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Kisspeptin Inhibits Colorectal Cancer Cell Invasiveness by Activating PKR and PP2A

Jeong Nam Kim1, Tae Hun Kim2, Ji-Hye Yoon2

  • 1Department of Microbiology, College of Natural Sciences, Pusan National University, Pusan, Republic of Korea.

Anticancer Research
|October 3, 2018
PubMed
Abstract

Insights

Kisspeptin inhibits colorectal cancer metastasis by activating protein kinase R (PKR) and protein phosphatase 2A (PP2A). This pathway suppresses cancer cell invasion without affecting proliferation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Colorectal cancer (CRC) is a leading cause of cancer-related deaths worldwide.
  • Metastasis is a complex process involving cancer cell invasion and migration.
  • Understanding the molecular mechanisms regulating CRC metastasis is crucial for developing effective therapies.

Purpose of the Study:

  • To elucidate the mechanism by which kisspeptin inhibits colorectal cancer metastasis.
  • To investigate the role of kisspeptin receptor (KISS1R) in this process.
  • To determine the involvement of protein kinase R (PKR) and protein phosphatase 2A (PP2A) in kisspeptin's anti-metastatic effects.

Main Methods:

  • Colorectal cancer cells were treated with kisspeptin.
  • Assays were performed to evaluate cell viability, migration, invasion, and anchorage-independent growth.
  • Kisspeptin receptor (KISS1R) requirement was assessed using siRNA gene silencing.
  • Western blot analysis and invasion assays were conducted.
  • The regulation of PKR and PP2A by kisspeptin was examined using specific inhibitors.

Main Results:

  • Kisspeptin significantly inhibited colorectal cancer cell invasiveness.
  • Kisspeptin's effect was dependent on KISS1R activation.
  • Kisspeptin treatment led to the activation of both PKR and PP2A.
  • PKR activation was upstream of PP2A phosphorylation, as indicated by inhibitor studies.
  • Cell proliferation was not affected by kisspeptin treatment.

Conclusions:

  • Kisspeptin inhibits colorectal cancer cell invasiveness through the KISS1R-PKR-PP2A signaling pathway.
  • The PKR-PP2A axis plays a critical role in mediating kisspeptin's anti-metastatic effects in colorectal cancer.
  • Targeting this pathway may offer a novel therapeutic strategy for preventing colorectal cancer metastasis.
Keywords:
KISS1KISS1RKisspeptinPKRPP2Acolorectal cancer

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