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Notch1 activation promotes renal cell carcinoma growth via PI3K/Akt signaling

Le Xu1, Yu Zhu, Jiejie Xu

  • 1Department of Urology, Zhongshan Hospital, Fudan University, Shanghai, China.

Cancer Science
|April 3, 2012
PubMed

Insights

Notch1 signaling activation promotes clear cell renal cell carcinoma (CCRCC) growth by influencing the PI3K/Akt pathway. This study establishes a key link between these pathways in CCRCC tumorigenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Clear cell renal cell carcinoma (CCRCC) exhibits aberrant activation of both Notch1 and PI3K/Akt signaling pathways.
  • These pathways are implicated in the complex mechanisms of CCRCC tumorigenesis.

Purpose of the Study:

  • To investigate the hypothesis that elevated Notch1 signaling activity promotes tumor growth in CCRCC by acting through the PI3K/Akt pathway.
  • To elucidate the functional relationship and collaboration between Notch1 and PI3K/Akt signaling in CCRCC progression.

Main Methods:

  • Manipulated Notch1 signaling activity in a CCRCC cell line and assessed downstream phosphorylated Akt (pAkt) levels.
  • Conducted cell proliferation, colony formation, and cell cycle analyses to evaluate tumor growth.
  • Utilized immunostaining of tissue microarrays to validate in vitro findings in vivo.

Main Results:

  • Notch1 signaling was found to be activated in CCRCC cell lines and tissue samples.
  • Notch1 activation significantly increased CCRCC cell proliferation, anchorage-independent growth, and accelerated G1/S cell cycle progression.
  • These Notch1-mediated effects were demonstrated to be at least partially dependent on the PI3K/Akt pathway.

Conclusions:

  • The study establishes a functional link between Notch1 and PI3K/Akt pathways in clear cell renal cell carcinoma.
  • Notch1 signaling plays a growth-promoting role in CCRCC, at least in part, through the PI3K/Akt pathway.
  • Correlations between Notch1, pAkt, and Ki-67 in patient samples support the in vitro findings and highlight therapeutic potential.

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