Ubc9 overexpression and SUMO1 deficiency blunt inflammation after intestinal ischemia/reperfusion.

Published

Journal Article

The intestinal epithelium constitutes a crucial defense to the potentially life-threatening effects of gut microbiota. However, due to a complex underlying vasculature, hypoperfusion and resultant tissue ischemia pose a particular risk to function and integrity of the epithelium. The small ubiquitin-like modifier (SUMO) conjugation pathway critically regulates adaptive responses to metabolic stress and is of particular significance in the gut, as inducible knockout of the SUMO-conjugating enzyme Ubc9 results in rapid intestinal epithelial disintegration. Here we analyzed the pattern of individual SUMO isoforms in intestinal epithelium and investigated their roles in intestinal ischemia/reperfusion (I/R) damage. Immunostaining revealed that epithelial SUMO2/3 expression was almost exclusively limited to crypt epithelial nuclei in unchallenged mice. However, intestinal I/R or overexpression of Ubc9 caused a remarkable enhancement of epithelial SUMO2/3 staining along the crypt-villus axis. Unexpectedly, a similar pattern was found in SUMO1 knockout mice. Ubc9 transgenic mice, but also SUMO1 knockout mice were protected from I/R injury as evidenced by better preserved barrier function and blunted inflammatory responses. PCR array analysis of microdissected villus-tip epithelia revealed a specific epithelial contribution to reduced inflammatory responses in Ubc9 transgenic mice, as key chemotactic signaling molecules such as IL17A were significantly downregulated. Together, our data indicate a critical role particularly of the SUMO2/3 isoforms in modulating responses to I/R and provide the first evidence that SUMO1 deletion activates a compensatory process that protects from ischemic damage.

Full Text

Duke Authors

Cited Authors

  • Karhausen, J; Bernstock, JD; Johnson, KR; Sheng, H; Ma, Q; Shen, Y; Yang, W; Hallenbeck, JM; Paschen, W

Published Date

  • June 2018

Published In

Volume / Issue

  • 98 / 6

Start / End Page

  • 799 - 813

PubMed ID

  • 29472640

Pubmed Central ID

  • 29472640

Electronic International Standard Serial Number (EISSN)

  • 1530-0307

Digital Object Identifier (DOI)

  • 10.1038/s41374-018-0035-6

Language

  • eng

Conference Location

  • United States