High levels of endogenous tumor necrosis factor-related apoptosis-inducing ligand expression correlate with increased cell death in human pancreas

Ahter Dilsad Sanlioglu, Ercument Dirice, Ozlem Elpek, Aylin Fidan Korcum, Mustafa Kemal Balci, Abdulkadir Omer, Thomas S. Griffith, Salih Sanlioglu

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

OBJECTIVES: Type 1 diabetes (T1D) has been characterized by the T cell-mediated destruction of pancreatic β cells. Although various members of the tumor necrosis factor (TNF) family, such as Fas ligand or TNF, have recently been implicated in the development of T1D, the lack of TNF-related apoptosis-inducing ligand (TRAIL) expression or function facilitates the onset of T1D. Thus, the goal of the present study was to investigate the expression profiles of TRAIL and its receptors in human pancreas. METHODS: Pancreata of 31 patients were analyzed by immunohistochemistry using antibodies developed against TRAIL and its receptors. Apoptosis was confirmed by Annexin V-fluorescein isothiocyanate binding and terminal deoxynucleotidyl transferase-mediated 2′-deoxyuridine 5′-triphosphate nick end labeling assays. RESULTS: Acinar cells displayed high levels of TRAIL and death receptor 4, but only low levels of death receptor 5. In contrast, only TRAIL and TRAIL decoy receptors (DcR1, DcR2) were detected in ductal cells. Similarly, Langerhans islets expressed only TRAIL and TRAIL decoy receptor. High levels of TRAIL expression in pancreas correlated with increased number of apoptotic cells. CONCLUSIONS: Although the expression of TRAIL decoy receptors might be necessary for defense from TRAIL-induced apoptosis, high levels of TRAIL may provide protection for Langerhans islets from the immunological attack of cytotoxic T cells.

Original languageEnglish (US)
Pages (from-to)385-393
Number of pages9
JournalPancreas
Volume36
Issue number4
DOIs
StatePublished - May 1 2008

Keywords

  • Death-decoy receptors
  • Langerhans islets
  • Pancreas
  • TRAIL

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