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The modification of core histone proteins in mouse 10T1/2 cells and human lung epitheloid (A549) cells by B(a)PDE in vivo and in vitro was found to be similar. Only histones H2A and H3 were extensively modified. Also other proteins, possibly A24 protein and the minor histone H1 species seem to be binding relatively high levels of this ultimate carcinogen. Butyrate treatment which causes hyperacetylation of the core histones, did not change the specificity of B(a)PDE binding to core histones, nor did it affect the initial level of DNA modification. The acetylated species of histone H3 were all accessible to B(a)PDE, suggesting that these epsilon-amino-groups of the lysine residues are not the targets of the B(a)PDE. The rate of removal of B(a)P-DNA adducts was not affected by butyrate treatment in either normal human or XP fibroblasts. Furthermore the B(a)P-core histones were not preferentially removed from normal human fibroblast chromatin during a 24 h post-treatment incubation.

Effect of histone acetylation on the formation and removal of B(a)P chromatin adducts