Pharmacokinetic characterization of dehydroevodiamine in the rat brain.
The objective of this study was to examine the kinetics of the distribution of dehydroevodiamine (DHED) in the rat brain. After an intravenous infusion of 15 min (dose of 1-10 mg/kg), the temporal profiles of the plasma levels of DHED declined in a multiexponential manner. Moment analysis indicated that the clearance and steady-state volume of distribution for DHED were not statistically different with the dose, indicating that the pharmacokinetics for DHED is linear in the range examined. Nonlinear regression analysis of DHED concentrations in the plasma and the brain revealed that the linear kinetics into and out from the brain reasonably described the data and that the clearances for influx into and efflux from the brain were comparable. Transport clearances for DHED across MBEC4 monolayers, an in vitro model of the blood-brain barrier, were also comparable for influx and efflux, and were independent of the medium concentration. The concentration of DHED in cerebrospinal fluid was negligible compared with that found in plasma, indicating that the drug is not primarily distributed to the brain via the blood-cerebrospinal fluid barrier. These observations indicate that DHED is transported from the systemic circulation to the brain via the blood-brain barrier by linear kinetics.
Ahn
Sung-Hoon
SH
Department of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea.
Jeon
Seng-Ho
SH
Tsuruo
Takashi
T
Shim
Chang-Koo
CK
Chung
Suk-Jae
SJ
D000465:Algorithms; D000470:Alkaloids / Q000097:blood / Q000134:cerebrospinal fluid / Q000493:pharmacokinetics*; D000818:Animals; D019540:Area Under Curve; D001921:Brain / Q000378:metabolism*; D002460:Cell Line; D002800:Cholinesterase Inhibitors / Q000097:blood / Q000134:cerebrospinal fluid / Q000493:pharmacokinetics*; D002851:Chromatography, High Pressure Liquid; D007275:Injections, Intravenous; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013056:Spectrophotometry, Ultraviolet
D000470:Alkaloids; D002800:Cholinesterase Inhibitors; C028633:dehydroevodiamine