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Abstract. Thermal balneotherapy with Comano spa's water (CW; Trentino, Italy) is used for psoriasis and other skin disorders but the mechanism(s) of action of this hypotonic water are unknown.

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As revealed by a novel in utero-in vitro hepatocarcinogenesis model, a single exposure to dimethylnitrosamine (DMN) elicited in postnatal (and fetal) primary rat hepatocytes (i) immunocytochemically detectable, widespread increases in their complement of the alpha, mu and especially pi classes of cytosolic glutathione S-transferases (GSTs); and (ii) changed patterns (with respect to controls) of the phenobarbital (PB)-evoked increases in steady state levels of c-jun and c-myc mRNA's. These results indicate that DMN causes both transient cytotoxic effects and a broad, permanent initiation in fetal proliferating hepatocytes.