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Sci Rep. 2019 Oct 8;9(1):14413. doi: 10.1038/s41598-019-50957-9.

Tristetraprolin targets Nos2 expression in the colonic epithelium.

Author information

1
Department of Biochemistry & Molecular Biology, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA.
2
Department of Surgery, Division of Colon & Rectal Surgery, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA.
3
The Institute for Personalized Medicine, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA.
4
Department of Pharmacology, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA.
5
Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, NC, 27709, USA.
6
Departments of Medicine & Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA.
7
Department of Allergy & Sleep Medicine, Mount Nittany Medical Group, State College, PA, 16803, USA.
8
Department of Biochemistry & Molecular Biology, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA. gsy3@psu.edu.
9
Department of Surgery, Division of Colon & Rectal Surgery, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA. gsy3@psu.edu.

Abstract

Tristetraprolin (TTP), encoded by the Zfp36 gene, is a zinc-finger protein that regulates RNA stability primarily through association with 3' untranslated regions (3' UTRs) of target mRNAs. While TTP is expressed abundantly in the intestines, its function in intestinal epithelial cells (IECs) is unknown. Here we used a cre-lox system to remove Zfp36 in the mouse epithelium to uncover a role for TTP in IECs and to identify target genes in these cells. While TTP was largely dispensable for establishment and maintenance of the colonic epithelium, we found an expansion of the proliferative zone and an increase in goblet cell numbers in the colon crypts of Zfp36ΔIEC mice. Furthermore, through RNA-sequencing of transcripts isolated from the colons of Zfp36fl/fl and Zfp36ΔIEC mice, we found that expression of inducible nitric oxide synthase (iNos or Nos2) was elevated in TTP-knockout IECs. We demonstrate that TTP interacts with AU-rich elements in the Nos2 3' UTR and suppresses Nos2 expression. In comparison to control Zfp36fl/fl mice, Zfp36ΔIEC mice were less susceptible to dextran sodium sulfate (DSS)-induced acute colitis. Together, these results demonstrate that TTP in IECs targets Nos2 expression and aggravates acute colitis.

PMID:
31595002
DOI:
10.1038/s41598-019-50957-9
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