Intravenous self-administration of abused solvents and anesthetics in mice.
Volatile organic solvents, fuels and anesthetics are subject to abuse. The aim of the present study was to evaluate i.v. self-administration of several of these chemicals in drug- and experiment-naive mice using a commercially available vehicle, intralipid. Two strains of mice (DBA/2 and Swiss) were allowed to self-administer toluene (0.0017-0.17 micromol/infusion), 1,1,1-trichloroethane (0.006-0.19 micromol/infusion), ethanol (0.32-1.6 micromol/infusion), cyclohexane (0.0017-0.052 micromol/infusion), propofol (0.01-0.53 micromol/infusion) and flurothyl (0.00042-0.072 micromol/infusion) or their vehicles during 30-min tests. During the test, each nose-poke of the master mouse resulted in a 1.88-microl i.v. infusion to the master mouse and a yoked control mouse. When the delivery line was loaded with a reinforcing drug solution, the number of nose-pokes of the master mice significantly exceeded that for yoked control mice. In the present experiments, significant differences in rates of nose-poking were observed between mice receiving response-contingent and response-noncontingent deliveries of ethanol and toluene in both strains of mice and of 1,1,1-trichloroethane in Swiss mice. These data suggest that the reinforcing effects of abused inhalants can be studied using i.v. self-administration procedures.
Blokhina
Elena A
EA
Department of Psychopharmacology, Institute of Pharmacology, Pavlov Medical University, 6/8 Leo Tolstoy Street, St. Petersburg 197089, Russia.
Dravolina
Olga A
OA
Bespalov
Anton Y
AY
Balster
Robert L
RL
Zvartau
Edwin E
EE
D000777:Anesthetics / Q000008:administration & dosage*; D000818:Animals; D004305:Dose-Response Relationship, Drug; D013287:Illicit Drugs / Q000494:pharmacology*; D007275:Injections, Intravenous; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D012055:Reinforcement Schedule; D012646:Self Administration; D012997:Solvents / Q000008:administration & dosage*
D000777:Anesthetics; D013287:Illicit Drugs; D012997:Solvents