CUX1: a modulator of tumour aggressiveness in pancreatic neuroendocrine neoplasms.

Abstract:

:Pancreatic neuroendocrine neoplasms (PNENs) constitute a rare tumour entity, and prognosis and treatment options depend on tumour-mediating hallmarks such as angiogenesis, proliferation rate and resistance to apoptosis. The molecular pathways that determine the malignant phenotype are still insufficiently understood and this has limited the use of effective combination therapies in the past. In this study, we aimed to characterise the effect of the oncogenic transcription factor Cut homeobox 1 (CUX1) on proliferation, resistance to apoptosis and angiogenesis in murine and human PNENs. The expression and function of CUX1 were analysed using knockdown and overexpression strategies in Ins-1 and Bon-1 cells, xenograft models and a genetically engineered mouse model of insulinoma (RIP1Tag2). Regulation of angiogenesis was assessed using RNA profiling and functional tube-formation assays in HMEC-1 cells. Finally, CUX1 expression was assessed in a tissue microarray of 59 human insulinomas and correlated with clinicopathological data. CUX1 expression was upregulated during tumour progression in a time- and stage-dependent manner in the RIP1Tag2 model, and associated with pro-invasive and metastatic features of human insulinomas. Endogenous and recombinant CUX1 expression increased tumour cell proliferation, tumour growth, resistance to apoptosis, and angiogenesis in vitro and in vivo. Mechanistically, the pro-angiogenic effect of CUX1 was mediated via upregulation of effectors such as HIF1α and MMP9. CUX1 mediates an invasive pro-angiogenic phenotype and is associated with malignant behaviour in human insulinomas.

journal_name

Endocr Relat Cancer

journal_title

Endocrine-related cancer

authors

Krug S,Kühnemuth B,Griesmann H,Neesse A,Mühlberg L,Boch M,Kortenhaus J,Fendrich V,Wiese D,Sipos B,Friemel J,Gress TM,Michl P

doi

10.1530/ERC-14-0152

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

879-90

issue

6

eissn

1351-0088

issn

1479-6821

pii

ERC-14-0152

journal_volume

21

pub_type

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