The HDAC Inhibitor, SAHA, Prevents Colonic Inflammation by Suppressing Pro-inflammatory Cytokines and Chemokines in DSS-induced Colitis

• Published in: ACTA HISTOCHEMICA ET CYTOCHEMICA 2018/02/27, Vol.51(1), pp.33-40
• Main Authors: Ali, Mohmand Noor, Choijookhuu, Narantsog, Takagi, Hideaki, Srisowanna, Naparee, Huynh, Mai Nguyen Nhat, Yamaguchi, Yuya, Oo, Phyu Synn, Kyaw, Myat Tin Htwe, Sato, Katsuaki, Yamaguchi, Ryoji, Hishikawa, Yoshitaka
• Format: Article
• Language: English
• Subjects: Acetylation; Animal models; CD11b antigen; Cell migration; Chemokines; Colitis; Colon; Cytokines; Dendritic cells; Dextran; dextran sodium sulfate; Dextran sulfate; Epigenetics; Gastrointestinal tract; Gene expression; Histone deacetylase; histone deacetylase inhibitor; Hydroxamic acid; Immune system; Immunohistochemistry; Inflammatory bowel disease; Inflammatory bowel diseases; Inflammatory diseases; Interleukin 6; Intestine; Localization; Macrophages; Monocyte chemoattractant protein 1; Monocytes; pro-inflammatory cytokines and chemokines; Regular; Rodents; Tumor necrosis factor-TNF
• ISSN: 0044-5991; 1347-5800
• DOI: 10.1267/ahc.17033

Inflammatory bowel disease (IBD) is an inflammatory disorder of the gastrointestinal tract that is caused by multiple factors, including dysfunction of the immune system and genetic and epigenetic alterations. Aberrant epigenetic regulation, especially histone acetylation, was found in biopsies from IBD patients and mouse models of colitis, suggesting that an epigenetic treatment approach may be useful for IBD therapy. Therefore, we investigated the effects of the histone deacetylase (HDAC) inhibitor, suberoylanilide hydroxamic acid (SAHA), in a mouse model of dextran sulfate sodium (DSS)-induced colitis. C57BL/6 mice were treated with 1.5% DSS for 5 days and/or SAHA (25 mg/kg BW/day) for 26 days. Levels of mRNA for the pro-inflammatory cytokines, interleukin (IL)-6 and tumor necrosis factor (TNF)-α, and the chemokines, Ccl2, were examined by qRT-PCR. CD11b, a marker of dendritic cells, macrophages, and monocytes, as well as Ccl2 expression, were examined by immunohistochemistry. IL-6, TNF-α, and Ccl2 gene expression peaked on day 5 in DSS-treated mouse colon, whereas SAHA treatment significantly decreased pro-inflammatory gene expression. Ccl2 protein expression resembled Ccl2 gene expression results. Moreover, localization of CD11b showed that migratory inflammatory cells were dramatically decreased by SAHA treatment compared to DSS-treated mouse colon. Thus, we conclude that the HDAC inhibitor, SAHA, attenuates inflammatory changes in DSS-induced colitis by suppressing local secretion of pro-inflammatory cytokines and chemokines and also by suppressing mobilization and accumulation of inflammatory cells.