Infection and Immunity, November 1999, p. 5547-5551, Vol. 67, No. 11
Centre d'Immunologie Pierre Fabre, Saint
Julien en Genevois, France
Received 20 January 1999/Returned for modification 6 April
1999/Accepted 6 August 1999
We have recently cloned a new protein, recombinant P40 (rP40). When
tested in vivo after conjugation to a B-cell epitope, rP40 induces an
important antibody response without the need for adjuvant. To
characterize its potency, this carrier protein was coupled to a peptide
derived from respiratory syncytial virus attachment G protein (G1').
After immunization of mice with the rP40-G1' conjugate, strong
antipeptide antibodies were detected, whereas peptide alone was not
immunogenic. To emphasize the carrier properties of rP40, a
polysaccharide derived from Haemophilus influenzae type b
(Hib) was coupled to it. Immunoglobulin G responses against the Hib
polysaccharide were observed after coupling to rP40. Interestingly, an
antipeptide antibody response was observed despite preexisting
anti-rP40 antibodies generated by preimmunization with rP40. In
addition, rP40 compares well with the reference carrier protein,
tetanus toxoid (TT), since antibody responses of equal intensity were
observed when a peptide or a polysaccharide was coupled to TT and rP40.
Moreover, rP40 had advantages compared to TT; e.g., it induced a mixed
Th1/Th2 response, whereas TT induced only a Th2 profile. Together, the
results indicate that rP40 is a novel carrier protein with potential
for use as an alternative carrier for human vaccination.
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Carrier Properties of a Protein Derived from Outer
Membrane Protein A of Klebsiella pneumoniae
*
Corresponding author. Mailing address: Centre
d'Immunologie Pierre Fabre, Saint Julien en Genevois, France. Phone:
33-4-50-35-35-74. Fax: 33-4-50-35-35-90. E-mail:
nathalie.corvaia{at}pierre.fabre.com.
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