RT Journal Article
SR Electronic
T1 Effects of chronic dietary lithium on behavioral indices of dopamine denervation supersensitivity in the rat.
JF Journal of Pharmacology and Experimental Therapeutics
JO J Pharmacol Exp Ther
FD American Society for Pharmacology and Experimental Therapeutics
SP 324
OP 329
VO 235
IS 2
A1 N R Swerdlow
A1 D Lee
A1 G F Koob
A1 F J Vaccarino
YR 1985
UL http://jpet.aspetjournals.org/content/235/2/324.abstract
AB The present study was designed to test the hypothesis that chronic lithium (Li) treatment could alter the behavioral manifestations of dopamine (DA) denervation supersensitivity. Rats were maintained on a Li diet continuously for 4 weeks before and 4 weeks after bilateral chemical denervation of DA terminal fields in the nucleus accumbens (N.Acc.) and the caudate nucleus (CN). We examined the behavioral responses of these animals to apomorphine (0.1 mg/kg s.c.) treatment 2 and 4 weeks postdenervation. Animals exposed to similar chemical denervation but maintained on a control diet exhibited well-documented "supersensitive" behavioral responses to apomorphine: N.Acc. denervated animals demonstrated increases in ambulatory sniffing, rearing and locomotor activity; CN-denervated animals demonstrated increases in rearing and focused sniffing in one location but no increases in locomotor activity. Compared to these control-fed animals, Li-diet animals receiving either CN- or N.Acc-denervation demonstrated a significantly decreased "supersensitive" behavioral response to apomorphine. N.Acc.-denervated animals receiving Li showed less apomorphine-induced locomotor activity. CN-denervated animals receiving Li showed less focused behavior which became evident as actual increases in locomotor activity after apomorphine. These results suggest that chronic dietary Li modifies postsynaptic mechanisms to suppress elements of the behavioral manifestations of supersensitive mesolimbic and nigrostriatal DA activity.