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Pro-invasive Snail1 targets TGFbeta receptor I to promote epithelial to mesenchymal transition in prostate cancer
Umeå University, Faculty of Medicine, Department of Medical Biosciences. (Landstrom group)
Umeå University, Faculty of Medicine, Department of Medical Biosciences. (Landstrom group)
Ludwig Institute for Cancer Research, Uppsala.
Umeå University, Faculty of Medicine, Department of Medical Biosciences.
(English)Manuscript (preprint) (Other academic)
Keyword [en]
Snail1
National Category
Cell and Molecular Biology
Research subject
Oncology
Identifiers
URN: urn:nbn:se:umu:diva-108012OAI: oai:DiVA.org:umu-108012DiVA: diva2:850268
Funder
Swedish Research CouncilSwedish Cancer SocietyKnut and Alice Wallenberg Foundation
Available from: 2015-09-01 Created: 2015-09-01 Last updated: 2015-09-03Bibliographically approved
In thesis
1. TRAF6, a key regulator of TGFβ-induced oncogenesis in prostate cancer
Open this publication in new window or tab >>TRAF6, a key regulator of TGFβ-induced oncogenesis in prostate cancer
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Prostate cancer is the most common cancer in men, with the incidence rapidly increasing in Europe over the past two decades. Reliable biomarkers for prostate cancer are currently unavailable. Thus, there is an urgent need for improved biomarkers to diagnose prostate cancer at an early stage and to determine the best treatment options. Higher expression of transforming growth factor-β (TGFβ) has been reported in patients with aggressive cancer.

TGFβ is a multifunctional cytokine that acts as a tumor suppressor during early tumor development, and as a tumor promoter at later stages of cancer. TGFβ signals through the canonical Smad or non-Smad cascade via TGFβ type II and type I receptors. The TGFβ signaling cascade is regulated by various post-translational modifications of its key components. The present investigation aimed to identify a potential function of TRAF6 in TGFβ-induced responses in prostate cancer.

The first two articles of this thesis unveil the proteolytic cleavage of TGFβ type I receptor (TβRI), and the biological importance of the liberated TβRI intracellular domain (TβRI-ICD) in the nucleus. We found that tumor necrosis factor receptor-associated factor 6 (TRAF6) polyubiquitinates TβRI, which leads to cleavage of TβRI by tumor necrosis factor alpha converting enzyme (TACE) in a protein kinase C zeta (PKCζ)-dependent manner. Following ectodomain shedding, TβRI undergoes a second cleavage by presenilin 1 (PS1), which liberates TβRI-ICD. TβRI-ICD translocates to the nucleus, where it regulates its own expression as well as expression of the pro-invasive gene Snail1, thereby promoting invasion. We further found that TβRI-ICD associates with Notch intracellular domain (NICD) to drive expression of the pro-invasive gene Snail1, as well as Notch1 ligand Jag1.

The third article provides evidence that TRAF6 promotes Lys63-linked polyubiquitination of TβRI at Lys178 in a TGFβ-dependent manner. TβRI polyubiquitination was found to be a prerequisite for TβRI nuclear translocation, and thus for regulation of the genes involved in cell cycle, differentiation, and invasion of prostate cancer cells.

In the fourth article we investigated the role of the pro-invasive gene Snail1 in TGFβ-induced epithelial-to-mesenchymal transition (EMT) in prostate cancer cells.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2015. 55 p.
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 1739
Keyword
TβRI, TGFβ, TACE, TRAF6, PS1, PKCζ, TβRI-ICD, NICD, Smad, non-Smad, prostate cancer, Snail1, MMP, p300, p21, PAI1, ubiquitination, cleavage, ICD, invasion, HES1, signaling
National Category
Cell and Molecular Biology
Research subject
Pathology
Identifiers
urn:nbn:se:umu:diva-108014 (URN)978-91-7601-315-1 (ISBN)
Public defence
2015-09-25, Hörsal Betula, Norrlands Universitetssjukhus, Umeå, 09:00 (English)
Opponent
Supervisors
Funder
Swedish Cancer SocietyThe Kempe FoundationsKnut and Alice Wallenberg Foundation
Available from: 2015-09-04 Created: 2015-09-01 Last updated: 2015-09-03Bibliographically approved

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