Forkheadbox Proteins as Novel Drug Targets in Gastroenteropancreatic Neuroendocrine Tumor Disease: Inhibition of FoxM1 Exerts Antiproliferative Effects in GEP-NEN Cell Lines Abstract #1001

Introduction: Forkheadbox proteins (Fox proteins) are transcriptions factors. They are highly conserved key players in a large number of cellular processes. Fox proteins have been described as acting as both tumor suppressors and oncogenes. Most notably, they operate in the context of the majority of cancer-related pathways. Information about the fuunction of these proteins in gastroenteropancreatic neuroendocrine neoplasias is scant.
Aim(s): Therefore, we assessed FoxM1 expression in a series of GEP-NENs and studied the effects of FoxM1 inhibition in human GEP-NEN cell lines.
Materials and methods: Tumor specimens from 206 patients (61 G1, 105 G2, 40 G3 tumors) from two institutions (Charité-CBF; FSU Jena) were studied immunohistochemically for FoxM1 expression. The cell lines BON, QGP-1, KRJ-1 and LCC18 were treated with Siomycin A, a specific FoxM1 inhibitor, and FoxM1 specific siRNA. Treated cells were analyzed by proliferation assays and western blot. Microarrays with treated v. untreated cells are planned further on.
Conference: 11th Annual ENETS Conference (2014)
Category: Basic Science - mTOR and other pathways, signalling, receptors
Presenting Author: PD Dr. Patricia Grabowski

To read results and conclusion, please login ...

Further abstracts you may be interested in

#1003 Signalling Pathways in Bronchial Neuroendocrine Tumor Disease and Its Translation to Innovative Targets: The New Kid on the Block
Introduction: Bronchial neuroendocrine neoplasias comprise a wide spectrum of well-differentiated tumors (typical/atypical carcinoids) to undifferentiated carcinomas such as small (SCLC) and large cell (LC) neuroendocrine carcinomas with a fatal prognosis. Therapeutic options are unsatisfactory.
Conference: 11th Annual ENETS Conference (2014)
Category: Basic Science - mTOR and other pathways, signalling, receptors
Presenting Author: PD Dr. Patricia Grabowski
#246 SDHB Loss Predicts Malignancy in Pheochromocytomas/Sympathethic Paragangliomas, but Not Through Hypoxia Signalling
Introduction: To date there is no reliable histopathological marker of malignancy for pheochromocytomas/sympathetic paragangliomas (PCC/PGL). It is well-known that PCC/PGL in the hereditary context of an SDHB germline mutation very often metastasize. The immunohistochemical loss of SDHB expression was recently shown to be a surrogate marker for the presence of an SDH germline mutation in PCC/PGL. SDHB loss is supposed to be tumorigenic via activation of hypoxia signals.
Conference: 8th Annual ENETS Conference (2011)
Category: Basic
Presenting Author: Dr Anja M Schmitt
#174 Loss of Expression of the DNA Mismatch Repair Proteins MLH1 and MSH2 is Rare in Pancreatic and Small Intestinal Neuroendocrine Tumors
Introduction: Loss of expression of the DNA mismatch repair (MMR) proteins MLH1 and MSH2, which is known to correlate strongly with MSI, has not been well studied in pancreatic or small intestinal NETs.
Conference: 8th Annual ENETS Conference (2011)
Category: Basic
Presenting Author: Dr Daniel Rayson
Authors: Rayson D, Arnason T, Sapp H, Barnes P, ...
#198 Novel Insights in Octreotide Effects on Human Neuroendocrine Cell Line CNDT2.5
Introduction: Octreotide, the first synthetic somatostatin analog available for clinical use, efficiently binds somatostatin receptors (SSRs) 2 and 5 and may transduce its effects by using SSRs.
Conference: 8th Annual ENETS Conference (2011)
Category: Basic
Presenting Author: Su-Chen Li
Authors: Li S C, Cui T, Martijn C, Öberg K, ...
#422 The Somatostatin Analogue Octreotide Inhibits Growth of Neuroendocrine Tumor Cells by Triggering Janus Faced Proteins
Introduction: Octreotide is a somatostatin analogue, which improves the management of neuroendocrine tumor (NET) patients. Octreotide acts through somatostatin receptors (SSTRs). However, the molecular mechanisms leading to successful therapy or curative effects are largely unknown, particularly when SSTRs levels are low or absent.
Conference: 9th Annual ENETS Conference (2012)
Category: Basic
Presenting Author: Su-Chen Li
Authors: Li S C, Martijn C, Cui T, Essaghir A, ...