The serotonergic agonists quipazine, CGS-12066A, and alpha-methylserotonin alter motor activity and induce hindlimb stepping in the intact and spinal rat fetus.
The effects of serotonergic agonists were examined in intact and spinal fetuses, using an in vivo fetal rat preparation. On Gestational Day 20, fetuses were prepared with a midthoracic or sham spinal transection. Dose-response curves were obtained for quipazine (nonselective 5-hydroxytryptamine [5-HT] agonist; 1.0-10.0 mg/kg), CGS-12066A (5-HT-sub(1B) agonist; 1.0-30.0 mg/kg), and alpha-methylserotonin (alpha-Me-5-HT; 5-HT-sub-2 agonist; 0.2-15.0 mg/kg). During a 10-min test, each of the agonists (delivered via intraperitoneal injection) influenced fetal behavior: They increased the occurrence of head movements, mouthing, and hindlimb stepping. Quipazine and alpha-Me-5-HT also promoted hindlimb activity in spinal fetuses. Thus, stimulation of the fetal 5-HT system modulates motor activity at multiple levels of the developing central nervous system.
Laboratory of Comparative Ethogenesis, Department of Psychology, University of Iowa, Iowa City 52242, USA. michele-brumley@uiowa.edu
Michele R
MR
Brumley
Scott R
SR
Robinson
D000704:Analysis of Variance; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004622:Embryo, Mammalian; D005260:Female; D006614:Hindlimb / Q000187:drug effects* / Q000503:physiopathology; D008297:Male; D009043:Motor Activity / Q000187:drug effects* / Q000502:physiology; D011247:Pregnancy; D011597:Psychomotor Performance / Q000187:drug effects*; D011810:Quinoxalines / Q000494:pharmacology; D011814:Quipazine / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012701:Serotonin / Q000031:analogs & derivatives / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*; D013119:Spinal Cord Injuries / Q000188:drug therapy* / Q000503:physiopathology*
D011810:Quinoxalines; D017366:Serotonin Receptor Agonists; C052561:CGS 12066B; C042390:alpha-methylserotonin; D012701:Serotonin; D011814:Quipazine