Differences in the duration of sedative and anxiolytic effects of desmethyldiazepam in two outbred Wistar strains.
Different sensitivities to benzodiazepines have been described for various strains of both rats and mice suggesting that variations in biological features of the animals are responsible for these differences. Since all reports concern inbred strains, we studied two outbred Wistar strains which are used routinely in several research disciplines. The pharmacodynamics of desmethyldiazepam (DMD), the main active metabolite of diazepam in man, were compared for male rats of the Riv:TOX strain (from the National Institute of Public Health and Environmental Protection) and the Crl:(WI)BR strain. The duration of sedative action of DMD after oral administration, as derived from suppression of the nocturnal locomotor activity, was longer in the Riv:TOX strain than in the Crl:(WI)BR strain. Accordingly, suppression of novelty-induced corticosterone release as an index of anxiolytic action was observed 11 hours after DMD administration in Riv:TOX rats but not in Crl:(WI)BR rats. At that time, serum DMD concentration was shown to be higher in the Riv:TOX strain than in the Crl:(WI)BR strain. The data are discussed in relation with possible metabolic differences between the two strains.
van der Laan
J W
JW
Section on Psychopharmacology, National Institute of Public Health and Environmental Protection, Bilthoven, The Netherlands.
de Boer
S F
SF
van der Gugten
J
J
de Groot
G
G
D000818:Animals; D014151:Anti-Anxiety Agents; D003345:Corticosterone / Q000097:blood; D004435:Eating / Q000187:drug effects; D006993:Hypnotics and Sedatives; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D003708:Nordazepam / Q000097:blood / Q000494:pharmacology*; D011869:Radioligand Assay; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity; D013315:Stress, Psychological / Q000097:blood; D013997:Time Factors
D014151:Anti-Anxiety Agents; D006993:Hypnotics and Sedatives; D003708:Nordazepam; D003345:Corticosterone