
DNA
ENERGY
HYDROCARBONS
ISOTOPE APPLICATIONS
LIQUID COLUMN CHROMATOGRAPHY
MAMMALS
MAN
METABOLISM
METABOLITES
NUCLEIC ACIDS
ORGANIC COMPOUNDS
ORGANS
PRIMATES
QUANTITATIVE CHEMICAL ANALYSIS
RESPIRATORY SYSTEM
SEPARATION PROCESSES
TRACER TECHNIQUES
URINARY TRACT
VERTEBRATES