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Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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Actin depolymerization mediated loss of SNTA1 phosphorylation and Rac1 activity has implications on ROS production,

Sehar Saleem Bhat1, Arif Ali Parray1, Umar Mushtaq1

  • 1Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India.

Apoptosis : an International Journal on Programmed Cell Death
|April 7, 2016
PubMed

Insights

Actin cytoskeleton dynamics influence Alpha-1-syntrophin (SNTA1) and Rac1 signaling. Disrupting actin via depolymerization reduces SNTA1 phosphorylation, Rac1 activity, cell migration, and reactive oxygen species (ROS), while increasing apoptosis in breast cancer cells.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Alpha-1-syntrophin (SNTA1) and Rac1 are over-expressed in carcinomas and involved in cell signaling via the dystrophin glycoprotein complex (DGC).
  • SNTA1 links the extracellular matrix to intracellular signaling and the actin cytoskeleton, modulating actin organization.
  • Rac1 also plays a critical role in regulating the actin cytoskeleton.

Purpose of the Study:

  • To investigate the interplay between filamentous actin (f-actin), SNTA1, and Rac1.
  • To analyze the effects of actin depolymerization on SNTA1 tyrosine phosphorylation and Rac1 activity.

Main Methods:

  • Utilized actin depolymerizing drugs, cytochalasin D and latrunculin A, to disrupt the actin cytoskeleton.
  • Assessed SNTA1 tyrosine phosphorylation and Rac1 activity in breast carcinoma cells.

Main Results:

  • Actin depolymerization significantly decreased SNTA1 tyrosine phosphorylation.
  • Loss of SNTA1 phosphorylation led to reduced interaction with Rac1 and decreased Rac1 activation.
  • Actin depolymerization resulted in increased apoptosis, decreased cell migration, and reduced reactive oxygen species (ROS) levels.

Conclusions:

  • f-actin plays a crucial role in the SNTA1-Rac1 signaling pathway.
  • Actin depolymerization impacts breast carcinoma cell behavior, including migration, ROS production, and apoptosis.
Keywords:
ActinAlpha-1-syntrophinApoptosisBreast cancerROSRac1

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