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Toxicology of Industrial Compounds

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268 ENDOCRINE TOXICOLOGY OF THE THYROID<br />

Figure 19.8 Investigative tests on H-P-T-L Axis.<br />

pharmaceutical temelastine increase predominantly the clearance <strong>of</strong> free<br />

T 4, though the bile product is not in conjugate form (Poole et al., 1989,<br />

1990). Other compounds such as the food dye FD&C Red No 3 (Capen<br />

and Martin, 1989) are able to lower circulating triiodothyronine (T 3) by<br />

altered deiodination suggesting the further existence <strong>of</strong> alternative<br />

mechanisms. Furthermore, not all chemicals inducing hepatic neoplasia in<br />

rodents cause thyroid neoplasia (McClain, 1989).<br />

We and others have reported that two SK&F histamine antagonists,<br />

temelastine (SK&F 93944) and lupitidine (SK&F 93479) produce ratspecific<br />

thyroid lesions via perturbation <strong>of</strong> the hepatic locus (Atterwill et

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