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2012 ; 91
(5
): 701-9
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Histone deacetylase inhibition facilitates GM-CSF-mediated expansion of
myeloid-derived suppressor cells in vitro and in vivo
#MMPMID22028329
Rosborough BR
; Castellaneta A
; Natarajan S
; Thomson AW
; Turnquist HR
J Leukoc Biol
2012[May]; 91
(5
): 701-9
PMID22028329
show ga
Chromatin-modifying HDACi exhibit anti-inflammatory properties that reflect their
ability to suppress DC function and enhance regulatory T cells. The influence of
HDACi on MDSCs, an emerging regulatory leukocyte population that potently
inhibits T cell proliferation, has not been examined. Exposure of
GM-CSF-stimulated murine BM cells to HDACi led to a robust expansion of monocytic
MDSC (CD11b(+)Ly6C(+)F4/80(int)CD115(+)), which suppressed allogeneic T cell
proliferation in a NOS- and HO-1-dependent manner with similar potency to control
MDSCs. The increased yield of MDSCs correlated with blocked differentiation of BM
cells and an overall increase in HSPCs (Lin(-)Sca-1(+)c-Kit(+)). In vivo, TSA
enhanced the mobilization of splenic HSPCs following GM-CSF administration and
increased the number of CD11b(+)Gr1(+) cells in BM and spleen. Increased numbers
of Gr1(+) cells, which suppressed T cell proliferation, were recovered from
spleens of TSA-treated mice. Overall, HDACi enhance MDSC expansion in vitro and
in vivo, suggesting that acetylation regulates myeloid cell differentiation.
These findings establish a clinically applicable approach to augment this rare
and potent suppressive immune cell population and support a novel mechanism
underlying the anti-inflammatory action of HDACi.