Role of tristetraprolin phosphorylation in paediatric patients with inflammatory bowel disease

Alessia Di Silvestre, Marianna Lucafò, Letizia Pugnetti, Matteo Bramuzzo, Gabriele Stocco, Egidio Barbi, Giuliana Decorti

Research output: Contribution to journalArticle

Abstract

BACKGROUND Intestinal inflammation and epithelial injury are the leading actors of inflammatory bowel disease (IBD), causing an excessive pro-inflammatory cytokines expression. Tristetraprolin (TTP), an mRNA binding protein, plays a role in regulating the inflammatory factors, recognizing specific sequences on the 3’ untranslated region of cytokine mRNAs. TTP activity depends on its phosphorylation state: the unphosphorylated TTP degrades pro-inflammatory cytokine mRNAs; on the contrary, the phosphorylated TTP fails to destabilize mRNAs furthering their expression. The phospho-TTP forms a complex with the chaperone protein 14-3-3. This binding could be one of the factors that promote intestinal inflammation as a cause of disease progression. AIM To assess if TTP phosphorylation has a role in paediatric IBD. METHODS The study was carried out on a cohort of paediatric IBD patients. For each patient enrolled, a specimen of inflamed and non-inflamed colonic mucosa was collected. Furthermore, the experiments were conducted on macrophages differentiated from blood samples of the same patients. Macrophages from healthy donors’ blood were used as controls. Co-immunoprecipitation assay and immunoblotting analyses were performed to observe the formation of the phospho-TTP/14-3-3 complex. In the same samples TNF-α expression was also evaluated as major factor of the pro-inflammatory activity. RESULTS In this work we studied indirectly the phosphorylation of TTP through the binding with the chaperone protein 14-3-3. In inflamed and non-inflamed colon mucosa of IBD paediatric patients immunoblot assay demonstrated a higher expression of the TTP in inflamed samples respect to the non-inflamed; the co-immunoprecipitated 14-3-3 protein showed the same trend of expression. In the TNF-α gene expression analysis higher levels of the cytokine in inflamed tissues compared to controls were evident. The same experiments were conducted on macrophages from IBD paediatric patients and healthy controls. The immunoblot results demonstrated a high expression of both TTP and co-immunoprecipitated 14-4-3 protein in IBD-derived macrophages in comparison to healthy donors. TNF-α protein levels from macrophages lysates showed the same trend of expression in favour of IBD paediatric patients compared to healthy controls. CONCLUSION In this work, for the first time, we describe a relation between phospho-TTP/14-3-3 complex and IBD. Indeed, a higher expression of TTP/14-3-3 was recorded in IBD samples in comparison to controls.

Original languageEnglish
Pages (from-to)5918-5925
Number of pages8
JournalWorld Journal of Gastroenterology
Volume25
Issue number39
DOIs
Publication statusPublished - Oct 21 2019

Keywords

  • 14-3-3 protein
  • Cytokines
  • Inflammation
  • Inflammatory bowel disease
  • Phosphorylation
  • Tristetraprolin

ASJC Scopus subject areas

  • Gastroenterology

Fingerprint Dive into the research topics of 'Role of tristetraprolin phosphorylation in paediatric patients with inflammatory bowel disease'. Together they form a unique fingerprint.

  • Cite this