Digestive Diseases and Sciences

, Volume 48, Issue 4, pp 717–725 | Cite as

Up-Regulation of p75 Neurotrophin Receptor (p75NTR) Is Associated with Apoptosis in Chronic Pancreatitis

  • Zhaowen Zhu
  • Helmut Friess
  • Xin Shi
  • Li Wang
  • Francesco F. Di Mola
  • Martin Wirtz
  • Mark Hartel
  • Markus Wagner
  • Arthur Zimmermann
  • Michael Müller
  • Markus W. Büchler
Article

Abstract

Activation of apoptosis in chronic pancreatitis has been demonstrated. The low-affinity neurotrophin receptor p75 (p75NTR) mediates apoptosis in many cell types in vivo and in vitro. The aim of this study was to examine whether p75NTR is involved in the apoptotic process in chronic pancreatitis. The quantity and localization of the receptor was evaluated using northern blot analysis, in situ hybridization, immunohistochemistry, and western blot analysis. Apoptosis was determined by TUNEL assay. By northern blot analysis, p75NTR mRNA levels were increased 40-fold in chronic pancreatitis compared with normal pancreas (P < 0.01). in situ hybridization revealed weak p75NTR mRNA expression in some ductal cells in the normal pancreas. In contrast in chronic pancreatitis moderate p75NTR expression was present in acinar cells next to fibrosis, ductal cells, and cells of ductular structures as well as in some islet cells. Immunostaining of p75NTR in normal pancreas and chronic pancreatitis tissue samples showed a similar intensity and distribution pattern as found by in situ hybridization. Higher p75NTR protein levels could be confirmed by western blot analysis, which revealed an 8.6-fold increase of p75NTR in chronic pancreatitis. TUNEL staining showed, in chronic pancreatitis samples, positivity in some acinar cells next to fibrosis, some ductal cells, and cells of ductular structures. Also some islet cells were positive by TUNEL staining. The presence of p75NTR immunoreactivity was positively correlated (P < 0.05) with the apoptotic index in the exocrine and endocrine pancreas. In conclusion, p75NTR, the low-affinity receptor of neurotrophins which mediates apoptosis, is up-regulated in CP and is involved in the apoptotic process of the exocrine and endocrine pancreas.

p75NTR chronic pancreatitis apoptosis TUNEL assay 

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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Zhaowen Zhu
    • 1
  • Helmut Friess
    • 1
  • Xin Shi
    • 1
  • Li Wang
    • 1
  • Francesco F. Di Mola
    • 1
  • Martin Wirtz
    • 1
  • Mark Hartel
    • 1
  • Markus Wagner
    • 2
  • Arthur Zimmermann
    • 3
  • Michael Müller
    • 1
  • Markus W. Büchler
    • 1
  1. 1.Department of General SurgeryUniversity of HeidelbergHeidelbergGermany
  2. 2.Department of Visceral and Transplantation SurgeryUniversity of BernBernSwitzerland
  3. 3.Institute of PathologyUniversity of BernBernSwitzerland

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