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2015 ; 5
(ä): 14046
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Promotion of regulatory T cell induction by immunomodulatory herbal medicine
licorice and its two constituents
#MMPMID26370586
Guo A
; He D
; Xu HB
; Geng CA
; Zhao J
Sci Rep
2015[Sep]; 5
(ä): 14046
PMID26370586
show ga
Regulatory T cells (Treg) play a critical role to control immune responses and to
prevent autoimmunity, thus selective increase of Treg cells in vivo has broad
therapeutic implications for autoimmune and inflammatory diseases. Licorice is a
well-known herbal medicine used worldwide for over thousands of years, and
accumulating evidence has shown its immunomodulatory potential. However, it is
not clear whether licorice could regulate the induction and function of Treg
cells. Here we found licorice extract could promote Treg cell induction, and then
we used a rational approach to isolate its functional fractions and constituents.
The results showed that two constituents, isoliquiritigenin and naringenin,
promoted Treg cell induction both in vitro and in vivo. The effective fractions
and two constituents of licorice also enhanced immune suppression of Treg cells,
and they further reduced severity of DSS-induced colitis in mice. This study
suggested that promotion of regulatory T cell induction could be an underlying
mechanism of the historically and widely used herbal medicine licorice, providing
its two effective molecules against autoimmune and inflammatory diseases.