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Infection and Immunity, August 2000, p. 4505-4517, Vol. 68, No. 8
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Variability of Outer Membrane Protein P1 and Its Evaluation as a Vaccine Candidate against Experimental Otitis Media due to Nontypeable Haemophilus influenzae: an Unambiguous, Multifaceted Approach

Gilles R. Bolduc,dagger Valérie Bouchet, Ru-Zhang Jiang,Dagger Janet Geisselsoder, Que Chi Truong-Bolduc, Peter A. Rice, Stephen I. Pelton, and Richard Goldstein*

The Maxwell Finland Laboratory for Infectious Diseases, Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts 02118

Received 11 February 2000/Returned for modification 23 March 2000/Accepted 5 May 2000

Candidate vaccine antigens for preventing otitis media caused by nontypeable Haemophilus influenzae (NTHI) should possess one or more conserved epitopes. We sought to evaluate the candidacy of P1, a surface-expressed outer membrane protein knowing that this antigen is subject to diversifying selection. Therefore, we selected NTHI strains from among >500 phylogenically variant isolates representative of the diversity found in natural populations of H. influenzae. Twenty-three variants of P1 (<= 95% similarity) were identified among 42 strains. When chinchillas were immunized with recombinant P1 (rP1) obtained from one of these isolates (BCH-3), all animals developed antibodies specific for rP1. Immunized animals were protected against disease when challenged with BCH-3, but not with an ompP1 mutant of BCH-3 or a strain (BCH-2) possessing a heterologous P1 (91% identity). We conclude that (i) while P1 induces protection against NTHI-mediated otitis media, development of a polyvalent vaccine reflecting the variability of P1 would be necessary to construct an efficacious vaccine and (ii) use of a phylogenically characterized collection of representative isolates in concert with gene sequencing, cloning, gene inactivation, and animal testing offers an efficient, rational, and rigorous strategy for evaluating the potential problems associated with variability of vaccine targets and specificity of related immune responses.

* Corresponding author. Mailing address: Section of Molecular Genetics, Division of Pediatric Infectious Diseases, Maxwell Finland Laboratory for Infectious Diseases, Boston University School of Medicine, 774 Albany St., Boston, MA 02118. Phone: (617) 638-5328. Fax: (617) 414-7222. E-mail: genetics{at}bu.edu.

dagger Present address: Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.

Dagger Present address: Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai University, Tianjin 300071, People's Republic of China.

Infection and Immunity, August 2000, p. 4505-4517, Vol. 68, No. 8
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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