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Testes-specific protease 50 promotes cell proliferation via inhibiting activin signaling

Z-B Song1,2, P Wu1, J-S Ni3

  • 1National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, China.

Oncogene
|June 27, 2017
PubMed

Insights

Testes-specific protease 50 (TSP50) oncogene promotes breast cancer by inhibiting activin signaling. TSP50 overexpression reduces p27 levels, driving cell proliferation and tumor growth, offering a new therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Testes-specific protease 50 (TSP50) is a newly identified oncogene.
  • TSP50 is known to promote cell proliferation, invasion, and tumor growth.
  • TSP50 overexpression suppresses activin signaling, suggesting its involvement in proliferation.

Purpose of the Study:

  • To investigate the inhibitory effect of TSP50 on activin signaling.
  • To elucidate the molecular mechanisms by which TSP50 influences cell proliferation.
  • To explore the therapeutic potential of targeting TSP50 in breast cancer.

Main Methods:

  • Investigated TSP50 interaction with ActRIIA and ActRIB phosphorylation.
  • Analyzed Smad2/3 nuclear accumulation and p27 expression.
  • Utilized immunohistochemistry on human breast cancer specimens.
  • Correlated TSP50 expression with clinical indicators (tumor size, grade, ER, PR, HER-2).

Main Results:

  • TSP50 interacts with ActRIIA, inhibiting ActRIB phosphorylation and Smad2/3 nuclear accumulation.
  • TSP50 reduces p27 expression, promoting cell proliferation and tumor growth.
  • Activation of ActRIB reverses TSP50-mediated proliferation and tumor growth.
  • TSP50 expression inversely correlates with p-Smad2/3 and p27 levels in breast cancer.
  • TSP50/p-Smad2/3 and TSP50/p27 expression correlates with breast cancer diagnostic indicators.

Conclusions:

  • TSP50 inhibits activin signaling, leading to reduced p27 expression and promoting cell proliferation.
  • TSP50 plays a significant role in breast cancer progression.
  • Targeting TSP50 or its downstream effectors presents a promising therapeutic strategy for breast cancer.

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