Antigen-specific immunoglobulin variable region sequencing measures humoral immune response to vaccination in the equine neonate

PloS One
Rebecca L TallmadgeM Julia B Felippe

Abstract

The value of prophylactic neonatal vaccination is challenged by the interference of passively transferred maternal antibodies and immune competence at birth. Taken our previous studies on equine B cell ontogeny, we hypothesized that the equine neonate generates a diverse immunoglobulin repertoire in response to vaccination, independently of circulating maternal antibodies. In this study, equine neonates were vaccinated with 3 doses of keyhole limpet hemocyanin (KLH) or equine influenza vaccine, and humoral immune responses were assessed using antigen-specific serum antibodies and B cell Ig variable region sequencing. An increase (p<0.0001) in serum KLH-specific IgG level was measured between days 21 and days 28, 35 and 42 in vaccinated foals from non-vaccinated mares. In vaccinated foals from vaccinated mares, serum KLH-specific IgG levels tended to increase at day 42 (p = 0.07). In contrast, serum influenza-specific IgG levels rapidly decreased (p≤0.05) in vaccinated foals from vaccinated mares within the study period. Nevertheless, IGHM and IGHG sequences were detected in KLH- and influenza- sorted B cells of vaccinated foals, independently of maternal vaccination status. Immunoglobulin nucleotide germline identity, IGHV gene...Continue Reading

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Datasets Mentioned

BETA
KJ741369-KJ741385

Methods Mentioned

BETA
ELISAs
ELISA
Fluorescence
Flow Cytometry
PCR
flow

Software Mentioned

R
lsmeans
Ascent
GraphPad
Geneious
GraphPad Prism
lme4

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