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Antimicrobial Agents and Chemotherapy, June 2000, p. 1667-1673, Vol. 44, No. 6
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Pharmacokinetics and Safety of AMD-3100, a Novel Antagonist of
the CXCR-4 Chemokine Receptor, in Human Volunteers
Craig W.
Hendrix,1,*
Charles
Flexner,1
Ronald T.
MacFarland,2
Christen
Giandomenico,2
Edward J.
Fuchs,1
Ella
Redpath,1
Gary
Bridger,2 and
Geoffrey
W.
Henson2
Division of Clinical Pharmacology, Johns
Hopkins University School of Medicine, Baltimore, Maryland
21287,1 and AnorMED, Inc., Langley,
British Columbia, Canada V2Y 1N52
Received 9 August 1999/Returned for modification 15 January
2000/Accepted 18 March 2000
AMD-3100, a bicyclam, is a novel agent that uniquely inhibits the
entry of human immunodeficiency virus type 1 (HIV-1) into CD4+ T cells via selective blockade of the chemokine CXCR-4
receptor. Twelve healthy volunteers were given AMD-3100 as a
single 15-min intravenous infusion at 10, 20, 40, or 80 µg/kg. Five
subjects also received a single subcutaneous injection of AMD-3100 (40 or 80 µg/kg). Three subjects received two escalating oral doses each (80 and 160 µg/kg). All subjects tolerated their dose(s) well
without any grade 2 toxicity or dose adjustment. Six
subjects experienced mild, transient symptoms, primarily
gastrointestinal in nature and not dose related. All subjects
experienced a dose-related elevation of the white blood cell count,
from 1.5 to 3.1 times the baseline, which returned to the baseline
24 h after dosing. AMD-3100 demonstrated dose proportionality for
the maximum drug concentration in serum (Cmax)
and the area under the concentration-time curve from 0 h to
(AUC0-
) over the entire dose range. At the highest
intravenous dose (80 µg/kg), the median Cmax was 515 (range, 470 to 521) ng/ml and the
AUC0-
was 1,044 (range, 980 to 1,403) ng-h/ml. The
median systemic absorption after subcutaneous dosing was 87% (range,
67 to 106%). No drug was detectable in the blood following oral
dosing. Using a two-compartment model, the median pharmacokinetic
parameter estimates (ranges) were as follows: volume of distribution,
0.34 (0.27 to 0.36) liter/kg; clearance, 1.30 (0.97 to 1.34) liters/h;
elimination half-life, 3.6 (3.5 to 4.9) h. After a single,
well-tolerated intravenous dose of AMD-3100, concentrations were
sustained for 12 h above the in vitro antiretroviral 90%
inhibitory concentrations and for 8 h above antiviral
concentrations identified in the SCID-hu Thy/Liv mouse model of HIV infection.
*
Corresponding author. Mailing address: Division of
Clinical Pharmacology, Johns Hopkins University School of Medicine,
Harvey 502, 600 N. Wolfe St., Baltimore, MD 21287. Phone: (410)
955-9707. Fax: (410) 955-9708. E-mail: chendrix{at}jhmi.com.
Antimicrobial Agents and Chemotherapy, June 2000, p. 1667-1673, Vol. 44, No. 6
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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