Vaccine-induced human antibody responses to the haemophilus influenzae b polysaccharide in severe combined immunodeficient mice engrafted with human leukocytes

Alexander H. Lucas, Todd E. Siff, Karen H. Trujillo, Marina Y. Kitamura

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We examined the ability of severe combined immunodeficient (SOD) mice-human peripheral blood leukocyte (PBL) chimeras to respond to immunization with Haemophilus influenzae b polysaccharide (Hib PS) vaccines. Two to 3 wk after PBL engraftment, human-PBL-SCID mice, prepared with PBL from one of five adult donors, were immunized with free or protein-conjugated Hib PS. Antibody to Hib PS was quantitated in preim-munization and postimmunization sera. Before immunization, anti-Hib PS antibody was detectable (>10 ng/mL) in three of 40 mice. Of the 37 human-PBL-SCID mice not having detectable serum antibody before immunization, 31 produced >20 ng/mL (>2-fold increase) anti-Hib PS antibody 2 to 3 wk after immunization. Both free and protein-conjugated forms of Hib PS were immunogenic. Geometric mean anti-Hib PS antibody levels ranged from 50 to 139 ng/mL. Vaccine-induced anti-Hib PS antibodies frequently expressed Hibld-l, a cross-reactive idiotype that predominates the in vivo human antibody response to Hib PS. However, among mice engrafted with PBL from a single donor, the Hibld-l distribution was highly skewed, suggesting that clonally distinct B cells were being stimulated in individual mice. These findings indicate that human PBL transplanted into SCID mice are functionally responsive to Hib PS antigenic challenge. This system may serve as a useful model for studying the regulation and cellular requirements for human polysaccharide immunity.

Original languageEnglish (US)
Pages (from-to)132-135
Number of pages4
JournalPediatric Research
Volume32
Issue number1
DOIs
StatePublished - Jul 1992

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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