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Antimicrobial Agents and Chemotherapy, June 2000, p. 1667-1673, Vol. 44, No. 6
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
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
(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.
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