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Modeling Spontaneous Metastatic Renal Cell Carcinoma (mRCC) in Mice Following Nephrectomy
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RKTG inhibits angiogenesis by suppressing MAPK-mediated autocrine VEGF signaling and is downregulated in clear-cell

Y Zhang1, X Jiang, X Qin

  • 1Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Shanghai, China.

Oncogene
|July 7, 2010
PubMed

Insights

Raf Kinase Trapping to Golgi (RKTG) inhibits endothelial cell proliferation and angiogenesis by suppressing the Raf/MEK/ERK pathway. RKTG downregulation correlates with clear-cell renal cell carcinoma (ccRCC) development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Vascular endothelial growth factors (VEGFs) are key regulators of blood vessel formation (angiogenesis and vasculogenesis).
  • Dysregulated angiogenesis is a hallmark of many cancers, including clear-cell renal cell carcinoma (ccRCC).
  • Anti-angiogenic therapies are crucial in cancer treatment.

Purpose of the Study:

  • To investigate the role of RKTG (Raf Kinase Trapping to Golgi) in angiogenesis and ccRCC.
  • To elucidate the molecular mechanisms by which RKTG regulates angiogenesis and VEGF signaling.

Main Methods:

  • In vitro and in vivo experiments were conducted.
  • Analysis of RKTG's effect on endothelial cell proliferation, migration, and sprouting.
  • Investigation of RKTG's impact on the Raf/MEK/ERK signaling pathway and hypoxia-inducible factor 1α (HIF-1α) activity.
  • Correlation analysis of RKTG and VEGF expression in clinical ccRCC samples.

Main Results:

  • RKTG negatively regulates endothelial cell proliferation, migration, sprouting, and angiogenesis.
  • RKTG suppresses mitogen-activated protein kinase (MAPK) signaling, inhibiting HIF-1α transactivation and VEGF transcription.
  • RKTG expression is downregulated in ccRCC tumors, inversely correlating with VEGF levels.

Conclusions:

  • RKTG acts as a negative regulator of angiogenesis by suppressing the Raf/MEK/ERK/HIF-1α/VEGF axis.
  • Downregulation of RKTG may contribute to ccRCC development by promoting angiogenesis.
  • RKTG represents a potential therapeutic target in ccRCC.

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