Pregnancy specific β-1 glycoprotein 1 is expressed in pancreatic ductal adenocarcinoma and its subcellular localization correlates with overall survival

Jasmin H. Shahinian, Hannah Fuellgraf, Stefan Tholen, Justin Mastroianni, Julia Daniela Knopf, Markus Kuehs, Bettina Mayer, Manuel Schlimpert, Birte Kulemann, Simon Kuesters, Jens Hoeppner, Ulrich F. Wellner, Martin Werner, Ulrich T. Hopt, Robert Zeiser, Peter Bronsert, Oliver Schilling*

*Corresponding author for this work

Abstract

Proteins of the pregnancy specific β-1 glycoprotein (PSG) family are renowned for their elevated expression during pregnancy. Only few reports have investigated their expression in adenocarcinomas. We studied the expression of PSG1 in pancreatic adenocarcinoma (PDAC). In a cohort of 104 patient samples, immunohistochemical analysis determined PSG1 expression in every specimen. PSG1 was found at apical and cytoplasmic localization or solely at cytoplasmic localization, with the latter case being correlated to shortened median survival (25 vs 11 months, logrank p-value < 0.001). At the same time, enzyme linked immunosorbent assay (ELISA) did not detect elevated PSG1 levels in the plasma of PDAC patients as opposed to the plasma of healthy, non-pregnant control individuals. We also probed the impact of PSG1 expression in a murine tumor model system, using subcutaneous injection of Colo-26 cells into immunocompetent BALB/c mice. Here, tumor growth was not affected by the expression of human PSG1. Our study reaffirms interest into the tumor-contextual biology of PSG proteins.

Original languageEnglish
JournalJournal of Cancer
Volume7
Issue number14
Pages (from-to)2018-2027
Number of pages10
ISSN0007-0920
DOIs
Publication statusPublished - 01.01.2016

Research Areas and Centers

  • Research Area: Luebeck Integrated Oncology Network (LION)

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