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2014 ; 10
(8
): 2328-35
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Thimerosal compromises human dendritic cell maturation, IL-12 production,
chemokine release, and T-helper polarization
#MMPMID25424939
Loison E
; Gougeon ML
Hum Vaccin Immunother
2014[]; 10
(8
): 2328-35
PMID25424939
show ga
Thimerosal is a preservative used in multidose vials of vaccine formulations to
prevent bacterial and fungal contamination. We recently reported that nanomolar
concentrations of thimerosal induce cell cycle arrest of human T cells activated
via the TCR and inhibition of proinflammatory cytokine production, thus
interfering with T-cell functions. Given the essential role of dendritic cells
(DCs) in T-cell polarization and vaccine immunity, we studied the influence of
non-toxic concentrations of thimerosal on DC maturation and functions. Ex-vivo
exposure of human monocyte-derived DCs to nanomolar concentrations of thimerosal
prevented LPS-induced DC maturation, as evidenced by the inhibition of
morphological changes and a decreased expression of the maturation markers CD86
and HLA-DR. In addition thimerosal dampened their proinflammatory response, in
particular the production of the Th1 polarizing cytokine IL-12, as well as TNF-?
and IL-6. DC-dependent T helper polarization was altered, leading to a decreased
production of IFN-? IP10 and GM-CSF and increased levels of IL-8, IL-9, and
MIP-1?. Although multi-dose vials of vaccines containing thimerosal remain
important for vaccine delivery, our results alert about the ex-vivo
immunomodulatory effects of thimerosal on DCs, a key player for the induction of
an adaptive response.