Stimulus generalization of 1-(3-trifluoromethylphenyl)piperazine (TFMPP) to propranolol, pindolol, and mesulergine

Pharmacol Biochem Behav. 1988 Jan;29(1):197-9. doi: 10.1016/0091-3057(88)90296-1.

Abstract

Using standard operant procedures with rats trained to discriminate the serotonin (5-HT) agonist 1-(3-trifluoromethylphenyl)piperazine (TFMPP) (0.5 mg/kg) from saline, tests of stimulus generalization and stimulus antagonism were conducted with propranolol, pindolol, and mesulergine. Neither propranolol nor mesulergine antagonized the TFMPP stimulus (pindolol was not evaluated as an antagonist). However, TFMPP-stimulus generalization occurred with all three agents. These results suggest that the TFMPP-stimulus may involve both a 5-HT1B and a 5-HT1C mechanism and further suggest that propranolol, pindolol, and mesulergine may be capable of acting as agonists at certain populations of serotonin receptors.

Publication types

  • Comparative Study

MeSH terms

  • Adrenergic beta-Antagonists / pharmacology*
  • Animals
  • Antiparkinson Agents / pharmacology*
  • Drug Interactions
  • Ergolines / pharmacology*
  • Generalization, Stimulus / drug effects*
  • Male
  • Pindolol / pharmacology
  • Piperazines / pharmacology*
  • Propranolol / pharmacology
  • Rats
  • Rats, Inbred Strains

Substances

  • Adrenergic beta-Antagonists
  • Antiparkinson Agents
  • Ergolines
  • Piperazines
  • 1-(3-trifluoromethylphenyl)piperazine
  • Propranolol
  • Pindolol
  • mesulergine