期刊
JOURNAL OF PHARMACEUTICAL SCIENCES
卷 94, 期 6, 页码 1216-1225出版社
ELSEVIER SCIENCE INC
DOI: 10.1002/jps.20344
关键词
nelfinavir; P-glycoprotein; tissue distribution; P-gp inhibitor; GF120918
资金
- NIAID NIH HHS [AI 52663] Funding Source: Medline
- NIGMS NIH HHS [GM 62883] Funding Source: Medline
- NINDS NIH HHS [NS 39178] Funding Source: Medline
Insufficient concentrations of protease inhibitors such as nelfinavir may reduce the effectiveness of HIV dementia treatment. The efflux transporter mdr1 product P-glycoprotein (P-gp) has been demonstrated to play a role in limiting nelfinavir brain levels. The goal of this study was to compare the effect of GF120918 (10 mg/kg, IV), a P-gp inhibitor, on intravenous nelfinavir (10 mg/kg) in vivo disposition and tissue penetration in P-gp-competent mdr1a/1b (+/+) mice versus P-gp double knockout mdr1a/1b mice. Intravenous administration with the P-gp inhibitor GF120918 to mdr1a/1b mice increased nelfinavir concentrations over a range of 2.3- to 27-fold, whereas nelfinavir distribution in mdr1a/1b (-/-) mice was 2- to 16-fold higher than that in their wild counterparts. Nelfinavir levels after GF120918 coadministration were higher in the heart, liver, and kidneys than those detected with mdr1a/1b knockout mice. In contrast, mdr1a/1b knockout mice exhibited higher nelfinavir levels in the brain (16.1-fold vs. 8.9-fold increase) and spleen (4.1-fold vs. 2.3-fold increase) compared to pharmacological inhibition with GF120918 in wild mice. Most notably, GF120918 provided tissue-specific effects in mdr1a/1b knockout mice with enhanced (p < 0.05) drug accumulation in the brain (similar to 21-fold) and heart (3.3-fold). Our results suggest mdr1a/1b-independant mechanisms may also contribute to nelfinavir tissue distribution in mice. (C) 2005 Wiley-Liss, Inc. and the American Pharmacists Association.
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