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Nuclear factor-kappaB is constitutively active in C-cell carcinoma and required for RET-induced transformation

L Ludwig1, H Kessler, M Wagner

  • 1Department of Internal Medicine I, University of Ulm, Robert-Koch-Street 8, D-89081 Ulm, Germany.

Cancer Research
|June 5, 2001
PubMed

Insights

RET proto-oncogene mutations activate nuclear factor-kappaB (NF-kappaB) in medullary thyroid carcinoma (MTC). This NF-kappaB activation is crucial for RET-driven cancer development and cell survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Specific RET proto-oncogene mutations are linked to Multiple Endocrine Neoplasia (MEN) types 2A and 2B, familial medullary thyroid carcinoma (MTC), and sporadic MTC.
  • Nuclear factor-kappaB (NF-kappaB) signaling is implicated in various cancers.

Purpose of the Study:

  • To investigate the role of NF-kappaB activation in RET-associated C-cell carcinoma.
  • To determine the mechanisms by which RET mutations activate NF-kappaB.
  • To assess the therapeutic potential of inhibiting NF-kappaB in MTC.

Main Methods:

  • Analysis of NF-kappaB activation in MTC specimens and cell lines (TT cells).
  • Transient transfection assays in HeLa cells to assess RET mutant-induced NF-kappaB activation.
  • Investigating the involvement of specific kinases (IKKalpha, IKKbeta, Ras, Raf, MEKK1, MAPK/ERK, PI3K/Akt) in RET-mediated NF-kappaB activation.
  • Assessing the effect of NF-kappaB inhibition on MTC cell viability and focus formation.

Main Results:

  • NF-kappaB is constitutively activated in RET-associated C-cell carcinoma specimens and TT cells.
  • RET mutations (C634R and M918T) activate NF-kappaB-dependent reporter constructs.
  • RET-induced NF-kappaB activation is dependent on IKKbeta, Ras, Raf, and MEKK1, but not MAPK/ERK or PI3K/Akt pathways.
  • Inhibition of NF-kappaB leads to cell death in TT cells and blocks focus formation in NIH 3T3 cells.

Conclusions:

  • Constitutive NF-kappaB activation is a key feature of RET-associated MTC.
  • RET mutations drive MTC pathogenesis through IKK/NF-kappaB signaling.
  • Targeting the IKK/NF-kappaB pathway represents a potential therapeutic strategy for MTC.

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