Initial evaluation of human monoclonal anti-lipid A antibody (HA-1A) in patients with sepsis syndrome.
HA-1A, a human monoclonal immunoglobulin M antibody that binds specifically to the lipid A domain of endotoxin, was administered to septic patients to evaluate the safety, pharmacokinetics, and immunogenicity of the antibody. Thirty-four patients received a single infusion of either 25 mg, 100 mg, or 250 mg, and were followed clinically for 14 to 21 days after treatment. HA-1A serum levels were measured before infusion and frequently after infusion with a radiometric assay. A one-compartment pharmacokinetic model was fit to the measured serum levels, and accurately described the changes in HA-1A level over time in each dose group (r2 = .99). The mean +/- SEM apparent volume of distribution of HA-1A was 48.5 +/- 4.5 ml/kg, and the mean serum clearance was 2.8 +/- 0.4 ml/kg.h. The mean serum half-life of HA-1A was 15.9 +/- 1.5 h. The mean serum level one hour after a 100-mg dose was 33.2 +/- 2.4 micrograms/ml, and the mean concentration 24 h later was 9.1 +/- 1.6 micrograms/ml. The dose administered and presence of Gram-negative bacterial infection did not significantly influence the volume of distribution or serum clearance. No adverse reactions to HA-1A were observed, and no antibodies against HA-1A were detected in any patient. These data indicate that the pharmacokinetics of HA-1A are well described by a one-compartment pharmacokinetic model, and that HA-1A is safe and nonimmunogenic in patients with sepsis.
Fisher
C J
CJ
Case Western Reserve University, Cleveland, OH 44106.
Zimmerman
J
J
Khazaeli
M B
MB
Albertson
T E
TE
Dellinger
R P
RP
Panacek
E A
EA
Foulke
G E
GE
Dating
C
C
Smith
C R
CR
LoBuglio
A F
AF
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000493:pharmacokinetics / Q000627:therapeutic use*; D001426:Bacterial Proteins / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D004731:Endotoxins / Q000276:immunology*; D005260:Female; D006090:Gram-Negative Bacteria; D006801:Humans; D008050:Lipid A / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D008956:Models, Chemical; D010865:Pilot Projects; D018805:Sepsis / Q000097:blood / Q000276:immunology / Q000628:therapy*
D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D004731:Endotoxins; D008050:Lipid A; C027315:lipid A-associated protein, Bacteria