Abstract
Wild cotton rats (Sigmodon hispidus) are ubiquitous throughout the Southeast quadrant of the United States, easy to capture, have a generation interval of less than one year and a limited range of movement (less than one hectare). This species may prove to be an excellent model for monitoring environmental contamination. Traditionally, cytochrome P-450 inducing agents are grouped into two classes. One, represented by phenobarbital, induces P-450b and P-450e; the other, represented by 3-methylcholanthrene, induces P-450c and P-450d isoenzymes. The types and amounts of cytochrome P-450 vary among species, organs, health status, sex, and stress of the animal. If the levels of cytochrome P-450 of wild cotton rats are to be used in monitoring environmental pollution, it is necessary to characterize the inducibility and concentration of cytochrome P-450 in this species. This study was designed to determine the concentration and inducibility of cytochrome P-450 in the livers of cotton rats after intraperitoneal (ip) administration of phenobarbital and 3-methylcholanthrene.
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