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Monitoring Kinase and Phosphatase Activities Through the Cell Cycle by Ratiometric FRET
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Published on: January 27, 2012

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Regulation of RhoA activation and cell motility by c-Jun N-terminal kinases and Net1

Arzu Ulu1, Jeffrey A Frost1

  • 1Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston , Houston, TX, USA.

Small Gtpases
|October 19, 2018
PubMed

Insights

JNK signaling regulates cancer cell motility by controlling Net1A localization. This pathway promotes RhoA activation, driving invasion and metastasis in breast cancer.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Signal Transduction

Background:

  • JNKs (c-Jun N-terminal kinases) are crucial for transcription and apoptosis.
  • JNKs also regulate cell motility and invasion by phosphorylating cytoskeletal proteins.
  • Rho GTPases are key regulators of cell motility, often activated upstream of JNKs.

Purpose of the Study:

  • To investigate the role of JNKs in regulating Rho GTPase activation.
  • To elucidate the mechanism by which JNKs influence cell motility and invasion.
  • To identify novel regulatory pathways contributing to cancer metastasis.

Main Methods:

  • Investigated JNK-dependent phosphorylation of Net1A, a RhoA guanine nucleotide exchange factor (RhoGEF).
  • Assessed the effect of Net1A cytosolic accumulation on RhoA activation and actin cytoskeleton.
  • Utilized non-invasive breast cancer cells to evaluate JNK-stimulated Net1A localization and its impact on motility and invasion.

Main Results:

  • JNK-dependent phosphorylation of Net1A promotes its translocation from the nucleus to the cytosol.
  • Cytosolic Net1A activates RhoA, leading to actin cytoskeletal reorganization.
  • JNK-induced Net1A localization enhances cell motility and extracellular matrix invasion in breast cancer cells.
  • Net1A expression is critical for both in vitro invasion and in vivo metastasis.

Conclusions:

  • JNK signaling directly regulates RhoA activation through Net1A phosphorylation and subsequent cytosolic accumulation.
  • This novel mechanism provides a link between JNK signaling and cancer cell motility and invasion.
  • Targeting the JNK-Net1A pathway may offer new strategies to inhibit breast cancer metastasis.
Keywords:
JnkNet1RhoAactin cytoskeletoninvasionmotility

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