Intestinal absorption of (-)-carbovir in the rat.
(-)-Carbovir (CBV) is a carbocyclic nucleoside analogue with in vitro activity against the human immunodeficiency virus. The sites and mechanism of absorption of (-)-CBV from the rat small intestine were studied in the anesthetized male Sprague-Dawley rat. (-)-CBV was perfused through either duodenal, jejunal, or ileal segments at three concentration levels ranging from 1 to 500 micrograms/mL. The fraction remaining to be absorbed at steady-state and the absorptive clearance were calculated for each experiment. The effect of solvent drag on the absorptive clearance was also investigated. Two-way ANOVA for the absorptive clearance per unit length was not significant for either (-)-CBV concentration or site of perfusion. The fraction remaining to be absorbed at steady-state was found to be 0.804 +/- 0.091 (n = 30). A strong correlation was found between the absorptive clearance and the net water absorptive flux. The mechanism of (-)-CBV absorption across the rat small intestine apparently consists of both passive diffusion and convection.
Soria
I
I
Department of Pharmaceutics, University of Minnesota, Minneapolis 55455.
Zimmerman
C L
CL
D000704:Analysis of Variance; D000818:Animals; D000998:Antiviral Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D015224:Dideoxynucleosides / Q000008:administration & dosage / Q000493:pharmacokinetics*; D007408:Intestinal Absorption; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012997:Solvents; D013237:Stereoisomerism
D000998:Antiviral Agents; D015224:Dideoxynucleosides; D012997:Solvents; C057503:carbovir