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Clinical and Diagnostic Laboratory Immunology, 07 1997, 415-422, Vol 4, No. 4
S Romero-Steiner, D Libutti, LB Pais, J Dykes, P Anderson, JC Whitin, HL Keyserling and GM Carlone
Host protection against pneumococcal disease i primarily mediated by
phagocytosis. We developed and standardized an opsonophagocytic assay using
HL-60 cells (human promyelocytic leukemia cells). Fifty-five serum samples
were analyzed for the presence of functional antibody against seven
pneumococcal serogroups or serotypes (4, 6B, 9V, 14, 18C, 19F, and 23F) by
using differentiated HL-60 cells (granulocytes) and peripheral blood
leukocytes (PBLs). Six of the 55 serum samples were from unvaccinated adult
volunteers, 31 serum samples were from adults who received one dose of the
14-valent or the 23-valent polysaccharide vaccine, and 18 serum samples
were from 16-month-old infants who received four doses of an
investigational 7-valent polysaccharide- protein conjugate vaccine. The
results of an opsonophagocytic assay with HL-60 cells correlated highly
with those of an assay with PBLs as effector cells (median r for seven
serotypes = 0.87: P < 0.01). Opsonophagocytic titers were compared with
the immunoglobulin G antibody concentrations determined by enzyme-linked
immunosorbent assay (ELISA). The r values for serogroups or serotypes 4,
6B, 9V, 14, 18C, 19F, and 23F were 0.61, 0.60, 0.67 0.90, 0.61, 0.39, and
0.57, respectively, when HL-60 cells were used as effector cells and 0.56,
0.47, 0.61, 0.90, 0.71, 0.31, and 0.62, respectively, when PBLs were used.
The assay requires small amounts of serum (40 microliters per serotype),
making this test suitable for assaying infant sera. Culturable cells aid in
assay standardization and likely reduce donor- to-donor variability. This
standardized assay, in combination with the standardized ELISA, can be used
to evaluate current and developing pneumococcal vaccines, in which
functional opsonophagocytic antibody activity may correlate with protection
against pneumococcal disease.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Standardization of an opsonophagocytic assay for the measurement of functional antibody activity against Streptococcus pneumoniae using differentiated HL-60 cells
Division of Bacterial and Mycotic Diseases, Centers for Disease control and Prevention, Atlanta, Georgia 30333, USA.
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