Cited by 414Thyroid Cancer Diagnosis and TreatmentThyroid and Parathyroid SurgeryThyroid Disorders and Treatments

Targeted expression of BRAFV600E in thyroid cells of transgenic mice results in papillary thyroid cancers that undergo dedifferentiation

Knauf, Jeffrey A., Ma, Xiaolan, Smith, Eric P., Zhang, Lei, Mitsutake, Norisato, Liao, Xiao-Hui, Refetoff, Samuel, Nikiforov, Yuri E. +1 more·2005·Cancer Research

Abstract

The BRAFT1799A mutation is the most common genetic alteration in papillary thyroid carcinomas (PTC). It is also found in a subset of papillary microcarcinomas, consistent with a role in tumor initiation. PTCs with BRAFT1799A are often invasive and present at a more advanced stage. BRAFT1799A is found with high prevalence in tall-cell variant PTCs and in poorly differentiated and undifferentiated carcinomas arising from PTCs. To explore the role of BRAFV600E in thyroid cancer pathogenesis, we targeted its expression to thyroid cells of transgenic FVB/N mice with a bovine thyroglobulin promoter. Two Tg-BRAFV600E lines (Tg-BRAF2 and Tg-BRAF3) were propagated for detailed analysis. Tg-BRAF2 and Tg-BRAF3 mice had increased thyroid-stimulating hormone levels (>7- and ∼2-fold, respectively). This likely resulted from decreased expression of thyroid peroxidase, sodium iodine symporter, and thyroglobulin. All lines seemed to successfully compensate for thyroid dysfunction, as serum thyroxine/triiodothyronine and somatic growth were normal. Thyroid glands of transgenic mice were markedly enlarged by 5 weeks of age. In Tg-BRAF2 mice, PTCs were present at 12 and 22 weeks in 14 of 15 and 13 of 14 animals, respectively, with 83% exhibiting tall-cell features, 83% areas of invasion, and 48% foci of poorly differentiated carcinoma. Tg-BRAF3 mice also developed PTCs, albeit with lower prevalence (3 of 12 and 4 of 9 at 12 and 22 weeks, respectively). Tg-BRAF2 mice had a 30% decrease in survival at 5 months. In summary, thyroid-specific expression of BRAFV600E induces goiter and invasive PTC, which transitions to poorly differentiated carcinomas. This closely recapitulates the phenotype of BRAF-positive PTCs in humans and supports a key role for this oncogene in its pathogenesis.

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Crossref · 10.1158/0008-5472.can-05-0047

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  • Dedifferentiation and development of radioactive iodine refractory diseases, resulting from decreased thyroid differentiation factors especially NIS, is a leading cause for BRAFV600E-related poor prognosis and mortality in thyroid tumorigenesis.

    “Dedifferentiation and development of radioactive iodine (RAI) refractory diseases, resulted from decreased thyroid differentiation factors, especially sodium iodide symporter (NIS), is also the leading cause for BRAFV600E-related poor prognosis and mortality in thyroid tumorigenesis28–30.”
  • Upregulation of pioneer developmental organizers such as SOX2, KLF4, β-catenin, SNAIL-1, c-MYC, TBX3, and BCL6 is reported downstream of BRAF/MAPK-driven tumor.

    “Even upregulation of pioneer developmental organizers, such as SOX2, KLF4, β-catenin, SNAIL-1, c-MYC, TBX3, BCL6, et al., are reported downstream of BRAF/MAPK-driven tumor, the pathways causing lineage reprogramming are not clear12,15,30–36.”
  • PTC patients with RET/PTC rearrangements or BRAFV600E mutation exhibit cell dedifferentiation.

    “PTC patients with RET/PTC rearrangements [30–32] or the BRAFV600E mutation [33, 34] exhibit cell dedifferentiation.”

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Authors
Knauf, J. A., Ma, X., Smith, E. P., Zhang, L., Mitsutake, N., Liao, X.-H., Refetoff, S., Nikiforov, Y. E., & Fagin, J. A.
Affiliations
  • 1Division of Endocrinology and
  • 3Medicine and
  • University of Chicago (US)
  • University of Cincinnati (US)
Venue
Cancer Research
Published
2005-05-15
Volume
65
Issue
10
Pages
4238-4245
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2166568854
Cited by
414
References
46
Citations by year
2026: 5 · 2025: 8 · 2024: 13 · 2023: 18 · 2022: 20 · 2021: 17 · 2020: 7 · 2019: 15 · 2018: 11 · 2017: 13 · 2016: 20 · 2015: 19 · 2014: 28 · 2013: 35 · 2012: 19
FWCI
17.18
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA 50706, R01CA050706)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
Keywords
BrafV600E, papillary thyroid carcinoma, transgenic mice, tall cell variant, poorly differentiated carcinoma, dedifferentiation, thyroid-stimulating hormone, thyroid dysfunction, goiter, tumor invasion, thyroid cancer pathogenesis
MeSH terms
Animals, Carcinoma, Papillary, Cell Differentiation, Female, Humans, Male, Mice, Transgenic, Mutation, Pregnancy, Thyroid Neoplasms, Blotting, Southern, Transgenes, MAP Kinase Signaling System, Proto-Oncogene Proteins B-raf, Mice

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