Ethanol-nicotine interactions in long-sleep and short-sleep mice.
The possibility that common genetic factors regulate initial sensitivities to ethanol and nicotine as well as the development of cross-tolerance between these agents was explored using the long-sleep (LS) and short-sleep (SS) mice. The LS mice proved to be more sensitive to an acute challenge with nicotine than were the SS mice. Segregation analysis (F1, F2, backcross) indicated that ethanol sensitivity and nicotine sensitivity segregate together. Acute pretreatment with nicotine did not significantly affect sensitivity to ethanol, but ethanol pretreatment altered nicotine responsiveness. The LS mice develop more tolerance to nicotine and ethanol than do the SS and they also develop more cross-tolerance. These genetically determined differences in initial sensitivities, and tolerance and cross-tolerance development are not readily explained by differences in brain nicotinic receptor numbers.
de Fiebre
C M
CM
Institute for Behavioral Genetics, School of Pharmacy, University of Colorado, Boulder 80309.
Marks
M J
MJ
Collins
A C
AC
D000818:Animals; D001831:Body Temperature / Q000187:drug effects; D001923:Brain Chemistry / Q000187:drug effects; D004347:Drug Interactions; D004361:Drug Tolerance; D000431:Ethanol / Q000494:pharmacology*; D005260:Female; D007457:Iodine Radioisotopes; D008297:Male; D051379:Mice; D009538:Nicotine / Q000494:pharmacology*; D012640:Seizures / Q000139:chemically induced / Q000503:physiopathology; D012890:Sleep / Q000187:drug effects* / Q000502:physiology; D013045:Species Specificity
D007457:Iodine Radioisotopes; D000431:Ethanol; D009538:Nicotine