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Impact of IgM Antibodies on Cross-Protection against Pneumococcal Serogroups 6 and 19 after Immunization with 7-Valent Pneumococcal Conjugate Vaccine in Children

Title
Impact of IgM Antibodies on Cross-Protection against Pneumococcal Serogroups 6 and 19 after Immunization with 7-Valent Pneumococcal Conjugate Vaccine in Children
Authors
Cho, Hye-KyungPark, In HoBurton, Robert L.Kim, Kyung-Hyo
Ewha Authors
김경효
SCOPUS Author ID
김경효scopus
Issue Date
2016
Journal Title
JOURNAL OF KOREAN MEDICAL SCIENCE
ISSN
1011-8934JCR Link1598-6357JCR Link
Citation
vol. 31, no. 6, pp. 950 - 956
Keywords
Streptococcus pneumoniaeHeptavalent Pneumococcal Conjugate VaccinePneumococcal Polysaccharide Type 6Pneumococcal Polysaccharide Type 19Immunoglobulin M
Publisher
KOREAN ACAD MEDICAL SCIENCES
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
Although it is well known that pneumococcal conjugate vaccines provide cross-protection against some vaccine-related serotypes, these mechanisms are still unclear. This study was performed to investigate the role of cross-protective IgM antibodies against vaccine-related serotypes 6A, 6C, and 19A induced in children aged 12-23 months after immunization with 7-valent pneumococcal conjugate vaccine (PCV7). We obtained serum samples from 18 Korean children aged 12-23 months after a PCV7 booster immunization. The serum IgG and IgM concentrations of serotypes 6B and 19F were measured by enzyme-linked immunosorbent assay (ELISA) in serum. The opsonic indices (OIs) against vaccine serotypes 6B and 19F and vaccine-related serotypes 6A, 6C, and 19A were determined by an opsonophagocytic killing assay (OPA) in IgM-depleted and control serum. Both IgG and IgM antibodies in ELISA and opsonic indices in OPA against serotypes 6B and 19F were demonstrated in the immune serum. IgM depletion decreased the OIs against vaccine serotypes 6B (geometric means of OIs (GMIs) of 3,009 vs. 1,396, 38% reduction) and 19F (1,117 vs. 750, 36% reduction). In addition, IgM depletion markedly decreased the OIs against vaccine-related serotypes 6A (GMIs of 961 vs. 329, 70% reduction), 6C (432 vs. 185, 72% reduction), and 19A (301 vs. 166, 58% reduction). The booster immunization PCV7 induced protective antibodies in the form of both IgG and IgM isotypes. IgM antibodies contributed to eliciting cross-protection against vaccine-related serotypes as well as against vaccine serotypes.
DOI
10.3346/jkms.2016.31.6.950
Appears in Collections:
의과대학 > 의학과 > Journal papers
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