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Regulation of cell adhesion by PP2A and SV40 small tumor antigen: an important link to cell transformation

J-M Sontag1, E Sontag

  • 1Department of Pathology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9073, USA.

Cellular and Molecular Life Sciences : CMLS
|October 31, 2006
PubMed

Insights

Protein Phosphatase 2A (PP2A) enzymes are crucial for cell homeostasis and are implicated in cancer. This review explores how PP2A affects cell adhesion and cytoskeletal dynamics, contributing to cell transformation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Serine/threonine protein phosphatase 2A (PP2A) is a conserved enzyme family vital for cellular homeostasis.
  • PP2A is targeted by toxins like okadaic acid and viral proteins such as SV40 small t, known to induce cell transformation.
  • Altered PP2A expression or mutations are observed in various cancers, highlighting its role in tumorigenesis.

Purpose of the Study:

  • To review the role of PP2A enzymes in cell adhesion and cytoskeletal dynamics.
  • To elucidate the mechanisms by which PP2A affects cell polarity, motility, and invasiveness.
  • To examine the contribution of PP2A pathways to the transforming activity of SV40 small t.

Main Methods:

  • Literature review of studies on PP2A function.
  • Analysis of signaling pathways regulated by PP2A.
  • Investigation of PP2A's role in cell adhesion, cytoskeleton, and motility.

Main Results:

  • PP2A regulates key signaling pathways controlling cell growth and survival.
  • Disruption of PP2A-mediated cell adhesion and cytoskeletal dynamics leads to loss of polarity, increased motility, and invasiveness.
  • SV40 small t utilizes PP2A pathways to promote cell transformation.

Conclusions:

  • PP2A plays a significant role beyond cell growth regulation, impacting cell adhesion and cytoskeletal dynamics.
  • Dysregulation of PP2A contributes to cancer progression through altered cell motility and invasiveness.
  • Understanding PP2A's multifaceted roles is critical for cancer research and therapeutic strategies.

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