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Toxicology of Industrial Compounds

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compound is known to pass the liver and to be systemically distributed<br />

throughout the foetal body. Thus the endothelial cell injuries observed in<br />

the course <strong>of</strong> the Segment II study are regarded secondary to the effect <strong>of</strong><br />

peroxisome proliferation and to have arisen as a consequence <strong>of</strong> oxidative<br />

damage which has been demonstrated to occur in various endothelial cell<br />

systems, for example as a result <strong>of</strong> iron-mediated oxygen free radical attack<br />

(Brieland et al., 1992; Barchowsky et al., 1994; Krautschick et al., 1995).<br />

Therefore, the observed foetotoxicity <strong>of</strong> Compound F in rats is regarded as<br />

occurring solely as a consequence <strong>of</strong> and secondary to peroxisome<br />

proliferation, and there is no evidence to assume that this effect as a result<br />

<strong>of</strong> exposure to benzotriazole based light stabilisers may occur in species<br />

that are non-responsive to the action <strong>of</strong> peroxisome proliferators as stated<br />

above, including humans.<br />

References<br />

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<strong>of</strong> forestomach tumors in partially hepatectomized Wistar rats given butylated<br />

hydroxyanisole, Experimental and Molecular Pathology, 44, 14–20.<br />

ANON., 1986, Butylated hydroxyanisole (BHA), IARC Monographs on the<br />

Evaluation <strong>of</strong> the Carcinogenic Risk <strong>of</strong> Chemicals to Man, Vol. 40, pp. 123–<br />

59.<br />

BARCHOWSKY, A., WILLIAMS, M.E., BINZ, C.C. and CHEPENIK, K.P., 1994,<br />

Oxidant-sensitive protein phosphorylation in endothelial cells, Free Radical<br />

Biology and Medicine, 16, 771–7.<br />

BARTER, R.A. and KLAASSEN, C.D., 1992, Rat liver microsomal UDPglucuronosyltransferase<br />

activity toward thyroxin: characterisation, induction<br />

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BENSON, A.M., CHA, Y.-H., BUEDING, E., HEINE, H.S. and TALALAY, P.,<br />

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BENTLEY, P., CALDER, I., ELCOMBE, C., GRASSO, P., STRINGER, D. and<br />

WIEGAND, H.-J., 1993, Hepatic peroxisome proliferation in rodents and its<br />

significance for humans, Food and Chemical <strong>Toxicology</strong>, 31, 857–907.<br />

BRIELAND, J.K., CLARKE, S.J., KARMIOL, S., PHAN, S.H. and FANTONE, J.<br />

C., 1992, Transferrin: a potential source <strong>of</strong> iron for oxygen free radicalmediated<br />

endothelial cell injury, Archives <strong>of</strong> Biochemistry and Biophysics,<br />

294, 265–70.<br />

CHOE, S.Y., KIM, H.M. and YANG, K.H., 1984, Effects <strong>of</strong> butylated<br />

hydroxytoluene (BHT) on biliary excretion <strong>of</strong> xenobiotics and bile flow in<br />

rats, Drug and Chemical <strong>Toxicology</strong>, 7, 149–65.<br />

CONNING, D.M. and PHILLIPS, J.C., 1986, Comparative metabolism <strong>of</strong> BHA,<br />

BHT and other phenolic antioxidants and its toxicological relevance, Food and<br />

Chemical <strong>Toxicology</strong>, 24, 1145–8.

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