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2015 ; 2015
(ä): 340468
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Non-CpG Oligonucleotides Exert Adjuvant Effects by Enhancing Cognate B Cell-T
Cell Interactions, Leading to B Cell Activation, Differentiation, and Isotype
Switching
#MMPMID26380319
Herbáth M
; Papp K
; Erdei A
; Prechl J
J Immunol Res
2015[]; 2015
(ä): 340468
PMID26380319
show ga
Natural and synthetic nucleic acids are known to exert immunomodulatory
properties. Notably, nucleic acids are known to modulate immune function via
several different pathways and various cell types, necessitating a complex
interpretation of their effects. In this study we set out to compare the effects
of a CpG motif containing oligodeoxynucleotide (ODN) with those of a control and
an inhibitory non-CpG ODN during cognate B cell-T cell interactions. We employed
an antigen presentation system using splenocytes from TCR transgenic DO11.10 mice
and the ovalbumin peptide recognized by the TCR as model antigen. We followed
early activation events by measuring CD69 expression, late activation by MHC
class II expression, cell division and antibody production of switched, and
nonswitched isotypes. We found that both of the tested non-CpG ODN exerted
significant immunomodulatory effects on early T cell and on late B cell
activation events. Importantly, a synergism between non-CpG effects and T cell
help acting on B cells was observed, resulting in enhanced IgG production
following cognate T cell-B cell interactions. We propose that non-CpG ODN may
perform as better adjuvants when a strong antigen-independent immune activation,
elicited by CpG ODNs, is undesirable.