Inhibition of histone deacetylase 6 improves long-term survival in a lethal septic model Journal Article

Authors: Li, Y; Zhao, T.; Liu, B.; Halaweish, I.; Mazitschek, R.; Duan, X.; Alam, H. B.
Article Title: Inhibition of histone deacetylase 6 improves long-term survival in a lethal septic model
Abstract: BACKGROUND: We recently demonstrated that suberoylanilide hydroxamic acid, a broad-spectrum histone deacetylase (HDAC) inhibitor that inhibits HDACs 1, 2, 3, and 6, improves survival in a mouse model of cecal ligation and puncture (CLP)-induced lethal sepsis. The current study was undertaken to determine the effect of selective inhibition of HDAC isoform on survival, key cytokine production, organ injury, bacteria clearance, and cell apoptosis. METHODS: In Experiment 1, C57BL/6J mice were subjected to CLP and, 1 hour later, given intraperitoneal injections of (1) Tubastatin A (inhibitor of HDAC6) dissolved in dimethyl sulfoxide (DMSO), (2) MS-275 (inhibitor of HDACs 1, 2, and 3) in DMSO, and (3) DMSO only. Survival was monitored for 10 days. In Experiment 2, 1 hour after CLP, animals were treated with DMSO vehicle or Tubastatin A. Sham-operated animals served as control. Peritoneal fluid and blood samples were collected for measurement of cytokines at 24 hours or 48 hours. Blood at 48 hours was also used to determine bacteria load. Liver was harvested to evaluate acute liver injury. In Experiment 3, Primary splenocytes were used to assess cytokine responses and phagocytosis. Macrophages were cultured and harvested 3 hours and 6 hours after lipopolysaccharide stimulation in the absence or presence of Tubastatin A to analyze cell apoptosis. RESULTS: Animals treated with Tubastatin A, but not MS-275, displayed a significant improvement in survival. Moreover, Tubastatin A significantly inhibited cytokine production in peritoneal fluid and plasma as well as in supernatant from splenocytes stimulated with lipopolysaccharide. Tubastatin A significantly attenuated acute liver injury, increased blood bacteria clearance and splenocyte phagocytosis, and decreased macrophage apoptosis. CONCLUSION: HDAC6 inhibition significantly improves survival, reduces "cytokine storm," attenuates acute livery injury, increases bacteria clearance and immune cell phagocytosis, and inhibits macrophage apoptosis in a lethal mouse CLP model.
Journal Title: The journal of trauma and acute care surgery
Volume: 78
Issue: 2
ISSN: 2163-0763; 2163-0755
Publisher: Unknown  
Journal Place: United States
Date Published: 2015
Start Page: 378
End Page: 385
Language: eng
Notes: LR: 20150315; GR: R01 GM084127/GM/NIGMS NIH HHS/United States; JID: 101570622; NIHMS645806; OID: NLM: NIHMS645806 [Available on 02/01/16]; OID: NLM: PMC4357277 [Available on 02/01/16]; PMCR: 2016/02/01 00:00; ppublish