TY  - CONF
A1  - Viviani, A.
A1  - Lutz, Werner K.
T1  - Modulation of the in vivo covalent binding of the carcinogen benzo(a)pyrene to rat liver DNA by selective induction of microsomal and nuclear aryl hydrocarbon hydroxylase activity
N2  - The influence of microsomal (mAHH) and nuclear (nAHH) aryl hydrocarbon hydroxylase activity on the covalent binding of t:titiated benzo(a)pyrene to rat liver DNA was evaluated in vivo. Induction ofmAHH was obtained after phenobarbitone treatment (180% of control), which increased DNA binding to 210%, but left the nAHH unchanged. mAHH and nAHH were slightly indilced with dieldrin (130% and 120%), but the binding remairred unchanged. The increasing effect of mAHlt as weil as the possibly decreasing effect of nAHH induction on the binding became obvious when the data of 11 individual rats were used to solve the equation Binding = aX(mAHH) + bX(nAHH) + c. Multiple linear regression analysis resulted in positive values for a and c, a negative value for b, and a multiple correlation coefficient R = 0.82. An influence of other enzymes involved in the metabolism of benzo(a)pyrene cannot be excluded. The Study shows clearly that the binding of a foreign compound to DNA in vivo is not only dependent on microsomal enzyme activities but also on nuclear activities even if the latter are considerably lower than those of mic'rosomes.
KW  - DNA
KW  - Benzo(a)pyrene
KW  - DNA-Binding
KW  - Carcinogen
KW  - Enzyme
KW  - Induction
KW  - Aryl Hydrocarbon Hydroxylase
KW  - Rats
KW  - Phenobarbitone
KW  - Dieldrin
Y1  - 1979
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/6818
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-80132
ER  -