3-Methoxy-4-hydroxy-phenylglycol sulfate (MOPEG-SO4) in ventricular and cisternal cerebrospinal fluid of dogs

Stereotyped behavior and hyperthermia in dogs: correlation with the levels of amphetamine and p-hydroxyamphetamine in plasma and CSF

A gas-chromatographic method for simultaneously measuring p-hydroxyamphetamine (pOA) against amphetamine (A) in plasma and CSF is presented. The time course of body temperature (Tb), stereotyped behavior (St), and A and pOA levels in plasma and CSF were studied after administration of 0.6 and 1.5 mg/kg p.o. of A to dogs. Stereotyped behavior reached maximal value 2.5 h after A, as did levels of A in CSF. The A levels in CSF decreased steadily in the following hours and simultaneously with the levels of A in plasma. St remained elevated and began to decrease after 6.5 h. The relationship between St and amounts of A was not linear but exponential. This suggest that both A and its metabolite contributed to this effect. In fact, a linear relationship was found between St and the amounts of pOA in CSF. Body temperature had a time course similar to A plasma levels, reaching peak value after 1.5 h and declining thereafter simultaneously with A. A linear relationship was found between Tb and the amounts of A in plasma. Thus Tb seems to be a peripheral A effect related to the presence of the drug in plasma.

Acetylcholinesterase activity in ventricular and cisternal CSF of dogs: effect of chlorpromazine

Acetylcholinesterase (AChE) activity in dog plasma is significantly higher than in either ventricular or cisternal CSF. However, since protein levels in plasma are about 100-fold higher than in CSF, the specific activity of AChE is lower in plasma than in CSF. Acetylcholinesterase activity in plasma represents only 22% of total cholinesterase (ChE) activity, while preliminary findings indicate that in ventricular CSF it is 50-60%. Acetylcholinesterase activity in ventricular CSF is significantly lower than in cisternal CSF. Chlorpromazine (10 mg/kg, intravenous), a drug which increases acetylcholine turnover, increased AChE-specific activity in all dogs. Our results support the hypothesis of a neuronal origin of AChE activity in CSF.