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  Elimination of B-RAF in Oncogenic C-RAF-expressing Alveolar Epithelial Type II Cells Reduces MAPK Signal Intensity and Lung Tumor Growth

Zanucco, E., El-Nikhely, N., Goetz, R., Weidmann, K., Pfeiffer, V., Savai, R., et al. (2014). Elimination of B-RAF in Oncogenic C-RAF-expressing Alveolar Epithelial Type II Cells Reduces MAPK Signal Intensity and Lung Tumor Growth. JOURNAL OF BIOLOGICAL CHEMISTRY, 289(39), 26804-26816. doi:10.1074/jbc.M114.558999.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-39EE-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-39EF-8
Genre: Journal Article

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 Creators:
Zanucco, Emanuele1, Author              
El-Nikhely, Nefertiti2, Author
Goetz, Rudolf2, Author
Weidmann, Katharina2, Author
Pfeiffer, Verena2, Author
Savai, Rajkumar2, Author
Seeger, Werner2, Author
Ullrich, Axel1, Author              
Rapp, Ulf R.3, Author              
Affiliations:
1Ullrich, Axel / Molecular Biology, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565172              
2external, ou_persistent22              
3Former Research Groups, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565145              

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Free keywords: WILD-TYPE; CANCER; BRAF; HETERODIMERIZATION; PROGRESSION; PATHWAY; KINASE; ACTIVATE; MELANOMA; TARGETS
 Abstract: Tumors are often greatly dependent on signaling cascades promoting cell growth or survival and may become hypersensitive to inactivation of key components within these signaling pathways. Ras and RAF mutations found in human cancer confer constitutive activity to these signaling molecules thereby converting them into an oncogenic state. RAF dimerization is required for normal Ras-dependent RAF activation and is required for the oncogenic potential of mutant RAFs. Here we describe a new mouse model for lung tumor development to investigate the role of B-RAF in oncogenic C-RAF-mediated adenoma initiation and growth. Conditional elimination of B-RAF in C-RAF BxB-expressing embryonic alveolar epithelial type II cells did not block adenoma formation. However, loss of B-RAF led to significantly reduced tumor growth. The diminished tumor growth upon B-RAF inactivation was due to reduced cell proliferation in absence of senescence and increased apoptosis. Furthermore, B-RAF elimination inhibited C-RAF BxB-mediated activation of the mitogenic cascade. In line with these data, mutation of Ser-621 in C-RAF BxB abrogated in vitro the dimerization with B-RAF and blocked the ability to activate the MAPK cascade. Taken together these data indicate that B-RAF is an important factor in oncogenic C-RAF-mediated tumorigenesis.

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Language(s): eng - English
 Dates: 2014
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000342853900013
DOI: 10.1074/jbc.M114.558999
 Degree: -

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Title: JOURNAL OF BIOLOGICAL CHEMISTRY
Source Genre: Journal
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Publ. Info: 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA : AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Pages: - Volume / Issue: 289 (39) Sequence Number: - Start / End Page: 26804 - 26816 Identifier: ISSN: 0021-9258