title: The comparative disposition and metabolism of dolutegravir, a potent HIV-1 integrase inhibitor, in mice, rats, and monkeys.
abstract: 1. Plasma clearance of dolutegravir, an unboosted HIV-1 integrase inhibitor, was low in rat and monkey (0.23 and 2.12 mL/min/kg, respectively) as was the volume of distribution (0.1 and 0.28 L/kg, respectively) with terminal elimination half-life approximately 6 h. Dolutegravir was rapidly absorbed from oral solution with a high bioavailability in rat and monkey (75.6 and 87.0% respectively), but solubility or dissolution rate limited when administered as suspension. 2. Dolutegravir was highly bound (>99%) to serum proteins in rat and monkey, similar to binding to plasma and serum proteins in human. Radioactivity was associated with the plasma versus cellular components of blood across all species. 3. Following oral administration to rats, [(14)C]dolutegravir-related radioactivity was distributed to most tissues, due in part to high permeability; however, because of high plasma protein binding, tissue to blood ratios were low. In mouse, rat and monkey, the absorbed dose was extensively metabolized and secreted into bile, with the majority of the administered radioactivity eliminated in feces within 24 h. 4. The primary route of metabolism of dolutegravir was through the formation of an ether glucuronide. Additional biotransformation pathways: benzylic oxidation followed by hydrolysis to an N-dealkylated product, glucose conjugation, oxidative defluorination, and glutathione conjugation.
authors.affiliation: Department of Preclinical Drug Metabolism and Pharmacokinetics, GlaxoSmithKline, Research Triangle Park , NC , USA and.
authors.forename: Lee
authors.initials: L
authors.lastname: Moss
authors.forename: David
authors.initials: D
authors.lastname: Wagner
authors.forename: Eri
authors.initials: E
authors.lastname: Kanaoka
authors.forename: Katie
authors.initials: K
authors.lastname: Olson
authors.forename: Yun Lan
authors.initials: YL
authors.lastname: Yueh
authors.forename: Gary D
authors.initials: GD
authors.lastname: Bowers
mesh_terms: D000818:Animals; D001646:Bile / Q000737:chemistry; D001682:Biological Availability; D002250:Carbon Radioisotopes; D005260:Female; D019428:HIV Integrase Inhibitors / Q000032:analysis / Q000378:metabolism* / Q000493:pharmacokinetics; D006575:Heterocyclic Compounds, 3-Ring / Q000032:analysis / Q000378:metabolism* / Q000493:pharmacokinetics; D008252:Macaca fascicularis; D008297:Male; D051379:Mice; D010078:Oxazines; D010879:Piperazines; D011728:Pyridones; D017207:Rats, Sprague-Dawley; D014018:Tissue Distribution; D000099226:Dolutegravir
chemical_list: D002250:Carbon Radioisotopes; D019428:HIV Integrase Inhibitors; D006575:Heterocyclic Compounds, 3-Ring; D010078:Oxazines; D010879:Piperazines; D011728:Pyridones; D000099226:Dolutegravir
keywords: Distribution; HIV-1 integrase inhibitor; metabolite identification; pharmacokinetics; radiochemical profiling