[Role of serotonin receptors in the delta-opioid immunosuppression].

The present study indicates involvement of serotoninergic (5-HTergic) mechanisms in immunosuppression by DSLET (100 mkg/kg), a selective agonist of the delta2-opioid receptors, in CBA mice. 8-OH-DPAT (0.1 mg/kg), a selective agonist of the 5-HT(1A)-autoreceptors, WAY-100635 (1, 3 mg/kg) and ketanserin (1, 3 mg/kg), a selective antagonists of the postsynaptic 5-HT(1A)- and 5-HT(2A)-receptors, respectively, prevented immunosuppressive effect of DSLET. A possible differential role for 5-HT-receptors in delta-opioid immunosuppression is suggested.