Petra K. E. Johansson

Learn More
Single intraperitoneal doses of various antipsychotic drugs (clozapine 6, 12, 25 mg/kg, sulpiride 100 mg/kg, haloperidol 0.5, 1.0, 2.0 mg/kg, fluphenazine 0.5, 1.0, 2.0 mg/kg) induced a depression of the spontaneous chewing movement (SCM) rate in rats during the first 6-8 hours. Haloperidol and fluphenazine elicited a rebound increase in SCM on day 2-5,(More)
Oral movements in rats administered one of three doses of either a D1 agonist (SK&F 38393) or a D2 agonist (LY171555) were observed via closed-circuit television and simultaneously recorded using a computerized video analysis system which measured the distance between two fluorescent dots painted above and below the rat's mouth. The D1 agonist SK&F 38393(More)
Image quality in preimplant computerized tomography (CT) examinations made with different radiation doses (40 to 280 mAs) and scanning modes (standard and helical axial, 15-degree angled, and frontal) and in conventional spiral tomography (Scanora) was compared. Mandibular canal and alveolar bone crest visibility was evaluated in images from mandibular jaw(More)
There is evidence for the view that both up- and downregulation of nigral GABA may give rise to dyskinetic movements. Intranigral infusion of GABA agonists causes stereotyped licking and gnawing in rats, while intranigral GABA antagonists produce vacuous chewing movements. It is hypothesized that during long-term neuroleptic treatment there may be a(More)
Melperone and haloperidol were compared in a rat model for tardive dyskinesia. Drugs were given chronically for 12 months with the drinking water and the frequency of oral movements was measured at monthly intervals. Haloperidol (0.2 and 0.4 mg/kg/d) produced an increase in vacuous chewing movements, whereas melperone (2.4, 5.1 and 11.0 mg/kg/d) did not(More)
Tardive dyskinesia has been connected with regional reductions of GABA functions in the basal ganglia. In view of the possibility that peptides are involved in neuroleptic-induced dyskinesias substance P and dynorphin A levels were measured in the basal ganglia of the Cebus apella model for tardive dyskinesia. In addition, regional glutamate decarboxylase(More)
Synthetic agonists for the tachykinin NK1 and NK3 receptors were bilaterally infused at three dose levels (4.2, 0.17, and 0.007 nmol) into each substantia nigra of freely moving rats and oral behaviors were monitored for 30 min postinfusion. It was found that all doses of senktide, an agonist at the NK3 receptor, induced a significant increase of(More)
—Many stingray species replace their poisonous caudal spines seasonally; however, it is hypothesized that spine replacement may also be induced through a traumatic injury to the caudal spine. To determine whether the round stingray, Urobatis halleri, can replace damaged spines outside of normal spine shedding season, secondary spine growth of stingrays with(More)
  • 1