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2017 ; 8
(ä): 154
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?2?1-Fructans Modulate the Immune System In Vivo in a Microbiota-Dependent
and?-Independent Fashion
#MMPMID28261212
Fransen F
; Sahasrabudhe NM
; Elderman M
; Bosveld M
; El Aidy S
; Hugenholtz F
; Borghuis T
; Kousemaker B
; Winkel S
; van der Gaast-de Jongh C
; de Jonge MI
; Boekschoten MV
; Smidt H
; Schols HA
; de Vos P
Front Immunol
2017[]; 8
(ä): 154
PMID28261212
show ga
It has been shown in vitro that only specific dietary fibers contribute to
immunity, but studies in vivo are not conclusive. Here, we investigated degree of
polymerization (DP) dependent effects of ?2?1-fructans on immunity via
microbiota-dependent and -independent effects. To this end, conventional or
germ-free mice received short- or long-chain ?2?1-fructan for 5?days. Immune cell
populations in the spleen, mesenteric lymph nodes (MLNs), and Peyer's patches
(PPs) were analyzed with flow cytometry, genome-wide gene expression in the ileum
was measured with microarray, and gut microbiota composition was analyzed with
16S rRNA sequencing of fecal samples. We found that ?2?1-fructans modulated
immunity by both microbiota and microbiota-independent effects. Moreover, effects
were dependent on the chain-length of the ?2?1-fructans type polymer. Both short-
and long-chain ?2?1-fructans enhanced T-helper 1 cells in PPs, whereas only
short-chain ?2?1-fructans increased regulatory T cells and CD11b(-)CD103(-)
dendritic cells (DCs) in the MLN. A common feature after short- and long-chain
?2?1-fructan treatment was enhanced 2-alpha-l-fucosyltransferase 2 expression and
other IL-22-dependent genes in the ileum of conventional mice. These effects were
not associated with shifts in gut microbiota composition, or altered production
of short-chain fatty acids. Both short- and long-chain ?2?1-fructans also induced
immune effects in germ-free animals, demonstrating direct effect independent from
the gut microbiota. Also, these effects were dependent on the chain-length of the
?2?1-fructans. Short-chain ?2?1-fructan induced lower CD80 expression by
CD11b(-)CD103(-) DCs in PPs, whereas long-chain ?2?1-fructan specifically
modulated B cell responses in germ-free mice. In conclusion, support of immunity
is determined by the chemical structure of ?2?1-fructans and is partially
microbiota independent.