TY - JOUR
T1 - Blocking TH17-polarizing cytokines by histone deacetylase inhibitors in vitro and in vivo
AU - Bosisio, Daniela
AU - Vulcano, Marisa
AU - Del Prete, Annalisa
AU - Sironi, Marina
AU - Salvi, Valentina
AU - Salogni, Laura
AU - Riboldi, Elena
AU - Leoni, Flavio
AU - Dinarello, Charles A.
AU - Girolomoni, Giampiero
AU - Sozzani, Silvano
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Histone deacetylase (HDAC) inhibitors are small molecules inducing cell-cycle arrest, differentiation, and apoptosis, currently undergoing clinical trials as anticancer drugs. In addition, emerging evidence suggests HDAC inhibitors may have anti-inflammatory and immunomodulatory properties as well, although the molecular mechanisms remain poorly defined. Given the central role of dendritic cells (DC) in the induction and maintenance of the inflammatory and immune response, we investigated the effects of HDAC inhibitors on the maturation and activation of human monocyte-derived DC in the presence of LPS and IFN-γ. Our results show that the production of TH1- and TH17-inducing cytokines, namely IL-12 and IL-23, was inhibited by trichostatin A (72% and 52%, respectively) and suberoylanilide hydroxamic acid (86% and 83%). Strikingly, HDAC inhibitors were effective if added simultaneously as well as after the proinflammatory challenge, and their effect was not associated to a reduction of expression or function of LPS/IFN-γ receptors. These findings were confirmed in two different murine models. In addition, HDAC inhibitors selectively blocked the production of T H1-attracting chemokines CXCL9, CXCL10, and CXCL11. The reduction of TH1- and TH17-inducing cytokines as well as T H1-attracting chemokines may represent relevant mechanisms through which HDAC inhibitors at nonproapoptotic doses exert their immunomodulatory properties.
AB - Histone deacetylase (HDAC) inhibitors are small molecules inducing cell-cycle arrest, differentiation, and apoptosis, currently undergoing clinical trials as anticancer drugs. In addition, emerging evidence suggests HDAC inhibitors may have anti-inflammatory and immunomodulatory properties as well, although the molecular mechanisms remain poorly defined. Given the central role of dendritic cells (DC) in the induction and maintenance of the inflammatory and immune response, we investigated the effects of HDAC inhibitors on the maturation and activation of human monocyte-derived DC in the presence of LPS and IFN-γ. Our results show that the production of TH1- and TH17-inducing cytokines, namely IL-12 and IL-23, was inhibited by trichostatin A (72% and 52%, respectively) and suberoylanilide hydroxamic acid (86% and 83%). Strikingly, HDAC inhibitors were effective if added simultaneously as well as after the proinflammatory challenge, and their effect was not associated to a reduction of expression or function of LPS/IFN-γ receptors. These findings were confirmed in two different murine models. In addition, HDAC inhibitors selectively blocked the production of T H1-attracting chemokines CXCL9, CXCL10, and CXCL11. The reduction of TH1- and TH17-inducing cytokines as well as T H1-attracting chemokines may represent relevant mechanisms through which HDAC inhibitors at nonproapoptotic doses exert their immunomodulatory properties.
KW - Autoimmunity
KW - Chemokines
KW - Dendritic cells
KW - T1/T2 cells
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U2 - 10.1189/jlb.0708401
DO - 10.1189/jlb.0708401
M3 - Article
C2 - 18780875
AN - SCOPUS:57149099029
VL - 84
SP - 1540
EP - 1548
JO - Journal of Leukocyte Biology
JF - Journal of Leukocyte Biology
SN - 0741-5400
IS - 6
ER -