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Effects in mice of simultaneous prenatal exposure to ochratoxin A and T-2 toxin.

Aspergillus ochraceus and Fusarium tricinctum are food contaminating molds whose toxic metabolites, ochratoxin A and T-2 toxin, are known mammalian teratogens. In order to determine the possible effects of simultaneous exposure to such environmental agents, ochratoxin A (2 or 4 mg/kg) and T-2 toxin (0.5 mg/kg) were injected ip, either together or individually, in CD-1 mice on gestation days 8 or 10. Ochratoxin induced craniofacial malformations when given alone on day 8, but not on day 10. T-2 toxin induced tail and limb anomalies particularly when given on day 10. When the two toxins were given together on day 10, ochratoxin exacerbated the incidence of T-2 induced gross malformations. An increase in fetocidal effects was also noted in groups treated at the high dose combination on either day, and effects on fetal growth of the high dose combination given on day 10 were greater than those of the other treatments. Few skeletal or visceral malformations were noted. These results indicated that two teratogens with presumably differing mechanisms of teratogenesis may have additive effects when administered concurrently to the same animal. Such results could be due to generalized toxic effects on the fetus or to more specific mechanisms, but further information is needed to differentiate between the two possibilities.