Inhibition of histone deacetylase 6 restores intestinal tight junction in hemorrhagic shock

Zhigang Chang, Yongqing Li, Wei He, Baoling Liu, Xiuzhen Duan, Ihab Halaweish, Ted Bambakidis, Baihong Pan, Yingjian Liang, Vahagn C. Nikolian, Patrick Georgoff, Hasan B. Alam

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

BACKGROUND We recently discovered that Tubastatin-A, a histone deacetylase (HDAC6) inhibitor, can improve survival in a rodent model of hemorrhagic shock (HS), but mechanisms remain poorly defined. In this study, we investigated whether Tubastatin-A could protect intestinal tight junction (TJ) in HS. METHODS In an in-vivo study with Wistar-Kyoto rats, the rats underwent HS (40% blood loss) followed by Tubastatin-A (70 mg/kg) treatment, without fluid resuscitation. The experimental groups were (1) sham (no hemorrhage, no treatment), (2) control (hemorrhage, without treatment), and (3) treatment (hemorrhage with Tubastatin-A administration). Six hours after hemorrhage, ileum was harvested. Whole cell lysate were analyzed for acetylated α-tubulin (Ac-tubulin), total tubulin, acetylated histone 3 at lysine 9 (Ac-H3K9), β-actin, claudin-3 and zonula occludens 1 (ZO-1) proteins by Western blot. Histological effects of Tubastatin-A on small bowel were examined. In an in-vitro study, human intestinal epithelial cells (Caco-2) were divided into three groups: (1) sham (normoxia), (2) control (anoxia, no treatment), and (3) treatment (anoxia, treatment with Tubastatin-A). After 12 hours in an anoxia chamber, the cells were examined for Ac-tubulin and Ac-H3K9, cellular viability, cytotoxicity, claudin-3 and ZO-1 protein expression, and transwell permeability study. RESULTS Tubastatin-A treatment significantly attenuated HS-induced decreases of Ac-tubulin, Ac-H3K9, ZO-1 and claudin-3 proteins in small bowel in-vivo (p < 0.05). In cultured Caco-2 cells, anoxia significantly decreased cellular viability (p < 0.001) and increased cytotoxicity (p < 0.001) compared to the sham group, while Tubastatin-A treatment offered significant protection (p < 0.0001). Moreover, expression of claudin-3 was markedly decreased in vitro compared to the sham group, whereas this was significantly attenuated by Tubastatin-A (p < 0.05). Finally, anoxia markedly increased the permeability of Caco-2 monolayer cells (p < 0.05), while Tubastatin-A significantly attenuated the alteration (p < 0.05). CONCLUSION Inhibition of HDAC6 can induce Ac-tubulin and Ac-H3K9, promote cellular viability, and prevent the loss of intestinal tight junction proteins during HS and anoxia.

Original languageEnglish (US)
Pages (from-to)512-519
Number of pages8
JournalJournal of Trauma and Acute Care Surgery
Volume81
Issue number3
DOIs
StatePublished - Sep 1 2016
Externally publishedYes

Keywords

  • claudin-3
  • hemorrhagic shock
  • Intestine
  • tight junction
  • Tubastatin-A

ASJC Scopus subject areas

  • Surgery
  • Critical Care and Intensive Care Medicine

Fingerprint Dive into the research topics of 'Inhibition of histone deacetylase 6 restores intestinal tight junction in hemorrhagic shock'. Together they form a unique fingerprint.

Cite this