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Critical interactions between TGF-β signaling/ELF, and E-cadherin/β-catenin mediated tumor suppression

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Abstract

Inactivation of the transforming growth factor-β (TGF-β) pathway occurs often in malignancies of the gastrointestinal (GI) system. However, only a fraction of sporadic GI tumors exhibit inactivating mutations in early stages of cancer formation, suggesting that other mechanisms play a critical role in the inactivation of this pathway. Here, we show a wide range of GI tumors, including those of the stomach, liver and colon in elf+/− and elf+/−/Smad4+/− mutant mice. We found that embryonic liver fodrin (ELF), a β-Spectrin originally identified in endodermal stem/progenitor cells committed to foregut lineage, possesses potent antioncogenic activity and is frequently inactivated in GI cancers. Specifically, E-cadherin accumulation at cell–cell contacts and E-cadherin-β-catenin-dependent epithelial cell–cell adhesion is disrupted in elf+/−/Smad4+/− mutant gastric epithelial cells, and could be rescued by ectopic expression of full-length elf, but not Smad3 or Smad4. Subcellular fractionation revealed that E-cadherin is expressed mainly at the cell membrane after TGF-β stimulation. In contrast, elf+/−/Smad4+/− mutant tissues showed abnormal distribution of E-cadherin that could be rescued by overexpression of ELF but not Smad3 or Smad4. Our results identify a group of common lethal malignancies in which inactivation of TGF-β signaling, which is essential for tumor suppression, is disrupted by inactivation of the ELF adaptor protein.

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Abbreviations

ELF:

embryonic liver fodrin

TGF-β:

transforming growth factor-β

TβRII:

transforming growth factor-β receptor II

TβRI:

transforming growth factor-β receptor I

MEFs:

mouse embryonic fibroblasts

HNPCC:

hereditary nonpolyposis colorectal cancer

BrdU:

5-bromo-2′-deoxyuridine

TUNEL:

TdT-mediated dUTP-biotin nick-end labeling

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Acknowledgements

We thank Dr M Zasloff, Dr R Schlegel and Dr S Baker for critical review of the manuscript, and Dr Eugene A Volpe and Anan H Said for their technical support.

This work was supported by NIH Grants RO1 CA106614A (LM), RO1 DK56111 (LM), RO1 DK58637 (BM), VA Merit Award (LM) and R Robert and Sally D Funderburg Research Scholar (LM).

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Katuri, V., Tang, Y., Li, C. et al. Critical interactions between TGF-β signaling/ELF, and E-cadherin/β-catenin mediated tumor suppression. Oncogene 25, 1871–1886 (2006). https://doi.org/10.1038/sj.onc.1209211

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